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-rw-r--r--netwerk/srtp/src/include/config.h6
-rw-r--r--netwerk/srtp/src/include/ekt.h201
-rw-r--r--netwerk/srtp/src/include/getopt_s.h60
-rw-r--r--netwerk/srtp/src/include/rtp.h139
-rw-r--r--netwerk/srtp/src/include/rtp_priv.h74
-rw-r--r--netwerk/srtp/src/include/srtp.h1006
-rw-r--r--netwerk/srtp/src/include/srtp_priv.h256
-rw-r--r--netwerk/srtp/src/include/ut_sim.h80
8 files changed, 1822 insertions, 0 deletions
diff --git a/netwerk/srtp/src/include/config.h b/netwerk/srtp/src/include/config.h
new file mode 100644
index 000000000..75e05e897
--- /dev/null
+++ b/netwerk/srtp/src/include/config.h
@@ -0,0 +1,6 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+/* empty file; config done via Makefile.in & configure.in */
diff --git a/netwerk/srtp/src/include/ekt.h b/netwerk/srtp/src/include/ekt.h
new file mode 100644
index 000000000..b0d888bac
--- /dev/null
+++ b/netwerk/srtp/src/include/ekt.h
@@ -0,0 +1,201 @@
+/*
+ * ekt.h
+ *
+ * interface to Encrypted Key Transport for SRTP
+ *
+ * David McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright (c) 2001-2005 Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+
+/*
+ * EKT implementation strategy
+ *
+ * use stream_template approach
+ *
+ * in srtp_unprotect, when a new stream appears, check if template has
+ * EKT defined, and if it does, then apply EKT processing
+ *
+ * question: will we want to allow key-sharing templates in addition
+ * to EKT templates? could define a new ssrc_type_t that's associated
+ * with an EKT, e.g. ssrc_any_ekt.
+ *
+ *
+ */
+
+#ifndef EKT_H
+#define EKT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "srtp_priv.h"
+
+#define EKT_CIPHER_DEFAULT 1
+#define EKT_CIPHER_AES_128_ECB 1
+#define EKT_CIPHER_AES_192_KEY_WRAP 2
+#define EKT_CIPHER_AES_256_KEY_WRAP 3
+
+typedef uint16_t ekt_spi_t;
+
+
+unsigned
+ekt_octets_after_base_tag(ekt_stream_t ekt);
+
+/*
+ * an srtp_policy_t structure can contain a pointer to an
+ * ekt_policy_t structure
+ *
+ * this structure holds all of the high level EKT information, and it
+ * is passed into libsrtp to indicate what policy should be in effect
+ */
+
+typedef struct ekt_policy_ctx_t {
+ ekt_spi_t spi; /* security parameter index */
+ uint8_t ekt_cipher_type;
+ uint8_t *ekt_key;
+ struct ekt_policy_ctx_t *next_ekt_policy;
+} ekt_policy_ctx_t;
+
+
+/*
+ * an ekt_data_t structure holds the data corresponding to an ekt key,
+ * spi, and so on
+ */
+
+typedef struct ekt_data_t {
+ ekt_spi_t spi;
+ uint8_t ekt_cipher_type;
+ aes_expanded_key_t ekt_enc_key;
+ aes_expanded_key_t ekt_dec_key;
+ struct ekt_data_t *next_ekt_data;
+} ekt_data_t;
+
+/*
+ * an srtp_stream_ctx_t can contain an ekt_stream_ctx_t
+ *
+ * an ekt_stream_ctx_t structure holds all of the EKT information for
+ * a specific SRTP stream
+ */
+
+typedef struct ekt_stream_ctx_t {
+ ekt_data_t *data;
+ uint16_t isn; /* initial sequence number */
+ uint8_t encrypted_master_key[SRTP_MAX_KEY_LEN];
+} ekt_stream_ctx_t;
+
+
+
+err_status_t
+ekt_alloc(ekt_stream_t *stream_data, ekt_policy_t policy);
+
+err_status_t
+ekt_stream_init(ekt_stream_t e,
+ ekt_spi_t spi,
+ void *ekt_key,
+ unsigned ekt_cipher_type);
+
+err_status_t
+ekt_stream_init_from_policy(ekt_stream_t e, ekt_policy_t p);
+
+
+
+err_status_t
+srtp_stream_init_from_ekt(srtp_stream_t stream,
+ const void *srtcp_hdr,
+ unsigned pkt_octet_len);
+
+
+void
+ekt_write_data(ekt_stream_t ekt,
+ uint8_t *base_tag,
+ unsigned base_tag_len,
+ int *packet_len,
+ xtd_seq_num_t pkt_index);
+
+/*
+ * We handle EKT by performing some additional steps before
+ * authentication (copying the auth tag into a temporary location,
+ * zeroizing the "base tag" field in the packet)
+ *
+ * With EKT, the tag_len parameter is actually the base tag
+ * length
+ */
+
+err_status_t
+ekt_tag_verification_preproces(uint8_t *pkt_tag,
+ uint8_t *pkt_tag_copy,
+ unsigned tag_len);
+
+err_status_t
+ekt_tag_verification_postproces(uint8_t *pkt_tag,
+ uint8_t *pkt_tag_copy,
+ unsigned tag_len);
+
+
+/*
+ * @brief EKT pre-processing for srtcp tag generation
+ *
+ * This function does the pre-processing of the SRTCP authentication
+ * tag format. When EKT is used, it consists of writing the Encrypted
+ * Master Key, the SRTP ROC, the Initial Sequence Number, and SPI
+ * fields. The Base Authentication Tag field is set to the all-zero
+ * value
+ *
+ * When EKT is not used, this function is a no-op.
+ *
+ */
+
+err_status_t
+srtp_stream_srtcp_auth_tag_generation_preprocess(const srtp_stream_t *s,
+ uint8_t *pkt_tag,
+ unsigned pkt_octet_len);
+
+/* it's not clear that a tag_generation_postprocess function is needed */
+
+err_status_t
+srtcp_auth_tag_generation_postprocess(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EKT_H */
diff --git a/netwerk/srtp/src/include/getopt_s.h b/netwerk/srtp/src/include/getopt_s.h
new file mode 100644
index 000000000..2a6ece34e
--- /dev/null
+++ b/netwerk/srtp/src/include/getopt_s.h
@@ -0,0 +1,60 @@
+/*
+ * getopt.h
+ *
+ * interface to a minimal implementation of the getopt() function,
+ * written so that test applications that use that function can run on
+ * non-POSIX platforms
+ *
+ */
+/*
+ *
+ * Copyright (c) 2001-2006 Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GETOPT_S_H
+#define GETOPT_S_H
+
+/*
+ * getopt_s(), optarg_s, and optind_s are small, locally defined
+ * versions of the POSIX standard getopt() interface.
+ */
+
+int
+getopt_s(int argc, char * const argv[], const char *optstring);
+
+extern char *optarg_s; /* defined in getopt.c */
+
+extern int optind_s; /* defined in getopt.c */
+
+#endif /* GETOPT_S_H */
diff --git a/netwerk/srtp/src/include/rtp.h b/netwerk/srtp/src/include/rtp.h
new file mode 100644
index 000000000..0e0119cf7
--- /dev/null
+++ b/netwerk/srtp/src/include/rtp.h
@@ -0,0 +1,139 @@
+/*
+ * rtp.h
+ *
+ * rtp interface for srtp reference implementation
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ *
+ * data types:
+ *
+ * rtp_msg_t an rtp message (the data that goes on the wire)
+ * rtp_sender_t sender side socket and rtp info
+ * rtp_receiver_t receiver side socket and rtp info
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2006, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#ifndef RTP_H
+#define RTP_H
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#elif defined HAVE_WINSOCK2_H
+# include <winsock2.h>
+#endif
+
+#include "srtp.h"
+
+typedef struct rtp_sender_ctx_t *rtp_sender_t;
+
+typedef struct rtp_receiver_ctx_t *rtp_receiver_t;
+
+int
+rtp_sendto(rtp_sender_t sender, const void* msg, int len);
+
+int
+rtp_recvfrom(rtp_receiver_t receiver, void *msg, int *len);
+
+int
+rtp_receiver_init(rtp_receiver_t rcvr, int sock,
+ struct sockaddr_in addr, unsigned int ssrc);
+
+int
+rtp_sender_init(rtp_sender_t sender, int sock,
+ struct sockaddr_in addr, unsigned int ssrc);
+
+/*
+ * srtp_sender_init(...) initializes an rtp_sender_t
+ */
+
+int
+srtp_sender_init(rtp_sender_t rtp_ctx, /* structure to be init'ed */
+ struct sockaddr_in name, /* socket name */
+ sec_serv_t security_services, /* sec. servs. to be used */
+ unsigned char *input_key /* master key/salt in hex */
+ );
+
+int
+srtp_receiver_init(rtp_receiver_t rtp_ctx, /* structure to be init'ed */
+ struct sockaddr_in name, /* socket name */
+ sec_serv_t security_services, /* sec. servs. to be used */
+ unsigned char *input_key /* master key/salt in hex */
+ );
+
+
+int
+rtp_sender_init_srtp(rtp_sender_t sender, const srtp_policy_t *policy);
+
+int
+rtp_sender_deinit_srtp(rtp_sender_t sender);
+
+int
+rtp_receiver_init_srtp(rtp_receiver_t sender, const srtp_policy_t *policy);
+
+int
+rtp_receiver_deinit_srtp(rtp_receiver_t sender);
+
+
+rtp_sender_t
+rtp_sender_alloc(void);
+
+void
+rtp_sender_dealloc(rtp_sender_t rtp_ctx);
+
+rtp_receiver_t
+rtp_receiver_alloc(void);
+
+void
+rtp_receiver_dealloc(rtp_receiver_t rtp_ctx);
+
+
+/*
+ * RTP_HEADER_LEN indicates the size of an RTP header
+ */
+#define RTP_HEADER_LEN 12
+
+/*
+ * RTP_MAX_BUF_LEN defines the largest RTP packet in the rtp.c implementation
+ */
+#define RTP_MAX_BUF_LEN 16384
+
+
+#endif /* RTP_H */
diff --git a/netwerk/srtp/src/include/rtp_priv.h b/netwerk/srtp/src/include/rtp_priv.h
new file mode 100644
index 000000000..142138667
--- /dev/null
+++ b/netwerk/srtp/src/include/rtp_priv.h
@@ -0,0 +1,74 @@
+/*
+ * rtp_priv.h
+ *
+ * private, internal header file for RTP
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright (c) 2001-2006 Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#ifndef RTP_PRIV_H
+#define RTP_PRIV_H
+
+#include "srtp_priv.h"
+#include "rtp.h"
+
+typedef srtp_hdr_t rtp_hdr_t;
+
+typedef struct {
+ srtp_hdr_t header;
+ char body[RTP_MAX_BUF_LEN];
+} rtp_msg_t;
+
+typedef struct rtp_sender_ctx_t {
+ rtp_msg_t message;
+ int socket;
+ srtp_ctx_t *srtp_ctx;
+ struct sockaddr_in addr; /* reciever's address */
+} rtp_sender_ctx_t;
+
+typedef struct rtp_receiver_ctx_t {
+ rtp_msg_t message;
+ int socket;
+ srtp_ctx_t *srtp_ctx;
+ struct sockaddr_in addr; /* receiver's address */
+} rtp_receiver_ctx_t;
+
+
+#endif /* RTP_PRIV_H */
diff --git a/netwerk/srtp/src/include/srtp.h b/netwerk/srtp/src/include/srtp.h
new file mode 100644
index 000000000..eb95e7d47
--- /dev/null
+++ b/netwerk/srtp/src/include/srtp.h
@@ -0,0 +1,1006 @@
+/*
+ * srtp.h
+ *
+ * interface to libsrtp
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright (c) 2001-2006, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#ifndef SRTP_H
+#define SRTP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "crypto_kernel.h"
+
+/**
+ * @defgroup SRTP Secure RTP
+ *
+ * @brief libSRTP provides functions for protecting RTP and RTCP. See
+ * Section @ref Overview for an introduction to the use of the library.
+ *
+ * @{
+ */
+
+/*
+ * SRTP_MASTER_KEY_LEN is the nominal master key length supported by libSRTP
+ */
+
+#define SRTP_MASTER_KEY_LEN 30
+
+/*
+ * SRTP_MAX_KEY_LEN is the maximum key length supported by libSRTP
+ */
+#define SRTP_MAX_KEY_LEN 64
+
+/*
+ * SRTP_MAX_TAG_LEN is the maximum tag length supported by libSRTP
+ */
+
+#define SRTP_MAX_TAG_LEN 12
+
+/**
+ * SRTP_MAX_TRAILER_LEN is the maximum length of the SRTP trailer
+ * (authentication tag and MKI) supported by libSRTP. This value is
+ * the maximum number of octets that will be added to an RTP packet by
+ * srtp_protect().
+ *
+ * @brief the maximum number of octets added by srtp_protect().
+ */
+#define SRTP_MAX_TRAILER_LEN SRTP_MAX_TAG_LEN
+
+/*
+ * nota bene: since libSRTP doesn't support the use of the MKI, the
+ * SRTP_MAX_TRAILER_LEN value is just the maximum tag length
+ */
+
+/**
+ * @brief sec_serv_t describes a set of security services.
+ *
+ * A sec_serv_t enumeration is used to describe the particular
+ * security services that will be applied by a particular crypto
+ * policy (or other mechanism).
+ */
+
+typedef enum {
+ sec_serv_none = 0, /**< no services */
+ sec_serv_conf = 1, /**< confidentiality */
+ sec_serv_auth = 2, /**< authentication */
+ sec_serv_conf_and_auth = 3 /**< confidentiality and authentication */
+} sec_serv_t;
+
+/**
+ * @brief crypto_policy_t describes a particular crypto policy that
+ * can be applied to an SRTP stream.
+ *
+ * A crypto_policy_t describes a particular cryptographic policy that
+ * can be applied to an SRTP or SRTCP stream. An SRTP session policy
+ * consists of a list of these policies, one for each SRTP stream
+ * in the session.
+ */
+
+typedef struct crypto_policy_t {
+ cipher_type_id_t cipher_type; /**< An integer representing
+ * the type of cipher. */
+ int cipher_key_len; /**< The length of the cipher key
+ * in octets. */
+ auth_type_id_t auth_type; /**< An integer representing the
+ * authentication function. */
+ int auth_key_len; /**< The length of the authentication
+ * function key in octets. */
+ int auth_tag_len; /**< The length of the authentication
+ * tag in octets. */
+ sec_serv_t sec_serv; /**< The flag indicating the security
+ * services to be applied. */
+} crypto_policy_t;
+
+
+/**
+ * @brief ssrc_type_t describes the type of an SSRC.
+ *
+ * An ssrc_type_t enumeration is used to indicate a type of SSRC. See
+ * @ref srtp_policy_t for more informataion.
+ */
+
+typedef enum {
+ ssrc_undefined = 0, /**< Indicates an undefined SSRC type. */
+ ssrc_specific = 1, /**< Indicates a specific SSRC value */
+ ssrc_any_inbound = 2, /**< Indicates any inbound SSRC value
+ (i.e. a value that is used in the
+ function srtp_unprotect()) */
+ ssrc_any_outbound = 3 /**< Indicates any outbound SSRC value
+ (i.e. a value that is used in the
+ function srtp_protect()) */
+} ssrc_type_t;
+
+/**
+ * @brief An ssrc_t represents a particular SSRC value, or a `wildcard' SSRC.
+ *
+ * An ssrc_t represents a particular SSRC value (if its type is
+ * ssrc_specific), or a wildcard SSRC value that will match all
+ * outbound SSRCs (if its type is ssrc_any_outbound) or all inbound
+ * SSRCs (if its type is ssrc_any_inbound).
+ *
+ */
+
+typedef struct {
+ ssrc_type_t type; /**< The type of this particular SSRC */
+ unsigned int value; /**< The value of this SSRC, if it is not a wildcard */
+} ssrc_t;
+
+
+/**
+ * @brief points to an EKT policy
+ */
+typedef struct ekt_policy_ctx_t *ekt_policy_t;
+
+
+/**
+ * @brief points to EKT stream data
+ */
+typedef struct ekt_stream_ctx_t *ekt_stream_t;
+
+
+/**
+ * @brief represents the policy for an SRTP session.
+ *
+ * A single srtp_policy_t struct represents the policy for a single
+ * SRTP stream, and a linked list of these elements represents the
+ * policy for an entire SRTP session. Each element contains the SRTP
+ * and SRTCP crypto policies for that stream, a pointer to the SRTP
+ * master key for that stream, the SSRC describing that stream, or a
+ * flag indicating a `wildcard' SSRC value, and a `next' field that
+ * holds a pointer to the next element in the list of policy elements,
+ * or NULL if it is the last element.
+ *
+ * The wildcard value SSRC_ANY_INBOUND matches any SSRC from an
+ * inbound stream that for which there is no explicit SSRC entry in
+ * another policy element. Similarly, the value SSRC_ANY_OUTBOUND
+ * will matches any SSRC from an outbound stream that does not appear
+ * in another policy element. Note that wildcard SSRCs &b cannot be
+ * used to match both inbound and outbound traffic. This restriction
+ * is intentional, and it allows libSRTP to ensure that no security
+ * lapses result from accidental re-use of SSRC values during key
+ * sharing.
+ *
+ *
+ * @warning The final element of the list @b must have its `next' pointer
+ * set to NULL.
+ */
+
+typedef struct srtp_policy_t {
+ ssrc_t ssrc; /**< The SSRC value of stream, or the
+ * flags SSRC_ANY_INBOUND or
+ * SSRC_ANY_OUTBOUND if key sharing
+ * is used for this policy element.
+ */
+ crypto_policy_t rtp; /**< SRTP crypto policy. */
+ crypto_policy_t rtcp; /**< SRTCP crypto policy. */
+ unsigned char *key; /**< Pointer to the SRTP master key for
+ * this stream. */
+ ekt_policy_t ekt; /**< Pointer to the EKT policy structure
+ * for this stream (if any) */
+ unsigned long window_size; /**< The window size to use for replay
+ * protection. */
+ int allow_repeat_tx; /**< Whether retransmissions of
+ * packets with the same sequence number
+ * are allowed. (Note that such repeated
+ * transmissions must have the same RTP
+ * payload, or a severe security weakness
+ * is introduced!) */
+ struct srtp_policy_t *next; /**< Pointer to next stream policy. */
+} srtp_policy_t;
+
+
+
+
+/**
+ * @brief An srtp_t points to an SRTP session structure.
+ *
+ * The typedef srtp_t is a pointer to a structure that represents
+ * an SRTP session. This datatype is intentially opaque in
+ * order to separate the interface from the implementation.
+ *
+ * An SRTP session consists of all of the traffic sent to the RTP and
+ * RTCP destination transport addresses, using the RTP/SAVP (Secure
+ * Audio/Video Profile). A session can be viewed as a set of SRTP
+ * streams, each of which originates with a different participant.
+ */
+
+typedef struct srtp_ctx_t *srtp_t;
+
+
+/**
+ * @brief An srtp_stream_t points to an SRTP stream structure.
+ *
+ * The typedef srtp_stream_t is a pointer to a structure that
+ * represents an SRTP stream. This datatype is intentionally
+ * opaque in order to separate the interface from the implementation.
+ *
+ * An SRTP stream consists of all of the traffic sent to an SRTP
+ * session by a single participant. A session can be viewed as
+ * a set of streams.
+ *
+ */
+typedef struct srtp_stream_ctx_t *srtp_stream_t;
+
+
+
+/**
+ * @brief srtp_init() initializes the srtp library.
+ *
+ * @warning This function @b must be called before any other srtp
+ * functions.
+ */
+
+err_status_t
+srtp_init(void);
+
+/**
+ * @brief srtp_shutdown() de-initializes the srtp library.
+ *
+ * @warning No srtp functions may be called after calling this function.
+ */
+
+err_status_t
+srtp_shutdown(void);
+
+/**
+ * @brief srtp_protect() is the Secure RTP sender-side packet processing
+ * function.
+ *
+ * The function call srtp_protect(ctx, rtp_hdr, len_ptr) applies SRTP
+ * protection to the RTP packet rtp_hdr (which has length *len_ptr) using
+ * the SRTP context ctx. If err_status_ok is returned, then rtp_hdr
+ * points to the resulting SRTP packet and *len_ptr is the number of
+ * octets in that packet; otherwise, no assumptions should be made
+ * about the value of either data elements.
+ *
+ * The sequence numbers of the RTP packets presented to this function
+ * need not be consecutive, but they @b must be out of order by less
+ * than 2^15 = 32,768 packets.
+ *
+ * @warning This function assumes that it can write the authentication
+ * tag into the location in memory immediately following the RTP
+ * packet, and assumes that the RTP packet is aligned on a 32-bit
+ * boundary.
+ *
+ * @param ctx is the SRTP context to use in processing the packet.
+ *
+ * @param rtp_hdr is a pointer to the RTP packet (before the call); after
+ * the function returns, it points to the srtp packet.
+ *
+ * @param len_ptr is a pointer to the length in octets of the complete
+ * RTP packet (header and body) before the function call, and of the
+ * complete SRTP packet after the call, if err_status_ok was returned.
+ * Otherwise, the value of the data to which it points is undefined.
+ *
+ * @return
+ * - err_status_ok no problems
+ * - err_status_replay_fail rtp sequence number was non-increasing
+ * - @e other failure in cryptographic mechanisms
+ */
+
+err_status_t
+srtp_protect(srtp_t ctx, void *rtp_hdr, int *len_ptr);
+
+/**
+ * @brief srtp_unprotect() is the Secure RTP receiver-side packet
+ * processing function.
+ *
+ * The function call srtp_unprotect(ctx, srtp_hdr, len_ptr) verifies
+ * the Secure RTP protection of the SRTP packet pointed to by srtp_hdr
+ * (which has length *len_ptr), using the SRTP context ctx. If
+ * err_status_ok is returned, then srtp_hdr points to the resulting
+ * RTP packet and *len_ptr is the number of octets in that packet;
+ * otherwise, no assumptions should be made about the value of either
+ * data elements.
+ *
+ * The sequence numbers of the RTP packets presented to this function
+ * need not be consecutive, but they @b must be out of order by less
+ * than 2^15 = 32,768 packets.
+ *
+ * @warning This function assumes that the SRTP packet is aligned on a
+ * 32-bit boundary.
+ *
+ * @param ctx is a pointer to the srtp_t which applies to the
+ * particular packet.
+ *
+ * @param srtp_hdr is a pointer to the header of the SRTP packet
+ * (before the call). after the function returns, it points to the
+ * rtp packet if err_status_ok was returned; otherwise, the value of
+ * the data to which it points is undefined.
+ *
+ * @param len_ptr is a pointer to the length in octets of the complete
+ * srtp packet (header and body) before the function call, and of the
+ * complete rtp packet after the call, if err_status_ok was returned.
+ * Otherwise, the value of the data to which it points is undefined.
+ *
+ * @return
+ * - err_status_ok if the RTP packet is valid.
+ * - err_status_auth_fail if the SRTP packet failed the message
+ * authentication check.
+ * - err_status_replay_fail if the SRTP packet is a replay (e.g. packet has
+ * already been processed and accepted).
+ * - [other] if there has been an error in the cryptographic mechanisms.
+ *
+ */
+
+err_status_t
+srtp_unprotect(srtp_t ctx, void *srtp_hdr, int *len_ptr);
+
+
+/**
+ * @brief srtp_create() allocates and initializes an SRTP session.
+
+ * The function call srtp_create(session, policy, key) allocates and
+ * initializes an SRTP session context, applying the given policy and
+ * key.
+ *
+ * @param session is the SRTP session to which the policy is to be added.
+ *
+ * @param policy is the srtp_policy_t struct that describes the policy
+ * for the session. The struct may be a single element, or it may be
+ * the head of a list, in which case each element of the list is
+ * processed. It may also be NULL, in which case streams should be added
+ * later using srtp_add_stream(). The final element of the list @b must
+ * have its `next' field set to NULL.
+ *
+ * @return
+ * - err_status_ok if creation succeded.
+ * - err_status_alloc_fail if allocation failed.
+ * - err_status_init_fail if initialization failed.
+ */
+
+err_status_t
+srtp_create(srtp_t *session, const srtp_policy_t *policy);
+
+
+/**
+ * @brief srtp_add_stream() allocates and initializes an SRTP stream
+ * within a given SRTP session.
+ *
+ * The function call srtp_add_stream(session, policy) allocates and
+ * initializes a new SRTP stream within a given, previously created
+ * session, applying the policy given as the other argument to that
+ * stream.
+ *
+ * @return values:
+ * - err_status_ok if stream creation succeded.
+ * - err_status_alloc_fail if stream allocation failed
+ * - err_status_init_fail if stream initialization failed.
+ */
+
+err_status_t
+srtp_add_stream(srtp_t session,
+ const srtp_policy_t *policy);
+
+
+/**
+ * @brief srtp_remove_stream() deallocates an SRTP stream.
+ *
+ * The function call srtp_remove_stream(session, ssrc) removes
+ * the SRTP stream with the SSRC value ssrc from the SRTP session
+ * context given by the argument session.
+ *
+ * @param session is the SRTP session from which the stream
+ * will be removed.
+ *
+ * @param ssrc is the SSRC value of the stream to be removed.
+ *
+ * @warning Wildcard SSRC values cannot be removed from a
+ * session.
+ *
+ * @return
+ * - err_status_ok if the stream deallocation succeded.
+ * - [other] otherwise.
+ *
+ */
+
+err_status_t
+srtp_remove_stream(srtp_t session, unsigned int ssrc);
+
+/**
+ * @brief crypto_policy_set_rtp_default() sets a crypto policy
+ * structure to the SRTP default policy for RTP protection.
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_rtp_default(&p) sets the
+ * crypto_policy_t at location p to the SRTP default policy for RTP
+ * protection, as defined in the specification. This function is a
+ * convenience that helps to avoid dealing directly with the policy
+ * data structure. You are encouraged to initialize policy elements
+ * with this function call. Doing so may allow your code to be
+ * forward compatible with later versions of libSRTP that include more
+ * elements in the crypto_policy_t datatype.
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_rtp_default(crypto_policy_t *p);
+
+/**
+ * @brief crypto_policy_set_rtcp_default() sets a crypto policy
+ * structure to the SRTP default policy for RTCP protection.
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_rtcp_default(&p) sets the
+ * crypto_policy_t at location p to the SRTP default policy for RTCP
+ * protection, as defined in the specification. This function is a
+ * convenience that helps to avoid dealing directly with the policy
+ * data structure. You are encouraged to initialize policy elements
+ * with this function call. Doing so may allow your code to be
+ * forward compatible with later versions of libSRTP that include more
+ * elements in the crypto_policy_t datatype.
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_rtcp_default(crypto_policy_t *p);
+
+/**
+ * @brief crypto_policy_set_aes_cm_128_hmac_sha1_80() sets a crypto
+ * policy structure to the SRTP default policy for RTP protection.
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function crypto_policy_set_aes_cm_128_hmac_sha1_80() is a
+ * synonym for crypto_policy_set_rtp_default(). It conforms to the
+ * naming convention used in RFC 4568 (SDP Security Descriptions for
+ * Media Streams).
+ *
+ * @return void.
+ *
+ */
+
+#define crypto_policy_set_aes_cm_128_hmac_sha1_80(p) crypto_policy_set_rtp_default(p)
+
+
+/**
+ * @brief crypto_policy_set_aes_cm_128_hmac_sha1_32() sets a crypto
+ * policy structure to a short-authentication tag policy
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_aes_cm_128_hmac_sha1_32(&p)
+ * sets the crypto_policy_t at location p to use policy
+ * AES_CM_128_HMAC_SHA1_32 as defined in RFC 4568.
+ * This policy uses AES-128
+ * Counter Mode encryption and HMAC-SHA1 authentication, with an
+ * authentication tag that is only 32 bits long. This length is
+ * considered adequate only for protecting audio and video media that
+ * use a stateless playback function. See Section 7.5 of RFC 3711
+ * (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @warning This crypto policy is intended for use in SRTP, but not in
+ * SRTCP. It is recommended that a policy that uses longer
+ * authentication tags be used for SRTCP. See Section 7.5 of RFC 3711
+ * (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_aes_cm_128_hmac_sha1_32(crypto_policy_t *p);
+
+
+
+/**
+ * @brief crypto_policy_set_aes_cm_128_null_auth() sets a crypto
+ * policy structure to an encryption-only policy
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_aes_cm_128_null_auth(&p) sets
+ * the crypto_policy_t at location p to use the SRTP default cipher
+ * (AES-128 Counter Mode), but to use no authentication method. This
+ * policy is NOT RECOMMENDED unless it is unavoidable; see Section 7.5
+ * of RFC 3711 (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @warning This policy is NOT RECOMMENDED for SRTP unless it is
+ * unavoidable, and it is NOT RECOMMENDED at all for SRTCP; see
+ * Section 7.5 of RFC 3711 (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_aes_cm_128_null_auth(crypto_policy_t *p);
+
+
+/**
+ * @brief crypto_policy_set_null_cipher_hmac_sha1_80() sets a crypto
+ * policy structure to an authentication-only policy
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_null_cipher_hmac_sha1_80(&p)
+ * sets the crypto_policy_t at location p to use HMAC-SHA1 with an 80
+ * bit authentication tag to provide message authentication, but to
+ * use no encryption. This policy is NOT RECOMMENDED for SRTP unless
+ * there is a requirement to forego encryption.
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @warning This policy is NOT RECOMMENDED for SRTP unless there is a
+ * requirement to forego encryption.
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_null_cipher_hmac_sha1_80(crypto_policy_t *p);
+
+
+/**
+ * @brief crypto_policy_set_aes_cm_256_hmac_sha1_80() sets a crypto
+ * policy structure to a encryption and authentication policy using AES-256
+ * for RTP protection.
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_aes_cm_256_hmac_sha1_80(&p)
+ * sets the crypto_policy_t at location p to use policy
+ * AES_CM_256_HMAC_SHA1_80 as defined in
+ * draft-ietf-avt-srtp-big-aes-03.txt. This policy uses AES-256
+ * Counter Mode encryption and HMAC-SHA1 authentication, with an 80 bit
+ * authentication tag.
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @return void.
+ *
+ */
+
+void crypto_policy_set_aes_cm_256_hmac_sha1_80(crypto_policy_t *p);
+
+
+/**
+ * @brief crypto_policy_set_aes_cm_256_hmac_sha1_32() sets a crypto
+ * policy structure to a short-authentication tag policy using AES-256
+ * encryption.
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_aes_cm_256_hmac_sha1_32(&p)
+ * sets the crypto_policy_t at location p to use policy
+ * AES_CM_256_HMAC_SHA1_32 as defined in
+ * draft-ietf-avt-srtp-big-aes-03.txt. This policy uses AES-256
+ * Counter Mode encryption and HMAC-SHA1 authentication, with an
+ * authentication tag that is only 32 bits long. This length is
+ * considered adequate only for protecting audio and video media that
+ * use a stateless playback function. See Section 7.5 of RFC 3711
+ * (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @warning This crypto policy is intended for use in SRTP, but not in
+ * SRTCP. It is recommended that a policy that uses longer
+ * authentication tags be used for SRTCP. See Section 7.5 of RFC 3711
+ * (http://www.ietf.org/rfc/rfc3711.txt).
+ *
+ * @return void.
+ *
+ */
+
+void
+crypto_policy_set_aes_cm_256_hmac_sha1_32(crypto_policy_t *p);
+
+
+/**
+ * @brief srtp_dealloc() deallocates storage for an SRTP session
+ * context.
+ *
+ * The function call srtp_dealloc(s) deallocates storage for the
+ * SRTP session context s. This function should be called no more
+ * than one time for each of the contexts allocated by the function
+ * srtp_create().
+ *
+ * @param s is the srtp_t for the session to be deallocated.
+ *
+ * @return
+ * - err_status_ok if there no problems.
+ * - err_status_dealloc_fail a memory deallocation failure occured.
+ */
+
+err_status_t
+srtp_dealloc(srtp_t s);
+
+
+/*
+ * @brief identifies a particular SRTP profile
+ *
+ * An srtp_profile_t enumeration is used to identify a particular SRTP
+ * profile (that is, a set of algorithms and parameters). These
+ * profiles are defined in the DTLS-SRTP draft.
+ */
+
+typedef enum {
+ srtp_profile_reserved = 0,
+ srtp_profile_aes128_cm_sha1_80 = 1,
+ srtp_profile_aes128_cm_sha1_32 = 2,
+ srtp_profile_aes256_cm_sha1_80 = 3,
+ srtp_profile_aes256_cm_sha1_32 = 4,
+ srtp_profile_null_sha1_80 = 5,
+ srtp_profile_null_sha1_32 = 6,
+} srtp_profile_t;
+
+
+/**
+ * @brief crypto_policy_set_from_profile_for_rtp() sets a crypto policy
+ * structure to the appropriate value for RTP based on an srtp_profile_t
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_rtp_default(&policy, profile)
+ * sets the crypto_policy_t at location policy to the policy for RTP
+ * protection, as defined by the srtp_profile_t profile.
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @return values
+ * - err_status_ok no problems were encountered
+ * - err_status_bad_param the profile is not supported
+ *
+ */
+err_status_t
+crypto_policy_set_from_profile_for_rtp(crypto_policy_t *policy,
+ srtp_profile_t profile);
+
+
+
+
+/**
+ * @brief crypto_policy_set_from_profile_for_rtcp() sets a crypto policy
+ * structure to the appropriate value for RTCP based on an srtp_profile_t
+ *
+ * @param p is a pointer to the policy structure to be set
+ *
+ * The function call crypto_policy_set_rtcp_default(&policy, profile)
+ * sets the crypto_policy_t at location policy to the policy for RTCP
+ * protection, as defined by the srtp_profile_t profile.
+ *
+ * This function is a convenience that helps to avoid dealing directly
+ * with the policy data structure. You are encouraged to initialize
+ * policy elements with this function call. Doing so may allow your
+ * code to be forward compatible with later versions of libSRTP that
+ * include more elements in the crypto_policy_t datatype.
+ *
+ * @return values
+ * - err_status_ok no problems were encountered
+ * - err_status_bad_param the profile is not supported
+ *
+ */
+err_status_t
+crypto_policy_set_from_profile_for_rtcp(crypto_policy_t *policy,
+ srtp_profile_t profile);
+
+/**
+ * @brief returns the master key length for a given SRTP profile
+ */
+unsigned int
+srtp_profile_get_master_key_length(srtp_profile_t profile);
+
+
+/**
+ * @brief returns the master salt length for a given SRTP profile
+ */
+unsigned int
+srtp_profile_get_master_salt_length(srtp_profile_t profile);
+
+/**
+ * @brief appends the salt to the key
+ *
+ * The function call append_salt_to_key(k, klen, s, slen)
+ * copies the string s to the location at klen bytes following
+ * the location k.
+ *
+ * @warning There must be at least bytes_in_salt + bytes_in_key bytes
+ * available at the location pointed to by key.
+ *
+ */
+
+void
+append_salt_to_key(unsigned char *key, unsigned int bytes_in_key,
+ unsigned char *salt, unsigned int bytes_in_salt);
+
+
+
+/**
+ * @}
+ */
+
+
+
+/**
+ * @defgroup SRTCP Secure RTCP
+ * @ingroup SRTP
+ *
+ * @brief Secure RTCP functions are used to protect RTCP traffic.
+ *
+ * RTCP is the control protocol for RTP. libSRTP protects RTCP
+ * traffic in much the same way as it does RTP traffic. The function
+ * srtp_protect_rtcp() applies cryptographic protections to outbound
+ * RTCP packets, and srtp_unprotect_rtcp() verifies the protections on
+ * inbound RTCP packets.
+ *
+ * A note on the naming convention: srtp_protect_rtcp() has an srtp_t
+ * as its first argument, and thus has `srtp_' as its prefix. The
+ * trailing `_rtcp' indicates the protocol on which it acts.
+ *
+ * @{
+ */
+
+/**
+ * @brief srtp_protect_rtcp() is the Secure RTCP sender-side packet
+ * processing function.
+ *
+ * The function call srtp_protect_rtcp(ctx, rtp_hdr, len_ptr) applies
+ * SRTCP protection to the RTCP packet rtcp_hdr (which has length
+ * *len_ptr) using the SRTP session context ctx. If err_status_ok is
+ * returned, then rtp_hdr points to the resulting SRTCP packet and
+ * *len_ptr is the number of octets in that packet; otherwise, no
+ * assumptions should be made about the value of either data elements.
+ *
+ * @warning This function assumes that it can write the authentication
+ * tag into the location in memory immediately following the RTCP
+ * packet, and assumes that the RTCP packet is aligned on a 32-bit
+ * boundary.
+ *
+ * @param ctx is the SRTP context to use in processing the packet.
+ *
+ * @param rtcp_hdr is a pointer to the RTCP packet (before the call); after
+ * the function returns, it points to the srtp packet.
+ *
+ * @param pkt_octet_len is a pointer to the length in octets of the
+ * complete RTCP packet (header and body) before the function call,
+ * and of the complete SRTCP packet after the call, if err_status_ok
+ * was returned. Otherwise, the value of the data to which it points
+ * is undefined.
+ *
+ * @return
+ * - err_status_ok if there were no problems.
+ * - [other] if there was a failure in
+ * the cryptographic mechanisms.
+ */
+
+
+err_status_t
+srtp_protect_rtcp(srtp_t ctx, void *rtcp_hdr, int *pkt_octet_len);
+
+/**
+ * @brief srtp_unprotect_rtcp() is the Secure RTCP receiver-side packet
+ * processing function.
+ *
+ * The function call srtp_unprotect_rtcp(ctx, srtp_hdr, len_ptr)
+ * verifies the Secure RTCP protection of the SRTCP packet pointed to
+ * by srtcp_hdr (which has length *len_ptr), using the SRTP session
+ * context ctx. If err_status_ok is returned, then srtcp_hdr points
+ * to the resulting RTCP packet and *len_ptr is the number of octets
+ * in that packet; otherwise, no assumptions should be made about the
+ * value of either data elements.
+ *
+ * @warning This function assumes that the SRTCP packet is aligned on a
+ * 32-bit boundary.
+ *
+ * @param ctx is a pointer to the srtp_t which applies to the
+ * particular packet.
+ *
+ * @param srtcp_hdr is a pointer to the header of the SRTCP packet
+ * (before the call). After the function returns, it points to the
+ * rtp packet if err_status_ok was returned; otherwise, the value of
+ * the data to which it points is undefined.
+ *
+ * @param pkt_octet_len is a pointer to the length in octets of the
+ * complete SRTCP packet (header and body) before the function call,
+ * and of the complete rtp packet after the call, if err_status_ok was
+ * returned. Otherwise, the value of the data to which it points is
+ * undefined.
+ *
+ * @return
+ * - err_status_ok if the RTCP packet is valid.
+ * - err_status_auth_fail if the SRTCP packet failed the message
+ * authentication check.
+ * - err_status_replay_fail if the SRTCP packet is a replay (e.g. has
+ * already been processed and accepted).
+ * - [other] if there has been an error in the cryptographic mechanisms.
+ *
+ */
+
+err_status_t
+srtp_unprotect_rtcp(srtp_t ctx, void *srtcp_hdr, int *pkt_octet_len);
+
+/**
+ * @}
+ */
+
+/**
+ * @defgroup SRTPevents SRTP events and callbacks
+ * @ingroup SRTP
+ *
+ * @brief libSRTP can use a user-provided callback function to
+ * handle events.
+ *
+ *
+ * libSRTP allows a user to provide a callback function to handle
+ * events that need to be dealt with outside of the data plane (see
+ * the enum srtp_event_t for a description of these events). Dealing
+ * with these events is not a strict necessity; they are not
+ * security-critical, but the application may suffer if they are not
+ * handled. The function srtp_set_event_handler() is used to provide
+ * the callback function.
+ *
+ * A default event handler that merely reports on the events as they
+ * happen is included. It is also possible to set the event handler
+ * function to NULL, in which case all events will just be silently
+ * ignored.
+ *
+ * @{
+ */
+
+/**
+ * @brief srtp_event_t defines events that need to be handled
+ *
+ * The enum srtp_event_t defines events that need to be handled
+ * outside the `data plane', such as SSRC collisions and
+ * key expirations.
+ *
+ * When a key expires or the maximum number of packets has been
+ * reached, an SRTP stream will enter an `expired' state in which no
+ * more packets can be protected or unprotected. When this happens,
+ * it is likely that you will want to either deallocate the stream
+ * (using srtp_stream_dealloc()), and possibly allocate a new one.
+ *
+ * When an SRTP stream expires, the other streams in the same session
+ * are unaffected, unless key sharing is used by that stream. In the
+ * latter case, all of the streams in the session will expire.
+ */
+
+typedef enum {
+ event_ssrc_collision, /**<
+ * An SSRC collision occured.
+ */
+ event_key_soft_limit, /**< An SRTP stream reached the soft key
+ * usage limit and will expire soon.
+ */
+ event_key_hard_limit, /**< An SRTP stream reached the hard
+ * key usage limit and has expired.
+ */
+ event_packet_index_limit /**< An SRTP stream reached the hard
+ * packet limit (2^48 packets).
+ */
+} srtp_event_t;
+
+/**
+ * @brief srtp_event_data_t is the structure passed as a callback to
+ * the event handler function
+ *
+ * The struct srtp_event_data_t holds the data passed to the event
+ * handler function.
+ */
+
+typedef struct srtp_event_data_t {
+ srtp_t session; /**< The session in which the event happend. */
+ srtp_stream_t stream; /**< The stream in which the event happend. */
+ srtp_event_t event; /**< An enum indicating the type of event. */
+} srtp_event_data_t;
+
+/**
+ * @brief srtp_event_handler_func_t is the function prototype for
+ * the event handler.
+ *
+ * The typedef srtp_event_handler_func_t is the prototype for the
+ * event handler function. It has as its only argument an
+ * srtp_event_data_t which describes the event that needs to be handled.
+ * There can only be a single, global handler for all events in
+ * libSRTP.
+ */
+
+typedef void (srtp_event_handler_func_t)(srtp_event_data_t *data);
+
+/**
+ * @brief sets the event handler to the function supplied by the caller.
+ *
+ * The function call srtp_install_event_handler(func) sets the event
+ * handler function to the value func. The value NULL is acceptable
+ * as an argument; in this case, events will be ignored rather than
+ * handled.
+ *
+ * @param func is a pointer to a fuction that takes an srtp_event_data_t
+ * pointer as an argument and returns void. This function
+ * will be used by libSRTP to handle events.
+ */
+
+err_status_t
+srtp_install_event_handler(srtp_event_handler_func_t func);
+
+/**
+ * @}
+ */
+/* in host order, so outside the #if */
+#define SRTCP_E_BIT 0x80000000
+/* for byte-access */
+#define SRTCP_E_BYTE_BIT 0x80
+#define SRTCP_INDEX_MASK 0x7fffffff
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SRTP_H */
diff --git a/netwerk/srtp/src/include/srtp_priv.h b/netwerk/srtp/src/include/srtp_priv.h
new file mode 100644
index 000000000..cf2274eb6
--- /dev/null
+++ b/netwerk/srtp/src/include/srtp_priv.h
@@ -0,0 +1,256 @@
+/*
+ * srtp_priv.h
+ *
+ * private internal data structures and functions for libSRTP
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright (c) 2001-2006 Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef SRTP_PRIV_H
+#define SRTP_PRIV_H
+
+#include "srtp.h"
+#include "rdbx.h"
+#include "rdb.h"
+#include "integers.h"
+
+/*
+ * an srtp_hdr_t represents the srtp header
+ *
+ * in this implementation, an srtp_hdr_t is assumed to be 32-bit aligned
+ *
+ * (note that this definition follows that of RFC 1889 Appendix A, but
+ * is not identical)
+ */
+
+#ifndef WORDS_BIGENDIAN
+
+/*
+ * srtp_hdr_t represents an RTP or SRTP header. The bit-fields in
+ * this structure should be declared "unsigned int" instead of
+ * "unsigned char", but doing so causes the MS compiler to not
+ * fully pack the bit fields.
+ */
+
+typedef struct {
+ unsigned char cc:4; /* CSRC count */
+ unsigned char x:1; /* header extension flag */
+ unsigned char p:1; /* padding flag */
+ unsigned char version:2; /* protocol version */
+ unsigned char pt:7; /* payload type */
+ unsigned char m:1; /* marker bit */
+ uint16_t seq; /* sequence number */
+ uint32_t ts; /* timestamp */
+ uint32_t ssrc; /* synchronization source */
+} srtp_hdr_t;
+
+#else /* BIG_ENDIAN */
+
+typedef struct {
+ unsigned char version:2; /* protocol version */
+ unsigned char p:1; /* padding flag */
+ unsigned char x:1; /* header extension flag */
+ unsigned char cc:4; /* CSRC count */
+ unsigned char m:1; /* marker bit */
+ unsigned pt:7; /* payload type */
+ uint16_t seq; /* sequence number */
+ uint32_t ts; /* timestamp */
+ uint32_t ssrc; /* synchronization source */
+} srtp_hdr_t;
+
+#endif
+
+typedef struct {
+ uint16_t profile_specific; /* profile-specific info */
+ uint16_t length; /* number of 32-bit words in extension */
+} srtp_hdr_xtnd_t;
+
+
+/*
+ * srtcp_hdr_t represents a secure rtcp header
+ *
+ * in this implementation, an srtcp header is assumed to be 32-bit
+ * alinged
+ */
+
+#ifndef WORDS_BIGENDIAN
+
+typedef struct {
+ unsigned char rc:5; /* reception report count */
+ unsigned char p:1; /* padding flag */
+ unsigned char version:2; /* protocol version */
+ unsigned char pt:8; /* payload type */
+ uint16_t len; /* length */
+ uint32_t ssrc; /* synchronization source */
+} srtcp_hdr_t;
+
+typedef struct {
+ unsigned int index:31; /* srtcp packet index in network order! */
+ unsigned int e:1; /* encrypted? 1=yes */
+ /* optional mikey/etc go here */
+ /* and then the variable-length auth tag */
+} srtcp_trailer_t;
+
+
+#else /* BIG_ENDIAN */
+
+typedef struct {
+ unsigned char version:2; /* protocol version */
+ unsigned char p:1; /* padding flag */
+ unsigned char rc:5; /* reception report count */
+ unsigned char pt:8; /* payload type */
+ uint16_t len; /* length */
+ uint32_t ssrc; /* synchronization source */
+} srtcp_hdr_t;
+
+typedef struct {
+ unsigned int version:2; /* protocol version */
+ unsigned int p:1; /* padding flag */
+ unsigned int count:5; /* varies by packet type */
+ unsigned int pt:8; /* payload type */
+ uint16_t length; /* len of uint32s of packet less header */
+} rtcp_common_t;
+
+typedef struct {
+ unsigned int e:1; /* encrypted? 1=yes */
+ unsigned int index:31; /* srtcp packet index */
+ /* optional mikey/etc go here */
+ /* and then the variable-length auth tag */
+} srtcp_trailer_t;
+
+#endif
+
+
+/*
+ * the following declarations are libSRTP internal functions
+ */
+
+/*
+ * srtp_get_stream(ssrc) returns a pointer to the stream corresponding
+ * to ssrc, or NULL if no stream exists for that ssrc
+ */
+
+srtp_stream_t
+srtp_get_stream(srtp_t srtp, uint32_t ssrc);
+
+
+/*
+ * srtp_stream_init_keys(s, k) (re)initializes the srtp_stream_t s by
+ * deriving all of the needed keys using the KDF and the key k.
+ */
+
+
+err_status_t
+srtp_stream_init_keys(srtp_stream_t srtp, const void *key);
+
+/*
+ * srtp_stream_init(s, p) initializes the srtp_stream_t s to
+ * use the policy at the location p
+ */
+err_status_t
+srtp_stream_init(srtp_stream_t srtp,
+ const srtp_policy_t *p);
+
+
+/*
+ * libsrtp internal datatypes
+ */
+
+typedef enum direction_t {
+ dir_unknown = 0,
+ dir_srtp_sender = 1,
+ dir_srtp_receiver = 2
+} direction_t;
+
+/*
+ * an srtp_stream_t has its own SSRC, encryption key, authentication
+ * key, sequence number, and replay database
+ *
+ * note that the keys might not actually be unique, in which case the
+ * cipher_t and auth_t pointers will point to the same structures
+ */
+
+typedef struct srtp_stream_ctx_t {
+ uint32_t ssrc;
+ cipher_t *rtp_cipher;
+ auth_t *rtp_auth;
+ rdbx_t rtp_rdbx;
+ sec_serv_t rtp_services;
+ cipher_t *rtcp_cipher;
+ auth_t *rtcp_auth;
+ rdb_t rtcp_rdb;
+ sec_serv_t rtcp_services;
+ key_limit_ctx_t *limit;
+ direction_t direction;
+ int allow_repeat_tx;
+ ekt_stream_t ekt;
+ struct srtp_stream_ctx_t *next; /* linked list of streams */
+} srtp_stream_ctx_t;
+
+
+/*
+ * an srtp_ctx_t holds a stream list and a service description
+ */
+
+typedef struct srtp_ctx_t {
+ srtp_stream_ctx_t *stream_list; /* linked list of streams */
+ srtp_stream_ctx_t *stream_template; /* act as template for other streams */
+} srtp_ctx_t;
+
+
+
+/*
+ * srtp_handle_event(srtp, srtm, evnt) calls the event handling
+ * function, if there is one.
+ *
+ * This macro is not included in the documentation as it is
+ * an internal-only function.
+ */
+
+#define srtp_handle_event(srtp, strm, evnt) \
+ if(srtp_event_handler) { \
+ srtp_event_data_t data; \
+ data.session = srtp; \
+ data.stream = strm; \
+ data.event = evnt; \
+ srtp_event_handler(&data); \
+}
+
+
+#endif /* SRTP_PRIV_H */
diff --git a/netwerk/srtp/src/include/ut_sim.h b/netwerk/srtp/src/include/ut_sim.h
new file mode 100644
index 000000000..c25feeb65
--- /dev/null
+++ b/netwerk/srtp/src/include/ut_sim.h
@@ -0,0 +1,80 @@
+/*
+ * ut-sim.h
+ *
+ * an unreliable transport simulator
+ * (for testing replay databases and suchlike)
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2006, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+
+#ifndef UT_SIM_H
+#define UT_SIM_H
+
+#include "integers.h" /* for uint32_t */
+
+#define UT_BUF 160 /* maximum amount of packet reorder */
+
+typedef struct {
+ uint32_t index;
+ uint32_t buffer[UT_BUF];
+} ut_connection;
+
+/*
+ * ut_init(&u) initializes the ut_connection
+ *
+ * this function should always be the first one called on a new
+ * ut_connection
+ */
+
+void
+ut_init(ut_connection *utc);
+
+/*
+ * ut_next_index(&u) returns the next index from the simulated
+ * unreliable connection
+ */
+
+uint32_t
+ut_next_index(ut_connection *utc);
+
+
+#endif /* UT_SIM_H */