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-rw-r--r--netwerk/srtp/src/crypto/rng/ctr_prng.c108
-rw-r--r--netwerk/srtp/src/crypto/rng/prng.c180
-rw-r--r--netwerk/srtp/src/crypto/rng/rand_linux_kernel.c65
-rw-r--r--netwerk/srtp/src/crypto/rng/rand_source.c158
4 files changed, 511 insertions, 0 deletions
diff --git a/netwerk/srtp/src/crypto/rng/ctr_prng.c b/netwerk/srtp/src/crypto/rng/ctr_prng.c
new file mode 100644
index 000000000..41d46a8f5
--- /dev/null
+++ b/netwerk/srtp/src/crypto/rng/ctr_prng.c
@@ -0,0 +1,108 @@
+/*
+ * ctr_prng.c
+ *
+ * counter mode based pseudorandom source
+ *
+ * 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.
+ *
+ */
+
+
+#include "prng.h"
+
+/* single, global prng structure */
+
+ctr_prng_t ctr_prng;
+
+err_status_t
+ctr_prng_init(rand_source_func_t random_source) {
+ uint8_t tmp_key[32];
+ err_status_t status;
+
+ /* initialize output count to zero */
+ ctr_prng.octet_count = 0;
+
+ /* set random source */
+ ctr_prng.rand = random_source;
+
+ /* initialize secret key from random source */
+ status = random_source(tmp_key, 32);
+ if (status)
+ return status;
+
+ /* initialize aes ctr context with random key */
+ status = aes_icm_context_init(&ctr_prng.state, tmp_key, 30);
+ if (status)
+ return status;
+
+ return err_status_ok;
+}
+
+err_status_t
+ctr_prng_get_octet_string(void *dest, uint32_t len) {
+ err_status_t status;
+
+ /*
+ * if we need to re-initialize the prng, do so now
+ *
+ * avoid 32-bit overflows by subtracting instead of adding
+ */
+ if (ctr_prng.octet_count > MAX_PRNG_OUT_LEN - len) {
+ status = ctr_prng_init(ctr_prng.rand);
+ if (status)
+ return status;
+ }
+ ctr_prng.octet_count += len;
+
+ /*
+ * write prng output
+ */
+ status = aes_icm_output(&ctr_prng.state, (uint8_t*)dest, len);
+ if (status)
+ return status;
+
+ return err_status_ok;
+}
+
+err_status_t
+ctr_prng_deinit(void) {
+
+ /* nothing */
+
+ return err_status_ok;
+}
diff --git a/netwerk/srtp/src/crypto/rng/prng.c b/netwerk/srtp/src/crypto/rng/prng.c
new file mode 100644
index 000000000..62b5e11d4
--- /dev/null
+++ b/netwerk/srtp/src/crypto/rng/prng.c
@@ -0,0 +1,180 @@
+/*
+ * prng.c
+ *
+ * pseudorandom source
+ *
+ * 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.
+ *
+ */
+
+
+#include "prng.h"
+
+/* single, global prng structure */
+
+x917_prng_t x917_prng;
+
+err_status_t
+x917_prng_init(rand_source_func_t random_source) {
+ uint8_t tmp_key[16];
+ err_status_t status;
+
+ /* initialize output count to zero */
+ x917_prng.octet_count = 0;
+
+ /* set random source */
+ x917_prng.rand = random_source;
+
+ /* initialize secret key from random source */
+ status = random_source(tmp_key, 16);
+ if (status)
+ return status;
+
+ /* expand aes key */
+ aes_expand_encryption_key(tmp_key, 16, &x917_prng.key);
+
+ /* initialize prng state from random source */
+ status = x917_prng.rand((uint8_t *)&x917_prng.state, 16);
+ if (status)
+ return status;
+
+ return err_status_ok;
+}
+
+err_status_t
+x917_prng_get_octet_string(uint8_t *dest, uint32_t len) {
+ uint32_t t;
+ v128_t buffer;
+ uint32_t i, tail_len;
+ err_status_t status;
+
+ /*
+ * if we need to re-initialize the prng, do so now
+ *
+ * avoid overflows by subtracting instead of adding
+ */
+ if (x917_prng.octet_count > MAX_PRNG_OUT_LEN - len) {
+ status = x917_prng_init(x917_prng.rand);
+ if (status)
+ return status;
+ }
+ x917_prng.octet_count += len;
+
+ /* find out the time */
+ t = (uint32_t)time(NULL);
+
+ /* loop until we have output enough data */
+ for (i=0; i < len/16; i++) {
+
+ /* exor time into state */
+ x917_prng.state.v32[0] ^= t;
+
+ /* copy state into buffer */
+ v128_copy(&buffer, &x917_prng.state);
+
+ /* apply aes to buffer */
+ aes_encrypt(&buffer, &x917_prng.key);
+
+ /* write data to output */
+ *dest++ = buffer.v8[0];
+ *dest++ = buffer.v8[1];
+ *dest++ = buffer.v8[2];
+ *dest++ = buffer.v8[3];
+ *dest++ = buffer.v8[4];
+ *dest++ = buffer.v8[5];
+ *dest++ = buffer.v8[6];
+ *dest++ = buffer.v8[7];
+ *dest++ = buffer.v8[8];
+ *dest++ = buffer.v8[9];
+ *dest++ = buffer.v8[10];
+ *dest++ = buffer.v8[11];
+ *dest++ = buffer.v8[12];
+ *dest++ = buffer.v8[13];
+ *dest++ = buffer.v8[14];
+ *dest++ = buffer.v8[15];
+
+ /* exor time into buffer */
+ buffer.v32[0] ^= t;
+
+ /* encrypt buffer */
+ aes_encrypt(&buffer, &x917_prng.key);
+
+ /* copy buffer into state */
+ v128_copy(&x917_prng.state, &buffer);
+
+ }
+
+ /* if we need to output any more octets, we'll do so now */
+ tail_len = len % 16;
+ if (tail_len) {
+
+ /* exor time into state */
+ x917_prng.state.v32[0] ^= t;
+
+ /* copy value into buffer */
+ v128_copy(&buffer, &x917_prng.state);
+
+ /* apply aes to buffer */
+ aes_encrypt(&buffer, &x917_prng.key);
+
+ /* write data to output */
+ for (i=0; i < tail_len; i++) {
+ *dest++ = buffer.v8[i];
+ }
+
+ /* now update the state one more time */
+
+ /* exor time into buffer */
+ buffer.v32[0] ^= t;
+
+ /* encrypt buffer */
+ aes_encrypt(&buffer, &x917_prng.key);
+
+ /* copy buffer into state */
+ v128_copy(&x917_prng.state, &buffer);
+
+ }
+
+ return err_status_ok;
+}
+
+err_status_t
+x917_prng_deinit(void) {
+
+ return err_status_ok;
+}
diff --git a/netwerk/srtp/src/crypto/rng/rand_linux_kernel.c b/netwerk/srtp/src/crypto/rng/rand_linux_kernel.c
new file mode 100644
index 000000000..c51978e5e
--- /dev/null
+++ b/netwerk/srtp/src/crypto/rng/rand_linux_kernel.c
@@ -0,0 +1,65 @@
+/*
+ * rand_linux_kernel.c
+ *
+ * implements a random source using Linux kernel functions
+ *
+ * Marcus Sundberg
+ * Ingate Systems AB
+ */
+/*
+ *
+ * Copyright(c) 2005 Ingate Systems AB
+ * 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 author(s) 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.
+ *
+ */
+
+#include "config.h"
+#include "rand_source.h"
+
+
+err_status_t
+rand_source_init(void) {
+ return err_status_ok;
+}
+
+err_status_t
+rand_source_get_octet_string(void *dest, uint32_t len) {
+
+ get_random_bytes(dest, len);
+
+ return err_status_ok;
+}
+
+err_status_t
+rand_source_deinit(void) {
+ return err_status_ok;
+}
diff --git a/netwerk/srtp/src/crypto/rng/rand_source.c b/netwerk/srtp/src/crypto/rng/rand_source.c
new file mode 100644
index 000000000..1eb6fbb09
--- /dev/null
+++ b/netwerk/srtp/src/crypto/rng/rand_source.c
@@ -0,0 +1,158 @@
+/*
+ * rand_source.c
+ *
+ * implements a random source based on /dev/random
+ *
+ * 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.
+ *
+ */
+
+#include "config.h"
+
+#ifdef DEV_URANDOM
+# include <fcntl.h> /* for open() */
+# include <unistd.h> /* for close() */
+#elif defined(HAVE_RAND_S)
+# define _CRT_RAND_S
+# include <stdlib.h>
+#else
+# include <stdio.h>
+#endif
+
+#include "rand_source.h"
+
+
+/*
+ * global dev_rand_fdes is file descriptor for /dev/random
+ *
+ * This variable is also used to indicate that the random source has
+ * been initialized. When this variable is set to the value of the
+ * #define RAND_SOURCE_NOT_READY, it indicates that the random source
+ * is not ready to be used. The value of the #define
+ * RAND_SOURCE_READY is for use whenever that variable is used as an
+ * indicator of the state of the random source, but not as a file
+ * descriptor.
+ */
+
+#define RAND_SOURCE_NOT_READY (-1)
+#define RAND_SOURCE_READY (17)
+
+static int dev_random_fdes = RAND_SOURCE_NOT_READY;
+
+
+err_status_t
+rand_source_init(void) {
+ if (dev_random_fdes >= 0) {
+ /* already open */
+ return err_status_ok;
+ }
+#ifdef DEV_URANDOM
+ /* open random source for reading */
+ dev_random_fdes = open(DEV_URANDOM, O_RDONLY);
+ if (dev_random_fdes < 0)
+ return err_status_init_fail;
+#elif defined(HAVE_RAND_S)
+ dev_random_fdes = RAND_SOURCE_READY;
+#else
+ /* no random source available; let the user know */
+ fprintf(stderr, "WARNING: no real random source present!\n");
+ dev_random_fdes = RAND_SOURCE_READY;
+#endif
+ return err_status_ok;
+}
+
+err_status_t
+rand_source_get_octet_string(void *dest, uint32_t len) {
+
+ /*
+ * read len octets from /dev/random to dest, and
+ * check return value to make sure enough octets were
+ * written
+ */
+#ifdef DEV_URANDOM
+ uint8_t *dst = (uint8_t *)dest;
+ while (len)
+ {
+ ssize_t num_read = read(dev_random_fdes, dst, len);
+ if (num_read <= 0 || num_read > len)
+ return err_status_fail;
+ len -= num_read;
+ dst += num_read;
+ }
+#elif defined(HAVE_RAND_S)
+ uint8_t *dst = (uint8_t *)dest;
+ while (len)
+ {
+ unsigned int val;
+ errno_t err = rand_s(&val);
+
+ if (err != 0)
+ return err_status_fail;
+
+ *dst++ = val & 0xff;
+ len--;
+ }
+#else
+ /* Generic C-library (rand()) version */
+ /* This is a random source of last resort */
+ uint8_t *dst = (uint8_t *)dest;
+ while (len)
+ {
+ int val = rand();
+ /* rand() returns 0-32767 (ugh) */
+ /* Is this a good enough way to get random bytes?
+ It is if it passes FIPS-140... */
+ *dst++ = val & 0xff;
+ len--;
+ }
+#endif
+ return err_status_ok;
+}
+
+err_status_t
+rand_source_deinit(void) {
+ if (dev_random_fdes < 0)
+ return err_status_dealloc_fail; /* well, we haven't really failed, *
+ * but there is something wrong */
+#ifdef DEV_URANDOM
+ close(dev_random_fdes);
+#endif
+ dev_random_fdes = RAND_SOURCE_NOT_READY;
+
+ return err_status_ok;
+}