diff options
Diffstat (limited to 'netwerk/srtp/src/crypto/cipher/null_cipher.c')
| -rw-r--r-- | netwerk/srtp/src/crypto/cipher/null_cipher.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/netwerk/srtp/src/crypto/cipher/null_cipher.c b/netwerk/srtp/src/crypto/cipher/null_cipher.c new file mode 100644 index 000000000..724f4df3a --- /dev/null +++ b/netwerk/srtp/src/crypto/cipher/null_cipher.c @@ -0,0 +1,153 @@ +/* + * null_cipher.c + * + * A null cipher implementation. This cipher leaves the plaintext + * unchanged. + * + * 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 "datatypes.h" +#include "null_cipher.h" +#include "alloc.h" + +/* the null_cipher uses the cipher debug module */ + +extern debug_module_t mod_cipher; + +err_status_t +null_cipher_alloc(cipher_t **c, int key_len) { + extern cipher_type_t null_cipher; + uint8_t *pointer; + + debug_print(mod_cipher, + "allocating cipher with key length %d", key_len); + + /* allocate memory a cipher of type null_cipher */ + pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); + if (pointer == NULL) + return err_status_alloc_fail; + + /* set pointers */ + *c = (cipher_t *)pointer; + (*c)->type = &null_cipher; + (*c)->state = pointer + sizeof(cipher_t); + + /* set key size */ + (*c)->key_len = key_len; + + /* increment ref_count */ + null_cipher.ref_count++; + + return err_status_ok; + +} + +err_status_t +null_cipher_dealloc(cipher_t *c) { + extern cipher_type_t null_cipher; + + /* zeroize entire state*/ + octet_string_set_to_zero((uint8_t *)c, + sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); + + /* free memory of type null_cipher */ + crypto_free(c); + + /* decrement reference count */ + null_cipher.ref_count--; + + return err_status_ok; + +} + +err_status_t +null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) { + + debug_print(mod_cipher, "initializing null cipher", NULL); + + return err_status_ok; +} + +err_status_t +null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) { + return err_status_ok; +} + +err_status_t +null_cipher_encrypt(null_cipher_ctx_t *c, + unsigned char *buf, unsigned int *bytes_to_encr) { + return err_status_ok; +} + +char +null_cipher_description[] = "null cipher"; + +cipher_test_case_t +null_cipher_test_0 = { + 0, /* octets in key */ + NULL, /* key */ + 0, /* packet index */ + 0, /* octets in plaintext */ + NULL, /* plaintext */ + 0, /* octets in plaintext */ + NULL, /* ciphertext */ + NULL /* pointer to next testcase */ +}; + + +/* + * note: the decrypt function is idential to the encrypt function + */ + +cipher_type_t null_cipher = { + (cipher_alloc_func_t) null_cipher_alloc, + (cipher_dealloc_func_t) null_cipher_dealloc, + (cipher_init_func_t) null_cipher_init, + (cipher_encrypt_func_t) null_cipher_encrypt, + (cipher_decrypt_func_t) null_cipher_encrypt, + (cipher_set_iv_func_t) null_cipher_set_iv, + (char *) null_cipher_description, + (int) 0, + (cipher_test_case_t *) &null_cipher_test_0, + (debug_module_t *) NULL, + (cipher_type_id_t) NULL_CIPHER +}; + |