diff options
Diffstat (limited to 'third_party/srtp/crypto/cipher/aes_cbc.c')
| -rw-r--r-- | third_party/srtp/crypto/cipher/aes_cbc.c | 177 |
1 files changed, 149 insertions, 28 deletions
diff --git a/third_party/srtp/crypto/cipher/aes_cbc.c b/third_party/srtp/crypto/cipher/aes_cbc.c index 8fc6a327..11953bf2 100644 --- a/third_party/srtp/crypto/cipher/aes_cbc.c +++ b/third_party/srtp/crypto/cipher/aes_cbc.c @@ -43,6 +43,9 @@ * */ +#ifdef HAVE_CONFIG_H + #include <config.h> +#endif #include "aes_cbc.h" #include "alloc.h" @@ -55,7 +58,7 @@ debug_module_t mod_aes_cbc = { err_status_t -aes_cbc_alloc(cipher_t **c, int key_len) { +aes_cbc_alloc(cipher_t **c, int key_len, int tlen) { extern cipher_type_t aes_cbc; uint8_t *pointer; int tmp; @@ -63,10 +66,10 @@ aes_cbc_alloc(cipher_t **c, int key_len) { debug_print(mod_aes_cbc, "allocating cipher with key length %d", key_len); - if (key_len != 16) + if (key_len != 16 && key_len != 24 && key_len != 32) return err_status_bad_param; - /* allocate memory a cipher of type aes_icm */ + /* allocate memory a cipher of type aes_cbc */ tmp = (sizeof(aes_cbc_ctx_t) + sizeof(cipher_t)); pointer = (uint8_t*)crypto_alloc(tmp); if (pointer == NULL) @@ -74,6 +77,7 @@ aes_cbc_alloc(cipher_t **c, int key_len) { /* set pointers */ *c = (cipher_t *)pointer; + (*c)->algorithm = AES_CBC; (*c)->type = &aes_cbc; (*c)->state = pointer + sizeof(cipher_t); @@ -104,35 +108,25 @@ aes_cbc_dealloc(cipher_t *c) { } err_status_t -aes_cbc_context_init(aes_cbc_ctx_t *c, const uint8_t *key, - cipher_direction_t dir) { - v128_t tmp_key; - - /* set tmp_key (for alignment) */ - v128_copy_octet_string(&tmp_key, key); +aes_cbc_context_init(aes_cbc_ctx_t *c, const uint8_t *key, int key_len) { debug_print(mod_aes_cbc, - "key: %s", v128_hex_string(&tmp_key)); - - /* expand key for the appropriate direction */ - switch (dir) { - case (direction_encrypt): - aes_expand_encryption_key(&tmp_key, c->expanded_key); - break; - case (direction_decrypt): - aes_expand_decryption_key(&tmp_key, c->expanded_key); - break; - default: - return err_status_bad_param; - } + "key: %s", octet_string_hex_string(key, key_len)); + /* + * Save the key until we have the IV later. We don't + * know the direction until the IV is set. + */ + c->key_len = (key_len <= 32 ? key_len : 32); + memcpy(c->key, key, c->key_len); return err_status_ok; } err_status_t -aes_cbc_set_iv(aes_cbc_ctx_t *c, void *iv) { +aes_cbc_set_iv(aes_cbc_ctx_t *c, void *iv, int direction) { + err_status_t status; int i; /* v128_t *input = iv; */ uint8_t *input = (uint8_t*) iv; @@ -143,6 +137,24 @@ aes_cbc_set_iv(aes_cbc_ctx_t *c, void *iv) { debug_print(mod_aes_cbc, "setting iv: %s", v128_hex_string(&c->state)); + /* expand key for the appropriate direction */ + switch (direction) { + case (direction_encrypt): + status = aes_expand_encryption_key(c->key, c->key_len, &c->expanded_key); + memset(c->key, 0, 32); + if (status) + return status; + break; + case (direction_decrypt): + status = aes_expand_decryption_key(c->key, c->key_len, &c->expanded_key); + memset(c->key, 0, 32); + if (status) + return status; + break; + default: + return err_status_bad_param; + } + return err_status_ok; } @@ -181,7 +193,7 @@ aes_cbc_encrypt(aes_cbc_ctx_t *c, debug_print(mod_aes_cbc, "inblock: %s", v128_hex_string(&c->state)); - aes_encrypt(&c->state, c->expanded_key); + aes_encrypt(&c->state, &c->expanded_key); debug_print(mod_aes_cbc, "outblock: %s", v128_hex_string(&c->state)); @@ -236,7 +248,7 @@ aes_cbc_decrypt(aes_cbc_ctx_t *c, v128_hex_string(&state)); /* decrypt state */ - aes_decrypt(&state, c->expanded_key); + aes_decrypt(&state, &c->expanded_key); debug_print(mod_aes_cbc, "outblock: %s", v128_hex_string(&state)); @@ -332,7 +344,7 @@ char aes_cbc_description[] = "aes cipher block chaining (cbc) mode"; /* - * Test case 0 is derived from FIPS 197 Appendix A; it uses an + * Test case 0 is derived from FIPS 197 Appendix C; it uses an * all-zero IV, so that the first block encryption matches the test * case in that appendix. This property provides a check of the base * AES encryption and decryption algorithms; if CBC fails on some @@ -374,6 +386,9 @@ cipher_test_case_t aes_cbc_test_case_0 = { aes_cbc_test_case_0_plaintext, /* plaintext */ 32, /* octets in ciphertext */ aes_cbc_test_case_0_ciphertext, /* ciphertext */ + 0, + NULL, + 0, NULL /* pointer to next testcase */ }; @@ -425,20 +440,126 @@ cipher_test_case_t aes_cbc_test_case_1 = { aes_cbc_test_case_1_plaintext, /* plaintext */ 80, /* octets in ciphertext */ aes_cbc_test_case_1_ciphertext, /* ciphertext */ + 0, + NULL, + 0, &aes_cbc_test_case_0 /* pointer to next testcase */ }; +/* + * Test case 2 is like test case 0, but for 256-bit keys. (FIPS 197 + * appendix C.3). + */ + + +uint8_t aes_cbc_test_case_2_key[32] = { + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f +}; + +uint8_t aes_cbc_test_case_2_plaintext[64] = { + 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, + 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff +}; + +uint8_t aes_cbc_test_case_2_ciphertext[80] = { + 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf, + 0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89, + 0x72, 0x72, 0x6e, 0xe7, 0x71, 0x39, 0xbf, 0x11, + 0xe5, 0x40, 0xe2, 0x7c, 0x54, 0x65, 0x1d, 0xee +}; + +uint8_t aes_cbc_test_case_2_iv[16] = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +cipher_test_case_t aes_cbc_test_case_2 = { + 32, /* octets in key */ + aes_cbc_test_case_2_key, /* key */ + aes_cbc_test_case_2_iv, /* initialization vector */ + 16, /* octets in plaintext */ + aes_cbc_test_case_2_plaintext, /* plaintext */ + 32, /* octets in ciphertext */ + aes_cbc_test_case_2_ciphertext, /* ciphertext */ + 0, + NULL, + 0, + &aes_cbc_test_case_1 /* pointer to next testcase */ +}; + + +/* + * this test case is taken directly from Appendix F.2 of NIST Special + * Publication SP 800-38A + */ + +uint8_t aes_cbc_test_case_3_key[32] = { + 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, + 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, + 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, + 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 +}; + +uint8_t aes_cbc_test_case_3_plaintext[64] = { + 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, + 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, + 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, + 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, + 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, + 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, + 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, + 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 +}; + +uint8_t aes_cbc_test_case_3_ciphertext[80] = { + 0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, + 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6, + 0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, + 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d, + 0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, + 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61, + 0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, + 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b, + 0xfb, 0x98, 0x20, 0x2c, 0x45, 0xb2, 0xe4, 0xa0, + 0x63, 0xc4, 0x68, 0xba, 0x84, 0x39, 0x16, 0x5a +}; + +uint8_t aes_cbc_test_case_3_iv[16] = { + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f +}; + +cipher_test_case_t aes_cbc_test_case_3 = { + 32, /* octets in key */ + aes_cbc_test_case_3_key, /* key */ + aes_cbc_test_case_3_iv, /* initialization vector */ + 64, /* octets in plaintext */ + aes_cbc_test_case_3_plaintext, /* plaintext */ + 80, /* octets in ciphertext */ + aes_cbc_test_case_3_ciphertext, /* ciphertext */ + 0, + NULL, + 0, + &aes_cbc_test_case_2 /* pointer to next testcase */ +}; + cipher_type_t aes_cbc = { (cipher_alloc_func_t) aes_cbc_alloc, (cipher_dealloc_func_t) aes_cbc_dealloc, (cipher_init_func_t) aes_cbc_context_init, + (cipher_set_aad_func_t) 0, (cipher_encrypt_func_t) aes_cbc_nist_encrypt, (cipher_decrypt_func_t) aes_cbc_nist_decrypt, (cipher_set_iv_func_t) aes_cbc_set_iv, + (cipher_get_tag_func_t) 0, (char *) aes_cbc_description, (int) 0, /* instance count */ - (cipher_test_case_t *) &aes_cbc_test_case_0, - (debug_module_t *) &mod_aes_cbc + (cipher_test_case_t *) &aes_cbc_test_case_3, + (debug_module_t *) &mod_aes_cbc, + (cipher_type_id_t) AES_CBC }; |