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-rw-r--r--crypto/cipher/aes_icm.c512
1 files changed, 0 insertions, 512 deletions
diff --git a/crypto/cipher/aes_icm.c b/crypto/cipher/aes_icm.c
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index 5a38dee..0000000
--- a/crypto/cipher/aes_icm.c
+++ /dev/null
@@ -1,512 +0,0 @@
-/*
- * aes_icm.c
- *
- * AES Integer Counter Mode
- *
- * 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.
- *
- */
-
-
-#define ALIGN_32 0
-
-#include "aes_icm.h"
-#include "alloc.h"
-
-
-debug_module_t mod_aes_icm = {
- 0, /* debugging is off by default */
- "aes icm" /* printable module name */
-};
-
-/*
- * integer counter mode works as follows:
- *
- * 16 bits
- * <----->
- * +------+------+------+------+------+------+------+------+
- * | nonce | pakcet index | ctr |---+
- * +------+------+------+------+------+------+------+------+ |
- * |
- * +------+------+------+------+------+------+------+------+ v
- * | salt |000000|->(+)
- * +------+------+------+------+------+------+------+------+ |
- * |
- * +---------+
- * | encrypt |
- * +---------+
- * |
- * +------+------+------+------+------+------+------+------+ |
- * | keystream block |<--+
- * +------+------+------+------+------+------+------+------+
- *
- * All fields are big-endian
- *
- * ctr is the block counter, which increments from zero for
- * each packet (16 bits wide)
- *
- * packet index is distinct for each packet (48 bits wide)
- *
- * nonce can be distinct across many uses of the same key, or
- * can be a fixed value per key, or can be per-packet randomness
- * (64 bits)
- *
- */
-
-err_status_t
-aes_icm_alloc_ismacryp(cipher_t **c, int key_len, int forIsmacryp) {
- extern cipher_type_t aes_icm;
- uint8_t *pointer;
- int tmp;
-
- debug_print(mod_aes_icm,
- "allocating cipher with key length %d", key_len);
-
- /*
- * Ismacryp, for example, uses 16 byte key + 8 byte
- * salt so this function is called with key_len = 24.
- * The check for key_len = 30 does not apply. Our usage
- * of aes functions with key_len = values other than 30
- * has not broken anything. Don't know what would be the
- * effect of skipping this check for srtp in general.
- */
- if (!forIsmacryp && key_len != 30)
- return err_status_bad_param;
-
- /* allocate memory a cipher of type aes_icm */
- tmp = (sizeof(aes_icm_ctx_t) + sizeof(cipher_t));
- pointer = (uint8_t*)crypto_alloc(tmp);
- if (pointer == NULL)
- return err_status_alloc_fail;
-
- /* set pointers */
- *c = (cipher_t *)pointer;
- (*c)->type = &aes_icm;
- (*c)->state = pointer + sizeof(cipher_t);
-
- /* increment ref_count */
- aes_icm.ref_count++;
-
- /* set key size */
- (*c)->key_len = key_len;
-
- return err_status_ok;
-}
-
-err_status_t aes_icm_alloc(cipher_t **c, int key_len, int forIsmacryp) {
- return aes_icm_alloc_ismacryp(c, key_len, 0);
-}
-
-err_status_t
-aes_icm_dealloc(cipher_t *c) {
- extern cipher_type_t aes_icm;
-
- /* zeroize entire state*/
- octet_string_set_to_zero((uint8_t *)c,
- sizeof(aes_icm_ctx_t) + sizeof(cipher_t));
-
- /* free memory */
- crypto_free(c);
-
- /* decrement ref_count */
- aes_icm.ref_count--;
-
- return err_status_ok;
-}
-
-
-/*
- * aes_icm_context_init(...) initializes the aes_icm_context
- * using the value in key[].
- *
- * the key is the secret key
- *
- * the salt is unpredictable (but not necessarily secret) data which
- * randomizes the starting point in the keystream
- */
-
-err_status_t
-aes_icm_context_init(aes_icm_ctx_t *c, const uint8_t *key) {
- v128_t tmp_key;
- int i;
-
- /* set counter and initial values to 'offset' value */
- /* FIX!!! this assumes the salt is at key + 16, and thus that the */
- /* FIX!!! cipher key length is 16! */
- for (i = 0; i < 14; i++) {
- c->counter.v8[i] = key[16 + i];
- c->offset.v8[i] = key[16 + i];
- }
-
- /* force last two octets of the offset to zero (for srtp compatibility) */
- c->offset.v8[14] = c->offset.v8[15] = 0;
- c->counter.v8[14] = c->counter.v8[15] = 0;
-
- /* set tmp_key (for alignment) */
- v128_copy_octet_string(&tmp_key, key);
-
- debug_print(mod_aes_icm,
- "key: %s", v128_hex_string(&tmp_key));
- debug_print(mod_aes_icm,
- "offset: %s", v128_hex_string(&c->offset));
-
- /* expand key */
- aes_expand_encryption_key(&tmp_key, c->expanded_key);
-
- /* indicate that the keystream_buffer is empty */
- c->bytes_in_buffer = 0;
-
- return err_status_ok;
-}
-
-/*
- * aes_icm_set_octet(c, i) sets the counter of the context which it is
- * passed so that the next octet of keystream that will be generated
- * is the ith octet
- */
-
-err_status_t
-aes_icm_set_octet(aes_icm_ctx_t *c,
- uint64_t octet_num) {
-
-#ifdef NO_64BIT_MATH
- int tail_num = low32(octet_num) & 0x0f;
- /* 64-bit right-shift 4 */
- uint64_t block_num = make64(high32(octet_num) >> 4,
- ((high32(octet_num) & 0x0f)<<(32-4)) |
- (low32(octet_num) >> 4));
-#else
- int tail_num = (int)(octet_num % 16);
- uint64_t block_num = octet_num / 16;
-#endif
-
-
- /* set counter value */
- /* FIX - There's no way this is correct */
- c->counter.v64[0] = c->offset.v64[0];
-#ifdef NO_64BIT_MATH
- c->counter.v64[0] = make64(high32(c->offset.v64[0]) ^ high32(block_num),
- low32(c->offset.v64[0]) ^ low32(block_num));
-#else
- c->counter.v64[0] = c->offset.v64[0] ^ block_num;
-#endif
-
- debug_print(mod_aes_icm,
- "set_octet: %s", v128_hex_string(&c->counter));
-
- /* fill keystream buffer, if needed */
- if (tail_num) {
- v128_copy(&c->keystream_buffer, &c->counter);
- aes_encrypt(&c->keystream_buffer, c->expanded_key);
- c->bytes_in_buffer = sizeof(v128_t);
-
- debug_print(mod_aes_icm, "counter: %s",
- v128_hex_string(&c->counter));
- debug_print(mod_aes_icm, "ciphertext: %s",
- v128_hex_string(&c->keystream_buffer));
-
- /* indicate number of bytes in keystream_buffer */
- c->bytes_in_buffer = sizeof(v128_t) - tail_num;
-
- } else {
-
- /* indicate that keystream_buffer is empty */
- c->bytes_in_buffer = 0;
- }
-
- return err_status_ok;
-}
-
-/*
- * aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
- * the offset
- */
-
-err_status_t
-aes_icm_set_iv(aes_icm_ctx_t *c, void *iv) {
- v128_t *nonce = (v128_t *) iv;
-
- debug_print(mod_aes_icm,
- "setting iv: %s", v128_hex_string(nonce));
-
- v128_xor(&c->counter, &c->offset, nonce);
-
- debug_print(mod_aes_icm,
- "set_counter: %s", v128_hex_string(&c->counter));
-
- /* indicate that the keystream_buffer is empty */
- c->bytes_in_buffer = 0;
-
- return err_status_ok;
-}
-
-
-
-/*
- * aes_icm_advance(...) refills the keystream_buffer and
- * advances the block index of the sicm_context forward by one
- *
- * this is an internal, hopefully inlined function
- */
-
-static inline void
-aes_icm_advance_ismacryp(aes_icm_ctx_t *c, uint8_t forIsmacryp) {
- /* fill buffer with new keystream */
- v128_copy(&c->keystream_buffer, &c->counter);
- aes_encrypt(&c->keystream_buffer, c->expanded_key);
- c->bytes_in_buffer = sizeof(v128_t);
-
- debug_print(mod_aes_icm, "counter: %s",
- v128_hex_string(&c->counter));
- debug_print(mod_aes_icm, "ciphertext: %s",
- v128_hex_string(&c->keystream_buffer));
-
- /* clock counter forward */
-
- if (forIsmacryp) {
- uint32_t temp;
- //alex's clock counter forward
- temp = ntohl(c->counter.v32[3]);
- c->counter.v32[3] = htonl(++temp);
- } else {
- if (!++(c->counter.v8[15]))
- ++(c->counter.v8[14]);
- }
-}
-
-inline void aes_icm_advance(aes_icm_ctx_t *c) {
- aes_icm_advance_ismacryp(c, 0);
-}
-
-
-/*e
- * icm_encrypt deals with the following cases:
- *
- * bytes_to_encr < bytes_in_buffer
- * - add keystream into data
- *
- * bytes_to_encr > bytes_in_buffer
- * - add keystream into data until keystream_buffer is depleted
- * - loop over blocks, filling keystream_buffer and then
- * adding keystream into data
- * - fill buffer then add in remaining (< 16) bytes of keystream
- */
-
-err_status_t
-aes_icm_encrypt_ismacryp(aes_icm_ctx_t *c,
- unsigned char *buf, unsigned int *enc_len,
- int forIsmacryp) {
- unsigned int bytes_to_encr = *enc_len;
- unsigned int i;
- uint32_t *b;
-
- /* check that there's enough segment left but not for ismacryp*/
- if (!forIsmacryp && (bytes_to_encr + htons(c->counter.v16[7])) > 0xffff)
- return err_status_terminus;
-
- debug_print(mod_aes_icm, "block index: %d",
- htons(c->counter.v16[7]));
- if (bytes_to_encr <= (unsigned int)c->bytes_in_buffer) {
-
- /* deal with odd case of small bytes_to_encr */
- for (i = (sizeof(v128_t) - c->bytes_in_buffer);
- i < (sizeof(v128_t) - c->bytes_in_buffer + bytes_to_encr); i++)
- {
- *buf++ ^= c->keystream_buffer.v8[i];
- }
-
- c->bytes_in_buffer -= bytes_to_encr;
-
- /* return now to avoid the main loop */
- return err_status_ok;
-
- } else {
-
- /* encrypt bytes until the remaining data is 16-byte aligned */
- for (i=(sizeof(v128_t) - c->bytes_in_buffer); i < sizeof(v128_t); i++)
- *buf++ ^= c->keystream_buffer.v8[i];
-
- bytes_to_encr -= c->bytes_in_buffer;
- c->bytes_in_buffer = 0;
-
- }
-
- /* now loop over entire 16-byte blocks of keystream */
- for (i=0; i < (bytes_to_encr/sizeof(v128_t)); i++) {
-
- /* fill buffer with new keystream */
- aes_icm_advance_ismacryp(c, forIsmacryp);
-
- /*
- * add keystream into the data buffer (this would be a lot faster
- * if we could assume 32-bit alignment!)
- */
-
-#if ALIGN_32
- b = (uint32_t *)buf;
- *b++ ^= c->keystream_buffer.v32[0];
- *b++ ^= c->keystream_buffer.v32[1];
- *b++ ^= c->keystream_buffer.v32[2];
- *b++ ^= c->keystream_buffer.v32[3];
- buf = (uint8_t *)b;
-#else
- if ((((unsigned long) buf) & 0x03) != 0) {
- *buf++ ^= c->keystream_buffer.v8[0];
- *buf++ ^= c->keystream_buffer.v8[1];
- *buf++ ^= c->keystream_buffer.v8[2];
- *buf++ ^= c->keystream_buffer.v8[3];
- *buf++ ^= c->keystream_buffer.v8[4];
- *buf++ ^= c->keystream_buffer.v8[5];
- *buf++ ^= c->keystream_buffer.v8[6];
- *buf++ ^= c->keystream_buffer.v8[7];
- *buf++ ^= c->keystream_buffer.v8[8];
- *buf++ ^= c->keystream_buffer.v8[9];
- *buf++ ^= c->keystream_buffer.v8[10];
- *buf++ ^= c->keystream_buffer.v8[11];
- *buf++ ^= c->keystream_buffer.v8[12];
- *buf++ ^= c->keystream_buffer.v8[13];
- *buf++ ^= c->keystream_buffer.v8[14];
- *buf++ ^= c->keystream_buffer.v8[15];
- } else {
- b = (uint32_t *)buf;
- *b++ ^= c->keystream_buffer.v32[0];
- *b++ ^= c->keystream_buffer.v32[1];
- *b++ ^= c->keystream_buffer.v32[2];
- *b++ ^= c->keystream_buffer.v32[3];
- buf = (uint8_t *)b;
- }
-#endif /* #if ALIGN_32 */
-
- }
-
- /* if there is a tail end of the data, process it */
- if ((bytes_to_encr & 0xf) != 0) {
-
- /* fill buffer with new keystream */
- aes_icm_advance_ismacryp(c, forIsmacryp);
-
- for (i=0; i < (bytes_to_encr & 0xf); i++)
- *buf++ ^= c->keystream_buffer.v8[i];
-
- /* reset the keystream buffer size to right value */
- c->bytes_in_buffer = sizeof(v128_t) - i;
- } else {
-
- /* no tail, so just reset the keystream buffer size to zero */
- c->bytes_in_buffer = 0;
-
- }
-
- return err_status_ok;
-}
-
-err_status_t
-aes_icm_encrypt(aes_icm_ctx_t *c, unsigned char *buf, unsigned int *enc_len) {
- return aes_icm_encrypt_ismacryp(c, buf, enc_len, 0);
-}
-
-err_status_t
-aes_icm_output(aes_icm_ctx_t *c, uint8_t *buffer, int num_octets_to_output) {
- unsigned int len = num_octets_to_output;
-
- /* zeroize the buffer */
- octet_string_set_to_zero(buffer, num_octets_to_output);
-
- /* exor keystream into buffer */
- return aes_icm_encrypt(c, buffer, &len);
-}
-
-
-char
-aes_icm_description[] = "aes integer counter mode";
-
-uint8_t aes_icm_test_case_0_key[30] = {
- 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
- 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
- 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
- 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
-};
-
-uint8_t aes_icm_test_case_0_nonce[16] = {
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-};
-
-uint8_t aes_icm_test_case_0_plaintext[32] = {
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-};
-
-uint8_t aes_icm_test_case_0_ciphertext[32] = {
- 0xe0, 0x3e, 0xad, 0x09, 0x35, 0xc9, 0x5e, 0x80,
- 0xe1, 0x66, 0xb1, 0x6d, 0xd9, 0x2b, 0x4e, 0xb4,
- 0xd2, 0x35, 0x13, 0x16, 0x2b, 0x02, 0xd0, 0xf7,
- 0x2a, 0x43, 0xa2, 0xfe, 0x4a, 0x5f, 0x97, 0xab
-};
-
-cipher_test_case_t aes_icm_test_case_0 = {
- 30, /* octets in key */
- aes_icm_test_case_0_key, /* key */
- aes_icm_test_case_0_nonce, /* packet index */
- 32, /* octets in plaintext */
- aes_icm_test_case_0_plaintext, /* plaintext */
- 32, /* octets in ciphertext */
- aes_icm_test_case_0_ciphertext, /* ciphertext */
- NULL /* pointer to next testcase */
-};
-
-
-/*
- * note: the encrypt function is identical to the decrypt function
- */
-
-cipher_type_t aes_icm = {
- (cipher_alloc_func_t) aes_icm_alloc,
- (cipher_dealloc_func_t) aes_icm_dealloc,
- (cipher_init_func_t) aes_icm_context_init,
- (cipher_encrypt_func_t) aes_icm_encrypt,
- (cipher_decrypt_func_t) aes_icm_encrypt,
- (cipher_set_iv_func_t) aes_icm_set_iv,
- (char *) aes_icm_description,
- (int) 0, /* instance count */
- (cipher_test_case_t *) &aes_icm_test_case_0,
- (debug_module_t *) &mod_aes_icm
-};
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