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-rw-r--r--srtp/crypto/cipher/cipher.c407
1 files changed, 0 insertions, 407 deletions
diff --git a/srtp/crypto/cipher/cipher.c b/srtp/crypto/cipher/cipher.c
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index 573c5e2..0000000
--- a/srtp/crypto/cipher/cipher.c
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-/*
- * cipher.c
- *
- * cipher meta-functions
- *
- * 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 "cipher.h"
-#include "rand_source.h" /* used in invertibiltiy tests */
-#include "alloc.h" /* for crypto_alloc(), crypto_free() */
-
-debug_module_t mod_cipher = {
- 0, /* debugging is off by default */
- "cipher" /* printable module name */
-};
-
-err_status_t
-cipher_output(cipher_t *c, uint8_t *buffer, int num_octets_to_output) {
-
- /* zeroize the buffer */
- octet_string_set_to_zero(buffer, num_octets_to_output);
-
- /* exor keystream into buffer */
- return cipher_encrypt(c, buffer, (unsigned int *) &num_octets_to_output);
-}
-
-/* some bookkeeping functions */
-
-int
-cipher_get_key_length(const cipher_t *c) {
- return c->key_len;
-}
-
-/*
- * cipher_type_self_test(ct) tests a cipher of type ct against test cases
- * provided in an array of values of key, salt, xtd_seq_num_t,
- * plaintext, and ciphertext that is known to be good
- */
-
-#define SELF_TEST_BUF_OCTETS 128
-#define NUM_RAND_TESTS 128
-#define MAX_KEY_LEN 64
-
-err_status_t
-cipher_type_self_test(const cipher_type_t *ct) {
- const cipher_test_case_t *test_case = ct->test_data;
- cipher_t *c;
- err_status_t status;
- uint8_t buffer[SELF_TEST_BUF_OCTETS];
- uint8_t buffer2[SELF_TEST_BUF_OCTETS];
- unsigned int len;
- int i, j, case_num = 0;
-
- debug_print(mod_cipher, "running self-test for cipher %s",
- ct->description);
-
- /*
- * check to make sure that we have at least one test case, and
- * return an error if we don't - we need to be paranoid here
- */
- if (test_case == NULL)
- return err_status_cant_check;
-
- /*
- * loop over all test cases, perform known-answer tests of both the
- * encryption and decryption functions
- */
- while (test_case != NULL) {
-
- /* allocate cipher */
- status = cipher_type_alloc(ct, &c, test_case->key_length_octets);
- if (status)
- return status;
-
- /*
- * test the encrypt function
- */
- debug_print(mod_cipher, "testing encryption", NULL);
-
- /* initialize cipher */
- status = cipher_init(c, test_case->key, direction_encrypt);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* copy plaintext into test buffer */
- if (test_case->ciphertext_length_octets > SELF_TEST_BUF_OCTETS) {
- cipher_dealloc(c);
- return err_status_bad_param;
- }
- for (i=0; i < test_case->plaintext_length_octets; i++)
- buffer[i] = test_case->plaintext[i];
-
- debug_print(mod_cipher, "plaintext: %s",
- octet_string_hex_string(buffer,
- test_case->plaintext_length_octets));
-
- /* set the initialization vector */
- status = cipher_set_iv(c, test_case->idx);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* encrypt */
- len = test_case->plaintext_length_octets;
- status = cipher_encrypt(c, buffer, &len);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- debug_print(mod_cipher, "ciphertext: %s",
- octet_string_hex_string(buffer,
- test_case->ciphertext_length_octets));
-
- /* compare the resulting ciphertext with that in the test case */
- if (len != test_case->ciphertext_length_octets)
- return err_status_algo_fail;
- status = err_status_ok;
- for (i=0; i < test_case->ciphertext_length_octets; i++)
- if (buffer[i] != test_case->ciphertext[i]) {
- status = err_status_algo_fail;
- debug_print(mod_cipher, "test case %d failed", case_num);
- debug_print(mod_cipher, "(failure at byte %d)", i);
- break;
- }
- if (status) {
-
- debug_print(mod_cipher, "c computed: %s",
- octet_string_hex_string(buffer,
- 2*test_case->plaintext_length_octets));
- debug_print(mod_cipher, "c expected: %s",
- octet_string_hex_string(test_case->ciphertext,
- 2*test_case->plaintext_length_octets));
-
- cipher_dealloc(c);
- return err_status_algo_fail;
- }
-
- /*
- * test the decrypt function
- */
- debug_print(mod_cipher, "testing decryption", NULL);
-
- /* re-initialize cipher for decryption */
- status = cipher_init(c, test_case->key, direction_decrypt);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* copy ciphertext into test buffer */
- if (test_case->ciphertext_length_octets > SELF_TEST_BUF_OCTETS) {
- cipher_dealloc(c);
- return err_status_bad_param;
- }
- for (i=0; i < test_case->ciphertext_length_octets; i++)
- buffer[i] = test_case->ciphertext[i];
-
- debug_print(mod_cipher, "ciphertext: %s",
- octet_string_hex_string(buffer,
- test_case->plaintext_length_octets));
-
- /* set the initialization vector */
- status = cipher_set_iv(c, test_case->idx);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* decrypt */
- len = test_case->ciphertext_length_octets;
- status = cipher_decrypt(c, buffer, &len);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- debug_print(mod_cipher, "plaintext: %s",
- octet_string_hex_string(buffer,
- test_case->plaintext_length_octets));
-
- /* compare the resulting plaintext with that in the test case */
- if (len != test_case->plaintext_length_octets)
- return err_status_algo_fail;
- status = err_status_ok;
- for (i=0; i < test_case->plaintext_length_octets; i++)
- if (buffer[i] != test_case->plaintext[i]) {
- status = err_status_algo_fail;
- debug_print(mod_cipher, "test case %d failed", case_num);
- debug_print(mod_cipher, "(failure at byte %d)", i);
- }
- if (status) {
-
- debug_print(mod_cipher, "p computed: %s",
- octet_string_hex_string(buffer,
- 2*test_case->plaintext_length_octets));
- debug_print(mod_cipher, "p expected: %s",
- octet_string_hex_string(test_case->plaintext,
- 2*test_case->plaintext_length_octets));
-
- cipher_dealloc(c);
- return err_status_algo_fail;
- }
-
- /* deallocate the cipher */
- status = cipher_dealloc(c);
- if (status)
- return status;
-
- /*
- * the cipher passed the test case, so move on to the next test
- * case in the list; if NULL, we'l proceed to the next test
- */
- test_case = test_case->next_test_case;
- ++case_num;
- }
-
- /* now run some random invertibility tests */
-
- /* allocate cipher, using paramaters from the first test case */
- test_case = ct->test_data;
- status = cipher_type_alloc(ct, &c, test_case->key_length_octets);
- if (status)
- return status;
-
- rand_source_init();
-
- for (j=0; j < NUM_RAND_TESTS; j++) {
- unsigned length;
- int plaintext_len;
- uint8_t key[MAX_KEY_LEN];
- uint8_t iv[MAX_KEY_LEN];
-
- /* choose a length at random (leaving room for IV and padding) */
- length = rand() % (SELF_TEST_BUF_OCTETS - 64);
- debug_print(mod_cipher, "random plaintext length %d\n", length);
- status = rand_source_get_octet_string(buffer, length);
- if (status) return status;
-
- debug_print(mod_cipher, "plaintext: %s",
- octet_string_hex_string(buffer, length));
-
- /* copy plaintext into second buffer */
- for (i=0; (unsigned int)i < length; i++)
- buffer2[i] = buffer[i];
-
- /* choose a key at random */
- if (test_case->key_length_octets > MAX_KEY_LEN)
- return err_status_cant_check;
- status = rand_source_get_octet_string(key, test_case->key_length_octets);
- if (status) return status;
-
- /* chose a random initialization vector */
- status = rand_source_get_octet_string(iv, MAX_KEY_LEN);
- if (status) return status;
-
- /* initialize cipher */
- status = cipher_init(c, key, direction_encrypt);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* set initialization vector */
- status = cipher_set_iv(c, test_case->idx);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- /* encrypt buffer with cipher */
- plaintext_len = length;
- status = cipher_encrypt(c, buffer, &length);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
- debug_print(mod_cipher, "ciphertext: %s",
- octet_string_hex_string(buffer, length));
-
- /*
- * re-initialize cipher for decryption, re-set the iv, then
- * decrypt the ciphertext
- */
- status = cipher_init(c, key, direction_decrypt);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
- status = cipher_set_iv(c, test_case->idx);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
- status = cipher_decrypt(c, buffer, &length);
- if (status) {
- cipher_dealloc(c);
- return status;
- }
-
- debug_print(mod_cipher, "plaintext[2]: %s",
- octet_string_hex_string(buffer, length));
-
- /* compare the resulting plaintext with the original one */
- if (length != plaintext_len)
- return err_status_algo_fail;
- status = err_status_ok;
- for (i=0; i < plaintext_len; i++)
- if (buffer[i] != buffer2[i]) {
- status = err_status_algo_fail;
- debug_print(mod_cipher, "random test case %d failed", case_num);
- debug_print(mod_cipher, "(failure at byte %d)", i);
- }
- if (status) {
- cipher_dealloc(c);
- return err_status_algo_fail;
- }
-
- }
-
- return err_status_ok;
-}
-
-
-/*
- * cipher_bits_per_second(c, l, t) computes (an estimate of) the
- * number of bits that a cipher implementation can encrypt in a second
- *
- * c is a cipher (which MUST be allocated and initialized already), l
- * is the length in octets of the test data to be encrypted, and t is
- * the number of trials
- *
- * if an error is encountered, the value 0 is returned
- */
-
-uint64_t
-cipher_bits_per_second(cipher_t *c, int octets_in_buffer, int num_trials) {
- int i;
- v128_t nonce;
- clock_t timer;
- unsigned char *enc_buf;
- unsigned int len = octets_in_buffer;
-
- enc_buf = (unsigned char*) crypto_alloc(octets_in_buffer);
- if (enc_buf == NULL)
- return 0; /* indicate bad parameters by returning null */
-
- /* time repeated trials */
- v128_set_to_zero(&nonce);
- timer = clock();
- for(i=0; i < num_trials; i++, nonce.v32[3] = i) {
- cipher_set_iv(c, &nonce);
- cipher_encrypt(c, enc_buf, &len);
- }
- timer = clock() - timer;
-
- crypto_free(enc_buf);
-
- if (timer == 0) {
- /* Too fast! */
- return 0;
- }
-
- return (uint64_t)CLOCKS_PER_SEC * num_trials * 8 * octets_in_buffer / timer;
-}
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