|
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152 |
- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/cipher.h>
-
- #include <assert.h>
-
- #include <openssl/digest.h>
- #include <openssl/mem.h>
-
-
- #define PKCS5_SALT_LEN 8
-
- int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
- const uint8_t *salt, const uint8_t *data, size_t data_len,
- unsigned count, uint8_t *key, uint8_t *iv) {
- EVP_MD_CTX c;
- uint8_t md_buf[EVP_MAX_MD_SIZE];
- unsigned niv, nkey, addmd = 0;
- unsigned mds = 0, i;
- int rv = 0;
-
- nkey = type->key_len;
- niv = type->iv_len;
-
- assert(nkey <= EVP_MAX_KEY_LENGTH);
- assert(niv <= EVP_MAX_IV_LENGTH);
-
- if (data == NULL) {
- return nkey;
- }
-
- EVP_MD_CTX_init(&c);
- for (;;) {
- if (!EVP_DigestInit_ex(&c, md, NULL)) {
- return 0;
- }
- if (addmd++) {
- if (!EVP_DigestUpdate(&c, md_buf, mds)) {
- goto err;
- }
- }
- if (!EVP_DigestUpdate(&c, data, data_len)) {
- goto err;
- }
- if (salt != NULL) {
- if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN)) {
- goto err;
- }
- }
- if (!EVP_DigestFinal_ex(&c, md_buf, &mds)) {
- goto err;
- }
-
- for (i = 1; i < count; i++) {
- if (!EVP_DigestInit_ex(&c, md, NULL) ||
- !EVP_DigestUpdate(&c, md_buf, mds) ||
- !EVP_DigestFinal_ex(&c, md_buf, &mds)) {
- goto err;
- }
- }
-
- i = 0;
- if (nkey) {
- for (;;) {
- if (nkey == 0 || i == mds) {
- break;
- }
- if (key != NULL) {
- *(key++) = md_buf[i];
- }
- nkey--;
- i++;
- }
- }
-
- if (niv && i != mds) {
- for (;;) {
- if (niv == 0 || i == mds) {
- break;
- }
- if (iv != NULL) {
- *(iv++) = md_buf[i];
- }
- niv--;
- i++;
- }
- }
- if (nkey == 0 && niv == 0) {
- break;
- }
- }
- rv = type->key_len;
-
- err:
- EVP_MD_CTX_cleanup(&c);
- OPENSSL_cleanse(md_buf, EVP_MAX_MD_SIZE);
- return rv;
- }
|