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- /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
- * project 1999.
- */
- /* ====================================================================
- * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
- *
- * 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 above 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 acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED 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 OpenSSL PROJECT OR
- * ITS 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.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com). */
-
- #include <openssl/evp.h>
-
- #include <string.h>
-
- #include <openssl/hmac.h>
-
-
- int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len,
- const uint8_t *salt, size_t salt_len, unsigned iterations,
- const EVP_MD *digest, size_t key_len, uint8_t *out_key) {
- uint8_t digest_tmp[EVP_MAX_MD_SIZE], *p, itmp[4];
- size_t cplen, mdlen, tkeylen, k;
- unsigned j;
- uint32_t i = 1;
- HMAC_CTX hctx_tpl, hctx;
-
- mdlen = EVP_MD_size(digest);
- HMAC_CTX_init(&hctx_tpl);
- p = out_key;
- tkeylen = key_len;
- if (!HMAC_Init_ex(&hctx_tpl, password, password_len, digest, NULL)) {
- HMAC_CTX_cleanup(&hctx_tpl);
- return 0;
- }
- while (tkeylen) {
- if (tkeylen > mdlen) {
- cplen = mdlen;
- } else {
- cplen = tkeylen;
- }
- /* We are unlikely to ever use more than 256 blocks (5120 bits!)
- * but just in case... */
- itmp[0] = (uint8_t)((i >> 24) & 0xff);
- itmp[1] = (uint8_t)((i >> 16) & 0xff);
- itmp[2] = (uint8_t)((i >> 8) & 0xff);
- itmp[3] = (uint8_t)(i & 0xff);
- if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
- HMAC_CTX_cleanup(&hctx_tpl);
- return 0;
- }
- if (!HMAC_Update(&hctx, salt, salt_len) ||
- !HMAC_Update(&hctx, itmp, 4) ||
- !HMAC_Final(&hctx, digest_tmp, NULL)) {
- HMAC_CTX_cleanup(&hctx_tpl);
- HMAC_CTX_cleanup(&hctx);
- return 0;
- }
- HMAC_CTX_cleanup(&hctx);
- memcpy(p, digest_tmp, cplen);
- for (j = 1; j < iterations; j++) {
- if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
- HMAC_CTX_cleanup(&hctx_tpl);
- return 0;
- }
- if (!HMAC_Update(&hctx, digest_tmp, mdlen) ||
- !HMAC_Final(&hctx, digest_tmp, NULL)) {
- HMAC_CTX_cleanup(&hctx_tpl);
- HMAC_CTX_cleanup(&hctx);
- return 0;
- }
- HMAC_CTX_cleanup(&hctx);
- for (k = 0; k < cplen; k++) {
- p[k] ^= digest_tmp[k];
- }
- }
- tkeylen -= cplen;
- i++;
- p += cplen;
- }
- HMAC_CTX_cleanup(&hctx_tpl);
- return 1;
- }
-
- int PKCS5_PBKDF2_HMAC_SHA1(const char *password, size_t password_len,
- const uint8_t *salt, size_t salt_len,
- unsigned iterations, size_t key_len,
- uint8_t *out_key) {
- return PKCS5_PBKDF2_HMAC(password, password_len, salt, salt_len, iterations,
- EVP_sha1(), key_len, out_key);
- }
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