1/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 2 * project 1999. 3 */ 4/* ==================================================================== 5 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing@OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay@cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh@cryptsoft.com). */ 55 56#include <openssl/evp.h> 57 58#include <openssl/hmac.h> 59 60 61int PKCS5_PBKDF2_HMAC(const char *password, int password_len, 62 const uint8_t *salt, size_t salt_len, unsigned iterations, 63 const EVP_MD *digest, size_t key_len, uint8_t *out_key) { 64 uint8_t digest_tmp[EVP_MAX_MD_SIZE], *p, itmp[4]; 65 size_t cplen, mdlen, tkeylen, k; 66 unsigned j; 67 uint32_t i = 1; 68 HMAC_CTX hctx_tpl, hctx; 69 70 mdlen = EVP_MD_size(digest); 71 HMAC_CTX_init(&hctx_tpl); 72 p = out_key; 73 tkeylen = key_len; 74 if (password == NULL) { 75 password_len = 0; 76 } else if (password_len == -1) { 77 /* TODO(fork): remove this hack. The OpenSSL code took the strlen when the 78 * length is given as -1. */ 79 password_len = strlen(password); 80 } 81 if (!HMAC_Init_ex(&hctx_tpl, password, password_len, digest, NULL)) { 82 HMAC_CTX_cleanup(&hctx_tpl); 83 return 0; 84 } 85 while (tkeylen) { 86 if (tkeylen > mdlen) { 87 cplen = mdlen; 88 } else { 89 cplen = tkeylen; 90 } 91 /* We are unlikely to ever use more than 256 blocks (5120 bits!) 92 * but just in case... */ 93 itmp[0] = (uint8_t)((i >> 24) & 0xff); 94 itmp[1] = (uint8_t)((i >> 16) & 0xff); 95 itmp[2] = (uint8_t)((i >> 8) & 0xff); 96 itmp[3] = (uint8_t)(i & 0xff); 97 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) { 98 HMAC_CTX_cleanup(&hctx_tpl); 99 return 0; 100 } 101 if (!HMAC_Update(&hctx, salt, salt_len) || 102 !HMAC_Update(&hctx, itmp, 4) || 103 !HMAC_Final(&hctx, digest_tmp, NULL)) { 104 HMAC_CTX_cleanup(&hctx_tpl); 105 HMAC_CTX_cleanup(&hctx); 106 return 0; 107 } 108 HMAC_CTX_cleanup(&hctx); 109 memcpy(p, digest_tmp, cplen); 110 for (j = 1; j < iterations; j++) { 111 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) { 112 HMAC_CTX_cleanup(&hctx_tpl); 113 return 0; 114 } 115 if (!HMAC_Update(&hctx, digest_tmp, mdlen) || 116 !HMAC_Final(&hctx, digest_tmp, NULL)) { 117 HMAC_CTX_cleanup(&hctx_tpl); 118 HMAC_CTX_cleanup(&hctx); 119 return 0; 120 } 121 HMAC_CTX_cleanup(&hctx); 122 for (k = 0; k < cplen; k++) { 123 p[k] ^= digest_tmp[k]; 124 } 125 } 126 tkeylen -= cplen; 127 i++; 128 p += cplen; 129 } 130 HMAC_CTX_cleanup(&hctx_tpl); 131 return 1; 132} 133 134int PKCS5_PBKDF2_HMAC_SHA1(const char *password, int password_len, 135 const uint8_t *salt, size_t salt_len, 136 unsigned iterations, size_t key_len, 137 uint8_t *out_key) { 138 return PKCS5_PBKDF2_HMAC(password, password_len, salt, salt_len, iterations, 139 EVP_sha1(), key_len, out_key); 140} 141