evp_key.c revision 280304
1/* crypto/evp/evp_key.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/x509.h> 62#include <openssl/objects.h> 63#include <openssl/evp.h> 64#include <openssl/ui.h> 65 66/* should be init to zeros. */ 67static char prompt_string[80]; 68 69void EVP_set_pw_prompt(const char *prompt) 70{ 71 if (prompt == NULL) 72 prompt_string[0] = '\0'; 73 else { 74 strncpy(prompt_string, prompt, 79); 75 prompt_string[79] = '\0'; 76 } 77} 78 79char *EVP_get_pw_prompt(void) 80{ 81 if (prompt_string[0] == '\0') 82 return (NULL); 83 else 84 return (prompt_string); 85} 86 87/* 88 * For historical reasons, the standard function for reading passwords is in 89 * the DES library -- if someone ever wants to disable DES, this function 90 * will fail 91 */ 92int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) 93{ 94 return EVP_read_pw_string_min(buf, 0, len, prompt, verify); 95} 96 97int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt, 98 int verify) 99{ 100 int ret; 101 char buff[BUFSIZ]; 102 UI *ui; 103 104 if ((prompt == NULL) && (prompt_string[0] != '\0')) 105 prompt = prompt_string; 106 ui = UI_new(); 107 UI_add_input_string(ui, prompt, 0, buf, min, 108 (len >= BUFSIZ) ? BUFSIZ - 1 : len); 109 if (verify) 110 UI_add_verify_string(ui, prompt, 0, 111 buff, min, (len >= BUFSIZ) ? BUFSIZ - 1 : len, 112 buf); 113 ret = UI_process(ui); 114 UI_free(ui); 115 OPENSSL_cleanse(buff, BUFSIZ); 116 return ret; 117} 118 119int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, 120 const unsigned char *salt, const unsigned char *data, 121 int datal, int count, unsigned char *key, 122 unsigned char *iv) 123{ 124 EVP_MD_CTX c; 125 unsigned char md_buf[EVP_MAX_MD_SIZE]; 126 int niv, nkey, addmd = 0; 127 unsigned int mds = 0, i; 128 int rv = 0; 129 nkey = type->key_len; 130 niv = type->iv_len; 131 OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH); 132 OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH); 133 134 if (data == NULL) 135 return (nkey); 136 137 EVP_MD_CTX_init(&c); 138 for (;;) { 139 if (!EVP_DigestInit_ex(&c, md, NULL)) 140 return 0; 141 if (addmd++) 142 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds)) 143 goto err; 144 if (!EVP_DigestUpdate(&c, data, datal)) 145 goto err; 146 if (salt != NULL) 147 if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN)) 148 goto err; 149 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds)) 150 goto err; 151 152 for (i = 1; i < (unsigned int)count; i++) { 153 if (!EVP_DigestInit_ex(&c, md, NULL)) 154 goto err; 155 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds)) 156 goto err; 157 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds)) 158 goto err; 159 } 160 i = 0; 161 if (nkey) { 162 for (;;) { 163 if (nkey == 0) 164 break; 165 if (i == mds) 166 break; 167 if (key != NULL) 168 *(key++) = md_buf[i]; 169 nkey--; 170 i++; 171 } 172 } 173 if (niv && (i != mds)) { 174 for (;;) { 175 if (niv == 0) 176 break; 177 if (i == mds) 178 break; 179 if (iv != NULL) 180 *(iv++) = md_buf[i]; 181 niv--; 182 i++; 183 } 184 } 185 if ((nkey == 0) && (niv == 0)) 186 break; 187 } 188 rv = type->key_len; 189 err: 190 EVP_MD_CTX_cleanup(&c); 191 OPENSSL_cleanse(&(md_buf[0]), EVP_MAX_MD_SIZE); 192 return rv; 193} 194