1/* $OpenBSD: evp_key.c,v 1.36 2024/04/09 13:52:41 beck Exp $ */ 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 <string.h> 61 62#include <openssl/err.h> 63#include <openssl/evp.h> 64#include <openssl/objects.h> 65#include <openssl/ui.h> 66#include <openssl/x509.h> 67 68#include "evp_local.h" 69 70/* should be init to zeros. */ 71static char prompt_string[80]; 72 73void 74EVP_set_pw_prompt(const char *prompt) 75{ 76 if (prompt == NULL) 77 prompt_string[0] = '\0'; 78 else 79 strlcpy(prompt_string, prompt, sizeof(prompt_string)); 80} 81LCRYPTO_ALIAS(EVP_set_pw_prompt); 82 83char * 84EVP_get_pw_prompt(void) 85{ 86 if (prompt_string[0] == '\0') 87 return NULL; 88 89 return prompt_string; 90} 91LCRYPTO_ALIAS(EVP_get_pw_prompt); 92 93int 94EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) 95{ 96 return EVP_read_pw_string_min(buf, 0, len, prompt, verify); 97} 98LCRYPTO_ALIAS(EVP_read_pw_string); 99 100int 101EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt, 102 int verify) 103{ 104 UI *ui = NULL; 105 char buff[BUFSIZ]; 106 int ret = -1; 107 108 if (len > BUFSIZ) 109 len = BUFSIZ; 110 /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */ 111 if (min < 0 || len - 1 < min) 112 goto err; 113 114 if (prompt == NULL && prompt_string[0] != '\0') 115 prompt = prompt_string; 116 117 if ((ui = UI_new()) == NULL) 118 goto err; 119 if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0) 120 goto err; 121 if (verify) { 122 if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, 123 buf) < 0) 124 goto err; 125 } 126 127 ret = UI_process(ui); 128 129 err: 130 UI_free(ui); 131 explicit_bzero(buff, BUFSIZ); 132 133 return ret; 134} 135LCRYPTO_ALIAS(EVP_read_pw_string_min); 136 137int 138EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, 139 const unsigned char *salt, const unsigned char *data, int datal, 140 int count, unsigned char *key, unsigned char *iv) 141{ 142 EVP_MD_CTX *md_ctx; 143 unsigned char md_buf[EVP_MAX_MD_SIZE]; 144 int niv, nkey, addmd = 0; 145 unsigned int mds = 0, i; 146 int rv = 0; 147 148 nkey = type->key_len; 149 niv = type->iv_len; 150 151 if ((size_t)nkey > EVP_MAX_KEY_LENGTH) { 152 EVPerror(EVP_R_BAD_KEY_LENGTH); 153 return 0; 154 } 155 if ((size_t)niv > EVP_MAX_IV_LENGTH) { 156 EVPerror(EVP_R_IV_TOO_LARGE); 157 return 0; 158 } 159 160 if (data == NULL) 161 return nkey; 162 163 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 164 goto err; 165 166 for (;;) { 167 if (!EVP_DigestInit_ex(md_ctx, md, NULL)) 168 goto err; 169 if (addmd++) 170 if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds)) 171 goto err; 172 if (!EVP_DigestUpdate(md_ctx, data, datal)) 173 goto err; 174 if (salt != NULL) 175 if (!EVP_DigestUpdate(md_ctx, salt, PKCS5_SALT_LEN)) 176 goto err; 177 if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds)) 178 goto err; 179 180 for (i = 1; i < (unsigned int)count; i++) { 181 if (!EVP_DigestInit_ex(md_ctx, md, NULL)) 182 goto err; 183 if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds)) 184 goto err; 185 if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds)) 186 goto err; 187 } 188 i = 0; 189 if (nkey) { 190 for (;;) { 191 if (nkey == 0) 192 break; 193 if (i == mds) 194 break; 195 if (key != NULL) 196 *(key++) = md_buf[i]; 197 nkey--; 198 i++; 199 } 200 } 201 if (niv && (i != mds)) { 202 for (;;) { 203 if (niv == 0) 204 break; 205 if (i == mds) 206 break; 207 if (iv != NULL) 208 *(iv++) = md_buf[i]; 209 niv--; 210 i++; 211 } 212 } 213 if ((nkey == 0) && (niv == 0)) 214 break; 215 } 216 rv = type->key_len; 217 218err: 219 EVP_MD_CTX_free(md_ctx); 220 explicit_bzero(md_buf, sizeof md_buf); 221 return rv; 222} 223LCRYPTO_ALIAS(EVP_BytesToKey); 224