1 /* $OpenBSD: evp_key.c,v 1.26 2018/08/14 17:59:26 tb 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 /* should be init to zeros. */ 69 static char prompt_string[80]; 70 71 void 72 EVP_set_pw_prompt(const char *prompt) 73 { 74 if (prompt == NULL) 75 prompt_string[0] = '\0'; 76 else { 77 strlcpy(prompt_string, prompt, sizeof(prompt_string)); 78 } 79 } 80 81 char * 82 EVP_get_pw_prompt(void) 83 { 84 if (prompt_string[0] == '\0') 85 return (NULL); 86 else 87 return (prompt_string); 88 } 89 90 int 91 EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) 92 { 93 return EVP_read_pw_string_min(buf, 0, len, prompt, verify); 94 } 95 96 int 97 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 (len > BUFSIZ) 105 len = BUFSIZ; 106 /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */ 107 if (min < 0 || len - 1 < min) 108 return -1; 109 if ((prompt == NULL) && (prompt_string[0] != '\0')) 110 prompt = prompt_string; 111 ui = UI_new(); 112 if (ui == NULL) 113 return -1; 114 if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0) 115 return -1; 116 if (verify) { 117 if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, buf) 118 < 0) 119 return -1; 120 } 121 ret = UI_process(ui); 122 UI_free(ui); 123 explicit_bzero(buff, BUFSIZ); 124 return ret; 125 } 126 127 int 128 EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, 129 const unsigned char *salt, const unsigned char *data, int datal, 130 int count, unsigned char *key, unsigned char *iv) 131 { 132 EVP_MD_CTX c; 133 unsigned char md_buf[EVP_MAX_MD_SIZE]; 134 int niv, nkey, addmd = 0; 135 unsigned int mds = 0, i; 136 int rv = 0; 137 138 nkey = type->key_len; 139 niv = type->iv_len; 140 141 if ((size_t)nkey > EVP_MAX_KEY_LENGTH) { 142 EVPerror(EVP_R_BAD_KEY_LENGTH); 143 return 0; 144 } 145 if ((size_t)niv > EVP_MAX_IV_LENGTH) { 146 EVPerror(EVP_R_IV_TOO_LARGE); 147 return 0; 148 } 149 150 if (data == NULL) 151 return (nkey); 152 153 EVP_MD_CTX_init(&c); 154 for (;;) { 155 if (!EVP_DigestInit_ex(&c, md, NULL)) 156 goto err; 157 if (addmd++) 158 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds)) 159 goto err; 160 if (!EVP_DigestUpdate(&c, data, datal)) 161 goto err; 162 if (salt != NULL) 163 if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN)) 164 goto err; 165 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds)) 166 goto err; 167 168 for (i = 1; i < (unsigned int)count; i++) { 169 if (!EVP_DigestInit_ex(&c, md, NULL)) 170 goto err; 171 if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds)) 172 goto err; 173 if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds)) 174 goto err; 175 } 176 i = 0; 177 if (nkey) { 178 for (;;) { 179 if (nkey == 0) 180 break; 181 if (i == mds) 182 break; 183 if (key != NULL) 184 *(key++) = md_buf[i]; 185 nkey--; 186 i++; 187 } 188 } 189 if (niv && (i != mds)) { 190 for (;;) { 191 if (niv == 0) 192 break; 193 if (i == mds) 194 break; 195 if (iv != NULL) 196 *(iv++) = md_buf[i]; 197 niv--; 198 i++; 199 } 200 } 201 if ((nkey == 0) && (niv == 0)) 202 break; 203 } 204 rv = type->key_len; 205 206 err: 207 EVP_MD_CTX_cleanup(&c); 208 explicit_bzero(md_buf, sizeof md_buf); 209 return rv; 210 } 211