1 /* crypto/evp/evp_key.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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. */ 67 static char prompt_string[80]; 68 69 void EVP_set_pw_prompt(const char *prompt) 70 { 71 if (prompt == NULL) 72 prompt_string[0]='\0'; 73 else 74 { 75 strncpy(prompt_string,prompt,79); 76 prompt_string[79]='\0'; 77 } 78 } 79 80 char *EVP_get_pw_prompt(void) 81 { 82 if (prompt_string[0] == '\0') 83 return(NULL); 84 else 85 return(prompt_string); 86 } 87 88 /* For historical reasons, the standard function for reading passwords is 89 * in the DES library -- if someone ever wants to disable DES, 90 * this function will fail */ 91 int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) 92 { 93 int ret; 94 char buff[BUFSIZ]; 95 UI *ui; 96 97 if ((prompt == NULL) && (prompt_string[0] != '\0')) 98 prompt=prompt_string; 99 ui = UI_new(); 100 UI_add_input_string(ui,prompt,0,buf,0,(len>=BUFSIZ)?BUFSIZ-1:len); 101 if (verify) 102 UI_add_verify_string(ui,prompt,0, 103 buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf); 104 ret = UI_process(ui); 105 UI_free(ui); 106 OPENSSL_cleanse(buff,BUFSIZ); 107 return ret; 108 } 109 110 int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, 111 const unsigned char *salt, const unsigned char *data, int datal, 112 int count, unsigned char *key, unsigned char *iv) 113 { 114 EVP_MD_CTX c; 115 unsigned char md_buf[EVP_MAX_MD_SIZE]; 116 int niv,nkey,addmd=0; 117 unsigned int mds=0,i; 118 119 nkey=type->key_len; 120 niv=type->iv_len; 121 OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH); 122 OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH); 123 124 if (data == NULL) return(nkey); 125 126 EVP_MD_CTX_init(&c); 127 for (;;) 128 { 129 if (!EVP_DigestInit_ex(&c,md, NULL)) 130 return 0; 131 if (addmd++) 132 EVP_DigestUpdate(&c,&(md_buf[0]),mds); 133 EVP_DigestUpdate(&c,data,datal); 134 if (salt != NULL) 135 EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN); 136 EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds); 137 138 for (i=1; i<(unsigned int)count; i++) 139 { 140 EVP_DigestInit_ex(&c,md, NULL); 141 EVP_DigestUpdate(&c,&(md_buf[0]),mds); 142 EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds); 143 } 144 i=0; 145 if (nkey) 146 { 147 for (;;) 148 { 149 if (nkey == 0) break; 150 if (i == mds) break; 151 if (key != NULL) 152 *(key++)=md_buf[i]; 153 nkey--; 154 i++; 155 } 156 } 157 if (niv && (i != mds)) 158 { 159 for (;;) 160 { 161 if (niv == 0) break; 162 if (i == mds) break; 163 if (iv != NULL) 164 *(iv++)=md_buf[i]; 165 niv--; 166 i++; 167 } 168 } 169 if ((nkey == 0) && (niv == 0)) break; 170 } 171 EVP_MD_CTX_cleanup(&c); 172 OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE); 173 return(type->key_len); 174 } 175 176
