Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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. */ |
| 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 | return EVP_read_pw_string_min(buf, 0, len, prompt, verify); |
| 94 | } |
| 95 | |
| 96 | int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt, int verify) |
| 97 | { |
| 98 | int ret; |
| 99 | char buff[BUFSIZ]; |
| 100 | UI *ui; |
| 101 | |
| 102 | if ((prompt == NULL) && (prompt_string[0] != '\0')) |
| 103 | prompt=prompt_string; |
| 104 | ui = UI_new(); |
| 105 | UI_add_input_string(ui,prompt,0,buf,min,(len>=BUFSIZ)?BUFSIZ-1:len); |
| 106 | if (verify) |
| 107 | UI_add_verify_string(ui,prompt,0, |
| 108 | buff,min,(len>=BUFSIZ)?BUFSIZ-1:len,buf); |
| 109 | ret = UI_process(ui); |
| 110 | UI_free(ui); |
| 111 | OPENSSL_cleanse(buff,BUFSIZ); |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, |
| 116 | const unsigned char *salt, const unsigned char *data, int datal, |
| 117 | int count, unsigned char *key, unsigned char *iv) |
| 118 | { |
| 119 | EVP_MD_CTX c; |
| 120 | unsigned char md_buf[EVP_MAX_MD_SIZE]; |
| 121 | int niv,nkey,addmd=0; |
| 122 | unsigned int mds=0,i; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 123 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 124 | nkey=type->key_len; |
| 125 | niv=type->iv_len; |
| 126 | OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH); |
| 127 | OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH); |
| 128 | |
| 129 | if (data == NULL) return(nkey); |
| 130 | |
| 131 | EVP_MD_CTX_init(&c); |
| 132 | for (;;) |
| 133 | { |
| 134 | if (!EVP_DigestInit_ex(&c,md, NULL)) |
| 135 | return 0; |
| 136 | if (addmd++) |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 137 | EVP_DigestUpdate(&c,&(md_buf[0]),mds); |
| 138 | EVP_DigestUpdate(&c,data,datal); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 139 | if (salt != NULL) |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 140 | EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN); |
| 141 | EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 142 | |
| 143 | for (i=1; i<(unsigned int)count; i++) |
| 144 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 145 | EVP_DigestInit_ex(&c,md, NULL); |
| 146 | EVP_DigestUpdate(&c,&(md_buf[0]),mds); |
| 147 | EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 148 | } |
| 149 | i=0; |
| 150 | if (nkey) |
| 151 | { |
| 152 | for (;;) |
| 153 | { |
| 154 | if (nkey == 0) break; |
| 155 | if (i == mds) break; |
| 156 | if (key != NULL) |
| 157 | *(key++)=md_buf[i]; |
| 158 | nkey--; |
| 159 | i++; |
| 160 | } |
| 161 | } |
| 162 | if (niv && (i != mds)) |
| 163 | { |
| 164 | for (;;) |
| 165 | { |
| 166 | if (niv == 0) break; |
| 167 | if (i == mds) break; |
| 168 | if (iv != NULL) |
| 169 | *(iv++)=md_buf[i]; |
| 170 | niv--; |
| 171 | i++; |
| 172 | } |
| 173 | } |
| 174 | if ((nkey == 0) && (niv == 0)) break; |
| 175 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 176 | EVP_MD_CTX_cleanup(&c); |
| 177 | OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 178 | return(type->key_len); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 179 | } |
| 180 | |