crypto/evp/evp_key.c

   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(char *prompt)
  70         {
  71         if (prompt == NULL)
  72                 prompt_string[0]='\0';
  73         else
  74                 strncpy(prompt_string,prompt,79);
  75         }
  76
  77 char *EVP_get_pw_prompt(void)
  78         {
  79         if (prompt_string[0] == '\0')
  80                 return(NULL);
  81         else
  82                 return(prompt_string);
  83         }
  84
  85 /* For historical reasons, the standard function for reading passwords is
  86  * in the DES library -- if someone ever wants to disable DES,
  87  * this function will fail */
  88 int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
  89         {
  90         int ret;
  91         char buff[BUFSIZ];
  92         UI *ui;
  93
  94         if ((prompt == NULL) && (prompt_string[0] != '\0'))
  95                 prompt=prompt_string;
  96         ui = UI_new();
  97         UI_add_input_string(ui,prompt,0,buf,0,(len>=BUFSIZ)?BUFSIZ-1:len);
  98         if (verify)
  99                 UI_add_verify_string(ui,prompt,0,
 100                         buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf);
 101         ret = UI_process(ui);
 102         UI_free(ui);
 103         memset(buff,0,BUFSIZ);
 104         return ret;
 105         }
 106
 107 int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
 108              const unsigned char *salt, const unsigned char *data, int datal,
 109              int count, unsigned char *key, unsigned char *iv)
 110         {
 111         EVP_MD_CTX c;
 112         unsigned char md_buf[EVP_MAX_MD_SIZE];
 113         int niv,nkey,addmd=0;
 114         unsigned int mds=0,i;
 115
 116         nkey=type->key_len;
 117         niv=type->iv_len;
 118
 119         if (data == NULL) return(nkey);
 120
 121         for (;;)
 122                 {
 123                 EVP_DigestInit(&c,md);
 124                 if (addmd++)
 125                         EVP_DigestUpdate(&c,&(md_buf[0]),mds);
 126                 EVP_DigestUpdate(&c,data,datal);
 127                 if (salt != NULL)
 128                         EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);
 129                 EVP_DigestFinal(&c,&(md_buf[0]),&mds);
 130
 131                 for (i=1; i<(unsigned int)count; i++)
 132                         {
 133                         EVP_DigestInit(&c,md);
 134                         EVP_DigestUpdate(&c,&(md_buf[0]),mds);
 135                         EVP_DigestFinal(&c,&(md_buf[0]),&mds);
 136                         }
 137                 i=0;
 138                 if (nkey)
 139                         {
 140                         for (;;)
 141                                 {
 142                                 if (nkey == 0) break;
 143                                 if (i == mds) break;
 144                                 if (key != NULL)
 145                                         *(key++)=md_buf[i];
 146                                 nkey--;
 147                                 i++;
 148                                 }
 149                         }
 150                 if (niv && (i != mds))
 151                         {
 152                         for (;;)
 153                                 {
 154                                 if (niv == 0) break;
 155                                 if (i == mds) break;
 156                                 if (iv != NULL)
 157                                         *(iv++)=md_buf[i];
 158                                 niv--;
 159                                 i++;
 160                                 }
 161                         }
 162                 if ((nkey == 0) && (niv == 0)) break;
 163                 }
 164         memset(&c,0,sizeof(c));
 165         memset(&(md_buf[0]),0,EVP_MAX_MD_SIZE);
 166         return(type->key_len);
 167         }
 168