Home | History | Annotate | Download | only in evp
      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 	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;
    123 
    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++)
    137 			EVP_DigestUpdate(&c,&(md_buf[0]),mds);
    138 		EVP_DigestUpdate(&c,data,datal);
    139 		if (salt != NULL)
    140 			EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);
    141 		EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
    142 
    143 		for (i=1; i<(unsigned int)count; i++)
    144 			{
    145 			EVP_DigestInit_ex(&c,md, NULL);
    146 			EVP_DigestUpdate(&c,&(md_buf[0]),mds);
    147 			EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
    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 		}
    176 	EVP_MD_CTX_cleanup(&c);
    177 	OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);
    178 	return(type->key_len);
    179 	}
    180 
    181