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/* crypto/evp/evp_key.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/ui.h>
/* should be init to zeros. */
static char prompt_string[80];
void EVP_set_pw_prompt(const char *prompt)
{
if (prompt == NULL)
prompt_string[0] = '\0';
else {
strncpy(prompt_string, prompt, 79);
prompt_string[79] = '\0';
}
}
char *EVP_get_pw_prompt(void)
{
if (prompt_string[0] == '\0')
return (NULL);
else
return (prompt_string);
}
/*
* For historical reasons, the standard function for reading passwords is in
* the DES library -- if someone ever wants to disable DES, this function
* will fail
*/
int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
{
return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
}
int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
int verify)
{
int ret;
char buff[BUFSIZ];
UI *ui;
if ((prompt == NULL) && (prompt_string[0] != '\0'))
prompt = prompt_string;
ui = UI_new();
UI_add_input_string(ui, prompt, 0, buf, min,
(len >= BUFSIZ) ? BUFSIZ - 1 : len);
if (verify)
UI_add_verify_string(ui, prompt, 0,
buff, min, (len >= BUFSIZ) ? BUFSIZ - 1 : len,
buf);
ret = UI_process(ui);
UI_free(ui);
OPENSSL_cleanse(buff, BUFSIZ);
return ret;
}
int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
const unsigned char *salt, const unsigned char *data,
int datal, int count, unsigned char *key,
unsigned char *iv)
{
EVP_MD_CTX c;
unsigned char md_buf[EVP_MAX_MD_SIZE];
int niv, nkey, addmd = 0;
unsigned int mds = 0, i;
int rv = 0;
nkey = type->key_len;
niv = type->iv_len;
OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
if (data == NULL)
return (nkey);
EVP_MD_CTX_init(&c);
for (;;) {
if (!EVP_DigestInit_ex(&c, md, NULL))
return 0;
if (addmd++)
if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
goto err;
if (!EVP_DigestUpdate(&c, data, datal))
goto err;
if (salt != NULL)
if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))
goto err;
if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
goto err;
for (i = 1; i < (unsigned int)count; i++) {
if (!EVP_DigestInit_ex(&c, md, NULL))
goto err;
if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
goto err;
if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
goto err;
}
i = 0;
if (nkey) {
for (;;) {
if (nkey == 0)
break;
if (i == mds)
break;
if (key != NULL)
*(key++) = md_buf[i];
nkey--;
i++;
}
}
if (niv && (i != mds)) {
for (;;) {
if (niv == 0)
break;
if (i == mds)
break;
if (iv != NULL)
*(iv++) = md_buf[i];
niv--;
i++;
}
}
if ((nkey == 0) && (niv == 0))
break;
}
rv = type->key_len;
err:
EVP_MD_CTX_cleanup(&c);
OPENSSL_cleanse(&(md_buf[0]), EVP_MAX_MD_SIZE);
return rv;
}
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