/* p12_key.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/pkcs12.h>
#include <openssl/bn.h>
/* Uncomment out this line to get debugging info about key generation */
/*#define DEBUG_KEYGEN*/
#ifdef DEBUG_KEYGEN
#include <openssl/bio.h>
extern BIO *bio_err;
void h__dump (unsigned char *p, int len);
#endif
/* PKCS12 compatible key/IV generation */
#ifndef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#endif
int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
int saltlen, int id, int iter, int n, unsigned char *out,
const EVP_MD *md_type)
{
int ret;
unsigned char *unipass;
int uniplen;
if(!pass) {
unipass = NULL;
uniplen = 0;
} else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
return 0;
}
ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
id, iter, n, out, md_type);
if (ret <= 0)
return 0;
if(unipass) {
OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
OPENSSL_free(unipass);
}
return ret;
}
int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
int saltlen, int id, int iter, int n, unsigned char *out,
const EVP_MD *md_type)
{
unsigned char *B, *D, *I, *p, *Ai;
int Slen, Plen, Ilen, Ijlen;
int i, j, u, v;
int ret = 0;
BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */
EVP_MD_CTX ctx;
#ifdef DEBUG_KEYGEN
unsigned char *tmpout = out;
int tmpn = n;
#endif
#if 0
if (!pass) {
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
#endif
EVP_MD_CTX_init(&ctx);
#ifdef DEBUG_KEYGEN
fprintf(stderr, "KEYGEN DEBUG\n");
fprintf(stderr, "ID %d, ITER %d\n", id, iter);
fprintf(stderr, "Password (length %d):\n", passlen);
h__dump(pass, passlen);
fprintf(stderr, "Salt (length %d):\n", saltlen);
h__dump(salt, saltlen);
#endif
v = EVP_MD_block_size (md_type);
u = EVP_MD_size (md_type);
if (u < 0)
return 0;
D = OPENSSL_malloc (v);
Ai = OPENSSL_malloc (u);
B = OPENSSL_malloc (v + 1);
Slen = v * ((saltlen+v-1)/v);
if(passlen) Plen = v * ((passlen+v-1)/v);
else Plen = 0;
Ilen = Slen + Plen;
I = OPENSSL_malloc (Ilen);
Ij = BN_new();
Bpl1 = BN_new();
if (!D || !Ai || !B || !I || !Ij || !Bpl1)
goto err;
for (i = 0; i < v; i++) D[i] = id;
p = I;
for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
for (;;) {
if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
|| !EVP_DigestUpdate(&ctx, D, v)
|| !EVP_DigestUpdate(&ctx, I, Ilen)
|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
goto err;
for (j = 1; j < iter; j++) {
if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
|| !EVP_DigestUpdate(&ctx, Ai, u)
|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
goto err;
}
memcpy (out, Ai, min (n, u));
if (u >= n) {
#ifdef DEBUG_KEYGEN
fprintf(stderr, "Output KEY (length %d)\n", tmpn);
h__dump(tmpout, tmpn);
#endif
ret = 1;
goto end;
}
n -= u;
out += u;
for (j = 0; j < v; j++) B[j] = Ai[j % u];
/* Work out B + 1 first then can use B as tmp space */
if (!BN_bin2bn (B, v, Bpl1)) goto err;
if (!BN_add_word (Bpl1, 1)) goto err;
for (j = 0; j < Ilen ; j+=v) {
if (!BN_bin2bn (I + j, v, Ij)) goto err;
if (!BN_add (Ij, Ij, Bpl1)) goto err;
BN_bn2bin (Ij, B);
Ijlen = BN_num_bytes (Ij);
/* If more than 2^(v*8) - 1 cut off MSB */
if (Ijlen > v) {
BN_bn2bin (Ij, B);
memcpy (I + j, B + 1, v);
#ifndef PKCS12_BROKEN_KEYGEN
/* If less than v bytes pad with zeroes */
} else if (Ijlen < v) {
memset(I + j, 0, v - Ijlen);
BN_bn2bin(Ij, I + j + v - Ijlen);
#endif
} else BN_bn2bin (Ij, I + j);
}
}
err:
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
end:
OPENSSL_free (Ai);
OPENSSL_free (B);
OPENSSL_free (D);
OPENSSL_free (I);
BN_free (Ij);
BN_free (Bpl1);
EVP_MD_CTX_cleanup(&ctx);
return ret;
}
#ifdef DEBUG_KEYGEN
void h__dump (unsigned char *p, int len)
{
for (; len --; p++) fprintf(stderr, "%02X", *p);
fprintf(stderr, "\n");
}
#endif