sl@0: /* p12_key.c */
sl@0: /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
sl@0:  * project 1999.
sl@0:  */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    licensing@OpenSSL.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/pkcs12.h>
sl@0: #include <openssl/bn.h>
sl@0: 
sl@0: /* Uncomment out this line to get debugging info about key generation */
sl@0: /*#define DEBUG_KEYGEN*/
sl@0: #ifdef DEBUG_KEYGEN
sl@0: #include <openssl/bio.h>
sl@0: extern BIO *bio_err;
sl@0: void h__dump (unsigned char *p, int len);
sl@0: #endif
sl@0: 
sl@0: /* PKCS12 compatible key/IV generation */
sl@0: #ifndef min
sl@0: #define min(a,b) ((a) < (b) ? (a) : (b))
sl@0: #endif
sl@0: 
sl@0: EXPORT_C int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
sl@0: 	     int saltlen, int id, int iter, int n, unsigned char *out,
sl@0: 	     const EVP_MD *md_type)
sl@0: {
sl@0: 	int ret;
sl@0: 	unsigned char *unipass;
sl@0: 	int uniplen;
sl@0: 	if(!pass) {
sl@0: 		unipass = NULL;
sl@0: 		uniplen = 0;
sl@0: 	} else if (!asc2uni(pass, passlen, &unipass, &uniplen)) {
sl@0: 		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC,ERR_R_MALLOC_FAILURE);
sl@0: 		return 0;
sl@0: 	}
sl@0: 	ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
sl@0: 						 id, iter, n, out, md_type);
sl@0: 	if(unipass) {
sl@0: 		OPENSSL_cleanse(unipass, uniplen);	/* Clear password from memory */
sl@0: 		OPENSSL_free(unipass);
sl@0: 	}
sl@0: 	return ret;
sl@0: }
sl@0: 
sl@0: EXPORT_C int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
sl@0: 	     int saltlen, int id, int iter, int n, unsigned char *out,
sl@0: 	     const EVP_MD *md_type)
sl@0: {
sl@0: 	unsigned char *B, *D, *I, *p, *Ai;
sl@0: 	int Slen, Plen, Ilen, Ijlen;
sl@0: 	int i, j, u, v;
sl@0: 	BIGNUM *Ij, *Bpl1;	/* These hold Ij and B + 1 */
sl@0: 	EVP_MD_CTX ctx;
sl@0: #ifdef  DEBUG_KEYGEN
sl@0: 	unsigned char *tmpout = out;
sl@0: 	int tmpn = n;
sl@0: #endif
sl@0: 
sl@0: #if 0
sl@0: 	if (!pass) {
sl@0: 		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_PASSED_NULL_PARAMETER);
sl@0: 		return 0;
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: 	EVP_MD_CTX_init(&ctx);
sl@0: #ifdef  DEBUG_KEYGEN
sl@0: 	fprintf(stderr, "KEYGEN DEBUG\n");
sl@0: 	fprintf(stderr, "ID %d, ITER %d\n", id, iter);
sl@0: 	fprintf(stderr, "Password (length %d):\n", passlen);
sl@0: 	h__dump(pass, passlen);
sl@0: 	fprintf(stderr, "Salt (length %d):\n", saltlen);
sl@0: 	h__dump(salt, saltlen);
sl@0: #endif
sl@0: 	v = EVP_MD_block_size (md_type);
sl@0: 	u = EVP_MD_size (md_type);
sl@0: 	D = OPENSSL_malloc (v);
sl@0: 	Ai = OPENSSL_malloc (u);
sl@0: 	B = OPENSSL_malloc (v + 1);
sl@0: 	Slen = v * ((saltlen+v-1)/v);
sl@0: 	if(passlen) Plen = v * ((passlen+v-1)/v);
sl@0: 	else Plen = 0;
sl@0: 	Ilen = Slen + Plen;
sl@0: 	I = OPENSSL_malloc (Ilen);
sl@0: 	Ij = BN_new();
sl@0: 	Bpl1 = BN_new();
sl@0: 	if (!D || !Ai || !B || !I || !Ij || !Bpl1) {
sl@0: 		PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI,ERR_R_MALLOC_FAILURE);
sl@0: 		return 0;
sl@0: 	}
sl@0: 	for (i = 0; i < v; i++) D[i] = id;
sl@0: 	p = I;
sl@0: 	for (i = 0; i < Slen; i++) *p++ = salt[i % saltlen];
sl@0: 	for (i = 0; i < Plen; i++) *p++ = pass[i % passlen];
sl@0: 	for (;;) {
sl@0: 		EVP_DigestInit_ex(&ctx, md_type, NULL);
sl@0: 		EVP_DigestUpdate(&ctx, D, v);
sl@0: 		EVP_DigestUpdate(&ctx, I, Ilen);
sl@0: 		EVP_DigestFinal_ex(&ctx, Ai, NULL);
sl@0: 		for (j = 1; j < iter; j++) {
sl@0: 			EVP_DigestInit_ex(&ctx, md_type, NULL);
sl@0: 			EVP_DigestUpdate(&ctx, Ai, u);
sl@0: 			EVP_DigestFinal_ex(&ctx, Ai, NULL);
sl@0: 		}
sl@0: 		memcpy (out, Ai, min (n, u));
sl@0: 		if (u >= n) {
sl@0: 			OPENSSL_free (Ai);
sl@0: 			OPENSSL_free (B);
sl@0: 			OPENSSL_free (D);
sl@0: 			OPENSSL_free (I);
sl@0: 			BN_free (Ij);
sl@0: 			BN_free (Bpl1);
sl@0: 			EVP_MD_CTX_cleanup(&ctx);
sl@0: #ifdef DEBUG_KEYGEN
sl@0: 			fprintf(stderr, "Output KEY (length %d)\n", tmpn);
sl@0: 			h__dump(tmpout, tmpn);
sl@0: #endif
sl@0: 			return 1;	
sl@0: 		}
sl@0: 		n -= u;
sl@0: 		out += u;
sl@0: 		for (j = 0; j < v; j++) B[j] = Ai[j % u];
sl@0: 		/* Work out B + 1 first then can use B as tmp space */
sl@0: 		BN_bin2bn (B, v, Bpl1);
sl@0: 		BN_add_word (Bpl1, 1);
sl@0: 		for (j = 0; j < Ilen ; j+=v) {
sl@0: 			BN_bin2bn (I + j, v, Ij);
sl@0: 			BN_add (Ij, Ij, Bpl1);
sl@0: 			BN_bn2bin (Ij, B);
sl@0: 			Ijlen = BN_num_bytes (Ij);
sl@0: 			/* If more than 2^(v*8) - 1 cut off MSB */
sl@0: 			if (Ijlen > v) {
sl@0: 				BN_bn2bin (Ij, B);
sl@0: 				memcpy (I + j, B + 1, v);
sl@0: #ifndef PKCS12_BROKEN_KEYGEN
sl@0: 			/* If less than v bytes pad with zeroes */
sl@0: 			} else if (Ijlen < v) {
sl@0: 				memset(I + j, 0, v - Ijlen);
sl@0: 				BN_bn2bin(Ij, I + j + v - Ijlen); 
sl@0: #endif
sl@0: 			} else BN_bn2bin (Ij, I + j);
sl@0: 		}
sl@0: 	}
sl@0: }
sl@0: #ifdef DEBUG_KEYGEN
sl@0: void h__dump (unsigned char *p, int len)
sl@0: {
sl@0: 	for (; len --; p++) fprintf(stderr, "%02X", *p);
sl@0: 	fprintf(stderr, "\n");	
sl@0: }
sl@0: #endif