[thirdparty/openssl.git] / crypto / evp / p5_crpt2.c

/* p5_crpt2.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999-2006 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 <stdlib.h>
#include "cryptlib.h"
#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include "evp_locl.h"

/* set this to print out info about the keygen algorithm */
/* #define DEBUG_PKCS5V2 */

#ifdef DEBUG_PKCS5V2
	static void h__dump (const unsigned char *p, int len);
#endif

/* This is an implementation of PKCS#5 v2.0 password based encryption key
 * derivation function PBKDF2.
 * SHA1 version verified against test vectors posted by Peter Gutmann
 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
 */

int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
			   const unsigned char *salt, int saltlen, int iter,
			   const EVP_MD *digest,
			   int keylen, unsigned char *out)
	{
	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
	int cplen, j, k, tkeylen, mdlen;
	unsigned long i = 1;
	HMAC_CTX hctx_tpl, hctx;

	mdlen = EVP_MD_size(digest);
	if (mdlen < 0)
		return 0;

	HMAC_CTX_init(&hctx_tpl);
	p = out;
	tkeylen = keylen;
	if(!pass)
		passlen = 0;
	else if(passlen == -1)
		passlen = strlen(pass);
	if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL))
		{
		HMAC_CTX_cleanup(&hctx_tpl);
		return 0;
		}
	while(tkeylen)
		{
		if(tkeylen > mdlen)
			cplen = mdlen;
		else
			cplen = tkeylen;
		/* We are unlikely to ever use more than 256 blocks (5120 bits!)
		 * but just in case...
		 */
		itmp[0] = (unsigned char)((i >> 24) & 0xff);
		itmp[1] = (unsigned char)((i >> 16) & 0xff);
		itmp[2] = (unsigned char)((i >> 8) & 0xff);
		itmp[3] = (unsigned char)(i & 0xff);
		if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
			{
			HMAC_CTX_cleanup(&hctx_tpl);
			return 0;
			}
		if (!HMAC_Update(&hctx, salt, saltlen)
		    || !HMAC_Update(&hctx, itmp, 4)
		    || !HMAC_Final(&hctx, digtmp, NULL))
			{
			HMAC_CTX_cleanup(&hctx_tpl);
			HMAC_CTX_cleanup(&hctx);
			return 0;
			}
		HMAC_CTX_cleanup(&hctx);
		memcpy(p, digtmp, cplen);
		for(j = 1; j < iter; j++)
			{
			if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
				{
				HMAC_CTX_cleanup(&hctx_tpl);
				return 0;
				}
			if (!HMAC_Update(&hctx, digtmp, mdlen)
			    || !HMAC_Final(&hctx, digtmp, NULL))
				{
				HMAC_CTX_cleanup(&hctx_tpl);
				HMAC_CTX_cleanup(&hctx);
				return 0;
				}
			HMAC_CTX_cleanup(&hctx);
			for(k = 0; k < cplen; k++)
				p[k] ^= digtmp[k];
			}
		tkeylen-= cplen;
		i++;
		p+= cplen;
		}
	HMAC_CTX_cleanup(&hctx_tpl);
#ifdef DEBUG_PKCS5V2
	fprintf(stderr, "Password:\n");
	h__dump (pass, passlen);
	fprintf(stderr, "Salt:\n");
	h__dump (salt, saltlen);
	fprintf(stderr, "Iteration count %d\n", iter);
	fprintf(stderr, "Key:\n");
	h__dump (out, keylen);
#endif
	return 1;
	}

int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
			   const unsigned char *salt, int saltlen, int iter,
			   int keylen, unsigned char *out)
	{
	return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
					keylen, out);
	}

#ifdef DO_TEST
main()
{
	unsigned char out[4];
	unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
	PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
	fprintf(stderr, "Out %02X %02X %02X %02X\n",
					 out[0], out[1], out[2], out[3]);
}

#endif

/* Now the key derivation function itself. This is a bit evil because
 * it has to check the ASN1 parameters are valid: and there are quite a
 * few of them...
 */

int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                         ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
                         int en_de)
{
	const unsigned char *pbuf;
	int plen;
	PBE2PARAM *pbe2 = NULL;
	const EVP_CIPHER *cipher;

	int rv = 0;

	if (param == NULL || param->type != V_ASN1_SEQUENCE ||
	    param->value.sequence == NULL) {
		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
		goto err;
	}

	pbuf = param->value.sequence->data;
	plen = param->value.sequence->length;
	if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
		goto err;
	}

	/* See if we recognise the key derivation function */

	if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
				EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
		goto err;
	}

	/* lets see if we recognise the encryption algorithm.
	 */

	cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);

	if(!cipher) {
		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
						EVP_R_UNSUPPORTED_CIPHER);
		goto err;
	}

	/* Fixup cipher based on AlgorithmIdentifier */
	if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
		goto err;
	if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
					EVP_R_CIPHER_PARAMETER_ERROR);
		goto err;
	}
	rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
					pbe2->keyfunc->parameter, c, md, en_de);
	err:
	PBE2PARAM_free(pbe2);
	return rv;
}

int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                         ASN1_TYPE *param,
			 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
{
	unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
	const unsigned char *pbuf;
	int saltlen, iter, plen;
	int rv = 0;
	unsigned int keylen = 0;
	int prf_nid, hmac_md_nid;
	PBKDF2PARAM *kdf = NULL;
	const EVP_MD *prfmd;

	if (EVP_CIPHER_CTX_cipher(ctx) == NULL)
		{
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_NO_CIPHER_SET);
		goto err;
		}
	keylen = EVP_CIPHER_CTX_key_length(ctx);
	OPENSSL_assert(keylen <= sizeof key);

	/* Decode parameter */

	if(!param || (param->type != V_ASN1_SEQUENCE))
		{
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
		goto err;
		}

	pbuf = param->value.sequence->data;
	plen = param->value.sequence->length;

	if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
		goto err;
	}

	keylen = EVP_CIPHER_CTX_key_length(ctx);

	/* Now check the parameters of the kdf */

	if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
						EVP_R_UNSUPPORTED_KEYLENGTH);
		goto err;
	}

	if (kdf->prf)
		prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
	else
		prf_nid = NID_hmacWithSHA1;

	if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
		{
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
		goto err;
		}

	prfmd = EVP_get_digestbynid(hmac_md_nid);
	if (prfmd == NULL)
		{
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
		goto err;
		}

	if(kdf->salt->type != V_ASN1_OCTET_STRING) {
		EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
						EVP_R_UNSUPPORTED_SALT_TYPE);
		goto err;
	}

	/* it seems that its all OK */
	salt = kdf->salt->value.octet_string->data;
	saltlen = kdf->salt->value.octet_string->length;
	iter = ASN1_INTEGER_get(kdf->iter);
	if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
						   keylen, key))
		goto err;
	rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
	err:
	OPENSSL_cleanse(key, keylen);
	PBKDF2PARAM_free(kdf);
	return rv;
}

#ifdef DEBUG_PKCS5V2
static void h__dump (const unsigned char *p, int len)
{
        for (; len --; p++) fprintf(stderr, "%02X ", *p);
        fprintf(stderr, "\n");
}
#endif
#endif
Commit	Line	Data
97e4a932	1	/* p5_crpt2.c */
2e597528	2	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
97e4a932 DSH	3	* project 1999.
	4	*/
	5	/* ====================================================================
856640b5	6	* Copyright (c) 1999-2006 The OpenSSL Project. All rights reserved.
97e4a932 DSH	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	*
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in
	17	* the documentation and/or other materials provided with the
	18	* distribution.
	19	*
	20	* 3. All advertising materials mentioning features or use of this
	21	* software must display the following acknowledgment:
	22	* "This product includes software developed by the OpenSSL Project
	23	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	24	*
	25	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	26	* endorse or promote products derived from this software without
	27	* prior written permission. For written permission, please contact
	28	* licensing@OpenSSL.org.
	29	*
	30	* 5. Products derived from this software may not be called "OpenSSL"
	31	* nor may "OpenSSL" appear in their names without prior written
	32	* permission of the OpenSSL Project.
	33	*
	34	* 6. Redistributions of any form whatsoever must retain the following
	35	* acknowledgment:
	36	* "This product includes software developed by the OpenSSL Project
	37	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	38	*
	39	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	40	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	42	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	43	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	44	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	45	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	46	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	48	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	49	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	50	* OF THE POSSIBILITY OF SUCH DAMAGE.
	51	* ====================================================================
	52	*
	53	* This product includes cryptographic software written by Eric Young
	54	* (eay@cryptsoft.com). This product includes software written by Tim
	55	* Hudson (tjh@cryptsoft.com).
	56	*
	57	*/
	58	#include <stdio.h>
	59	#include <stdlib.h>
7b63c0fa	60	#include "cryptlib.h"
9c354528	61	#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
97e4a932 DSH	62	#include <openssl/x509.h>
	63	#include <openssl/evp.h>
	64	#include <openssl/hmac.h>
3d63b396	65	#include "evp_locl.h"
97e4a932	66
f513939e DSH	67	/* set this to print out info about the keygen algorithm */
	68	/* #define DEBUG_PKCS5V2 */
	69
	70	#ifdef DEBUG_PKCS5V2
	71	static void h__dump (const unsigned char *p, int len);
	72	#endif
	73
97e4a932	74	/* This is an implementation of PKCS#5 v2.0 password based encryption key
856640b5 DSH	75	* derivation function PBKDF2.
856640b5 DSH	76	* SHA1 version verified against test vectors posted by Peter Gutmann
97e4a932 DSH	77	* <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
	78	*/
	79
856640b5	80	int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
875a644a	81	const unsigned char *salt, int saltlen, int iter,
856640b5	82	const EVP_MD *digest,
72fbe87d	83	int keylen, unsigned char *out)
856640b5 DSH	84	{
	85	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
	86	int cplen, j, k, tkeylen, mdlen;
97e4a932	87	unsigned long i = 1;
c10e3f0c	88	HMAC_CTX hctx_tpl, hctx;
dbad1690	89
856640b5	90	mdlen = EVP_MD_size(digest);
0eab41fb BL	91	if (mdlen < 0)
0eab41fb BL	92	return 0;
856640b5	93
b0513fd2	94	HMAC_CTX_init(&hctx_tpl);
97e4a932	95	p = out;
f513939e	96	tkeylen = keylen;
856640b5 DSH	97	if(!pass)
	98	passlen = 0;
	99	else if(passlen == -1)
	100	passlen = strlen(pass);
c10e3f0c BL	101	if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL))
	102	{
	103	HMAC_CTX_cleanup(&hctx_tpl);
	104	return 0;
	105	}
856640b5 DSH	106	while(tkeylen)
	107	{
	108	if(tkeylen > mdlen)
	109	cplen = mdlen;
	110	else
	111	cplen = tkeylen;
97e4a932 DSH	112	/* We are unlikely to ever use more than 256 blocks (5120 bits!)
	113	* but just in case...
	114	*/
f598cd13 DSH	115	itmp[0] = (unsigned char)((i >> 24) & 0xff);
	116	itmp[1] = (unsigned char)((i >> 16) & 0xff);
	117	itmp[2] = (unsigned char)((i >> 8) & 0xff);
	118	itmp[3] = (unsigned char)(i & 0xff);
c10e3f0c	119	if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
b6dcdbfc	120	{
c10e3f0c BL	121	HMAC_CTX_cleanup(&hctx_tpl);
	122	return 0;
	123	}
	124	if (!HMAC_Update(&hctx, salt, saltlen)
	125	\|\| !HMAC_Update(&hctx, itmp, 4)
	126	\|\| !HMAC_Final(&hctx, digtmp, NULL))
	127	{
	128	HMAC_CTX_cleanup(&hctx_tpl);
b6dcdbfc DSH	129	HMAC_CTX_cleanup(&hctx);
	130	return 0;
	131	}
16bc45ba	132	HMAC_CTX_cleanup(&hctx);
97e4a932	133	memcpy(p, digtmp, cplen);
856640b5 DSH	134	for(j = 1; j < iter; j++)
856640b5 DSH	135	{
c10e3f0c BL	136	if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
	137	{
	138	HMAC_CTX_cleanup(&hctx_tpl);
	139	return 0;
	140	}
	141	if (!HMAC_Update(&hctx, digtmp, mdlen)
	142	\|\| !HMAC_Final(&hctx, digtmp, NULL))
	143	{
	144	HMAC_CTX_cleanup(&hctx_tpl);
	145	HMAC_CTX_cleanup(&hctx);
	146	return 0;
	147	}
	148	HMAC_CTX_cleanup(&hctx);
856640b5 DSH	149	for(k = 0; k < cplen; k++)
	150	p[k] ^= digtmp[k];
	151	}
f513939e	152	tkeylen-= cplen;
97e4a932 DSH	153	i++;
97e4a932 DSH	154	p+= cplen;
856640b5	155	}
c10e3f0c	156	HMAC_CTX_cleanup(&hctx_tpl);
f513939e DSH	157	#ifdef DEBUG_PKCS5V2
	158	fprintf(stderr, "Password:\n");
	159	h__dump (pass, passlen);
	160	fprintf(stderr, "Salt:\n");
	161	h__dump (salt, saltlen);
	162	fprintf(stderr, "Iteration count %d\n", iter);
	163	fprintf(stderr, "Key:\n");
	164	h__dump (out, keylen);
	165	#endif
97e4a932	166	return 1;
856640b5 DSH	167	}
	168
	169	int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
	170	const unsigned char *salt, int saltlen, int iter,
	171	int keylen, unsigned char *out)
	172	{
	173	return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
	174	keylen, out);
	175	}
97e4a932 DSH	176
	177	#ifdef DO_TEST
	178	main()
	179	{
	180	unsigned char out[4];
	181	unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
	182	PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
	183	fprintf(stderr, "Out %02X %02X %02X %02X\n",
	184	out[0], out[1], out[2], out[3]);
	185	}
	186
	187	#endif
	188
	189	/* Now the key derivation function itself. This is a bit evil because
	190	* it has to check the ASN1 parameters are valid: and there are quite a
	191	* few of them...
	192	*/
	193
	194	int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX ctx, const char pass, int passlen,
13588350	195	ASN1_TYPE param, const EVP_CIPHER c, const EVP_MD *md,
97e4a932 DSH	196	int en_de)
97e4a932 DSH	197	{
875a644a	198	const unsigned char *pbuf;
3d63b396	199	int plen;
97e4a932 DSH	200	PBE2PARAM *pbe2 = NULL;
97e4a932 DSH	201	const EVP_CIPHER *cipher;
3d63b396 DSH	202
3d63b396 DSH	203	int rv = 0;
97e4a932	204
c755c5fd NL	205	if (param == NULL \|\| param->type != V_ASN1_SEQUENCE \|\|
	206	param->value.sequence == NULL) {
	207	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
3d63b396	208	goto err;
c755c5fd NL	209	}
c755c5fd NL	210
97e4a932 DSH	211	pbuf = param->value.sequence->data;
97e4a932 DSH	212	plen = param->value.sequence->length;
c755c5fd	213	if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
97e4a932	214	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
3d63b396	215	goto err;
97e4a932 DSH	216	}
	217
	218	/* See if we recognise the key derivation function */
	219
	220	if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
	221	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
	222	EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
	223	goto err;
	224	}
	225
	226	/* lets see if we recognise the encryption algorithm.
	227	*/
	228
a620626a	229	cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
97e4a932 DSH	230
	231	if(!cipher) {
	232	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
	233	EVP_R_UNSUPPORTED_CIPHER);
	234	goto err;
	235	}
	236
	237	/* Fixup cipher based on AlgorithmIdentifier */
b6dcdbfc	238	if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
b6dcdbfc	239	goto err;
97e4a932 DSH	240	if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
	241	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
	242	EVP_R_CIPHER_PARAMETER_ERROR);
	243	goto err;
	244	}
3d63b396 DSH	245	rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
	246	pbe2->keyfunc->parameter, c, md, en_de);
	247	err:
	248	PBE2PARAM_free(pbe2);
	249	return rv;
	250	}
	251
	252	int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX ctx, const char pass, int passlen,
	253	ASN1_TYPE *param,
	254	const EVP_CIPHER c, const EVP_MD md, int en_de)
	255	{
	256	unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
	257	const unsigned char *pbuf;
	258	int saltlen, iter, plen;
	259	int rv = 0;
19ec2f41	260	unsigned int keylen = 0;
3d63b396 DSH	261	int prf_nid, hmac_md_nid;
	262	PBKDF2PARAM *kdf = NULL;
	263	const EVP_MD *prfmd;
	264
	265	if (EVP_CIPHER_CTX_cipher(ctx) == NULL)
	266	{
	267	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_NO_CIPHER_SET);
	268	goto err;
	269	}
97e4a932	270	keylen = EVP_CIPHER_CTX_key_length(ctx);
54a656ef	271	OPENSSL_assert(keylen <= sizeof key);
97e4a932	272
3d63b396	273	/* Decode parameter */
97e4a932	274
3d63b396	275	if(!param \|\| (param->type != V_ASN1_SEQUENCE))
9dc17a25	276	{
3d63b396	277	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
9dc17a25 DSH	278	goto err;
	279	}
	280
3d63b396 DSH	281	pbuf = param->value.sequence->data;
	282	plen = param->value.sequence->length;
	283
9dc17a25	284	if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
3d63b396	285	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
97e4a932 DSH	286	goto err;
	287	}
	288
3d63b396	289	keylen = EVP_CIPHER_CTX_key_length(ctx);
97e4a932 DSH	290
	291	/* Now check the parameters of the kdf */
	292
27545970	293	if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
3d63b396	294	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
97e4a932 DSH	295	EVP_R_UNSUPPORTED_KEYLENGTH);
	296	goto err;
	297	}
	298
856640b5 DSH	299	if (kdf->prf)
	300	prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
	301	else
	302	prf_nid = NID_hmacWithSHA1;
	303
	304	if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
	305	{
3d63b396	306	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
97e4a932	307	goto err;
856640b5 DSH	308	}
	309
	310	prfmd = EVP_get_digestbynid(hmac_md_nid);
	311	if (prfmd == NULL)
	312	{
3d63b396	313	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
856640b5 DSH	314	goto err;
856640b5 DSH	315	}
97e4a932 DSH	316
97e4a932 DSH	317	if(kdf->salt->type != V_ASN1_OCTET_STRING) {
3d63b396	318	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
97e4a932 DSH	319	EVP_R_UNSUPPORTED_SALT_TYPE);
	320	goto err;
	321	}
	322
	323	/* it seems that its all OK */
	324	salt = kdf->salt->value.octet_string->data;
	325	saltlen = kdf->salt->value.octet_string->length;
	326	iter = ASN1_INTEGER_get(kdf->iter);
0eab41fb BL	327	if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
	328	keylen, key))
	329	goto err;
3d63b396	330	rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
97e4a932	331	err:
3d63b396	332	OPENSSL_cleanse(key, keylen);
97e4a932	333	PBKDF2PARAM_free(kdf);
3d63b396	334	return rv;
97e4a932	335	}
f513939e DSH	336
	337	#ifdef DEBUG_PKCS5V2
	338	static void h__dump (const unsigned char *p, int len)
	339	{
	340	for (; len --; p++) fprintf(stderr, "%02X ", *p);
	341	fprintf(stderr, "\n");
	342	}
5676d8cb	343	#endif
9a3bbbce	344	#endif