[thirdparty/openssl.git] / crypto / evp / 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 "internal/cryptlib.h"
# 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 = NULL, *hctx = NULL;

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

    hctx_tpl = HMAC_CTX_new();
    if (hctx_tpl == NULL)
        return 0;
    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_free(hctx_tpl);
        return 0;
    }
    hctx = HMAC_CTX_new();
    if (hctx == NULL) {
        HMAC_CTX_free(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_free(hctx);
            HMAC_CTX_free(hctx_tpl);
            return 0;
        }
        if (!HMAC_Update(hctx, salt, saltlen)
            || !HMAC_Update(hctx, itmp, 4)
            || !HMAC_Final(hctx, digtmp, NULL)) {
            HMAC_CTX_free(hctx);
            HMAC_CTX_free(hctx_tpl);
            return 0;
        }
        HMAC_CTX_reset(hctx);
        memcpy(p, digtmp, cplen);
        for (j = 1; j < iter; j++) {
            if (!HMAC_CTX_copy(hctx, hctx_tpl)) {
                HMAC_CTX_free(hctx);
                HMAC_CTX_free(hctx_tpl);
                return 0;
            }
            if (!HMAC_Update(hctx, digtmp, mdlen)
                || !HMAC_Final(hctx, digtmp, NULL)) {
                HMAC_CTX_free(hctx);
                HMAC_CTX_free(hctx_tpl);
                return 0;
            }
            HMAC_CTX_reset(hctx);
            for (k = 0; k < cplen; k++)
                p[k] ^= digtmp[k];
        }
        tkeylen -= cplen;
        i++;
        p += cplen;
    }
    HMAC_CTX_free(hctx);
    HMAC_CTX_free(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)
{
    PBE2PARAM *pbe2 = NULL;
    const EVP_CIPHER *cipher;
    EVP_PBE_KEYGEN *kdf;

    int rv = 0;

    pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
    if (pbe2 == NULL) {
        EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
        goto err;
    }

    /* See if we recognise the key derivation function */
    if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
			NULL, NULL, &kdf)) {
        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 = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, 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];
    int saltlen, iter;
    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 */

    kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);

    if (kdf == NULL) {
        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
Commit	Line	Data
0f113f3e MC	1	/*
	2	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	3	* 1999.
97e4a932 DSH	4	*/
97e4a932 DSH	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
0f113f3e	13	* notice, this list of conditions and the following disclaimer.
97e4a932 DSH	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>
b39fc560	60	#include "internal/cryptlib.h"
0f113f3e MC	61	# include <openssl/x509.h>
	62	# include <openssl/evp.h>
	63	# include <openssl/hmac.h>
	64	# include "evp_locl.h"
97e4a932	65
f513939e DSH	66	/* set this to print out info about the keygen algorithm */
	67	/* #define DEBUG_PKCS5V2 */
	68
0f113f3e MC	69	# ifdef DEBUG_PKCS5V2
	70	static void h__dump(const unsigned char *p, int len);
	71	# endif
f513939e	72
0f113f3e MC	73	/*
	74	* This is an implementation of PKCS#5 v2.0 password based encryption key
	75	* derivation function PBKDF2. SHA1 version verified against test vectors
	76	* posted by Peter Gutmann <pgut001@cs.auckland.ac.nz> to the PKCS-TNG
	77	* <pkcs-tng@rsa.com> mailing list.
97e4a932 DSH	78	*/
97e4a932 DSH	79
856640b5	80	int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
0f113f3e MC	81	const unsigned char *salt, int saltlen, int iter,
	82	const EVP_MD digest, int keylen, unsigned char out)
	83	{
	84	unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
	85	int cplen, j, k, tkeylen, mdlen;
	86	unsigned long i = 1;
bf7c6817	87	HMAC_CTX hctx_tpl = NULL, hctx = NULL;
0f113f3e MC	88
	89	mdlen = EVP_MD_size(digest);
	90	if (mdlen < 0)
	91	return 0;
	92
bf7c6817 RL	93	hctx_tpl = HMAC_CTX_new();
	94	if (hctx_tpl == NULL)
	95	return 0;
0f113f3e MC	96	p = out;
	97	tkeylen = keylen;
	98	if (!pass)
	99	passlen = 0;
	100	else if (passlen == -1)
	101	passlen = strlen(pass);
bf7c6817 RL	102	if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL)) {
	103	HMAC_CTX_free(hctx_tpl);
	104	return 0;
	105	}
	106	hctx = HMAC_CTX_new();
	107	if (hctx == NULL) {
	108	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	109	return 0;
	110	}
	111	while (tkeylen) {
	112	if (tkeylen > mdlen)
	113	cplen = mdlen;
	114	else
	115	cplen = tkeylen;
	116	/*
	117	* We are unlikely to ever use more than 256 blocks (5120 bits!) but
	118	* just in case...
	119	*/
	120	itmp[0] = (unsigned char)((i >> 24) & 0xff);
	121	itmp[1] = (unsigned char)((i >> 16) & 0xff);
	122	itmp[2] = (unsigned char)((i >> 8) & 0xff);
	123	itmp[3] = (unsigned char)(i & 0xff);
bf7c6817 RL	124	if (!HMAC_CTX_copy(hctx, hctx_tpl)) {
	125	HMAC_CTX_free(hctx);
	126	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	127	return 0;
0f113f3e MC	128	}
bf7c6817 RL	129	if (!HMAC_Update(hctx, salt, saltlen)
	130	\|\| !HMAC_Update(hctx, itmp, 4)
	131	\|\| !HMAC_Final(hctx, digtmp, NULL)) {
	132	HMAC_CTX_free(hctx);
	133	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	134	return 0;
0f113f3e MC	135	}
a87a0a6e	136	HMAC_CTX_reset(hctx);
0f113f3e MC	137	memcpy(p, digtmp, cplen);
0f113f3e MC	138	for (j = 1; j < iter; j++) {
bf7c6817 RL	139	if (!HMAC_CTX_copy(hctx, hctx_tpl)) {
	140	HMAC_CTX_free(hctx);
	141	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	142	return 0;
0f113f3e MC	143	}
bf7c6817 RL	144	if (!HMAC_Update(hctx, digtmp, mdlen)
	145	\|\| !HMAC_Final(hctx, digtmp, NULL)) {
	146	HMAC_CTX_free(hctx);
	147	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	148	return 0;
0f113f3e MC	149	}
a87a0a6e	150	HMAC_CTX_reset(hctx);
0f113f3e MC	151	for (k = 0; k < cplen; k++)
	152	p[k] ^= digtmp[k];
	153	}
	154	tkeylen -= cplen;
	155	i++;
	156	p += cplen;
	157	}
bf7c6817 RL	158	HMAC_CTX_free(hctx);
bf7c6817 RL	159	HMAC_CTX_free(hctx_tpl);
0f113f3e MC	160	# ifdef DEBUG_PKCS5V2
	161	fprintf(stderr, "Password:\n");
	162	h__dump(pass, passlen);
	163	fprintf(stderr, "Salt:\n");
	164	h__dump(salt, saltlen);
	165	fprintf(stderr, "Iteration count %d\n", iter);
	166	fprintf(stderr, "Key:\n");
	167	h__dump(out, keylen);
	168	# endif
	169	return 1;
	170	}
856640b5 DSH	171
856640b5 DSH	172	int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
0f113f3e MC	173	const unsigned char *salt, int saltlen, int iter,
	174	int keylen, unsigned char *out)
	175	{
	176	return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
	177	keylen, out);
	178	}
	179
	180	# ifdef DO_TEST
97e4a932 DSH	181	main()
97e4a932 DSH	182	{
0f113f3e MC	183	unsigned char out[4];
	184	unsigned char salt[] = { 0x12, 0x34, 0x56, 0x78 };
	185	PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
	186	fprintf(stderr, "Out %02X %02X %02X %02X\n",
	187	out[0], out[1], out[2], out[3]);
97e4a932 DSH	188	}
97e4a932 DSH	189
0f113f3e	190	# endif
97e4a932	191
0f113f3e MC	192	/*
	193	* Now the key derivation function itself. This is a bit evil because it has
	194	* to check the ASN1 parameters are valid: and there are quite a few of
	195	* them...
97e4a932 DSH	196	*/
	197
	198	int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX ctx, const char pass, int passlen,
0f113f3e MC	199	ASN1_TYPE param, const EVP_CIPHER c,
0f113f3e MC	200	const EVP_MD *md, int en_de)
97e4a932	201	{
0f113f3e MC	202	PBE2PARAM *pbe2 = NULL;
0f113f3e MC	203	const EVP_CIPHER *cipher;
d6c5462e	204	EVP_PBE_KEYGEN *kdf;
0f113f3e MC	205
	206	int rv = 0;
	207
e93c8748 DSH	208	pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
e93c8748 DSH	209	if (pbe2 == NULL) {
0f113f3e MC	210	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
	211	goto err;
	212	}
	213
	214	/* See if we recognise the key derivation function */
d6c5462e DSH	215	if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
d6c5462e DSH	216	NULL, NULL, &kdf)) {
0f113f3e MC	217	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
	218	EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
	219	goto err;
	220	}
	221
	222	/*
	223	* lets see if we recognise the encryption algorithm.
	224	*/
	225
	226	cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
	227
	228	if (!cipher) {
	229	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
	230	goto err;
	231	}
	232
	233	/* Fixup cipher based on AlgorithmIdentifier */
	234	if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
	235	goto err;
	236	if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
	237	EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
	238	goto err;
	239	}
d6c5462e	240	rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
0f113f3e MC	241	err:
	242	PBE2PARAM_free(pbe2);
	243	return rv;
3d63b396 DSH	244	}
3d63b396 DSH	245
0f113f3e MC	246	int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX ctx, const char pass,
	247	int passlen, ASN1_TYPE *param,
	248	const EVP_CIPHER c, const EVP_MD md, int en_de)
3d63b396	249	{
0f113f3e	250	unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
e93c8748	251	int saltlen, iter;
0f113f3e MC	252	int rv = 0;
	253	unsigned int keylen = 0;
	254	int prf_nid, hmac_md_nid;
	255	PBKDF2PARAM *kdf = NULL;
	256	const EVP_MD *prfmd;
	257
	258	if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
	259	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
	260	goto err;
	261	}
	262	keylen = EVP_CIPHER_CTX_key_length(ctx);
	263	OPENSSL_assert(keylen <= sizeof key);
	264
	265	/* Decode parameter */
	266
e93c8748	267	kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
0f113f3e	268
e93c8748	269	if (kdf == NULL) {
0f113f3e MC	270	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
	271	goto err;
	272	}
	273
	274	keylen = EVP_CIPHER_CTX_key_length(ctx);
	275
	276	/* Now check the parameters of the kdf */
	277
	278	if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
	279	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
	280	goto err;
	281	}
	282
	283	if (kdf->prf)
	284	prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
	285	else
	286	prf_nid = NID_hmacWithSHA1;
	287
	288	if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
	289	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
	290	goto err;
	291	}
	292
	293	prfmd = EVP_get_digestbynid(hmac_md_nid);
	294	if (prfmd == NULL) {
	295	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
	296	goto err;
	297	}
	298
	299	if (kdf->salt->type != V_ASN1_OCTET_STRING) {
	300	EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
	301	goto err;
	302	}
	303
	304	/* it seems that its all OK */
	305	salt = kdf->salt->value.octet_string->data;
	306	saltlen = kdf->salt->value.octet_string->length;
	307	iter = ASN1_INTEGER_get(kdf->iter);
	308	if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
	309	keylen, key))
	310	goto err;
	311	rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
	312	err:
	313	OPENSSL_cleanse(key, keylen);
	314	PBKDF2PARAM_free(kdf);
	315	return rv;
97e4a932	316	}
f513939e	317
0f113f3e MC	318	# ifdef DEBUG_PKCS5V2
0f113f3e MC	319	static void h__dump(const unsigned char *p, int len)
f513939e	320	{
0f113f3e MC	321	for (; len--; p++)
	322	fprintf(stderr, "%02X ", *p);
	323	fprintf(stderr, "\n");
f513939e	324	}
0f113f3e	325	# endif