/* p5_crpt2.c *//* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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). * */#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)#include <stdio.h>#include <stdlib.h>#include "cryptlib.h"#include <openssl/x509.h>#include <openssl/evp.h>#include <openssl/hmac.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 using the only currently defined function HMAC * with SHA1. 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_SHA1(const char *pass, int passlen,			   unsigned char *salt, int saltlen, int iter,			   int keylen, unsigned char *out){	unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4];	int cplen, j, k, tkeylen;	unsigned long i = 1;	HMAC_CTX hctx;	HMAC_CTX_init(&hctx);	p = out;	tkeylen = keylen;	if(!pass) passlen = 0;	else if(passlen == -1) passlen = strlen(pass);	while(tkeylen) {		if(tkeylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;		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);		HMAC_Init_ex(&hctx, pass, passlen, EVP_sha1(), NULL);		HMAC_Update(&hctx, salt, saltlen);		HMAC_Update(&hctx, itmp, 4);		HMAC_Final(&hctx, digtmp, NULL);		memcpy(p, digtmp, cplen);		for(j = 1; j < iter; j++) {			HMAC(EVP_sha1(), pass, passlen,				 digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);			for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];		}		tkeylen-= cplen;		i++;		p+= cplen;	}	HMAC_CTX_cleanup(&hctx);#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;}#ifdef DO_TESTmain(){	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){	unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH];	int saltlen, keylen, iter, plen;	PBE2PARAM *pbe2 = NULL;	const EVP_CIPHER *cipher;	PBKDF2PARAM *kdf = NULL;	pbuf = param->value.sequence->data;	plen = param->value.sequence->length;	if(!param || (param->type != V_ASN1_SEQUENCE) ||				   !(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);		return 0;	}	/* 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_cipherbyname(			OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));	if(!cipher) {		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,						EVP_R_UNSUPPORTED_CIPHER);		goto err;	}	/* Fixup cipher based on AlgorithmIdentifier */	EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);	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;	}	keylen = EVP_CIPHER_CTX_key_length(ctx);	OPENSSL_assert(keylen <= sizeof key);	/* Now decode key derivation function */	pbuf = pbe2->keyfunc->parameter->value.sequence->data;	plen = pbe2->keyfunc->parameter->value.sequence->length;	if(!pbe2->keyfunc->parameter ||		 (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) ||				!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);		goto err;	}	PBE2PARAM_free(pbe2);	pbe2 = NULL;	/* Now check the parameters of the kdf */	if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,						EVP_R_UNSUPPORTED_KEYLENGTH);		goto err;	}	if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {		EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);		goto err;	}	if(kdf->salt->type != V_ASN1_OCTET_STRING) {		EVPerr(EVP_F_PKCS5_V2_PBE_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);	PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);	EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);	OPENSSL_cleanse(key, keylen);	PBKDF2PARAM_free(kdf);	return 1;	err:	PBE2PARAM_free(pbe2);	PBKDF2PARAM_free(kdf);	return 0;}#ifdef DEBUG_PKCS5V2static void h__dump (const unsigned char *p, int len){        for (; len --; p++) fprintf(stderr, "%02X ", *p);        fprintf(stderr, "\n");}#endif#endif