X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fp5_crpt2.c;h=dcc04631bd8399d7cd55a2b9a5039ccb4da178df;hp=098ce8afa00953001a063f0270b3a383a44f608d;hb=fa0c23de83efaf92da17cffce12444adbca48c89;hpb=54a656ef081f72a740c550ebd8099b40b8b5cde0 diff --git a/crypto/evp/p5_crpt2.c b/crypto/evp/p5_crpt2.c index 098ce8afa0..dcc04631bd 100644 --- a/crypto/evp/p5_crpt2.c +++ b/crypto/evp/p5_crpt2.c @@ -1,16 +1,17 @@ /* p5_crpt2.c */ -/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL - * project 1999. +/* + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project + * 1999. */ /* ==================================================================== - * Copyright (c) 1999 The OpenSSL Project. All rights reserved. + * 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. + * 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 @@ -55,197 +56,261 @@ * Hudson (tjh@cryptsoft.com). * */ -#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA) #include #include -#include "cryptlib.h" -#include -#include -#include +#include "internal/cryptlib.h" +# include +# include +# include +# 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 +# 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 - * to the PKCS-TNG mailing list. +/* + * 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 to the PKCS-TNG + * 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 = HMAC_CTX_EMPTY, hctx = HMAC_CTX_EMPTY; + + 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, - unsigned char *salt, int saltlen, int iter, - int keylen, unsigned char *out) + const 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; + return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(), + keylen, out); } -#ifdef DO_TEST +# 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]); + 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 +# 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... +/* + * 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) + 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); - memset(key, 0, keylen); - PBKDF2PARAM_free(kdf); - return 1; - - err: - PBE2PARAM_free(pbe2); - PBKDF2PARAM_free(kdf); - return 0; + 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) +# ifdef DEBUG_PKCS5V2 +static void h__dump(const unsigned char *p, int len) { - for (; len --; p++) fprintf(stderr, "%02X ", *p); - fprintf(stderr, "\n"); + for (; len--; p++) + fprintf(stderr, "%02X ", *p); + fprintf(stderr, "\n"); } -#endif -#endif +# endif