/* p5_crpt2.c */
-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+/* 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
* Hudson (tjh@cryptsoft.com).
*
*/
-#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
#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 "cryptlib.h"
+#include "evp_locl.h"
/* set this to print out info about the keygen algorithm */
/* #define DEBUG_PKCS5V2 */
#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
+ * 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_SHA1(const char *pass, int passlen,
- unsigned char *salt, int saltlen, int iter,
+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[SHA_DIGEST_LENGTH], *p, itmp[4];
- int cplen, j, k, tkeylen;
+ {
+ unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
+ int cplen, j, k, tkeylen, mdlen;
unsigned long i = 1;
- HMAC_CTX hctx;
+ HMAC_CTX hctx_tpl, hctx;
+
+ mdlen = EVP_MD_size(digest);
+ if (mdlen < 0)
+ return 0;
- HMAC_CTX_init(&hctx);
+ HMAC_CTX_init(&hctx_tpl);
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;
+ 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[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);
+ 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++) {
- HMAC(EVP_sha1(), pass, passlen,
- digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
- for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
- }
+ 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);
+ }
+ HMAC_CTX_cleanup(&hctx_tpl);
#ifdef DEBUG_PKCS5V2
fprintf(stderr, "Password:\n");
h__dump (pass, passlen);
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()
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;
+ const unsigned char *pbuf;
+ int plen;
PBE2PARAM *pbe2 = NULL;
const EVP_CIPHER *cipher;
- PBKDF2PARAM *kdf = NULL;
+
+ 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(!param || (param->type != V_ASN1_SEQUENCE) ||
- !(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
+ if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
- return 0;
+ goto err;
}
/* See if we recognise the key derivation function */
/* lets see if we recognise the encryption algorithm.
*/
- cipher = EVP_get_cipherbyname(
- OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
+ cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
if(!cipher) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
}
/* Fixup cipher based on AlgorithmIdentifier */
- EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);
+ 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);
- /* Now decode key derivation function */
+ /* Decode parameter */
- 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);
+ 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;
}
- PBE2PARAM_free(pbe2);
- pbe2 = NULL;
+ keylen = EVP_CIPHER_CTX_key_length(ctx);
/* Now check the parameters of the kdf */
- if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
+ 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 && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
+ 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_PBE_KEYIVGEN,
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
EVP_R_UNSUPPORTED_SALT_TYPE);
goto err;
}
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;
-
+ 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:
- PBE2PARAM_free(pbe2);
+ OPENSSL_cleanse(key, keylen);
PBKDF2PARAM_free(kdf);
- return 0;
+ return rv;
}
#ifdef DEBUG_PKCS5V2
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