diff options
Diffstat (limited to 'openssl/crypto/evp/p5_crpt2.c')
| -rw-r--r-- | openssl/crypto/evp/p5_crpt2.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/openssl/crypto/evp/p5_crpt2.c b/openssl/crypto/evp/p5_crpt2.c new file mode 100644 index 00000000..334379f3 --- /dev/null +++ b/openssl/crypto/evp/p5_crpt2.c @@ -0,0 +1,299 @@ +/* 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> + +/* 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; + + mdlen = EVP_MD_size(digest); + if (mdlen < 0) + return 0; + + HMAC_CTX_init(&hctx); + p = out; + tkeylen = keylen; + if(!pass) + passlen = 0; + else if(passlen == -1) + passlen = strlen(pass); + 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); + HMAC_Init_ex(&hctx, pass, passlen, digest, 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(digest, pass, passlen, + digtmp, mdlen, 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; + } + +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) +{ + unsigned char *salt, key[EVP_MAX_KEY_LENGTH]; + const unsigned char *pbuf; + int saltlen, iter, plen; + unsigned int keylen; + PBE2PARAM *pbe2 = NULL; + const EVP_CIPHER *cipher; + PBKDF2PARAM *kdf = NULL; + const EVP_MD *prfmd; + int prf_nid, hmac_md_nid; + + if (param == NULL || param->type != V_ASN1_SEQUENCE || + param->value.sequence == NULL) { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR); + return 0; + } + + 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); + 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_cipherbyobj(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 */ + + if(!pbe2->keyfunc->parameter || + (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE)) + { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR); + goto err; + } + + pbuf = pbe2->keyfunc->parameter->value.sequence->data; + plen = pbe2->keyfunc->parameter->value.sequence->length; + if(!(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) != (int)keylen)){ + EVPerr(EVP_F_PKCS5_V2_PBE_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_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF); + goto err; + } + + prfmd = EVP_get_digestbynid(hmac_md_nid); + if (prfmd == NULL) + { + 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); + if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd, + keylen, key)) + goto err; + 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_PKCS5V2 +static void h__dump (const unsigned char *p, int len) +{ + for (; len --; p++) fprintf(stderr, "%02X ", *p); + fprintf(stderr, "\n"); +} +#endif +#endif |