/* 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 #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 /* * 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 = 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_cleanup(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_cleanup(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