/* p5_pbev2.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). * */ #include <stdio.h> #include "cryptlib.h" #include <openssl/asn1t.h> #include <openssl/x509.h> #include <openssl/rand.h> /* PKCS#5 v2.0 password based encryption structures */ ASN1_SEQUENCE(PBE2PARAM) = { ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR), ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR) } ASN1_SEQUENCE_END(PBE2PARAM) IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM) ASN1_SEQUENCE(PBKDF2PARAM) = { ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY), ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER), ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER), ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR) } ASN1_SEQUENCE_END(PBKDF2PARAM) IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM) /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: * yes I know this is horrible! */ X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, unsigned char *salt, int saltlen) { X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL; int alg_nid; EVP_CIPHER_CTX ctx; unsigned char iv[EVP_MAX_IV_LENGTH]; PBKDF2PARAM *kdf = NULL; PBE2PARAM *pbe2 = NULL; ASN1_OCTET_STRING *osalt = NULL; ASN1_OBJECT *obj; alg_nid = EVP_CIPHER_type(cipher); if(alg_nid == NID_undef) { ASN1err(ASN1_F_PKCS5_PBE2_SET, ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER); goto err; } obj = OBJ_nid2obj(alg_nid); if(!(pbe2 = PBE2PARAM_new())) goto merr; /* Setup the AlgorithmIdentifier for the encryption scheme */ scheme = pbe2->encryption; scheme->algorithm = obj; if(!(scheme->parameter = ASN1_TYPE_new())) goto merr; /* Create random IV */ if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0) goto err; EVP_CIPHER_CTX_init(&ctx); /* Dummy cipherinit to just setup the IV */ EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0); if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) { ASN1err(ASN1_F_PKCS5_PBE2_SET, ASN1_R_ERROR_SETTING_CIPHER_PARAMS); goto err; } EVP_CIPHER_CTX_cleanup(&ctx); if(!(kdf = PBKDF2PARAM_new())) goto merr; if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr; if (!saltlen) saltlen = PKCS5_SALT_LEN; if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr; osalt->length = saltlen; if (salt) memcpy (osalt->data, salt, saltlen); else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr; if(iter <= 0) iter = PKCS5_DEFAULT_ITER; if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr; /* Now include salt in kdf structure */ kdf->salt->value.octet_string = osalt; kdf->salt->type = V_ASN1_OCTET_STRING; osalt = NULL; /* If its RC2 then we'd better setup the key length */ if(alg_nid == NID_rc2_cbc) { if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr; if(!ASN1_INTEGER_set (kdf->keylength, EVP_CIPHER_key_length(cipher))) goto merr; } /* prf can stay NULL because we are using hmacWithSHA1 */ /* Now setup the PBE2PARAM keyfunc structure */ pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); /* Encode PBKDF2PARAM into parameter of pbe2 */ if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr; if(!ASN1_pack_string(kdf, i2d_PBKDF2PARAM, &pbe2->keyfunc->parameter->value.sequence)) goto merr; pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE; PBKDF2PARAM_free(kdf); kdf = NULL; /* Now set up top level AlgorithmIdentifier */ if(!(ret = X509_ALGOR_new())) goto merr; if(!(ret->parameter = ASN1_TYPE_new())) goto merr; ret->algorithm = OBJ_nid2obj(NID_pbes2); /* Encode PBE2PARAM into parameter */ if(!ASN1_pack_string(pbe2, i2d_PBE2PARAM, &ret->parameter->value.sequence)) goto merr; ret->parameter->type = V_ASN1_SEQUENCE; PBE2PARAM_free(pbe2); pbe2 = NULL; return ret; merr: ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE); err: PBE2PARAM_free(pbe2); /* Note 'scheme' is freed as part of pbe2 */ M_ASN1_OCTET_STRING_free(osalt); PBKDF2PARAM_free(kdf); X509_ALGOR_free(kalg); X509_ALGOR_free(ret); return NULL; }