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      1 /* evp_pbe.c */
      2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      3  * project 1999.
      4  */
      5 /* ====================================================================
      6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in
     17  *    the documentation and/or other materials provided with the
     18  *    distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this
     21  *    software must display the following acknowledgment:
     22  *    "This product includes software developed by the OpenSSL Project
     23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     24  *
     25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     26  *    endorse or promote products derived from this software without
     27  *    prior written permission. For written permission, please contact
     28  *    licensing (at) OpenSSL.org.
     29  *
     30  * 5. Products derived from this software may not be called "OpenSSL"
     31  *    nor may "OpenSSL" appear in their names without prior written
     32  *    permission of the OpenSSL Project.
     33  *
     34  * 6. Redistributions of any form whatsoever must retain the following
     35  *    acknowledgment:
     36  *    "This product includes software developed by the OpenSSL Project
     37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     38  *
     39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     50  * OF THE POSSIBILITY OF SUCH DAMAGE.
     51  * ====================================================================
     52  *
     53  * This product includes cryptographic software written by Eric Young
     54  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     55  * Hudson (tjh (at) cryptsoft.com).
     56  *
     57  */
     58 
     59 #include <stdio.h>
     60 #include "cryptlib.h"
     61 #include <openssl/evp.h>
     62 #include <openssl/x509.h>
     63 
     64 /* Password based encryption (PBE) functions */
     65 
     66 static STACK *pbe_algs;
     67 
     68 /* Setup a cipher context from a PBE algorithm */
     69 
     70 typedef struct {
     71 int pbe_nid;
     72 const EVP_CIPHER *cipher;
     73 const EVP_MD *md;
     74 EVP_PBE_KEYGEN *keygen;
     75 } EVP_PBE_CTL;
     76 
     77 int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
     78 	     ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
     79 {
     80 
     81 	EVP_PBE_CTL *pbetmp, pbelu;
     82 	int i;
     83 	pbelu.pbe_nid = OBJ_obj2nid(pbe_obj);
     84 	if (pbelu.pbe_nid != NID_undef) i = sk_find(pbe_algs, (char *)&pbelu);
     85 	else i = -1;
     86 
     87 	if (i == -1) {
     88 		char obj_tmp[80];
     89 		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_UNKNOWN_PBE_ALGORITHM);
     90 		if (!pbe_obj) BUF_strlcpy (obj_tmp, "NULL", sizeof obj_tmp);
     91 		else i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
     92 		ERR_add_error_data(2, "TYPE=", obj_tmp);
     93 		return 0;
     94 	}
     95 	if(!pass) passlen = 0;
     96 	else if (passlen == -1) passlen = strlen(pass);
     97 	pbetmp = (EVP_PBE_CTL *)sk_value (pbe_algs, i);
     98 	i = (*pbetmp->keygen)(ctx, pass, passlen, param, pbetmp->cipher,
     99 						 pbetmp->md, en_de);
    100 	if (!i) {
    101 		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_KEYGEN_FAILURE);
    102 		return 0;
    103 	}
    104 	return 1;
    105 }
    106 
    107 static int pbe_cmp(const char * const *a, const char * const *b)
    108 {
    109 	const EVP_PBE_CTL * const *pbe1 = (const EVP_PBE_CTL * const *) a,
    110 			* const *pbe2 = (const EVP_PBE_CTL * const *)b;
    111 	return ((*pbe1)->pbe_nid - (*pbe2)->pbe_nid);
    112 }
    113 
    114 /* Add a PBE algorithm */
    115 
    116 int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
    117 	     EVP_PBE_KEYGEN *keygen)
    118 {
    119 	EVP_PBE_CTL *pbe_tmp;
    120 	if (!pbe_algs) pbe_algs = sk_new(pbe_cmp);
    121 	if (!(pbe_tmp = (EVP_PBE_CTL*) OPENSSL_malloc (sizeof(EVP_PBE_CTL)))) {
    122 		EVPerr(EVP_F_EVP_PBE_ALG_ADD,ERR_R_MALLOC_FAILURE);
    123 		return 0;
    124 	}
    125 	pbe_tmp->pbe_nid = nid;
    126 	pbe_tmp->cipher = cipher;
    127 	pbe_tmp->md = md;
    128 	pbe_tmp->keygen = keygen;
    129 	sk_push (pbe_algs, (char *)pbe_tmp);
    130 	return 1;
    131 }
    132 
    133 void EVP_PBE_cleanup(void)
    134 {
    135 	sk_pop_free(pbe_algs, OPENSSL_freeFunc);
    136 	pbe_algs = NULL;
    137 }
    138