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115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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/*
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* Doesn't do anything now: Builtin PBE algorithms in static table.
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*/
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void PKCS5_PBE_add(void)
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{
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}
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int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
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ASN1_TYPE *param, const EVP_CIPHER *cipher,
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const EVP_MD *md, int en_de)
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{
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EVP_MD_CTX *ctx;
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unsigned char md_tmp[EVP_MAX_MD_SIZE];
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unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
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int i, ivl, kl;
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PBEPARAM *pbe;
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int saltlen, iter;
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unsigned char *salt;
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int mdsize;
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int rv = 0;
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/* Extract useful info from parameter */
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if (param == NULL || param->type != V_ASN1_SEQUENCE ||
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param->value.sequence == NULL) {
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EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
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return 0;
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}
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pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
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if (pbe == NULL) {
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EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
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return 0;
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}
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ivl = EVP_CIPHER_iv_length(cipher);
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if (ivl < 0 || ivl > 16) {
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EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_IV_LENGTH);
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PBEPARAM_free(pbe);
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return 0;
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}
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kl = EVP_CIPHER_key_length(cipher);
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if (kl < 0 || kl > (int)sizeof(md_tmp)) {
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EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
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PBEPARAM_free(pbe);
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return 0;
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}
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if (!pbe->iter)
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iter = 1;
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else
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iter = ASN1_INTEGER_get(pbe->iter);
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salt = pbe->salt->data;
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saltlen = pbe->salt->length;
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if (!pass)
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passlen = 0;
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else if (passlen == -1)
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passlen = strlen(pass);
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ctx = EVP_MD_CTX_new();
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if (ctx == NULL) {
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EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EVP_DigestInit_ex(ctx, md, NULL))
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goto err;
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if (!EVP_DigestUpdate(ctx, pass, passlen))
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goto err;
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if (!EVP_DigestUpdate(ctx, salt, saltlen))
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goto err;
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PBEPARAM_free(pbe);
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pbe = NULL;
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if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
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goto err;
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mdsize = EVP_MD_size(md);
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if (mdsize < 0)
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return 0;
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for (i = 1; i < iter; i++) {
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if (!EVP_DigestInit_ex(ctx, md, NULL))
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goto err;
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if (!EVP_DigestUpdate(ctx, md_tmp, mdsize))
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goto err;
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if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
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goto err;
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}
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memcpy(key, md_tmp, kl);
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memcpy(iv, md_tmp + (16 - ivl), ivl);
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if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
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goto err;
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OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
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OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
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OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
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rv = 1;
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err:
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PBEPARAM_free(pbe);
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EVP_MD_CTX_free(ctx);
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return rv;
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}
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