1 /* 2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include "internal/cryptlib.h" 13 #include <openssl/x509.h> 14 #include <openssl/evp.h> 15 16 /* 17 * Doesn't do anything now: Builtin PBE algorithms in static table. 18 */ 19 20 void PKCS5_PBE_add(void) 21 { 22 } 23 24 int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen, 25 ASN1_TYPE *param, const EVP_CIPHER *cipher, 26 const EVP_MD *md, int en_de) 27 { 28 EVP_MD_CTX *ctx; 29 unsigned char md_tmp[EVP_MAX_MD_SIZE]; 30 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH]; 31 int i; 32 PBEPARAM *pbe; 33 int saltlen, iter; 34 unsigned char *salt; 35 int mdsize; 36 int rv = 0; 37 38 /* Extract useful info from parameter */ 39 if (param == NULL || param->type != V_ASN1_SEQUENCE || 40 param->value.sequence == NULL) { 41 EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR); 42 return 0; 43 } 44 45 pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param); 46 if (pbe == NULL) { 47 EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR); 48 return 0; 49 } 50 51 if (!pbe->iter) 52 iter = 1; 53 else 54 iter = ASN1_INTEGER_get(pbe->iter); 55 salt = pbe->salt->data; 56 saltlen = pbe->salt->length; 57 58 if (!pass) 59 passlen = 0; 60 else if (passlen == -1) 61 passlen = strlen(pass); 62 63 ctx = EVP_MD_CTX_new(); 64 if (ctx == NULL) { 65 EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE); 66 goto err; 67 } 68 69 if (!EVP_DigestInit_ex(ctx, md, NULL)) 70 goto err; 71 if (!EVP_DigestUpdate(ctx, pass, passlen)) 72 goto err; 73 if (!EVP_DigestUpdate(ctx, salt, saltlen)) 74 goto err; 75 PBEPARAM_free(pbe); 76 if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL)) 77 goto err; 78 mdsize = EVP_MD_size(md); 79 if (mdsize < 0) 80 return 0; 81 for (i = 1; i < iter; i++) { 82 if (!EVP_DigestInit_ex(ctx, md, NULL)) 83 goto err; 84 if (!EVP_DigestUpdate(ctx, md_tmp, mdsize)) 85 goto err; 86 if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL)) 87 goto err; 88 } 89 OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp)); 90 memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher)); 91 OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16); 92 memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)), 93 EVP_CIPHER_iv_length(cipher)); 94 if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de)) 95 goto err; 96 OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE); 97 OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH); 98 OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH); 99 rv = 1; 100 err: 101 EVP_MD_CTX_free(ctx); 102 return rv; 103 } 104