| 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/pkcs12.h>
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| 13 |
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| 14 | /* Define this to dump decrypted output to files called DERnnn */
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| 15 | /*
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| 16 | * #define OPENSSL_DEBUG_DECRYPT
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| 17 | */
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| 18 |
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| 19 | /*
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| 20 | * Encrypt/Decrypt a buffer based on password and algor, result in a
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| 21 | * OPENSSL_malloc'ed buffer
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| 22 | */
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| 23 | unsigned char *PKCS12_pbe_crypt(const X509_ALGOR *algor,
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| 24 | const char *pass, int passlen,
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| 25 | const unsigned char *in, int inlen,
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| 26 | unsigned char **data, int *datalen, int en_de)
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| 27 | {
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| 28 | unsigned char *out = NULL;
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| 29 | int outlen, i;
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| 30 | EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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| 31 |
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| 32 | if (ctx == NULL) {
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| 33 | PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
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| 34 | goto err;
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| 35 | }
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| 36 |
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| 37 | /* Decrypt data */
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| 38 | if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
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| 39 | algor->parameter, ctx, en_de)) {
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| 40 | PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
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| 41 | PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
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| 42 | goto err;
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| 43 | }
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| 44 |
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| 45 | if ((out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(ctx)))
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| 46 | == NULL) {
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| 47 | PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
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| 48 | goto err;
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| 49 | }
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| 50 |
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| 51 | if (!EVP_CipherUpdate(ctx, out, &i, in, inlen)) {
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| 52 | OPENSSL_free(out);
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| 53 | out = NULL;
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| 54 | PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_EVP_LIB);
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| 55 | goto err;
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| 56 | }
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| 57 |
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| 58 | outlen = i;
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| 59 | if (!EVP_CipherFinal_ex(ctx, out + i, &i)) {
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| 60 | OPENSSL_free(out);
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| 61 | out = NULL;
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| 62 | PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
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| 63 | PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
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| 64 | goto err;
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| 65 | }
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| 66 | outlen += i;
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| 67 | if (datalen)
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| 68 | *datalen = outlen;
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| 69 | if (data)
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| 70 | *data = out;
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| 71 | err:
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| 72 | EVP_CIPHER_CTX_free(ctx);
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| 73 | return out;
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| 74 |
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| 75 | }
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| 76 |
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| 77 | /*
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| 78 | * Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
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| 79 | * after use.
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| 80 | */
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| 81 |
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| 82 | void *PKCS12_item_decrypt_d2i(const X509_ALGOR *algor, const ASN1_ITEM *it,
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| 83 | const char *pass, int passlen,
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| 84 | const ASN1_OCTET_STRING *oct, int zbuf)
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| 85 | {
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| 86 | unsigned char *out;
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| 87 | const unsigned char *p;
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| 88 | void *ret;
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| 89 | int outlen;
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| 90 |
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| 91 | if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
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| 92 | &out, &outlen, 0)) {
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| 93 | PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,
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| 94 | PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
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| 95 | return NULL;
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| 96 | }
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| 97 | p = out;
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| 98 | #ifdef OPENSSL_DEBUG_DECRYPT
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| 99 | {
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| 100 | FILE *op;
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| 101 |
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| 102 | char fname[30];
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| 103 | static int fnm = 1;
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| 104 | sprintf(fname, "DER%d", fnm++);
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| 105 | op = fopen(fname, "wb");
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| 106 | fwrite(p, 1, outlen, op);
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| 107 | fclose(op);
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| 108 | }
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| 109 | #endif
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| 110 | ret = ASN1_item_d2i(NULL, &p, outlen, it);
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| 111 | if (zbuf)
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| 112 | OPENSSL_cleanse(out, outlen);
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| 113 | if (!ret)
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| 114 | PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I, PKCS12_R_DECODE_ERROR);
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| 115 | OPENSSL_free(out);
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| 116 | return ret;
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| 117 | }
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| 118 |
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| 119 | /*
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| 120 | * Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero
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| 121 | * encoding.
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| 122 | */
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| 123 |
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| 124 | ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
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| 125 | const ASN1_ITEM *it,
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| 126 | const char *pass, int passlen,
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| 127 | void *obj, int zbuf)
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| 128 | {
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| 129 | ASN1_OCTET_STRING *oct = NULL;
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| 130 | unsigned char *in = NULL;
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| 131 | int inlen;
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| 132 |
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| 133 | if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
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| 134 | PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, ERR_R_MALLOC_FAILURE);
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| 135 | goto err;
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| 136 | }
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| 137 | inlen = ASN1_item_i2d(obj, &in, it);
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| 138 | if (!in) {
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| 139 | PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCODE_ERROR);
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| 140 | goto err;
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| 141 | }
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| 142 | if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
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| 143 | &oct->length, 1)) {
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| 144 | PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCRYPT_ERROR);
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| 145 | OPENSSL_free(in);
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| 146 | goto err;
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| 147 | }
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| 148 | if (zbuf)
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| 149 | OPENSSL_cleanse(in, inlen);
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| 150 | OPENSSL_free(in);
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| 151 | return oct;
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| 152 | err:
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| 153 | ASN1_OCTET_STRING_free(oct);
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| 154 | return NULL;
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| 155 | }
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