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/*
* Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/pkcs12.h>
/* Define this to dump decrypted output to files called DERnnn */
/*
* #define OPENSSL_DEBUG_DECRYPT
*/
/*
* Encrypt/Decrypt a buffer based on password and algor, result in a
* OPENSSL_malloc'ed buffer
*/
unsigned char *PKCS12_pbe_crypt(const X509_ALGOR *algor,
const char *pass, int passlen,
const unsigned char *in, int inlen,
unsigned char **data, int *datalen, int en_de)
{
unsigned char *out = NULL;
int outlen, i;
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
goto err;
}
/* Decrypt data */
if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
algor->parameter, ctx, en_de)) {
PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
goto err;
}
if ((out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(ctx)))
== NULL) {
PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_CipherUpdate(ctx, out, &i, in, inlen)) {
OPENSSL_free(out);
out = NULL;
PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT, ERR_R_EVP_LIB);
goto err;
}
outlen = i;
if (!EVP_CipherFinal_ex(ctx, out + i, &i)) {
OPENSSL_free(out);
out = NULL;
PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,
PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
goto err;
}
outlen += i;
if (datalen)
*datalen = outlen;
if (data)
*data = out;
err:
EVP_CIPHER_CTX_free(ctx);
return out;
}
/*
* Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
* after use.
*/
void *PKCS12_item_decrypt_d2i(const X509_ALGOR *algor, const ASN1_ITEM *it,
const char *pass, int passlen,
const ASN1_OCTET_STRING *oct, int zbuf)
{
unsigned char *out;
const unsigned char *p;
void *ret;
int outlen;
if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
&out, &outlen, 0)) {
PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,
PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
return NULL;
}
p = out;
#ifdef OPENSSL_DEBUG_DECRYPT
{
FILE *op;
char fname[30];
static int fnm = 1;
sprintf(fname, "DER%d", fnm++);
op = fopen(fname, "wb");
fwrite(p, 1, outlen, op);
fclose(op);
}
#endif
ret = ASN1_item_d2i(NULL, &p, outlen, it);
if (zbuf)
OPENSSL_cleanse(out, outlen);
if (!ret)
PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I, PKCS12_R_DECODE_ERROR);
OPENSSL_free(out);
return ret;
}
/*
* Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero
* encoding.
*/
ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
const ASN1_ITEM *it,
const char *pass, int passlen,
void *obj, int zbuf)
{
ASN1_OCTET_STRING *oct = NULL;
unsigned char *in = NULL;
int inlen;
if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, ERR_R_MALLOC_FAILURE);
goto err;
}
inlen = ASN1_item_i2d(obj, &in, it);
if (!in) {
PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCODE_ERROR);
goto err;
}
if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
&oct->length, 1)) {
PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT, PKCS12_R_ENCRYPT_ERROR);
OPENSSL_free(in);
goto err;
}
if (zbuf)
OPENSSL_cleanse(in, inlen);
OPENSSL_free(in);
return oct;
err:
ASN1_OCTET_STRING_free(oct);
return NULL;
}
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