p12_decr.c
/*
* Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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>
#include <openssl/trace.h>
/*
* Encrypt/Decrypt a buffer based on password and algor, result in a
* OPENSSL_malloc'ed buffer
*/
unsigned char *PKCS12_pbe_crypt_ex(const X509_ALGOR *algor,
const char *pass, int passlen,
const unsigned char *in, int inlen,
unsigned char **data, int *datalen, int en_de,
OSSL_LIB_CTX *libctx, const char *propq)
{
unsigned char *out = NULL;
int outlen, i;
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
int max_out_len, mac_len = 0;
if (ctx == NULL) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_EVP_LIB);
goto err;
}
/* Process data */
if (!EVP_PBE_CipherInit_ex(algor->algorithm, pass, passlen,
algor->parameter, ctx, en_de, libctx, propq))
goto err;
/*
* GOST algorithm specifics:
* OMAC algorithm calculate and encrypt MAC of the encrypted objects
* It's appended to encrypted text on encrypting
* MAC should be processed on decrypting separately from plain text
*/
max_out_len = inlen + EVP_CIPHER_CTX_get_block_size(ctx);
if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))
& EVP_CIPH_FLAG_CIPHER_WITH_MAC) != 0) {
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_TLS1_AAD, 0, &mac_len) < 0) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);
goto err;
}
if (EVP_CIPHER_CTX_is_encrypting(ctx)) {
max_out_len += mac_len;
} else {
if (inlen < mac_len) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_UNSUPPORTED_PKCS12_MODE);
goto err;
}
inlen -= mac_len;
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
(int)mac_len, (unsigned char *)in+inlen) < 0) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);
goto err;
}
}
}
if ((out = OPENSSL_malloc(max_out_len)) == NULL)
goto err;
if (!EVP_CipherUpdate(ctx, out, &i, in, inlen)) {
OPENSSL_free(out);
out = NULL;
ERR_raise(ERR_LIB_PKCS12, ERR_R_EVP_LIB);
goto err;
}
outlen = i;
if (!EVP_CipherFinal_ex(ctx, out + i, &i)) {
OPENSSL_free(out);
out = NULL;
ERR_raise_data(ERR_LIB_PKCS12, PKCS12_R_PKCS12_CIPHERFINAL_ERROR,
passlen == 0 ? "empty password"
: "maybe wrong password");
goto err;
}
outlen += i;
if ((EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(ctx))
& EVP_CIPH_FLAG_CIPHER_WITH_MAC) != 0) {
if (EVP_CIPHER_CTX_is_encrypting(ctx)) {
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG,
(int)mac_len, out+outlen) < 0) {
OPENSSL_free(out);
out = NULL;
ERR_raise(ERR_LIB_PKCS12, ERR_R_INTERNAL_ERROR);
goto err;
}
outlen += mac_len;
}
}
if (datalen)
*datalen = outlen;
if (data)
*data = out;
err:
EVP_CIPHER_CTX_free(ctx);
return out;
}
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)
{
return PKCS12_pbe_crypt_ex(algor, pass, passlen, in, inlen, data, datalen,
en_de, NULL, NULL);
}
/*
* Decrypt an OCTET STRING and decode ASN1 structure if zbuf set zero buffer
* after use.
*/
void *PKCS12_item_decrypt_d2i_ex(const X509_ALGOR *algor, const ASN1_ITEM *it,
const char *pass, int passlen,
const ASN1_OCTET_STRING *oct, int zbuf,
OSSL_LIB_CTX *libctx,
const char *propq)
{
unsigned char *out = NULL;
const unsigned char *p;
void *ret;
int outlen = 0;
if (!PKCS12_pbe_crypt_ex(algor, pass, passlen, oct->data, oct->length,
&out, &outlen, 0, libctx, propq))
return NULL;
p = out;
OSSL_TRACE_BEGIN(PKCS12_DECRYPT) {
BIO_printf(trc_out, "\n");
BIO_dump(trc_out, out, outlen);
BIO_printf(trc_out, "\n");
} OSSL_TRACE_END(PKCS12_DECRYPT);
ret = ASN1_item_d2i(NULL, &p, outlen, it);
if (zbuf)
OPENSSL_cleanse(out, outlen);
if (!ret)
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);
OPENSSL_free(out);
return ret;
}
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)
{
return PKCS12_item_decrypt_d2i_ex(algor, it, pass, passlen, oct, zbuf,
NULL, NULL);
}
/*
* Encode ASN1 structure and encrypt, return OCTET STRING if zbuf set zero
* encoding.
*/
ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt_ex(X509_ALGOR *algor,
const ASN1_ITEM *it,
const char *pass, int passlen,
void *obj, int zbuf,
OSSL_LIB_CTX *ctx,
const char *propq)
{
ASN1_OCTET_STRING *oct = NULL;
unsigned char *in = NULL;
int inlen;
if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_ASN1_LIB);
goto err;
}
inlen = ASN1_item_i2d(obj, &in, it);
if (!in) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_ENCODE_ERROR);
goto err;
}
if (!PKCS12_pbe_crypt_ex(algor, pass, passlen, in, inlen, &oct->data,
&oct->length, 1, ctx, propq)) {
ERR_raise(ERR_LIB_PKCS12, 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;
}
ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
const ASN1_ITEM *it,
const char *pass, int passlen,
void *obj, int zbuf)
{
return PKCS12_item_i2d_encrypt_ex(algor, it, pass, passlen, obj, zbuf, NULL, NULL);
}
