enc_min.c
/* crypto/evp/enc_min.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif
#include "evp_locl.h"
void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
{
#ifdef OPENSSL_FIPS
FIPS_selftest_check();
#endif
memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
/* ctx->cipher=NULL; */
}
#ifdef OPENSSL_FIPS
/*
* The purpose of these is to trap programs that attempt to use non FIPS
* algorithms in FIPS mode and ignore the errors.
*/
static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
FIPS_ERROR_IGNORED("Cipher init");
return 0;
}
static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
FIPS_ERROR_IGNORED("Cipher update");
return 0;
}
/* NB: no cleanup because it is allowed after failed init */
static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
{
FIPS_ERROR_IGNORED("Cipher set_asn1");
return 0;
}
static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
{
FIPS_ERROR_IGNORED("Cipher get_asn1");
return 0;
}
static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
FIPS_ERROR_IGNORED("Cipher ctrl");
return 0;
}
static const EVP_CIPHER bad_cipher = {
0,
0,
0,
0,
0,
bad_init,
bad_do_cipher,
NULL,
0,
bad_set_asn1,
bad_get_asn1,
bad_ctrl,
NULL
};
#endif
#ifndef OPENSSL_NO_ENGINE
# ifdef OPENSSL_FIPS
static int do_engine_null(ENGINE *impl)
{
return 0;
}
static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx,
const EVP_CIPHER **pciph, ENGINE *impl)
{
return 1;
}
static int (*do_engine_finish) (ENGINE *impl)
= do_engine_null;
static int (*do_evp_enc_engine)
(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)
= do_evp_enc_engine_null;
void int_EVP_CIPHER_set_engine_callbacks(int (*eng_ciph_fin) (ENGINE *impl),
int (*eng_ciph_evp)
(EVP_CIPHER_CTX *ctx,
const EVP_CIPHER **pciph,
ENGINE *impl))
{
do_engine_finish = eng_ciph_fin;
do_evp_enc_engine = eng_ciph_evp;
}
# else
# define do_engine_finish ENGINE_finish
static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher,
ENGINE *impl)
{
if (impl) {
if (!ENGINE_init(impl)) {
EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
return 0;
}
} else
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_cipher_engine((*pcipher)->nid);
if (impl) {
/* There's an ENGINE for this job ... (apparently) */
const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
if (!c) {
/*
* One positive side-effect of US's export control history, is
* that we should at least be able to avoid using US mispellings
* of "initialisation"?
*/
EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
return 0;
}
/* We'll use the ENGINE's private cipher definition */
*pcipher = c;
/*
* Store the ENGINE functional reference so we know 'cipher' came
* from an ENGINE and we need to release it when done.
*/
ctx->engine = impl;
} else
ctx->engine = NULL;
return 1;
}
# endif
#endif
int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
ENGINE *impl, const unsigned char *key,
const unsigned char *iv, int enc)
{
if (enc == -1)
enc = ctx->encrypt;
else {
if (enc)
enc = 1;
ctx->encrypt = enc;
}
#ifdef OPENSSL_FIPS
if (FIPS_selftest_failed()) {
FIPSerr(FIPS_F_EVP_CIPHERINIT_EX, FIPS_R_FIPS_SELFTEST_FAILED);
ctx->cipher = &bad_cipher;
return 0;
}
#endif
#ifndef OPENSSL_NO_ENGINE
/*
* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
* this context may already have an ENGINE! Try to avoid releasing the
* previous handle, re-querying for an ENGINE, and having a
* reinitialisation, when it may all be unecessary.
*/
if (ctx->engine && ctx->cipher && (!cipher ||
(cipher
&& (cipher->nid ==
ctx->cipher->nid))))
goto skip_to_init;
#endif
if (cipher) {
/*
* Ensure a context left lying around from last time is cleared (the
* previous check attempted to avoid this if the same ENGINE and
* EVP_CIPHER could be used).
*/
EVP_CIPHER_CTX_cleanup(ctx);
/* Restore encrypt field: it is zeroed by cleanup */
ctx->encrypt = enc;
#ifndef OPENSSL_NO_ENGINE
if (!do_evp_enc_engine(ctx, &cipher, impl))
return 0;
#endif
ctx->cipher = cipher;
if (ctx->cipher->ctx_size) {
ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size);
if (!ctx->cipher_data) {
EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
return 0;
}
} else {
ctx->cipher_data = NULL;
}
ctx->key_len = cipher->key_len;
ctx->flags = 0;
if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
} else if (!ctx->cipher) {
EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
return 0;
}
#ifndef OPENSSL_NO_ENGINE
skip_to_init:
#endif
/* we assume block size is a power of 2 in *cryptUpdate */
OPENSSL_assert(ctx->cipher->block_size == 1
|| ctx->cipher->block_size == 8
|| ctx->cipher->block_size == 16);
if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
switch (EVP_CIPHER_CTX_mode(ctx)) {
case EVP_CIPH_STREAM_CIPHER:
case EVP_CIPH_ECB_MODE:
break;
case EVP_CIPH_CFB_MODE:
case EVP_CIPH_OFB_MODE:
ctx->num = 0;
/* fall-through */
case EVP_CIPH_CBC_MODE:
OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
(int)sizeof(ctx->iv));
if (iv)
memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
break;
default:
return 0;
break;
}
}
#ifdef OPENSSL_FIPS
/*
* After 'key' is set no further parameters changes are permissible. So
* only check for non FIPS enabling at this point.
*/
if (key && FIPS_mode()) {
if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
& !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) {
EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS);
# if 0
ERR_add_error_data(2, "cipher=", EVP_CIPHER_name(ctx->cipher));
# endif
ctx->cipher = &bad_cipher;
return 0;
}
}
#endif
if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
if (!ctx->cipher->init(ctx, key, iv, enc))
return 0;
}
ctx->buf_len = 0;
ctx->final_used = 0;
ctx->block_mask = ctx->cipher->block_size - 1;
return 1;
}
int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
{
if (c->cipher != NULL) {
if (c->cipher->cleanup && !c->cipher->cleanup(c))
return 0;
/* Cleanse cipher context data */
if (c->cipher_data)
OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
}
if (c->cipher_data)
OPENSSL_free(c->cipher_data);
#ifndef OPENSSL_NO_ENGINE
if (c->engine)
/*
* The EVP_CIPHER we used belongs to an ENGINE, release the
* functional reference we held for this reason.
*/
do_engine_finish(c->engine);
#endif
memset(c, 0, sizeof(EVP_CIPHER_CTX));
return 1;
}
int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
#ifdef OPENSSL_FIPS
FIPS_selftest_check();
#endif
return ctx->cipher->do_cipher(ctx, out, in, inl);
}
int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
int ret;
if (!ctx->cipher) {
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
return 0;
}
if (!ctx->cipher->ctrl) {
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
if (ret == -1) {
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
return 0;
}
return ret;
}
unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
{
return ctx->cipher->flags;
}
int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
{
return ctx->cipher->iv_len;
}
int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
{
return cipher->nid;
}
