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openssl/providers/common/ciphers/aes.c
Matt Caswell 344cfa34e5 Add iv length and key length params to the cipher init calls 
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8700)
2019-04-19 09:31:54 +01:00

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/*
* Copyright 2019 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 <string.h>
#include <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/evp.h>
#include <openssl/params.h>
#include "internal/cryptlib.h"
#include "internal/provider_algs.h"
#include "ciphers_locl.h"
static int PROV_AES_KEY_generic_init(PROV_AES_KEY *ctx,
const unsigned char *iv,
size_t ivlen,
int enc)
{
if (iv != NULL && ctx->mode != EVP_CIPH_ECB_MODE) {
if (ivlen != AES_BLOCK_SIZE)
return 0;
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
}
ctx->enc = enc;
return 1;
}
static int aes_einit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
if (!PROV_AES_KEY_generic_init(ctx, iv, ivlen, 1))
return 0;
if (key != NULL) {
if (keylen != ctx->keylen)
return 0;
return ctx->ciph->init(ctx, key, ctx->keylen);
}
return 1;
}
static int aes_dinit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
if (!PROV_AES_KEY_generic_init(ctx, iv, ivlen, 0))
return 0;
if (key != NULL) {
if (keylen != ctx->keylen)
return 0;
return ctx->ciph->init(ctx, key, ctx->keylen);
}
return 1;
}
static int aes_block_update(void *vctx, unsigned char *out, size_t *outl,
const unsigned char *in, size_t inl)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
size_t nextblocks = fillblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE, &in,
&inl);
size_t outlint = 0;
/*
* If we're decrypting and we end an update on a block boundary we hold
* the last block back in case this is the last update call and the last
* block is padded.
*/
if (ctx->bufsz == AES_BLOCK_SIZE
&& (ctx->enc || inl > 0 || !ctx->pad)) {
if (!ctx->ciph->cipher(ctx, out, ctx->buf, AES_BLOCK_SIZE))
return 0;
ctx->bufsz = 0;
outlint = AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
}
if (nextblocks > 0) {
if (!ctx->enc && ctx->pad && nextblocks == inl) {
if (!ossl_assert(inl >= AES_BLOCK_SIZE))
return 0;
nextblocks -= AES_BLOCK_SIZE;
}
if (!ctx->ciph->cipher(ctx, out, in, nextblocks))
return 0;
in += nextblocks;
inl -= nextblocks;
outlint += nextblocks;
}
if (!trailingdata(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE, &in, &inl))
return 0;
*outl = outlint;
return inl == 0;
}
static int aes_block_final(void *vctx, unsigned char *out, size_t *outl)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
if (ctx->enc) {
if (ctx->pad) {
padblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE);
} else if (ctx->bufsz == 0) {
*outl = 0;
return 1;
} else if (ctx->bufsz != AES_BLOCK_SIZE) {
/* TODO(3.0): What is the correct error code here? */
return 0;
}
if (!ctx->ciph->cipher(ctx, out, ctx->buf, AES_BLOCK_SIZE))
return 0;
ctx->bufsz = 0;
*outl = AES_BLOCK_SIZE;
return 1;
}
/* Decrypting */
/* TODO(3.0): What's the correct error here */
if (ctx->bufsz != AES_BLOCK_SIZE) {
if (ctx->bufsz == 0 && !ctx->pad) {
*outl = 0;
return 1;
}
return 0;
}
if (!ctx->ciph->cipher(ctx, ctx->buf, ctx->buf, AES_BLOCK_SIZE))
return 0;
/* TODO(3.0): What is the correct error here */
if (ctx->pad && !unpadblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE))
return 0;
memcpy(out, ctx->buf, ctx->bufsz);
*outl = ctx->bufsz;
ctx->bufsz = 0;
return 1;
}
static int aes_stream_update(void *vctx, unsigned char *out, size_t *outl,
const unsigned char *in, size_t inl)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
if (!ctx->ciph->cipher(ctx, out, in, inl))
return 0;
*outl = inl;
return 1;
}
static int aes_stream_final(void *vctx, unsigned char *out, size_t *outl)
{
*outl = 0;
return 1;
}
static int aes_cipher(void *vctx, unsigned char *out, const unsigned char *in,
size_t inl)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
if (!ctx->ciph->cipher(ctx, out, in, inl))
return 0;
return 1;
}
#define IMPLEMENT_new_params(lcmode, UCMODE) \
static int aes_##lcmode##_get_params(const OSSL_PARAM params[]) \
{ \
const OSSL_PARAM *p; \
\
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_MODE); \
if (p != NULL && !OSSL_PARAM_set_int(p, EVP_CIPH_##UCMODE##_MODE)) \
return 0; \
\
return 1; \
}
#define IMPLEMENT_new_ctx(lcmode, UCMODE, len) \
static void *aes_##len##_##lcmode##_newctx(void) \
{ \
PROV_AES_KEY *ctx = OPENSSL_zalloc(sizeof(*ctx)); \
\
ctx->pad = 1; \
ctx->keylen = (len / 8); \
ctx->ciph = PROV_AES_CIPHER_##lcmode(); \
ctx->mode = EVP_CIPH_##UCMODE##_MODE; \
return ctx; \
}
/* ECB */
IMPLEMENT_new_params(ecb, ECB)
IMPLEMENT_new_ctx(ecb, ECB, 256)
IMPLEMENT_new_ctx(ecb, ECB, 192)
IMPLEMENT_new_ctx(ecb, ECB, 128)
/* CBC */
IMPLEMENT_new_params(cbc, CBC)
IMPLEMENT_new_ctx(cbc, CBC, 256)
IMPLEMENT_new_ctx(cbc, CBC, 192)
IMPLEMENT_new_ctx(cbc, CBC, 128)
/* OFB */
IMPLEMENT_new_params(ofb, OFB)
IMPLEMENT_new_ctx(ofb, OFB, 256)
IMPLEMENT_new_ctx(ofb, OFB, 192)
IMPLEMENT_new_ctx(ofb, OFB, 128)
/* CFB */
IMPLEMENT_new_params(cfb, CFB)
IMPLEMENT_new_params(cfb1, CFB)
IMPLEMENT_new_params(cfb8, CFB)
IMPLEMENT_new_ctx(cfb, CFB, 256)
IMPLEMENT_new_ctx(cfb, CFB, 192)
IMPLEMENT_new_ctx(cfb, CFB, 128)
IMPLEMENT_new_ctx(cfb1, CFB, 256)
IMPLEMENT_new_ctx(cfb1, CFB, 192)
IMPLEMENT_new_ctx(cfb1, CFB, 128)
IMPLEMENT_new_ctx(cfb8, CFB, 256)
IMPLEMENT_new_ctx(cfb8, CFB, 192)
IMPLEMENT_new_ctx(cfb8, CFB, 128)
/* CTR */
IMPLEMENT_new_params(ctr, CTR)
IMPLEMENT_new_ctx(ctr, CTR, 256)
IMPLEMENT_new_ctx(ctr, CTR, 192)
IMPLEMENT_new_ctx(ctr, CTR, 128)
static void aes_freectx(void *vctx)
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
static void *aes_dupctx(void *ctx)
{
PROV_AES_KEY *in = (PROV_AES_KEY *)ctx;
PROV_AES_KEY *ret = OPENSSL_malloc(sizeof(*ret));
*ret = *in;
return ret;
}
static size_t key_length_256(void)
{
return 256 / 8;
}
static size_t key_length_192(void)
{
return 192 / 8;
}
static size_t key_length_128(void)
{
return 128 / 8;
}
static size_t iv_length_16(void)
{
return 16;
}
static size_t iv_length_0(void)
{
return 0;
}
static size_t block_size_16(void)
{
return 16;
}
static size_t block_size_1(void)
{
return 1;
}
static int aes_ctx_get_params(void *vctx, const OSSL_PARAM params[])
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_PADDING);
if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->pad))
return 0;
return 1;
}
static int aes_ctx_set_params(void *vctx, const OSSL_PARAM params[])
{
PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_PADDING);
if (p != NULL) {
int pad;
if (!OSSL_PARAM_get_int(p, &pad))
return 0;
ctx->pad = pad ? 1 : 0;
}
return 1;
}
#define IMPLEMENT_block_funcs(mode, keylen, ivlen) \
const OSSL_DISPATCH aes##keylen##mode##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##keylen##_##mode##_newctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_block_update }, \
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_block_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_cipher }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_dupctx }, \
{ OSSL_FUNC_CIPHER_KEY_LENGTH, (void (*)(void))key_length_##keylen }, \
{ OSSL_FUNC_CIPHER_IV_LENGTH, (void (*)(void))iv_length_##ivlen }, \
{ OSSL_FUNC_CIPHER_BLOCK_SIZE, (void (*)(void))block_size_16 }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))aes_##mode##_get_params }, \
{ OSSL_FUNC_CIPHER_CTX_GET_PARAMS, (void (*)(void))aes_ctx_get_params }, \
{ OSSL_FUNC_CIPHER_CTX_SET_PARAMS, (void (*)(void))aes_ctx_set_params }, \
{ 0, NULL } \
};
#define IMPLEMENT_stream_funcs(mode, keylen, ivlen) \
const OSSL_DISPATCH aes##keylen##mode##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##keylen##_##mode##_newctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_stream_update }, \
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_stream_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_cipher }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_dupctx }, \
{ OSSL_FUNC_CIPHER_KEY_LENGTH, (void (*)(void))key_length_##keylen }, \
{ OSSL_FUNC_CIPHER_IV_LENGTH, (void (*)(void))iv_length_##ivlen }, \
{ OSSL_FUNC_CIPHER_BLOCK_SIZE, (void (*)(void))block_size_1 }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))aes_##mode##_get_params }, \
{ OSSL_FUNC_CIPHER_CTX_GET_PARAMS, (void (*)(void))aes_ctx_get_params }, \
{ OSSL_FUNC_CIPHER_CTX_SET_PARAMS, (void (*)(void))aes_ctx_set_params }, \
{ 0, NULL } \
};
/* ECB */
IMPLEMENT_block_funcs(ecb, 256, 0)
IMPLEMENT_block_funcs(ecb, 192, 0)
IMPLEMENT_block_funcs(ecb, 128, 0)
/* CBC */
IMPLEMENT_block_funcs(cbc, 256, 16)
IMPLEMENT_block_funcs(cbc, 192, 16)
IMPLEMENT_block_funcs(cbc, 128, 16)
/* OFB */
IMPLEMENT_stream_funcs(ofb, 256, 16)
IMPLEMENT_stream_funcs(ofb, 192, 16)
IMPLEMENT_stream_funcs(ofb, 128, 16)
/* CFB */
IMPLEMENT_stream_funcs(cfb, 256, 16)
IMPLEMENT_stream_funcs(cfb, 192, 16)
IMPLEMENT_stream_funcs(cfb, 128, 16)
IMPLEMENT_stream_funcs(cfb1, 256, 16)
IMPLEMENT_stream_funcs(cfb1, 192, 16)
IMPLEMENT_stream_funcs(cfb1, 128, 16)
IMPLEMENT_stream_funcs(cfb8, 256, 16)
IMPLEMENT_stream_funcs(cfb8, 192, 16)
IMPLEMENT_stream_funcs(cfb8, 128, 16)
/* CTR */
IMPLEMENT_stream_funcs(ctr, 256, 16)
IMPLEMENT_stream_funcs(ctr, 192, 16)
IMPLEMENT_stream_funcs(ctr, 128, 16)
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