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/*
* Copyright 2019-2021 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
*/
/*
* AES low level APIs are deprecated for public use, but still ok for internal
* use where we're using them to implement the higher level EVP interface, as is
* the case here.
*/
#include "internal/deprecated.h"
#include <openssl/proverr.h>
#include "cipher_aes_ocb.h"
#include "prov/providercommon.h"
#include "prov/ciphercommon_aead.h"
#include "prov/implementations.h"
#define AES_OCB_FLAGS AEAD_FLAGS
#define OCB_DEFAULT_TAG_LEN 16
#define OCB_DEFAULT_IV_LEN 12
#define OCB_MIN_IV_LEN 1
#define OCB_MAX_IV_LEN 15
PROV_CIPHER_FUNC(int, ocb_cipher, (PROV_AES_OCB_CTX *ctx,
const unsigned char *in, unsigned char *out,
size_t nextblock));
/* forward declarations */
static OSSL_FUNC_cipher_encrypt_init_fn aes_ocb_einit;
static OSSL_FUNC_cipher_decrypt_init_fn aes_ocb_dinit;
static OSSL_FUNC_cipher_update_fn aes_ocb_block_update;
static OSSL_FUNC_cipher_final_fn aes_ocb_block_final;
static OSSL_FUNC_cipher_cipher_fn aes_ocb_cipher;
static OSSL_FUNC_cipher_freectx_fn aes_ocb_freectx;
static OSSL_FUNC_cipher_dupctx_fn aes_ocb_dupctx;
static OSSL_FUNC_cipher_get_ctx_params_fn aes_ocb_get_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn aes_ocb_set_ctx_params;
static OSSL_FUNC_cipher_gettable_ctx_params_fn cipher_ocb_gettable_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn cipher_ocb_settable_ctx_params;
/*
* The following methods could be moved into PROV_AES_OCB_HW if
* multiple hardware implementations are ever needed.
*/
static ossl_inline int aes_generic_ocb_setiv(PROV_AES_OCB_CTX *ctx,
const unsigned char *iv,
size_t ivlen, size_t taglen)
{
return (CRYPTO_ocb128_setiv(&ctx->ocb, iv, ivlen, taglen) == 1);
}
static ossl_inline int aes_generic_ocb_setaad(PROV_AES_OCB_CTX *ctx,
const unsigned char *aad,
size_t alen)
{
return CRYPTO_ocb128_aad(&ctx->ocb, aad, alen) == 1;
}
static ossl_inline int aes_generic_ocb_gettag(PROV_AES_OCB_CTX *ctx,
unsigned char *tag, size_t tlen)
{
return CRYPTO_ocb128_tag(&ctx->ocb, tag, tlen) > 0;
}
static ossl_inline int aes_generic_ocb_final(PROV_AES_OCB_CTX *ctx)
{
return (CRYPTO_ocb128_finish(&ctx->ocb, ctx->tag, ctx->taglen) == 0);
}
static ossl_inline void aes_generic_ocb_cleanup(PROV_AES_OCB_CTX *ctx)
{
CRYPTO_ocb128_cleanup(&ctx->ocb);
}
static ossl_inline int aes_generic_ocb_cipher(PROV_AES_OCB_CTX *ctx,
const unsigned char *in,
unsigned char *out, size_t len)
{
if (ctx->base.enc) {
if (!CRYPTO_ocb128_encrypt(&ctx->ocb, in, out, len))
return 0;
} else {
if (!CRYPTO_ocb128_decrypt(&ctx->ocb, in, out, len))
return 0;
}
return 1;
}
static ossl_inline int aes_generic_ocb_copy_ctx(PROV_AES_OCB_CTX *dst,
PROV_AES_OCB_CTX *src)
{
return CRYPTO_ocb128_copy_ctx(&dst->ocb, &src->ocb,
&dst->ksenc.ks, &dst->ksdec.ks);
}
/*-
* Provider dispatch functions
*/
static int aes_ocb_init(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen, int enc)
{
PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
if (!ossl_prov_is_running())
return 0;
ctx->aad_buf_len = 0;
ctx->data_buf_len = 0;
ctx->base.enc = enc;
if (iv != NULL) {
if (ivlen != ctx->base.ivlen) {
/* IV len must be 1 to 15 */
if (ivlen < OCB_MIN_IV_LEN || ivlen > OCB_MAX_IV_LEN) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
return 0;
}
ctx->base.ivlen = ivlen;
}
if (!ossl_cipher_generic_initiv(&ctx->base, iv, ivlen))
return 0;
ctx->iv_state = IV_STATE_BUFFERED;
}
if (key != NULL) {
if (keylen != ctx->base.keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
return ctx->base.hw->init(&ctx->base, key, keylen);
}
return 1;
}
static int aes_ocb_einit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
return aes_ocb_init(vctx, key, keylen, iv, ivlen, 1);
}
static int aes_ocb_dinit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
return aes_ocb_init(vctx, key, keylen, iv, ivlen, 0);
}
/*
* Because of the way OCB works, both the AAD and data are buffered in the
* same way. Only the last block can be a partial block.
*/
static int aes_ocb_block_update_internal(PROV_AES_OCB_CTX *ctx,
unsigned char *buf, size_t *bufsz,
unsigned char *out, size_t *outl,
size_t outsize, const unsigned char *in,
size_t inl, OSSL_ocb_cipher_fn ciph)
{
size_t nextblocks;
size_t outlint = 0;
if (*bufsz != 0)
nextblocks = fillblock(buf, bufsz, AES_BLOCK_SIZE, &in, &inl);
else
nextblocks = inl & ~(AES_BLOCK_SIZE-1);
if (*bufsz == AES_BLOCK_SIZE) {
if (outsize < AES_BLOCK_SIZE) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
if (!ciph(ctx, buf, out, AES_BLOCK_SIZE)) {
ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
return 0;
}
*bufsz = 0;
outlint = AES_BLOCK_SIZE;
if (out != NULL)
out += AES_BLOCK_SIZE;
}
if (nextblocks > 0) {
outlint += nextblocks;
if (outsize < outlint) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return 0;
}
if (!ciph(ctx, in, out, nextblocks)) {
ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
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