/*
* Copyright (C) 2010-2012 Free Software Foundation, Inc.
* Copyright (C) 2014 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
/* Here lie nettle's wrappers for cipher support.
*/
#include "gnutls_int.h"
#include "errors.h"
#include <cipher_int.h>
#include <nettle/aes.h>
#include <nettle/camellia.h>
#include <nettle/arcfour.h>
#include <nettle/arctwo.h>
#include <nettle/salsa20.h>
#include <nettle/des.h>
#include <nettle/version.h>
#if ENABLE_GOST
#ifndef HAVE_NETTLE_GOST28147_SET_KEY
#include "gost/gost28147.h"
#else
#include <nettle/gost28147.h>
#endif
#endif
#include <nettle/nettle-meta.h>
#include <nettle/cbc.h>
#include <nettle/gcm.h>
#include <nettle/ccm.h>
#ifdef HAVE_NETTLE_CHACHA_SET_COUNTER
#include <nettle/chacha.h>
#include <nettle/chacha-poly1305.h>
#else
#include "chacha.h"
#include "chacha-poly1305.h"
#endif
#ifdef HAVE_NETTLE_CFB8_ENCRYPT
#include <nettle/cfb.h>
#else
#include "cfb.h"
#endif /* HAVE_NETTLE_CFB8_ENCRYPT */
#ifdef HAVE_NETTLE_XTS_ENCRYPT_MESSAGE
#include <nettle/xts.h>
#else
#include "xts.h"
#endif
#ifdef HAVE_NETTLE_SIV_CMAC_AES128_SET_KEY
#include <nettle/siv-cmac.h>
#else
#include "siv-cmac.h"
#endif
#include <fips.h>
struct nettle_cipher_ctx;
/* Functions that refer to the nettle library.
*/
typedef void (*encrypt_func) (struct nettle_cipher_ctx*,
size_t length,
uint8_t * dst,
const uint8_t * src);
typedef void (*decrypt_func) (struct nettle_cipher_ctx*,
size_t length, uint8_t *dst,
const uint8_t *src);
typedef void (*aead_encrypt_func) (struct nettle_cipher_ctx*,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src);
typedef int (*aead_decrypt_func) (struct nettle_cipher_ctx*,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src);
typedef void (*setiv_func) (void *ctx, size_t length, const uint8_t *);
typedef void (*gen_setkey_func) (void *ctx, size_t length, const uint8_t *);
struct nettle_cipher_st {
gnutls_cipher_algorithm_t algo;
unsigned ctx_size;
nettle_cipher_func *encrypt_block;
nettle_cipher_func *decrypt_block;
unsigned block_size;
unsigned key_size;
unsigned max_iv_size;
encrypt_func encrypt;
decrypt_func decrypt;
aead_encrypt_func aead_encrypt;
aead_decrypt_func aead_decrypt;
nettle_hash_update_func* auth;
nettle_hash_digest_func* tag;
nettle_set_key_func* set_encrypt_key;
nettle_set_key_func* set_decrypt_key;
gen_setkey_func gen_set_key; /* for arcfour which has variable key size */
setiv_func set_iv;
};
struct nettle_cipher_ctx {
const struct nettle_cipher_st *cipher;
void *ctx_ptr; /* always 16-aligned */
uint8_t iv[MAX_CIPHER_BLOCK_SIZE];
unsigned iv_size;
bool enc;
};
static void
_stream_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
ctx->cipher->encrypt_block(ctx->ctx_ptr, length, dst, src);
}
static void
_stream_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
ctx->cipher->decrypt_block(ctx->ctx_ptr, length, dst, src);
}
static void
_cbc_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cbc_encrypt(ctx->ctx_ptr, ctx->cipher->encrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
static void
_cbc_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cbc_decrypt(ctx->ctx_ptr, ctx->cipher->decrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
#if ENABLE_GOST
static void
_cfb_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cfb_encrypt(ctx->ctx_ptr, ctx->cipher->encrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
static void
_cfb_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cfb_decrypt(ctx->ctx_ptr, ctx->cipher->encrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
static void
_gost28147_set_key_tc26z(void *ctx, const uint8_t *key)
{
gost28147_set_param(ctx, &gost28147_param_TC26_Z);
gost28147_set_key(ctx, key);
}
static void
_gost28147_set_key_cpa(void *ctx, const uint8_t *key)
{
gost28147_set_param(ctx, &gost28147_param_CryptoPro_A);
gost28147_set_key(ctx, key);
}
static void
_gost28147_set_key_cpb(void *ctx, const uint8_t *key)
{
gost28147_set_param(ctx, &gost28147_param_CryptoPro_B);
gost28147_set_key(ctx, key);
}
static void
_gost28147_set_key_cpc(void *ctx, const uint8_t *key)
{
gost28147_set_param(ctx, &gost28147_param_CryptoPro_C);
gost28147_set_key(ctx, key);
}
static void
_gost28147_set_key_cpd(void *ctx, const uint8_t *key)
{
gost28147_set_param(ctx, &gost28147_param_CryptoPro_D);
gost28147_set_key(ctx, key);
}
static void
_gost28147_cnt_set_key_tc26z(void *ctx, const uint8_t *key)
{
gost28147_cnt_init(ctx, key, &gost28147_param_TC26_Z);
}
static void
_gost28147_cnt_set_nonce (void *ctx, size_t length, const uint8_t *nonce)
{
gost28147_cnt_set_iv (ctx, nonce);
}
static void
_gost28147_cnt_crypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
gost28147_cnt_crypt((void *)ctx->ctx_ptr, length, dst, src);
}
#endif
static void
_ccm_encrypt(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
ccm_encrypt_message((void*)ctx->ctx_ptr, ctx->cipher->encrypt_block,
nonce_size, nonce,
auth_size, auth,
tag_size, length, dst, src);
}
static int
_ccm_decrypt(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
return ccm_decrypt_message((void*)ctx->ctx_ptr, ctx->cipher->encrypt_block,
nonce_size, nonce,
auth_size, auth,
tag_size, length, dst, src);
}
static void
_siv_cmac_aes128_encrypt_message(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
siv_cmac_aes128_encrypt_message((void*)ctx->ctx_ptr,
nonce_size, nonce,
auth_size, auth,
length, dst, src);
}
static int
_siv_cmac_aes128_decrypt_message(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
return siv_cmac_aes128_decrypt_message((void*)ctx->ctx_ptr,
nonce_size, nonce,
auth_size, auth,
length, dst, src);
}
static void
_siv_cmac_aes256_encrypt_message(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
siv_cmac_aes256_encrypt_message((void*)ctx->ctx_ptr,
nonce_size, nonce,
auth_size, auth,
length, dst, src);
}
static int
_siv_cmac_aes256_decrypt_message(struct nettle_cipher_ctx *ctx,
size_t nonce_size, const void *nonce,
size_t auth_size, const void *auth,
size_t tag_size,
size_t length, uint8_t * dst,
const uint8_t * src)
{
return siv_cmac_aes256_decrypt_message((void*)ctx->ctx_ptr,
nonce_size, nonce,
auth_size, auth,
length, dst, src);
}
static void
_chacha_set_nonce(struct chacha_ctx *ctx,
size_t length, const uint8_t *nonce)
{
chacha_set_nonce(ctx, nonce + CHACHA_COUNTER_SIZE);
chacha_set_counter(ctx, nonce);
}
static void
_chacha_set_nonce96(struct chacha_ctx *ctx,
size_t length, const uint8_t *nonce)
{
chacha_set_nonce96(ctx, nonce + CHACHA_COUNTER32_SIZE);
chacha_set_counter32(ctx, nonce);
}
static void
_chacha_poly1305_set_nonce (struct chacha_poly1305_ctx *ctx,
size_t length, const uint8_t *nonce)
{
chacha_poly1305_set_nonce(ctx, nonce);
}
struct gcm_cast_st { struct gcm_key key; struct gcm_ctx gcm; unsigned long xx[1]; };
#define GCM_CTX_GET_KEY(ptr) (&((struct gcm_cast_st*)ptr)->key)
#define GCM_CTX_GET_CTX(ptr) (&((struct gcm_cast_st*)ptr)->gcm)
#define GCM_CTX_GET_CIPHER(ptr) ((void*)&((struct gcm_cast_st*)ptr)->xx)
static void
_gcm_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
gcm_encrypt(GCM_CTX_GET_CTX(ctx->ctx_ptr), GCM_CTX_GET_KEY(ctx->ctx_ptr),
GCM_CTX_GET_CIPHER(ctx->ctx_ptr), ctx->cipher->encrypt_block,
length, dst, src);
}
static void
_gcm_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
gcm_decrypt(GCM_CTX_GET_CTX(ctx->ctx_ptr), GCM_CTX_GET_KEY(ctx->ctx_ptr),
GCM_CTX_GET_CIPHER(ctx->ctx_ptr), ctx->cipher->encrypt_block,
length, dst, src);
}
static void _des_set_key(struct des_ctx *ctx, const uint8_t *key)
{
des_set_key(ctx, key);
}
static void _des3_set_key(struct des3_ctx *ctx, const uint8_t *key)
{
des3_set_key(ctx, key);
}
static void
_cfb8_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cfb8_encrypt(ctx->ctx_ptr, ctx->cipher->encrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
static void
_cfb8_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
cfb8_decrypt(ctx->ctx_ptr, ctx->cipher->encrypt_block,
ctx->iv_size, ctx->iv,
length, dst, src);
}
static void
_xts_aes128_set_encrypt_key(struct xts_aes128_key *xts_key,
const uint8_t *key)
{
if (_gnutls_fips_mode_enabled() &&
safe_memcmp(key, key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
_gnutls_switch_lib_state(LIB_STATE_ERROR);
xts_aes128_set_encrypt_key(xts_key, key);
}
static void
_xts_aes128_set_decrypt_key(struct xts_aes128_key *xts_key,
const uint8_t *key)
{
if (_gnutls_fips_mode_enabled() &&
safe_memcmp(key, key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
_gnutls_switch_lib_state(LIB_STATE_ERROR);
xts_aes128_set_decrypt_key(xts_key, key);
}
static void
_xts_aes256_set_encrypt_key(struct xts_aes256_key *xts_key,
const uint8_t *key)
{
if (_gnutls_fips_mode_enabled() &&
safe_memcmp(key, key + AES256_KEY_SIZE, AES256_KEY_SIZE) == 0)
_gnutls_switch_lib_state(LIB_STATE_ERROR);
xts_aes256_set_encrypt_key(xts_key, key);
}
static void
_xts_aes256_set_decrypt_key(struct xts_aes256_key *xts_key,
const uint8_t *key)
{
if (_gnutls_fips_mode_enabled() &&
safe_memcmp(key, key + AES256_KEY_SIZE, AES256_KEY_SIZE) == 0)
_gnutls_switch_lib_state(LIB_STATE_ERROR);
xts_aes256_set_decrypt_key(xts_key, key);
}
static void
_xts_aes128_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
xts_aes128_encrypt_message(ctx->ctx_ptr, ctx->iv, length, dst, src);
}
static void
_xts_aes128_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
xts_aes128_decrypt_message(ctx->ctx_ptr, ctx->iv, length, dst, src);
}
static void
_xts_aes256_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
xts_aes256_encrypt_message(ctx->ctx_ptr, ctx->iv, length, dst, src);
}
static void
_xts_aes256_decrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
xts_aes256_decrypt_message(ctx->ctx_ptr, ctx->iv, length, dst, src);
}
static const struct nettle_cipher_st builtin_ciphers[] = {
{ .algo = GNUTLS_CIPHER_AES_128_GCM,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes128_encrypt,
.decrypt_block = (nettle_cipher_func*)aes128_decrypt,
.ctx_size = sizeof(struct gcm_aes128_ctx),
.encrypt = _gcm_encrypt,
.decrypt = _gcm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)gcm_aes128_set_key,
.set_decrypt_key = (nettle_set_key_func*)gcm_aes128_set_key,
.tag = (nettle_hash_digest_func*)gcm_aes128_digest,
.auth = (nettle_hash_update_func*)gcm_aes128_update,
.set_iv = (setiv_func)gcm_aes128_set_iv,
.max_iv_size = GCM_IV_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_192_GCM,
.block_size = AES_BLOCK_SIZE,
.key_size = AES192_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes192_encrypt,
.decrypt_block = (nettle_cipher_func*)aes192_decrypt,
.ctx_size = sizeof(struct gcm_aes192_ctx),
.encrypt = _gcm_encrypt,
.decrypt = _gcm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)gcm_aes192_set_key,
.set_decrypt_key = (nettle_set_key_func*)gcm_aes192_set_key,
.tag = (nettle_hash_digest_func*)gcm_aes192_digest,
.auth = (nettle_hash_update_func*)gcm_aes192_update,
.set_iv = (setiv_func)gcm_aes192_set_iv,
.max_iv_size = GCM_IV_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_GCM,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes256_encrypt,
.decrypt_block = (nettle_cipher_func*)aes256_decrypt,
.ctx_size = sizeof(struct gcm_aes256_ctx),
.encrypt = _gcm_encrypt,
.decrypt = _gcm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)gcm_aes256_set_key,
.set_decrypt_key = (nettle_set_key_func*)gcm_aes256_set_key,
.tag = (nettle_hash_digest_func*)gcm_aes256_digest,
.auth = (nettle_hash_update_func*)gcm_aes256_update,
.set_iv = (setiv_func)gcm_aes256_set_iv,
.max_iv_size = GCM_IV_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_128_CCM,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes128_encrypt,
.decrypt_block = (nettle_cipher_func*)aes128_decrypt,
.ctx_size = sizeof(struct aes128_ctx),
.aead_encrypt = _ccm_encrypt,
.aead_decrypt = _ccm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.max_iv_size = CCM_MAX_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_128_CCM_8,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes128_encrypt,
.decrypt_block = (nettle_cipher_func*)aes128_decrypt,
.ctx_size = sizeof(struct aes128_ctx),
.aead_encrypt = _ccm_encrypt,
.aead_decrypt = _ccm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.max_iv_size = CCM_MAX_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_CCM,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes256_encrypt,
.decrypt_block = (nettle_cipher_func*)aes256_decrypt,
.ctx_size = sizeof(struct aes256_ctx),
.aead_encrypt = _ccm_encrypt,
.aead_decrypt = _ccm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.max_iv_size = CCM_MAX_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_CCM_8,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes256_encrypt,
.decrypt_block = (nettle_cipher_func*)aes256_decrypt,
.ctx_size = sizeof(struct aes256_ctx),
.aead_encrypt = _ccm_encrypt,
.aead_decrypt = _ccm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.max_iv_size = CCM_MAX_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_CAMELLIA_128_GCM,
.block_size = CAMELLIA_BLOCK_SIZE,
.key_size = CAMELLIA128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)camellia128_crypt,
.decrypt_block = (nettle_cipher_func*)camellia128_crypt,
.ctx_size = sizeof(struct gcm_camellia128_ctx),
.encrypt = _gcm_encrypt,
.decrypt = _gcm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)gcm_camellia128_set_key,
.set_decrypt_key = (nettle_set_key_func*)gcm_camellia128_set_key,
.tag = (nettle_hash_digest_func*)gcm_camellia128_digest,
.auth = (nettle_hash_update_func*)gcm_camellia128_update,
.max_iv_size = GCM_IV_SIZE,
.set_iv = (setiv_func)gcm_camellia128_set_iv
},
{ .algo = GNUTLS_CIPHER_CAMELLIA_256_GCM,
.block_size = CAMELLIA_BLOCK_SIZE,
.key_size = CAMELLIA256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)camellia256_crypt,
.decrypt_block = (nettle_cipher_func*)camellia256_crypt,
.ctx_size = sizeof(struct gcm_camellia256_ctx),
.encrypt = _gcm_encrypt,
.decrypt = _gcm_decrypt,
.set_encrypt_key = (nettle_set_key_func*)gcm_camellia256_set_key,
.set_decrypt_key = (nettle_set_key_func*)gcm_camellia256_set_key,
.tag = (nettle_hash_digest_func*)gcm_camellia256_digest,
.auth = (nettle_hash_update_func*)gcm_camellia256_update,
.max_iv_size = GCM_IV_SIZE,
.set_iv = (setiv_func)gcm_camellia256_set_iv
},
{ .algo = GNUTLS_CIPHER_AES_128_CBC,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes128_encrypt,
.decrypt_block = (nettle_cipher_func*)aes128_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct aes128_ctx, AES_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes128_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_192_CBC,
.block_size = AES_BLOCK_SIZE,
.key_size = AES192_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes192_encrypt,
.decrypt_block = (nettle_cipher_func*)aes192_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct aes192_ctx, AES_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes192_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes192_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_CBC,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes256_encrypt,
.decrypt_block = (nettle_cipher_func*)aes256_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct aes256_ctx, AES_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes256_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_CAMELLIA_128_CBC,
.block_size = CAMELLIA_BLOCK_SIZE,
.key_size = CAMELLIA128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)camellia128_crypt,
.decrypt_block = (nettle_cipher_func*)camellia128_crypt,
.ctx_size = sizeof(struct CBC_CTX(struct camellia128_ctx, CAMELLIA_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)camellia128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)camellia128_set_decrypt_key,
.max_iv_size = CAMELLIA_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_CAMELLIA_192_CBC,
.block_size = CAMELLIA_BLOCK_SIZE,
.key_size = CAMELLIA192_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)camellia192_crypt,
.decrypt_block = (nettle_cipher_func*)camellia192_crypt,
.ctx_size = sizeof(struct CBC_CTX(struct camellia192_ctx, CAMELLIA_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)camellia192_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)camellia192_set_decrypt_key,
.max_iv_size = CAMELLIA_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_CAMELLIA_256_CBC,
.block_size = CAMELLIA_BLOCK_SIZE,
.key_size = CAMELLIA256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)camellia256_crypt,
.decrypt_block = (nettle_cipher_func*)camellia256_crypt,
.ctx_size = sizeof(struct CBC_CTX(struct camellia256_ctx, CAMELLIA_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)camellia256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)camellia256_set_decrypt_key,
.max_iv_size = CAMELLIA_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_RC2_40_CBC,
.block_size = ARCTWO_BLOCK_SIZE,
.key_size = 5,
.encrypt_block = (nettle_cipher_func*)arctwo_encrypt,
.decrypt_block = (nettle_cipher_func*)arctwo_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct arctwo_ctx, ARCTWO_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)arctwo40_set_key,
.set_decrypt_key = (nettle_set_key_func*)arctwo40_set_key,
.max_iv_size = ARCTWO_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_DES_CBC,
.block_size = DES_BLOCK_SIZE,
.key_size = DES_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)des_encrypt,
.decrypt_block = (nettle_cipher_func*)des_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct des_ctx, DES_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)_des_set_key,
.set_decrypt_key = (nettle_set_key_func*)_des_set_key,
.max_iv_size = DES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_3DES_CBC,
.block_size = DES3_BLOCK_SIZE,
.key_size = DES3_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)des3_encrypt,
.decrypt_block = (nettle_cipher_func*)des3_decrypt,
.ctx_size = sizeof(struct CBC_CTX(struct des3_ctx, DES3_BLOCK_SIZE)),
.encrypt = _cbc_encrypt,
.decrypt = _cbc_decrypt,
.set_encrypt_key = (nettle_set_key_func*)_des3_set_key,
.set_decrypt_key = (nettle_set_key_func*)_des3_set_key,
.max_iv_size = DES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_ARCFOUR_128,
.block_size = 1,
.key_size = 0,
.encrypt_block = (nettle_cipher_func*)arcfour_crypt,
.decrypt_block = (nettle_cipher_func*)arcfour_crypt,
.ctx_size = sizeof(struct arcfour_ctx),
.encrypt = _stream_encrypt,
.decrypt = _stream_encrypt,
.gen_set_key = (gen_setkey_func)arcfour_set_key,
.set_encrypt_key = (nettle_set_key_func*)arcfour128_set_key,
.set_decrypt_key = (nettle_set_key_func*)arcfour128_set_key,
},
{ .algo = GNUTLS_CIPHER_SALSA20_256,
.block_size = 1,
.key_size = SALSA20_256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)salsa20_crypt,
.decrypt_block = (nettle_cipher_func*)salsa20_crypt,
.ctx_size = sizeof(struct salsa20_ctx),
.encrypt = _stream_encrypt,
.decrypt = _stream_encrypt,
.set_encrypt_key = (nettle_set_key_func*)salsa20_256_set_key,
.set_decrypt_key = (nettle_set_key_func*)salsa20_256_set_key,
.max_iv_size = SALSA20_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_ESTREAM_SALSA20_256,
.block_size = 1,
.key_size = SALSA20_256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)salsa20r12_crypt,
.decrypt_block = (nettle_cipher_func*)salsa20r12_crypt,
.ctx_size = sizeof(struct salsa20_ctx),
.encrypt = _stream_encrypt,
.decrypt = _stream_encrypt,
.set_encrypt_key = (nettle_set_key_func*)salsa20_256_set_key,
.set_decrypt_key = (nettle_set_key_func*)salsa20_256_set_key,
.max_iv_size = SALSA20_NONCE_SIZE,
},
{ .algo = GNUTLS_CIPHER_CHACHA20_32,
.block_size = 1,
.key_size = CHACHA_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)chacha_crypt32,
.decrypt_block = (nettle_cipher_func*)chacha_crypt32,
.ctx_size = sizeof(struct chacha_ctx),
.encrypt = _stream_encrypt,
.decrypt = _stream_encrypt,
.set_encrypt_key = (nettle_set_key_func*)chacha_set_key,
.set_decrypt_key = (nettle_set_key_func*)chacha_set_key,
.set_iv = (setiv_func)_chacha_set_nonce96,
/* we allow setting the initial block counter as part of nonce */
.max_iv_size = CHACHA_NONCE96_SIZE + CHACHA_COUNTER32_SIZE,
},
{ .algo = GNUTLS_CIPHER_CHACHA20_64,
.block_size = 1,
.key_size = CHACHA_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)chacha_crypt,
.decrypt_block = (nettle_cipher_func*)chacha_crypt,
.ctx_size = sizeof(struct chacha_ctx),
.encrypt = _stream_encrypt,
.decrypt = _stream_encrypt,
.set_encrypt_key = (nettle_set_key_func*)chacha_set_key,
.set_decrypt_key = (nettle_set_key_func*)chacha_set_key,
.set_iv = (setiv_func)_chacha_set_nonce,
/* we allow setting the initial block counter as part of nonce */
.max_iv_size = CHACHA_NONCE_SIZE + CHACHA_COUNTER_SIZE,
},
{ .algo = GNUTLS_CIPHER_CHACHA20_POLY1305,
.block_size = CHACHA_POLY1305_BLOCK_SIZE,
.key_size = CHACHA_POLY1305_KEY_SIZE,
.ctx_size = sizeof(struct chacha_poly1305_ctx),
.encrypt_block = (nettle_cipher_func*)chacha_poly1305_encrypt,
.decrypt_block = (nettle_cipher_func*)chacha_poly1305_decrypt,
.encrypt = _stream_encrypt,
.decrypt = _stream_decrypt,
.auth = (nettle_hash_update_func*)chacha_poly1305_update,
.tag = (nettle_hash_digest_func*)chacha_poly1305_digest,
.set_encrypt_key = (nettle_set_key_func*)chacha_poly1305_set_key,
.set_decrypt_key = (nettle_set_key_func*)chacha_poly1305_set_key,
.set_iv = (setiv_func)_chacha_poly1305_set_nonce,
.max_iv_size = CHACHA_POLY1305_NONCE_SIZE,
},
#if ENABLE_GOST
{
.algo = GNUTLS_CIPHER_GOST28147_TC26Z_CFB,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.decrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.ctx_size = sizeof(struct CFB_CTX(struct gost28147_ctx, GOST28147_BLOCK_SIZE)),
.encrypt = _cfb_encrypt,
.decrypt = _cfb_decrypt,
.set_encrypt_key = _gost28147_set_key_tc26z,
.set_decrypt_key = _gost28147_set_key_tc26z,
},
{
.algo = GNUTLS_CIPHER_GOST28147_CPA_CFB,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.decrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.ctx_size = sizeof(struct CFB_CTX(struct gost28147_ctx, GOST28147_BLOCK_SIZE)),
.encrypt = _cfb_encrypt,
.decrypt = _cfb_decrypt,
.set_encrypt_key = _gost28147_set_key_cpa,
.set_decrypt_key = _gost28147_set_key_cpa,
},
{
.algo = GNUTLS_CIPHER_GOST28147_CPB_CFB,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.decrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.ctx_size = sizeof(struct CFB_CTX(struct gost28147_ctx, GOST28147_BLOCK_SIZE)),
.encrypt = _cfb_encrypt,
.decrypt = _cfb_decrypt,
.set_encrypt_key = _gost28147_set_key_cpb,
.set_decrypt_key = _gost28147_set_key_cpb,
},
{
.algo = GNUTLS_CIPHER_GOST28147_CPC_CFB,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.decrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.ctx_size = sizeof(struct CFB_CTX(struct gost28147_ctx, GOST28147_BLOCK_SIZE)),
.encrypt = _cfb_encrypt,
.decrypt = _cfb_decrypt,
.set_encrypt_key = _gost28147_set_key_cpc,
.set_decrypt_key = _gost28147_set_key_cpc,
},
{
.algo = GNUTLS_CIPHER_GOST28147_CPD_CFB,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.decrypt_block = (nettle_cipher_func*)gost28147_encrypt_for_cfb,
.ctx_size = sizeof(struct CFB_CTX(struct gost28147_ctx, GOST28147_BLOCK_SIZE)),
.encrypt = _cfb_encrypt,
.decrypt = _cfb_decrypt,
.set_encrypt_key = _gost28147_set_key_cpd,
.set_decrypt_key = _gost28147_set_key_cpd,
},
{
.algo = GNUTLS_CIPHER_GOST28147_TC26Z_CNT,
.block_size = GOST28147_BLOCK_SIZE,
.key_size = GOST28147_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)gost28147_encrypt, /* unused */
.decrypt_block = (nettle_cipher_func*)gost28147_decrypt, /* unused */
.ctx_size = sizeof(struct gost28147_cnt_ctx),
.encrypt = _gost28147_cnt_crypt,
.decrypt = _gost28147_cnt_crypt,
.set_encrypt_key = _gost28147_cnt_set_key_tc26z,
.set_decrypt_key = _gost28147_cnt_set_key_tc26z,
.set_iv = (setiv_func)_gost28147_cnt_set_nonce,
},
#endif
{ .algo = GNUTLS_CIPHER_AES_128_CFB8,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes128_encrypt,
.decrypt_block = (nettle_cipher_func*)aes128_encrypt,
.ctx_size = sizeof(struct CFB8_CTX(struct aes128_ctx, AES_BLOCK_SIZE)),
.encrypt = _cfb8_encrypt,
.decrypt = _cfb8_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes128_set_encrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_192_CFB8,
.block_size = AES_BLOCK_SIZE,
.key_size = AES192_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes192_encrypt,
.decrypt_block = (nettle_cipher_func*)aes192_encrypt,
.ctx_size = sizeof(struct CFB8_CTX(struct aes192_ctx, AES_BLOCK_SIZE)),
.encrypt = _cfb8_encrypt,
.decrypt = _cfb8_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes192_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes192_set_encrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_CFB8,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE,
.encrypt_block = (nettle_cipher_func*)aes256_encrypt,
.decrypt_block = (nettle_cipher_func*)aes256_encrypt,
.ctx_size = sizeof(struct CFB8_CTX(struct aes256_ctx, AES_BLOCK_SIZE)),
.encrypt = _cfb8_encrypt,
.decrypt = _cfb8_decrypt,
.set_encrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)aes256_set_encrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_128_XTS,
.block_size = AES_BLOCK_SIZE,
.key_size = AES128_KEY_SIZE * 2,
.ctx_size = sizeof(struct xts_aes128_key),
.encrypt = _xts_aes128_encrypt,
.decrypt = _xts_aes128_decrypt,
.set_encrypt_key = (nettle_set_key_func*)_xts_aes128_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)_xts_aes128_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_XTS,
.block_size = AES_BLOCK_SIZE,
.key_size = AES256_KEY_SIZE * 2,
.ctx_size = sizeof(struct xts_aes256_key),
.encrypt = _xts_aes256_encrypt,
.decrypt = _xts_aes256_decrypt,
.set_encrypt_key = (nettle_set_key_func*)_xts_aes256_set_encrypt_key,
.set_decrypt_key = (nettle_set_key_func*)_xts_aes256_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_128_SIV,
.block_size = SIV_BLOCK_SIZE,
.key_size = SIV_CMAC_AES128_KEY_SIZE,
.ctx_size = sizeof(struct siv_cmac_aes128_ctx),
.aead_encrypt = (aead_encrypt_func)_siv_cmac_aes128_encrypt_message,
.aead_decrypt = (aead_decrypt_func)_siv_cmac_aes128_decrypt_message,
.set_encrypt_key = (nettle_set_key_func*)siv_cmac_aes128_set_key,
.set_decrypt_key = (nettle_set_key_func*)siv_cmac_aes128_set_key,
.max_iv_size = SIV_DIGEST_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_SIV,
.block_size = SIV_BLOCK_SIZE,
.key_size = SIV_CMAC_AES256_KEY_SIZE,
.ctx_size = sizeof(struct siv_cmac_aes256_ctx),
.aead_encrypt = (aead_encrypt_func)_siv_cmac_aes256_encrypt_message,
.aead_decrypt = (aead_decrypt_func)_siv_cmac_aes256_decrypt_message,
.set_encrypt_key = (nettle_set_key_func*)siv_cmac_aes256_set_key,
.set_decrypt_key = (nettle_set_key_func*)siv_cmac_aes256_set_key,
.max_iv_size = SIV_DIGEST_SIZE,
},
};
static int wrap_nettle_cipher_exists(gnutls_cipher_algorithm_t algo)
{
unsigned i;
for (i=0;i<sizeof(builtin_ciphers)/sizeof(builtin_ciphers[0]);i++) {
if (algo == builtin_ciphers[i].algo) {
return 1;
}
}
return 0;
}
static int
wrap_nettle_cipher_init(gnutls_cipher_algorithm_t algo, void **_ctx,
int enc)
{
struct nettle_cipher_ctx *ctx;
ptrdiff_t cur_alignment;
int idx = -1;
unsigned i;
uint8_t *ctx_ptr;
for (i=0;i<sizeof(builtin_ciphers)/sizeof(builtin_ciphers[0]);i++) {
if (algo == builtin_ciphers[i].algo) {
idx = i;
break;
}
}
if (idx == -1)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
ctx = gnutls_calloc(1, sizeof(*ctx)+builtin_ciphers[idx].ctx_size+16);
if (ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
ctx->enc = enc;
ctx_ptr = ((uint8_t*)ctx) + sizeof(*ctx);
cur_alignment = ((ptrdiff_t)ctx_ptr) % 16;
if (cur_alignment > 0)
ctx_ptr += 16 - cur_alignment;
ctx->ctx_ptr = ctx_ptr;
ctx->cipher = &builtin_ciphers[idx];
*_ctx = ctx;
return 0;
}
static int
wrap_nettle_cipher_setkey(void *_ctx, const void *key, size_t keysize)
{
struct nettle_cipher_ctx *ctx = _ctx;
if (ctx->cipher->key_size > 0 && unlikely(keysize != ctx->cipher->key_size)) {
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
} else if (ctx->cipher->key_size == 0) {
ctx->cipher->gen_set_key(ctx->ctx_ptr, keysize, key);
return 0;
}
if (ctx->enc)
ctx->cipher->set_encrypt_key(ctx->ctx_ptr, key);
else
ctx->cipher->set_decrypt_key(ctx->ctx_ptr, key);
return 0;
}
static int
wrap_nettle_cipher_setiv(void *_ctx, const void *iv, size_t iv_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
unsigned max_iv;
switch (ctx->cipher->algo) {
case GNUTLS_CIPHER_AES_128_GCM:
case GNUTLS_CIPHER_AES_192_GCM:
case GNUTLS_CIPHER_AES_256_GCM:
FIPS_RULE(iv_size < GCM_IV_SIZE, GNUTLS_E_INVALID_REQUEST, "access to short GCM nonce size\n");
break;
case GNUTLS_CIPHER_SALSA20_256:
case GNUTLS_CIPHER_ESTREAM_SALSA20_256:
if (iv_size != SALSA20_IV_SIZE)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
break;
default:
break;
}
max_iv = ctx->cipher->max_iv_size;
if (max_iv == 0)
max_iv = MAX_CIPHER_BLOCK_SIZE;
if (iv_size > max_iv)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
if (ctx->cipher->set_iv) {
ctx->cipher->set_iv(ctx->ctx_ptr, iv_size, iv);
} else {
if (iv)
memcpy(ctx->iv, iv, iv_size);
ctx->iv_size = iv_size;
}
return 0;
}
static int
wrap_nettle_cipher_getiv(void *_ctx, void *iv, size_t iv_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
if (iv_size < ctx->iv_size)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
memcpy(iv, ctx->iv, ctx->iv_size);
return (int) ctx->iv_size;
}
static int
wrap_nettle_cipher_decrypt(void *_ctx, const void *encr, size_t encr_size,
void *plain, size_t plain_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
if (unlikely(ctx->cipher->decrypt == NULL))
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
ctx->cipher->decrypt(ctx, encr_size, plain, encr);
return 0;
}
static int
wrap_nettle_cipher_encrypt(void *_ctx, const void *plain, size_t plain_size,
void *encr, size_t encr_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
if (unlikely(ctx->cipher->encrypt == NULL))
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
ctx->cipher->encrypt(ctx, plain_size, encr, plain);
return 0;
}
static int
wrap_nettle_cipher_aead_encrypt(void *_ctx,
const void *nonce, size_t nonce_size,
const void *auth, size_t auth_size,
size_t tag_size,
const void *plain, size_t plain_size,
void *encr, size_t encr_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
if (ctx->cipher->aead_encrypt == NULL) {
/* proper AEAD cipher */
if (encr_size < plain_size + tag_size)
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
ctx->cipher->set_iv(ctx->ctx_ptr, nonce_size, nonce);
ctx->cipher->auth(ctx->ctx_ptr, auth_size, auth);
ctx->cipher->encrypt(ctx, plain_size, encr, plain);
ctx->cipher->tag(ctx->ctx_ptr, tag_size, ((uint8_t*)encr) + plain_size);
} else {
/* CCM-style cipher */
ctx->cipher->aead_encrypt(ctx,
nonce_size, nonce,
auth_size, auth,
tag_size,
tag_size+plain_size, encr,
plain);
}
return 0;
}
static int
wrap_nettle_cipher_aead_decrypt(void *_ctx,
const void *nonce, size_t nonce_size,
const void *auth, size_t auth_size,
size_t tag_size,
const void *encr, size_t encr_size,
void *plain, size_t plain_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
int ret;
if (unlikely(encr_size < tag_size))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
if (ctx->cipher->aead_decrypt == NULL) {
/* proper AEAD cipher */
uint8_t tag[MAX_HASH_SIZE];
ctx->cipher->set_iv(ctx->ctx_ptr, nonce_size, nonce);
ctx->cipher->auth(ctx->ctx_ptr, auth_size, auth);
encr_size -= tag_size;
ctx->cipher->decrypt(ctx, encr_size, plain, encr);
ctx->cipher->tag(ctx->ctx_ptr, tag_size, tag);
if (gnutls_memcmp(((uint8_t*)encr)+encr_size, tag, tag_size) != 0)
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
} else {
/* CCM-style cipher */
encr_size -= tag_size;
ret = ctx->cipher->aead_decrypt(ctx,
nonce_size, nonce,
auth_size, auth,
tag_size,
encr_size, plain,
encr);
if (unlikely(ret == 0))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
}
return 0;
}
static int
wrap_nettle_cipher_auth(void *_ctx, const void *plain, size_t plain_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
ctx->cipher->auth(ctx->ctx_ptr, plain_size, plain);
return 0;
}
static void wrap_nettle_cipher_tag(void *_ctx, void *tag, size_t tag_size)
{
struct nettle_cipher_ctx *ctx = _ctx;
ctx->cipher->tag(ctx->ctx_ptr, tag_size, tag);
}
static void wrap_nettle_cipher_close(void *_ctx)
{
struct nettle_cipher_ctx *ctx = _ctx;
zeroize_temp_key(ctx->ctx_ptr, ctx->cipher->ctx_size);
gnutls_free(ctx);
}
gnutls_crypto_cipher_st _gnutls_cipher_ops = {
.init = wrap_nettle_cipher_init,
.exists = wrap_nettle_cipher_exists,
.setiv = wrap_nettle_cipher_setiv,
.getiv = wrap_nettle_cipher_getiv,
.setkey = wrap_nettle_cipher_setkey,
.encrypt = wrap_nettle_cipher_encrypt,
.decrypt = wrap_nettle_cipher_decrypt,
.aead_encrypt = wrap_nettle_cipher_aead_encrypt,
.aead_decrypt = wrap_nettle_cipher_aead_decrypt,
.deinit = wrap_nettle_cipher_close,
.auth = wrap_nettle_cipher_auth,
.tag = wrap_nettle_cipher_tag,
};