diff options
Diffstat (limited to 'lib/accelerated/x86/aes-xts-x86-aesni.c')
| -rw-r--r-- | lib/accelerated/x86/aes-xts-x86-aesni.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/lib/accelerated/x86/aes-xts-x86-aesni.c b/lib/accelerated/x86/aes-xts-x86-aesni.c new file mode 100644 index 0000000..0588d0b --- /dev/null +++ b/lib/accelerated/x86/aes-xts-x86-aesni.c @@ -0,0 +1,166 @@ +/* + * Copyright (C) 2011-2012 Free Software Foundation, Inc. + * Copyright (C) 2020 Red Hat, Inc. + * + * Authors: Nikos Mavrogiannopoulos, Anderson Toshiyuki Sasaki + * + * This file is part of GnuTLS. + * + * The GnuTLS 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/> + * + */ + +/* + * The following code wraps the CRYPTOGAMS implementation of the AES-XTS cipher + * using Intel's AES instruction set. + */ + +#include "errors.h" +#include "gnutls_int.h" +#include "fips.h" +#include <gnutls/crypto.h> +#include <aes-x86.h> +#include <x86-common.h> + +struct x86_aes_xts_ctx { + AES_KEY block_key; + AES_KEY tweak_key; + uint8_t iv[16]; + int enc; +}; + +static int +x86_aes_xts_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx, + int enc) +{ + if (algorithm != GNUTLS_CIPHER_AES_128_XTS && + algorithm != GNUTLS_CIPHER_AES_256_XTS) + return GNUTLS_E_INVALID_REQUEST; + + *_ctx = gnutls_calloc(1, sizeof(struct x86_aes_xts_ctx)); + if (*_ctx == NULL) { + gnutls_assert(); + return GNUTLS_E_MEMORY_ERROR; + } + + ((struct x86_aes_xts_ctx *) (*_ctx))->enc = enc; + + return 0; +} + +static int +x86_aes_xts_cipher_setkey(void *_ctx, const void *userkey, size_t keysize) +{ + struct x86_aes_xts_ctx *ctx = _ctx; + int ret; + size_t keybits; + const uint8_t *key = userkey; + + if ((keysize != 32) && (keysize != 64)) + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + + /* Check key block according to FIPS-140-2 IG A.9 */ + if (_gnutls_fips_mode_enabled()){ + if (gnutls_memcmp(key, key + (keysize / 2), keysize / 2) == 0) { + _gnutls_switch_lib_state(LIB_STATE_ERROR); + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + } + } + + /* Size in bits of each half for block and tweak (=keysize * 8 / 2) */ + keybits = keysize * 4; + + if (ctx->enc) + ret = + aesni_set_encrypt_key(key, keybits, + ALIGN16(&ctx->block_key)); + else + ret = + aesni_set_decrypt_key(key, keybits, + ALIGN16(&ctx->block_key)); + + if (ret != 0) + return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED); + + ret = + aesni_set_encrypt_key(key + (keysize / 2), keybits, + ALIGN16(&ctx->tweak_key)); + if (ret != 0) + return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED); + + return 0; +} + +static int x86_aes_xts_setiv(void *_ctx, const void *iv, size_t iv_size) +{ + struct x86_aes_xts_ctx *ctx = _ctx; + + if (iv_size != 16) + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + + memcpy(ctx->iv, iv, 16); + return 0; +} + +static int +x86_aes_xts_encrypt(void *_ctx, const void *src, size_t src_size, + void *dst, size_t dst_size) +{ + struct x86_aes_xts_ctx *ctx = _ctx; + + if (unlikely(dst_size < src_size)) + return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); + + if (src_size < 16) + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + + aesni_xts_encrypt(src, dst, src_size, ALIGN16(&ctx->block_key), + ALIGN16(&ctx->tweak_key), ctx->iv); + return 0; +} + +static int +x86_aes_xts_decrypt(void *_ctx, const void *src, size_t src_size, + void *dst, size_t dst_size) +{ + struct x86_aes_xts_ctx *ctx = _ctx; + + if (unlikely(dst_size < src_size)) + return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); + + if (src_size < 16) + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + + aesni_xts_decrypt(src, dst, src_size, ALIGN16(&ctx->block_key), + ALIGN16(&ctx->tweak_key), ctx->iv); + return 0; +} + +static void x86_aes_xts_deinit(void *_ctx) +{ + struct x86_aes_xts_ctx *ctx = _ctx; + + zeroize_temp_key(ctx, sizeof(*ctx)); + gnutls_free(ctx); +} + +const gnutls_crypto_cipher_st _gnutls_aes_xts_x86_aesni = { + .init = x86_aes_xts_cipher_init, + .setkey = x86_aes_xts_cipher_setkey, + .setiv = x86_aes_xts_setiv, + .encrypt = x86_aes_xts_encrypt, + .decrypt = x86_aes_xts_decrypt, + .deinit = x86_aes_xts_deinit, +}; + |