diff options
Diffstat (limited to 'lib/accelerated/x86/aes-padlock.c')
| -rw-r--r-- | lib/accelerated/x86/aes-padlock.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/lib/accelerated/x86/aes-padlock.c b/lib/accelerated/x86/aes-padlock.c new file mode 100644 index 0000000..4fa6389 --- /dev/null +++ b/lib/accelerated/x86/aes-padlock.c @@ -0,0 +1,184 @@ +/* + * Copyright (C) 2011-2018 Free Software Foundation, Inc. + * Copyright (C) 2018 Red Hat, Inc. + * + * Author: Nikos Mavrogiannopoulos + * + * 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 is an implementation of the AES-128-CBC cipher + * using VIA Padlock instruction set. + */ + +#include "errors.h" +#include "gnutls_int.h" +#include <gnutls/crypto.h> +#include "errors.h" +#include <aes-x86.h> +#include <x86-common.h> +#include <nettle/aes.h> /* for key generation in 192 and 256 bits */ +#include <sha-padlock.h> +#include <aes-padlock.h> + +static int +aes_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx, int enc) +{ + /* we use key size to distinguish */ + if (algorithm != GNUTLS_CIPHER_AES_128_CBC + && algorithm != GNUTLS_CIPHER_AES_256_CBC + && algorithm != GNUTLS_CIPHER_AES_192_CBC) + return GNUTLS_E_INVALID_REQUEST; + + *_ctx = gnutls_calloc(1, sizeof(struct padlock_ctx)); + if (*_ctx == NULL) { + gnutls_assert(); + return GNUTLS_E_MEMORY_ERROR; + } + + ((struct padlock_ctx *) (*_ctx))->enc = enc; + return 0; +} + +int +padlock_aes_cipher_setkey(void *_ctx, const void *userkey, size_t keysize) +{ + struct padlock_ctx *ctx = _ctx; + struct padlock_cipher_data *pce; + struct aes192_ctx nc192; + struct aes256_ctx nc256; + + memset(_ctx, 0, sizeof(struct padlock_cipher_data)); + + pce = ALIGN16(&ctx->expanded_key); + + pce->cword.b.encdec = (ctx->enc == 0); + + switch (keysize) { + case 16: + pce->cword.b.ksize = 0; + pce->cword.b.rounds = 10; + memcpy(pce->ks.rd_key, userkey, 16); + pce->cword.b.keygen = 0; + break; + case 24: + pce->cword.b.ksize = 1; + pce->cword.b.rounds = 12; + if (ctx->enc) + aes192_set_encrypt_key(&nc192, userkey); + else + aes192_set_decrypt_key(&nc192, userkey); + memcpy(pce->ks.rd_key, nc192.keys, sizeof(nc192.keys)); + pce->ks.rounds = _AES192_ROUNDS; + pce->cword.b.keygen = 1; + break; + case 32: + pce->cword.b.ksize = 2; + pce->cword.b.rounds = 14; + + /* expand key using nettle */ + if (ctx->enc) + aes256_set_encrypt_key(&nc256, userkey); + else + aes256_set_decrypt_key(&nc256, userkey); + + memcpy(pce->ks.rd_key, nc256.keys, sizeof(nc256.keys)); + pce->ks.rounds = _AES256_ROUNDS; + + pce->cword.b.keygen = 1; + break; + default: + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + } + + padlock_reload_key(); + + return 0; +} + +static int aes_setiv(void *_ctx, const void *iv, size_t iv_size) +{ + struct padlock_ctx *ctx = _ctx; + struct padlock_cipher_data *pce; + + pce = ALIGN16(&ctx->expanded_key); + + if (iv_size != 16) + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + + memcpy(pce->iv, iv, 16); + + return 0; +} + +static int +padlock_aes_cbc_encrypt(void *_ctx, const void *src, size_t src_size, + void *dst, size_t dst_size) +{ + struct padlock_ctx *ctx = _ctx; + struct padlock_cipher_data *pce; + int ret = 1; + + if (unlikely(dst_size < src_size)) + return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); + + pce = ALIGN16(&ctx->expanded_key); + + if (src_size > 0) + ret = padlock_cbc_encrypt(dst, src, pce, src_size); + + return ret ? 0 : GNUTLS_E_ENCRYPTION_FAILED; +} + + +static int +padlock_aes_cbc_decrypt(void *_ctx, const void *src, size_t src_size, + void *dst, size_t dst_size) +{ + struct padlock_ctx *ctx = _ctx; + struct padlock_cipher_data *pcd; + int ret = 1; + + if (unlikely(dst_size < src_size)) + return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); + + pcd = ALIGN16(&ctx->expanded_key); + + if (src_size > 0) + padlock_cbc_encrypt(dst, src, pcd, src_size); + + return ret ? 0 : GNUTLS_E_ENCRYPTION_FAILED; +} + +static void aes_deinit(void *_ctx) +{ + struct padlock_ctx *ctx = _ctx; + + zeroize_temp_key(ctx, sizeof(*ctx)); + gnutls_free(ctx); +} + +const gnutls_crypto_cipher_st _gnutls_aes_padlock = { + .init = aes_cipher_init, + .setkey = padlock_aes_cipher_setkey, + .setiv = aes_setiv, + .encrypt = padlock_aes_cbc_encrypt, + .decrypt = padlock_aes_cbc_decrypt, + .deinit = aes_deinit, +}; + |