/*
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* Copyright (c) 2015 South Silicon Valley Microelectronics Inc.
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* Copyright (c) 2015 iComm Corporation
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/crypto.h>
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#include <crypto/aes.h>
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#define AES_MAXNR 14
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typedef struct {
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unsigned int rd_key[4 *(AES_MAXNR + 1)];
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int rounds;
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} AES_KEY;
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struct AES_CTX {
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AES_KEY enc_key;
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AES_KEY dec_key;
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};
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asmlinkage void AES_encrypt(const u8 *in, u8 *out, AES_KEY *ctx);
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asmlinkage void AES_decrypt(const u8 *in, u8 *out, AES_KEY *ctx);
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asmlinkage int private_AES_set_decrypt_key(const unsigned char *userKey, const int bits, AES_KEY *key);
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asmlinkage int private_AES_set_encrypt_key(const unsigned char *userKey, const int bits, AES_KEY *key);
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static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
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AES_encrypt(src, dst, &ctx->enc_key);
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}
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static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
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AES_decrypt(src, dst, &ctx->dec_key);
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}
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static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
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switch (key_len) {
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case AES_KEYSIZE_128:
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key_len = 128;
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break;
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case AES_KEYSIZE_192:
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key_len = 192;
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break;
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case AES_KEYSIZE_256:
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key_len = 256;
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break;
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default:
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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if (private_AES_set_encrypt_key(in_key, key_len, &ctx->enc_key) == -1) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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ctx->dec_key = ctx->enc_key;
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if (private_AES_set_decrypt_key(in_key, key_len, &ctx->dec_key) == -1) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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return 0;
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}
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static struct crypto_alg aes_alg = {
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.cra_name = "aes",
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.cra_driver_name = "aes-asm",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct AES_CTX),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
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.cra_u = {
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.cipher = {
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.cia_min_keysize = AES_MIN_KEY_SIZE,
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.cia_max_keysize = AES_MAX_KEY_SIZE,
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.cia_setkey = aes_set_key,
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.cia_encrypt = aes_encrypt,
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.cia_decrypt = aes_decrypt
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}
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}
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};
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int aes_init(void)
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{
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return crypto_register_alg(&aes_alg);
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}
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void aes_fini(void)
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{
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crypto_unregister_alg(&aes_alg);
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}
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