109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
|
/*
|
||
|
|
* Glue Code for the asm optimized version of the AES Cipher Algorithm
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/crypto.h>
|
||
|
|
#include <crypto/aes.h>
|
||
|
|
|
||
|
|
#define AES_MAXNR 14
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
unsigned int rd_key[4 *(AES_MAXNR + 1)];
|
||
|
|
int rounds;
|
||
|
|
} AES_KEY;
|
||
|
|
|
||
|
|
struct AES_CTX {
|
||
|
|
AES_KEY enc_key;
|
||
|
|
AES_KEY dec_key;
|
||
|
|
};
|
||
|
|
|
||
|
|
asmlinkage void AES_encrypt(const u8 *in, u8 *out, AES_KEY *ctx);
|
||
|
|
asmlinkage void AES_decrypt(const u8 *in, u8 *out, AES_KEY *ctx);
|
||
|
|
asmlinkage int private_AES_set_decrypt_key(const unsigned char *userKey, const int bits, AES_KEY *key);
|
||
|
|
asmlinkage int private_AES_set_encrypt_key(const unsigned char *userKey, const int bits, AES_KEY *key);
|
||
|
|
|
||
|
|
static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
||
|
|
{
|
||
|
|
struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
AES_encrypt(src, dst, &ctx->enc_key);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
||
|
|
{
|
||
|
|
struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
AES_decrypt(src, dst, &ctx->dec_key);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
||
|
|
unsigned int key_len)
|
||
|
|
{
|
||
|
|
struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
switch (key_len) {
|
||
|
|
case AES_KEYSIZE_128:
|
||
|
|
key_len = 128;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_192:
|
||
|
|
key_len = 192;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_256:
|
||
|
|
key_len = 256;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (private_AES_set_encrypt_key(in_key, key_len, &ctx->enc_key) == -1) {
|
||
|
|
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
/* private_AES_set_decrypt_key expects an encryption key as input */
|
||
|
|
ctx->dec_key = ctx->enc_key;
|
||
|
|
if (private_AES_set_decrypt_key(in_key, key_len, &ctx->dec_key) == -1) {
|
||
|
|
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct crypto_alg aes_alg = {
|
||
|
|
.cra_name = "aes",
|
||
|
|
.cra_driver_name = "aes-asm",
|
||
|
|
.cra_priority = 200,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct AES_CTX),
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
|
||
|
|
.cra_u = {
|
||
|
|
.cipher = {
|
||
|
|
.cia_min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.cia_max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.cia_setkey = aes_set_key,
|
||
|
|
.cia_encrypt = aes_encrypt,
|
||
|
|
.cia_decrypt = aes_decrypt
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init aes_init(void)
|
||
|
|
{
|
||
|
|
return crypto_register_alg(&aes_alg);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit aes_fini(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_alg(&aes_alg);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(aes_init);
|
||
|
|
module_exit(aes_fini);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm (ASM)");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_ALIAS("aes");
|
||
|
|
MODULE_ALIAS("aes-asm");
|
||
|
|
MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>");
|