linux-stable/arch/arm/crypto/aes_glue.c
Ard Biesheuvel 5ce26f3b5a ARM: move AES typedefs and function prototypes to separate header
Put the struct definitions for AES keys and the asm function prototypes in a
separate header and export the asm functions from the module.
This allows other drivers to use them directly.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2013-10-04 09:26:54 +02:00

98 lines
2.3 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>
#include "aes_glue.h"
EXPORT_SYMBOL(AES_encrypt);
EXPORT_SYMBOL(AES_decrypt);
EXPORT_SYMBOL(private_AES_set_encrypt_key);
EXPORT_SYMBOL(private_AES_set_decrypt_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>");