projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f0be44f4 DM |
1 | /* |
| 2 | * Glue Code for the asm optimized version of the AES Cipher Algorithm | |
| 3 | */ | |
| 4 | ||
| 5 | #include <linux/module.h> | |
| 6 | #include <linux/crypto.h> | |
| 7 | #include <crypto/aes.h> | |
| 8 | ||
| 5ce26f3b | 9 | #include "aes_glue.h" |
| f0be44f4 | 10 | |
| 5ce26f3b AB |
11 | EXPORT_SYMBOL(AES_encrypt); |
| 12 | EXPORT_SYMBOL(AES_decrypt); | |
| 13 | EXPORT_SYMBOL(private_AES_set_encrypt_key); | |
| 14 | EXPORT_SYMBOL(private_AES_set_decrypt_key); | |
| f0be44f4 DM |
15 | |
| 16 | static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
| 17 | { | |
| 18 | struct AES_CTX *ctx = crypto_tfm_ctx(tfm); | |
| 19 | AES_encrypt(src, dst, &ctx->enc_key); | |
| 20 | } | |
| 21 | ||
| 22 | static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) | |
| 23 | { | |
| 24 | struct AES_CTX *ctx = crypto_tfm_ctx(tfm); | |
| 25 | AES_decrypt(src, dst, &ctx->dec_key); | |
| 26 | } | |
| 27 | ||
| 28 | static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
| 29 | unsigned int key_len) | |
| 30 | { | |
| 31 | struct AES_CTX *ctx = crypto_tfm_ctx(tfm); | |
| 32 | ||
| 33 | switch (key_len) { | |
| 34 | case AES_KEYSIZE_128: | |
| 35 | key_len = 128; | |
| 36 | break; | |
| 37 | case AES_KEYSIZE_192: | |
| 38 | key_len = 192; | |
| 39 | break; | |
| 40 | case AES_KEYSIZE_256: | |
| 41 | key_len = 256; | |
| 42 | break; | |
| 43 | default: | |
| 44 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
| 45 | return -EINVAL; | |
| 46 | } | |
| 47 | ||
| 48 | if (private_AES_set_encrypt_key(in_key, key_len, &ctx->enc_key) == -1) { | |
| 49 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
| 50 | return -EINVAL; | |
| 51 | } | |
| 52 | /* private_AES_set_decrypt_key expects an encryption key as input */ | |
| 53 | ctx->dec_key = ctx->enc_key; | |
| 54 | if (private_AES_set_decrypt_key(in_key, key_len, &ctx->dec_key) == -1) { | |
| 55 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
| 56 | return -EINVAL; | |
| 57 | } | |
| 58 | return 0; | |
| 59 | } | |
| 60 | ||
| 61 | static struct crypto_alg aes_alg = { | |
| 62 | .cra_name = "aes", | |
| 63 | .cra_driver_name = "aes-asm", | |
| 64 | .cra_priority = 200, | |
| 65 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, | |
| 66 | .cra_blocksize = AES_BLOCK_SIZE, | |
| 67 | .cra_ctxsize = sizeof(struct AES_CTX), | |
| 68 | .cra_module = THIS_MODULE, | |
| 69 | .cra_list = LIST_HEAD_INIT(aes_alg.cra_list), | |
| 70 | .cra_u = { | |
| 71 | .cipher = { | |
| 72 | .cia_min_keysize = AES_MIN_KEY_SIZE, | |
| 73 | .cia_max_keysize = AES_MAX_KEY_SIZE, | |
| 5ce26f3b | 74 | .cia_setkey = aes_set_key, |
| f0be44f4 DM |
75 | .cia_encrypt = aes_encrypt, |
| 76 | .cia_decrypt = aes_decrypt | |
| 77 | } | |
| 78 | } | |
| 79 | }; | |
| 80 | ||
| 81 | static int __init aes_init(void) | |
| 82 | { | |
| 83 | return crypto_register_alg(&aes_alg); | |
| 84 | } | |
| 85 | ||
| 86 | static void __exit aes_fini(void) | |
| 87 | { | |
| 88 | crypto_unregister_alg(&aes_alg); | |
| 89 | } | |
| 90 | ||
| 91 | module_init(aes_init); | |
| 92 | module_exit(aes_fini); | |
| 93 | ||
| 94 | MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm (ASM)"); | |
| 95 | MODULE_LICENSE("GPL"); | |
| 5d26a105 KC |
96 | MODULE_ALIAS_CRYPTO("aes"); |
| 97 | MODULE_ALIAS_CRYPTO("aes-asm"); | |
| f0be44f4 | 98 | MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>"); |