aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/crypto/aes_glue.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/crypto/aes_glue.c')
-rw-r--r--arch/arm/crypto/aes_glue.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/arm/crypto/aes_glue.c b/arch/arm/crypto/aes_glue.c
new file mode 100644
index 00000000000..59f7877ead6
--- /dev/null
+++ b/arch/arm/crypto/aes_glue.c
@@ -0,0 +1,108 @@
+/*
+ * 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>");