arm/crypto: Add optimized AES and SHA1 routines

Add assembler versions of AES and SHA1 for ARM platforms.  This has provided
up to a 50% improvement in IPsec/TCP throughout for tunnels using AES128/SHA1.

Platform   CPU SPeed    Endian   Before (bps)   After (bps)   Improvement

IXP425      533 MHz      big     11217042        15566294        ~38%
KS8695      166 MHz     little    3828549         5795373        ~51%

Signed-off-by: David McCullough <ucdevel@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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>");