1 files changed, 57 insertions, 96 deletions

diff --git a/arch/arm/crypto/aes-neonbs-glue.c b/arch/arm/crypto/aes-neonbs-glue.c
index e85839a8aaeb..f6be80b5938b 100644
--- a/arch/arm/crypto/aes-neonbs-glue.c
+++ b/arch/arm/crypto/aes-neonbs-glue.c
@@ -8,15 +8,16 @@
 #include <asm/neon.h>
 #include <asm/simd.h>
 #include <crypto/aes.h>
-#include <crypto/cbc.h>
 #include <crypto/ctr.h>
 #include <crypto/internal/simd.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
 #include <crypto/xts.h>
 #include <linux/module.h>
+#include "aes-cipher.h"
 
 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_DESCRIPTION("Bit sliced AES using NEON instructions");
 MODULE_LICENSE("GPL v2");
 
 MODULE_ALIAS_CRYPTO("ecb(aes)");
@@ -35,7 +36,7 @@ asmlinkage void aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
 				  int rounds, int blocks, u8 iv[]);
 
 asmlinkage void aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
-				  int rounds, int blocks, u8 ctr[], u8 final[]);
+				  int rounds, int blocks, u8 ctr[]);
 
 asmlinkage void aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[],
 				  int rounds, int blocks, u8 iv[], int);
@@ -49,13 +50,13 @@ struct aesbs_ctx {
 
 struct aesbs_cbc_ctx {
 	struct aesbs_ctx	key;
-	struct crypto_cipher	*enc_tfm;
+	struct crypto_aes_ctx	fallback;
 };
 
 struct aesbs_xts_ctx {
 	struct aesbs_ctx	key;
-	struct crypto_cipher	*cts_tfm;
-	struct crypto_cipher	*tweak_tfm;
+	struct crypto_aes_ctx	fallback;
+	struct crypto_aes_ctx	tweak_key;
 };
 
 struct aesbs_ctr_ctx {
@@ -126,32 +127,49 @@ static int aesbs_cbc_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
 			    unsigned int key_len)
 {
 	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
-	struct crypto_aes_ctx rk;
 	int err;
 
-	err = aes_expandkey(&rk, in_key, key_len);
+	err = aes_expandkey(&ctx->fallback, in_key, key_len);
 	if (err)
 		return err;
 
 	ctx->key.rounds = 6 + key_len / 4;
 
 	kernel_neon_begin();
-	aesbs_convert_key(ctx->key.rk, rk.key_enc, ctx->key.rounds);
+	aesbs_convert_key(ctx->key.rk, ctx->fallback.key_enc, ctx->key.rounds);
 	kernel_neon_end();
 
-	return crypto_cipher_setkey(ctx->enc_tfm, in_key, key_len);
+	return 0;
 }
 
-static void cbc_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
+static int cbc_encrypt(struct skcipher_request *req)
 {
-	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	const struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
 
-	crypto_cipher_encrypt_one(ctx->enc_tfm, dst, src);
-}
+	err = skcipher_walk_virt(&walk, req, false);
 
-static int cbc_encrypt(struct skcipher_request *req)
-{
-	return crypto_cbc_encrypt_walk(req, cbc_encrypt_one);
+	while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
+		const u8 *src = walk.src.virt.addr;
+		u8 *dst = walk.dst.virt.addr;
+		u8 *prev = walk.iv;
+
+		do {
+			crypto_xor_cpy(dst, src, prev, AES_BLOCK_SIZE);
+			__aes_arm_encrypt(ctx->fallback.key_enc,
+					  ctx->key.rounds, dst, dst);
+			prev = dst;
+			src += AES_BLOCK_SIZE;
+			dst += AES_BLOCK_SIZE;
+			nbytes -= AES_BLOCK_SIZE;
+		} while (nbytes >= AES_BLOCK_SIZE);
+		memcpy(walk.iv, prev, AES_BLOCK_SIZE);
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+	return err;
 }
 
 static int cbc_decrypt(struct skcipher_request *req)
@@ -182,22 +200,6 @@ static int cbc_decrypt(struct skcipher_request *req)
 	return err;
 }
 
-static int cbc_init(struct crypto_tfm *tfm)
-{
-	struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	ctx->enc_tfm = crypto_alloc_cipher("aes", 0, 0);
-
-	return PTR_ERR_OR_ZERO(ctx->enc_tfm);
-}
-
-static void cbc_exit(struct crypto_tfm *tfm)
-{
-	struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	crypto_free_cipher(ctx->enc_tfm);
-}
-
 static int aesbs_ctr_setkey_sync(struct crypto_skcipher *tfm, const u8 *in_key,
 				 unsigned int key_len)
 {
@@ -228,32 +230,25 @@ static int ctr_encrypt(struct skcipher_request *req)
 	err = skcipher_walk_virt(&walk, req, false);
 
 	while (walk.nbytes > 0) {
-		unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
-		u8 *final = (walk.total % AES_BLOCK_SIZE) ? buf : NULL;
+		const u8 *src = walk.src.virt.addr;
+		u8 *dst = walk.dst.virt.addr;
+		int bytes = walk.nbytes;
 
-		if (walk.nbytes < walk.total) {
-			blocks = round_down(blocks,
-					    walk.stride / AES_BLOCK_SIZE);
-			final = NULL;
-		}
+		if (unlikely(bytes < AES_BLOCK_SIZE))
+			src = dst = memcpy(buf + sizeof(buf) - bytes,
+					   src, bytes);
+		else if (walk.nbytes < walk.total)
+			bytes &= ~(8 * AES_BLOCK_SIZE - 1);
 
 		kernel_neon_begin();
-		aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
-				  ctx->rk, ctx->rounds, blocks, walk.iv, final);
+		aesbs_ctr_encrypt(dst, src, ctx->rk, ctx->rounds, bytes, walk.iv);
 		kernel_neon_end();
 
-		if (final) {
-			u8 *dst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
-			u8 *src = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
-
-			crypto_xor_cpy(dst, src, final,
-				       walk.total % AES_BLOCK_SIZE);
+		if (unlikely(bytes < AES_BLOCK_SIZE))
+			memcpy(walk.dst.virt.addr,
+			       buf + sizeof(buf) - bytes, bytes);
 
-			err = skcipher_walk_done(&walk, 0);
-			break;
-		}
-		err = skcipher_walk_done(&walk,
-					 walk.nbytes - blocks * AES_BLOCK_SIZE);
+		err = skcipher_walk_done(&walk, walk.nbytes - bytes);
 	}
 
 	return err;
@@ -262,16 +257,8 @@ static int ctr_encrypt(struct skcipher_request *req)
 static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
 {
 	struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
-	unsigned long flags;
-
-	/*
-	 * Temporarily disable interrupts to avoid races where
-	 * cachelines are evicted when the CPU is interrupted
-	 * to do something else.
-	 */
-	local_irq_save(flags);
-	aes_encrypt(&ctx->fallback, dst, src);
-	local_irq_restore(flags);
+
+	__aes_arm_encrypt(ctx->fallback.key_enc, ctx->key.rounds, src, dst);
 }
 
 static int ctr_encrypt_sync(struct skcipher_request *req)
@@ -293,45 +280,23 @@ static int aesbs_xts_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
 		return err;
 
 	key_len /= 2;
-	err = crypto_cipher_setkey(ctx->cts_tfm, in_key, key_len);
+	err = aes_expandkey(&ctx->fallback, in_key, key_len);
 	if (err)
 		return err;
-	err = crypto_cipher_setkey(ctx->tweak_tfm, in_key + key_len, key_len);
+	err = aes_expandkey(&ctx->tweak_key, in_key + key_len, key_len);
 	if (err)
 		return err;
 
 	return aesbs_setkey(tfm, in_key, key_len);
 }
 
-static int xts_init(struct crypto_tfm *tfm)
-{
-	struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	ctx->cts_tfm = crypto_alloc_cipher("aes", 0, 0);
-	if (IS_ERR(ctx->cts_tfm))
-		return PTR_ERR(ctx->cts_tfm);
-
-	ctx->tweak_tfm = crypto_alloc_cipher("aes", 0, 0);
-	if (IS_ERR(ctx->tweak_tfm))
-		crypto_free_cipher(ctx->cts_tfm);
-
-	return PTR_ERR_OR_ZERO(ctx->tweak_tfm);
-}
-
-static void xts_exit(struct crypto_tfm *tfm)
-{
-	struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	crypto_free_cipher(ctx->tweak_tfm);
-	crypto_free_cipher(ctx->cts_tfm);
-}
-
 static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 		       void (*fn)(u8 out[], u8 const in[], u8 const rk[],
 				  int rounds, int blocks, u8 iv[], int))
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+	const int rounds = ctx->key.rounds;
 	int tail = req->cryptlen % AES_BLOCK_SIZE;
 	struct skcipher_request subreq;
 	u8 buf[2 * AES_BLOCK_SIZE];
@@ -355,7 +320,7 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 	if (err)
 		return err;
 
-	crypto_cipher_encrypt_one(ctx->tweak_tfm, walk.iv, walk.iv);
+	__aes_arm_encrypt(ctx->tweak_key.key_enc, rounds, walk.iv, walk.iv);
 
 	while (walk.nbytes >= AES_BLOCK_SIZE) {
 		unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
@@ -369,7 +334,7 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 
 		kernel_neon_begin();
 		fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk,
-		   ctx->key.rounds, blocks, walk.iv, reorder_last_tweak);
+		   rounds, blocks, walk.iv, reorder_last_tweak);
 		kernel_neon_end();
 		err = skcipher_walk_done(&walk,
 					 walk.nbytes - blocks * AES_BLOCK_SIZE);
@@ -387,9 +352,9 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 	crypto_xor(buf, req->iv, AES_BLOCK_SIZE);
 
 	if (encrypt)
-		crypto_cipher_encrypt_one(ctx->cts_tfm, buf, buf);
+		__aes_arm_encrypt(ctx->fallback.key_enc, rounds, buf, buf);
 	else
-		crypto_cipher_decrypt_one(ctx->cts_tfm, buf, buf);
+		__aes_arm_decrypt(ctx->fallback.key_dec, rounds, buf, buf);
 
 	crypto_xor(buf, req->iv, AES_BLOCK_SIZE);
 
@@ -431,8 +396,6 @@ static struct skcipher_alg aes_algs[] = { {
 	.base.cra_ctxsize	= sizeof(struct aesbs_cbc_ctx),
 	.base.cra_module	= THIS_MODULE,
 	.base.cra_flags		= CRYPTO_ALG_INTERNAL,
-	.base.cra_init		= cbc_init,
-	.base.cra_exit		= cbc_exit,
 
 	.min_keysize		= AES_MIN_KEY_SIZE,
 	.max_keysize		= AES_MAX_KEY_SIZE,
@@ -482,8 +445,6 @@ static struct skcipher_alg aes_algs[] = { {
 	.base.cra_ctxsize	= sizeof(struct aesbs_xts_ctx),
 	.base.cra_module	= THIS_MODULE,
 	.base.cra_flags		= CRYPTO_ALG_INTERNAL,
-	.base.cra_init		= xts_init,
-	.base.cra_exit		= xts_exit,
 
 	.min_keysize		= 2 * AES_MIN_KEY_SIZE,
 	.max_keysize		= 2 * AES_MAX_KEY_SIZE,
@@ -530,7 +491,7 @@ static int __init aes_init(void)
 		algname = aes_algs[i].base.cra_name + 2;
 		drvname = aes_algs[i].base.cra_driver_name + 2;
 		basename = aes_algs[i].base.cra_driver_name;
-		simd = simd_skcipher_create_compat(algname, drvname, basename);
+		simd = simd_skcipher_create_compat(aes_algs + i, algname, drvname, basename);
 		err = PTR_ERR(simd);
 		if (IS_ERR(simd))
 			goto unregister_simds;