crypto: x86/serpent-avx - remove LRW algorithm

The LRW template now wraps an ECB mode algorithm rather than the block
cipher directly.  Therefore it is now redundant for crypto modules to
wrap their ECB code with generic LRW code themselves via lrw_crypt().

Remove the lrw-serpent-avx algorithm which did this.  Users who request
lrw(serpent) and previously would have gotten lrw-serpent-avx will now
get lrw(ecb-serpent-avx) instead, which is just as fast.
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/serpent_avx_glue.c

@@ -34,7 +34,6 @@
 #include <crypto/cryptd.h>
 #include <crypto/b128ops.h>
 #include <crypto/ctr.h>
-#include <crypto/lrw.h>
 #include <crypto/xts.h>
 #include <asm/fpu/api.h>
 #include <asm/crypto/serpent-avx.h>
@@ -202,132 +201,6 @@ static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 }
 
-static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
-{
-	return glue_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
-			      NULL, fpu_enabled, nbytes);
-}
-
-static inline void serpent_fpu_end(bool fpu_enabled)
-{
-	glue_fpu_end(fpu_enabled);
-}
-
-struct crypt_priv {
-	struct serpent_ctx *ctx;
-	bool fpu_enabled;
-};
-
-static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = SERPENT_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
-		serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
-		return;
-	}
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		__serpent_encrypt(ctx->ctx, srcdst, srcdst);
-}
-
-static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = SERPENT_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
-		serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
-		return;
-	}
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		__serpent_decrypt(ctx->ctx, srcdst, srcdst);
-}
-
-int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
-		       unsigned int keylen)
-{
-	struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
-	int err;
-
-	err = __serpent_setkey(&ctx->serpent_ctx, key, keylen -
-							SERPENT_BLOCK_SIZE);
-	if (err)
-		return err;
-
-	return lrw_init_table(&ctx->lrw_table, key + keylen -
-						SERPENT_BLOCK_SIZE);
-}
-EXPORT_SYMBOL_GPL(lrw_serpent_setkey);
-
-static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		       struct scatterlist *src, unsigned int nbytes)
-{
-	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[SERPENT_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->serpent_ctx,
-		.fpu_enabled = false,
-	};
-	struct lrw_crypt_req req = {
-		.tbuf = buf,
-		.tbuflen = sizeof(buf),
-
-		.table_ctx = &ctx->lrw_table,
-		.crypt_ctx = &crypt_ctx,
-		.crypt_fn = encrypt_callback,
-	};
-	int ret;
-
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-	ret = lrw_crypt(desc, dst, src, nbytes, &req);
-	serpent_fpu_end(crypt_ctx.fpu_enabled);
-
-	return ret;
-}
-
-static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		       struct scatterlist *src, unsigned int nbytes)
-{
-	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[SERPENT_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->serpent_ctx,
-		.fpu_enabled = false,
-	};
-	struct lrw_crypt_req req = {
-		.tbuf = buf,
-		.tbuflen = sizeof(buf),
-
-		.table_ctx = &ctx->lrw_table,
-		.crypt_ctx = &crypt_ctx,
-		.crypt_fn = decrypt_callback,
-	};
-	int ret;
-
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-	ret = lrw_crypt(desc, dst, src, nbytes, &req);
-	serpent_fpu_end(crypt_ctx.fpu_enabled);
-
-	return ret;
-}
-
-void lrw_serpent_exit_tfm(struct crypto_tfm *tfm)
-{
-	struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	lrw_free_table(&ctx->lrw_table);
-}
-EXPORT_SYMBOL_GPL(lrw_serpent_exit_tfm);
-
 int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 		       unsigned int keylen)
 {
@@ -368,7 +241,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
 }
 
-static struct crypto_alg serpent_algs[10] = { {
+static struct crypto_alg serpent_algs[] = { {
 	.cra_name		= "__ecb-serpent-avx",
 	.cra_driver_name	= "__driver-ecb-serpent-avx",
 	.cra_priority		= 0,
@@ -429,30 +302,6 @@ static struct crypto_alg serpent_algs[10] = { {
 			.decrypt	= ctr_crypt,
 		},
 	},
-}, {
-	.cra_name		= "__lrw-serpent-avx",
-	.cra_driver_name	= "__driver-lrw-serpent-avx",
-	.cra_priority		= 0,
-	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
-				  CRYPTO_ALG_INTERNAL,
-	.cra_blocksize		= SERPENT_BLOCK_SIZE,
-	.cra_ctxsize		= sizeof(struct serpent_lrw_ctx),
-	.cra_alignmask		= 0,
-	.cra_type		= &crypto_blkcipher_type,
-	.cra_module		= THIS_MODULE,
-	.cra_exit		= lrw_serpent_exit_tfm,
-	.cra_u = {
-		.blkcipher = {
-			.min_keysize	= SERPENT_MIN_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.max_keysize	= SERPENT_MAX_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.ivsize		= SERPENT_BLOCK_SIZE,
-			.setkey		= lrw_serpent_setkey,
-			.encrypt	= lrw_encrypt,
-			.decrypt	= lrw_decrypt,
-		},
-	},
 }, {
 	.cra_name		= "__xts-serpent-avx",
 	.cra_driver_name	= "__driver-xts-serpent-avx",
@@ -540,30 +389,6 @@ static struct crypto_alg serpent_algs[10] = { {
 			.geniv		= "chainiv",
 		},
 	},
-}, {
-	.cra_name		= "lrw(serpent)",
-	.cra_driver_name	= "lrw-serpent-avx",
-	.cra_priority		= 500,
-	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
-	.cra_blocksize		= SERPENT_BLOCK_SIZE,
-	.cra_ctxsize		= sizeof(struct async_helper_ctx),
-	.cra_alignmask		= 0,
-	.cra_type		= &crypto_ablkcipher_type,
-	.cra_module		= THIS_MODULE,
-	.cra_init		= ablk_init,
-	.cra_exit		= ablk_exit,
-	.cra_u = {
-		.ablkcipher = {
-			.min_keysize	= SERPENT_MIN_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.max_keysize	= SERPENT_MAX_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.ivsize		= SERPENT_BLOCK_SIZE,
-			.setkey		= ablk_set_key,
-			.encrypt	= ablk_encrypt,
-			.decrypt	= ablk_decrypt,
-		},
-	},
 }, {
 	.cra_name		= "xts(serpent)",
 	.cra_driver_name	= "xts-serpent-avx",

arch/x86/include/asm/crypto/serpent-avx.h

@@ -7,11 +7,6 @@
 
 #define SERPENT_PARALLEL_BLOCKS 8
 
-struct serpent_lrw_ctx {
-	struct lrw_table_ctx lrw_table;
-	struct serpent_ctx serpent_ctx;
-};
-
 struct serpent_xts_ctx {
 	struct serpent_ctx tweak_ctx;
 	struct serpent_ctx crypt_ctx;
@@ -38,11 +33,6 @@ extern void __serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src,
 extern void serpent_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv);
 extern void serpent_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv);
 
-extern int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
-			      unsigned int keylen);
-
-extern void lrw_serpent_exit_tfm(struct crypto_tfm *tfm);
-
 extern int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 			      unsigned int keylen);
 

crypto/Kconfig

@@ -1465,7 +1465,6 @@ config CRYPTO_SERPENT_AVX_X86_64
 	select CRYPTO_ABLK_HELPER
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SERPENT
-	select CRYPTO_LRW
 	select CRYPTO_XTS
 	help
 	  Serpent cipher algorithm, by Anderson, Biham & Knudsen.