crypto: x86/twofish-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-twofish-avx algorithm which did this.  Users who request
lrw(twofish) and previously would have gotten lrw-twofish-avx will now
get lrw(ecb-twofish-avx) instead, which is just as fast.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/twofish_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/twofish.h>
@@ -227,144 +226,6 @@ static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	return glue_ctr_crypt_128bit(&twofish_ctr, desc, dst, src, nbytes);
 }
 
-static inline bool twofish_fpu_begin(bool fpu_enabled, unsigned int nbytes)
-{
-	return glue_fpu_begin(TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS, NULL,
-			      fpu_enabled, nbytes);
-}
-
-static inline void twofish_fpu_end(bool fpu_enabled)
-{
-	glue_fpu_end(fpu_enabled);
-}
-
-struct crypt_priv {
-	struct twofish_ctx *ctx;
-	bool fpu_enabled;
-};
-
-static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = TF_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
-		twofish_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
-		return;
-	}
-
-	for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
-		twofish_enc_blk_3way(ctx->ctx, srcdst, srcdst);
-
-	nbytes %= bsize * 3;
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		twofish_enc_blk(ctx->ctx, srcdst, srcdst);
-}
-
-static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = TF_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
-		twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
-		return;
-	}
-
-	for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
-		twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);
-
-	nbytes %= bsize * 3;
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		twofish_dec_blk(ctx->ctx, srcdst, srcdst);
-}
-
-struct twofish_lrw_ctx {
-	struct lrw_table_ctx lrw_table;
-	struct twofish_ctx twofish_ctx;
-};
-
-static int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
-			      unsigned int keylen)
-{
-	struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
-	int err;
-
-	err = __twofish_setkey(&ctx->twofish_ctx, key, keylen - TF_BLOCK_SIZE,
-			       &tfm->crt_flags);
-	if (err)
-		return err;
-
-	return lrw_init_table(&ctx->lrw_table, key + keylen - TF_BLOCK_SIZE);
-}
-
-static void lrw_twofish_exit_tfm(struct crypto_tfm *tfm)
-{
-	struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	lrw_free_table(&ctx->lrw_table);
-}
-
-static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		       struct scatterlist *src, unsigned int nbytes)
-{
-	struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[TWOFISH_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->twofish_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);
-	twofish_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 twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[TWOFISH_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->twofish_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);
-	twofish_fpu_end(crypt_ctx.fpu_enabled);
-
-	return ret;
-}
-
 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
@@ -385,7 +246,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
 }
 
-static struct crypto_alg twofish_algs[10] = { {
+static struct crypto_alg twofish_algs[] = { {
 	.cra_name		= "__ecb-twofish-avx",
 	.cra_driver_name	= "__driver-ecb-twofish-avx",
 	.cra_priority		= 0,
@@ -446,30 +307,6 @@ static struct crypto_alg twofish_algs[10] = { {
 			.decrypt	= ctr_crypt,
 		},
 	},
-}, {
-	.cra_name		= "__lrw-twofish-avx",
-	.cra_driver_name	= "__driver-lrw-twofish-avx",
-	.cra_priority		= 0,
-	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
-				  CRYPTO_ALG_INTERNAL,
-	.cra_blocksize		= TF_BLOCK_SIZE,
-	.cra_ctxsize		= sizeof(struct twofish_lrw_ctx),
-	.cra_alignmask		= 0,
-	.cra_type		= &crypto_blkcipher_type,
-	.cra_module		= THIS_MODULE,
-	.cra_exit		= lrw_twofish_exit_tfm,
-	.cra_u = {
-		.blkcipher = {
-			.min_keysize	= TF_MIN_KEY_SIZE +
-					  TF_BLOCK_SIZE,
-			.max_keysize	= TF_MAX_KEY_SIZE +
-					  TF_BLOCK_SIZE,
-			.ivsize		= TF_BLOCK_SIZE,
-			.setkey		= lrw_twofish_setkey,
-			.encrypt	= lrw_encrypt,
-			.decrypt	= lrw_decrypt,
-		},
-	},
 }, {
 	.cra_name		= "__xts-twofish-avx",
 	.cra_driver_name	= "__driver-xts-twofish-avx",
@@ -557,30 +394,6 @@ static struct crypto_alg twofish_algs[10] = { {
 			.geniv		= "chainiv",
 		},
 	},
-}, {
-	.cra_name		= "lrw(twofish)",
-	.cra_driver_name	= "lrw-twofish-avx",
-	.cra_priority		= 400,
-	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
-	.cra_blocksize		= TF_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	= TF_MIN_KEY_SIZE +
-					  TF_BLOCK_SIZE,
-			.max_keysize	= TF_MAX_KEY_SIZE +
-					  TF_BLOCK_SIZE,
-			.ivsize		= TF_BLOCK_SIZE,
-			.setkey		= ablk_set_key,
-			.encrypt	= ablk_encrypt,
-			.decrypt	= ablk_decrypt,
-		},
-	},
 }, {
 	.cra_name		= "xts(twofish)",
 	.cra_driver_name	= "xts-twofish-avx",

crypto/Kconfig

@@ -1608,7 +1608,6 @@ config CRYPTO_TWOFISH_AVX_X86_64
 	select CRYPTO_TWOFISH_COMMON
 	select CRYPTO_TWOFISH_X86_64
 	select CRYPTO_TWOFISH_X86_64_3WAY
-	select CRYPTO_LRW
 	select CRYPTO_XTS
 	help
 	  Twofish cipher algorithm (x86_64/AVX).