From 68bfc4924b536ed052198121aef01c525ff6831d Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Mon, 19 Feb 2018 23:48:07 -0800 Subject: [PATCH] crypto: x86/twofish-3way - 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-3way algorithm which did this. Users who request lrw(twofish) and previously would have gotten lrw-twofish-3way will now get lrw(ecb-twofish-3way) instead, which is just as fast. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- arch/x86/crypto/twofish_avx_glue.c | 26 +++++++++ arch/x86/crypto/twofish_glue_3way.c | 81 +-------------------------- arch/x86/include/asm/crypto/twofish.h | 11 ---- crypto/Kconfig | 1 - 4 files changed, 27 insertions(+), 92 deletions(-) diff --git a/arch/x86/crypto/twofish_avx_glue.c b/arch/x86/crypto/twofish_avx_glue.c index b7a3904b953c..3358e23f9ffb 100644 --- a/arch/x86/crypto/twofish_avx_glue.c +++ b/arch/x86/crypto/twofish_avx_glue.c @@ -262,6 +262,32 @@ static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) 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) { diff --git a/arch/x86/crypto/twofish_glue_3way.c b/arch/x86/crypto/twofish_glue_3way.c index 243e90a4b5d9..2d6dc5d7f0aa 100644 --- a/arch/x86/crypto/twofish_glue_3way.c +++ b/arch/x86/crypto/twofish_glue_3way.c @@ -30,7 +30,6 @@ #include #include #include -#include #include EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way); @@ -213,63 +212,6 @@ static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) twofish_dec_blk(ctx, srcdst, srcdst); } -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); -} -EXPORT_SYMBOL_GPL(lrw_twofish_setkey); - -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[3]; - struct lrw_crypt_req req = { - .tbuf = buf, - .tbuflen = sizeof(buf), - - .table_ctx = &ctx->lrw_table, - .crypt_ctx = &ctx->twofish_ctx, - .crypt_fn = encrypt_callback, - }; - - return lrw_crypt(desc, dst, src, nbytes, &req); -} - -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[3]; - struct lrw_crypt_req req = { - .tbuf = buf, - .tbuflen = sizeof(buf), - - .table_ctx = &ctx->lrw_table, - .crypt_ctx = &ctx->twofish_ctx, - .crypt_fn = decrypt_callback, - }; - - return lrw_crypt(desc, dst, src, nbytes, &req); -} - -void lrw_twofish_exit_tfm(struct crypto_tfm *tfm) -{ - struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm); - - lrw_free_table(&ctx->lrw_table); -} -EXPORT_SYMBOL_GPL(lrw_twofish_exit_tfm); - int xts_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { @@ -328,7 +270,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, return xts_crypt(desc, dst, src, nbytes, &req); } -static struct crypto_alg tf_algs[5] = { { +static struct crypto_alg tf_algs[] = { { .cra_name = "ecb(twofish)", .cra_driver_name = "ecb-twofish-3way", .cra_priority = 300, @@ -387,27 +329,6 @@ static struct crypto_alg tf_algs[5] = { { .decrypt = ctr_crypt, }, }, -}, { - .cra_name = "lrw(twofish)", - .cra_driver_name = "lrw-twofish-3way", - .cra_priority = 300, - .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, - .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)", .cra_driver_name = "xts-twofish-3way", diff --git a/arch/x86/include/asm/crypto/twofish.h b/arch/x86/include/asm/crypto/twofish.h index 65bb80adba3e..3c904116ee00 100644 --- a/arch/x86/include/asm/crypto/twofish.h +++ b/arch/x86/include/asm/crypto/twofish.h @@ -4,14 +4,8 @@ #include #include -#include #include -struct twofish_lrw_ctx { - struct lrw_table_ctx lrw_table; - struct twofish_ctx twofish_ctx; -}; - struct twofish_xts_ctx { struct twofish_ctx tweak_ctx; struct twofish_ctx crypt_ctx; @@ -36,11 +30,6 @@ extern void twofish_enc_blk_ctr(void *ctx, u128 *dst, const u128 *src, extern void twofish_enc_blk_ctr_3way(void *ctx, u128 *dst, const u128 *src, le128 *iv); -extern int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, - unsigned int keylen); - -extern void lrw_twofish_exit_tfm(struct crypto_tfm *tfm); - extern int xts_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen); diff --git a/crypto/Kconfig b/crypto/Kconfig index cca8271d8894..eba78fa85147 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -1584,7 +1584,6 @@ config CRYPTO_TWOFISH_X86_64_3WAY select CRYPTO_TWOFISH_COMMON select CRYPTO_TWOFISH_X86_64 select CRYPTO_GLUE_HELPER_X86 - select CRYPTO_LRW select CRYPTO_XTS help Twofish cipher algorithm (x86_64, 3-way parallel).