From 2e9440ae6eab492572463d8cb266381264867723 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Tue, 5 Jan 2021 17:47:55 +0100 Subject: [PATCH] crypto: x86/serpent - drop CTR mode implementation Serpent in CTR mode is never used by the kernel directly, and is highly unlikely to be relied upon by dm-crypt or algif_skcipher. So let's drop the accelerated CTR mode implementation, and instead, rely on the CTR template and the bare cipher. Acked-by: Eric Biggers Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- arch/x86/crypto/serpent-avx-x86_64-asm_64.S | 20 ------ arch/x86/crypto/serpent-avx2-asm_64.S | 25 -------- arch/x86/crypto/serpent_avx2_glue.c | 38 ------------ arch/x86/crypto/serpent_avx_glue.c | 51 ---------------- arch/x86/crypto/serpent_sse2_glue.c | 67 --------------------- crypto/Kconfig | 3 + 6 files changed, 3 insertions(+), 201 deletions(-) diff --git a/arch/x86/crypto/serpent-avx-x86_64-asm_64.S b/arch/x86/crypto/serpent-avx-x86_64-asm_64.S index 6b41f46bcc76..b7ee24df7fba 100644 --- a/arch/x86/crypto/serpent-avx-x86_64-asm_64.S +++ b/arch/x86/crypto/serpent-avx-x86_64-asm_64.S @@ -711,23 +711,3 @@ SYM_FUNC_START(serpent_cbc_dec_8way_avx) FRAME_END ret; SYM_FUNC_END(serpent_cbc_dec_8way_avx) - -SYM_FUNC_START(serpent_ctr_8way_avx) - /* input: - * %rdi: ctx, CTX - * %rsi: dst - * %rdx: src - * %rcx: iv (little endian, 128bit) - */ - FRAME_BEGIN - - load_ctr_8way(%rcx, .Lbswap128_mask, RA1, RB1, RC1, RD1, RA2, RB2, RC2, - RD2, RK0, RK1, RK2); - - call __serpent_enc_blk8_avx; - - store_ctr_8way(%rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2); - - FRAME_END - ret; -SYM_FUNC_END(serpent_ctr_8way_avx) diff --git a/arch/x86/crypto/serpent-avx2-asm_64.S b/arch/x86/crypto/serpent-avx2-asm_64.S index a510a949f02f..9161b6e441f3 100644 --- a/arch/x86/crypto/serpent-avx2-asm_64.S +++ b/arch/x86/crypto/serpent-avx2-asm_64.S @@ -724,28 +724,3 @@ SYM_FUNC_START(serpent_cbc_dec_16way) FRAME_END ret; SYM_FUNC_END(serpent_cbc_dec_16way) - -SYM_FUNC_START(serpent_ctr_16way) - /* input: - * %rdi: ctx, CTX - * %rsi: dst (16 blocks) - * %rdx: src (16 blocks) - * %rcx: iv (little endian, 128bit) - */ - FRAME_BEGIN - - vzeroupper; - - load_ctr_16way(%rcx, .Lbswap128_mask, RA1, RB1, RC1, RD1, RA2, RB2, RC2, - RD2, RK0, RK0x, RK1, RK1x, RK2, RK2x, RK3, RK3x, RNOT, - tp); - - call __serpent_enc_blk16; - - store_ctr_16way(%rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2); - - vzeroupper; - - FRAME_END - ret; -SYM_FUNC_END(serpent_ctr_16way) diff --git a/arch/x86/crypto/serpent_avx2_glue.c b/arch/x86/crypto/serpent_avx2_glue.c index 9cdf2c078e21..28e542c6512a 100644 --- a/arch/x86/crypto/serpent_avx2_glue.c +++ b/arch/x86/crypto/serpent_avx2_glue.c @@ -22,8 +22,6 @@ asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src); asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src); asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src); -asmlinkage void serpent_ctr_16way(const void *ctx, u8 *dst, const u8 *src, - le128 *iv); static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { @@ -46,22 +44,6 @@ static const struct common_glue_ctx serpent_enc = { } } }; -static const struct common_glue_ctx serpent_ctr = { - .num_funcs = 3, - .fpu_blocks_limit = 8, - - .funcs = { { - .num_blocks = 16, - .fn_u = { .ctr = serpent_ctr_16way } - }, { - .num_blocks = 8, - .fn_u = { .ctr = serpent_ctr_8way_avx } - }, { - .num_blocks = 1, - .fn_u = { .ctr = __serpent_crypt_ctr } - } } -}; - static const struct common_glue_ctx serpent_dec = { .num_funcs = 3, .fpu_blocks_limit = 8, @@ -114,11 +96,6 @@ static int cbc_decrypt(struct skcipher_request *req) return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); } -static int ctr_crypt(struct skcipher_request *req) -{ - return glue_ctr_req_128bit(&serpent_ctr, req); -} - static struct skcipher_alg serpent_algs[] = { { .base.cra_name = "__ecb(serpent)", @@ -147,21 +124,6 @@ static struct skcipher_alg serpent_algs[] = { .setkey = serpent_setkey_skcipher, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, - }, { - .base.cra_name = "__ctr(serpent)", - .base.cra_driver_name = "__ctr-serpent-avx2", - .base.cra_priority = 600, - .base.cra_flags = CRYPTO_ALG_INTERNAL, - .base.cra_blocksize = 1, - .base.cra_ctxsize = sizeof(struct serpent_ctx), - .base.cra_module = THIS_MODULE, - .min_keysize = SERPENT_MIN_KEY_SIZE, - .max_keysize = SERPENT_MAX_KEY_SIZE, - .ivsize = SERPENT_BLOCK_SIZE, - .chunksize = SERPENT_BLOCK_SIZE, - .setkey = serpent_setkey_skcipher, - .encrypt = ctr_crypt, - .decrypt = ctr_crypt, }, }; diff --git a/arch/x86/crypto/serpent_avx_glue.c b/arch/x86/crypto/serpent_avx_glue.c index b17a08b57a91..aa4605baf9d4 100644 --- a/arch/x86/crypto/serpent_avx_glue.c +++ b/arch/x86/crypto/serpent_avx_glue.c @@ -31,24 +31,6 @@ asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst, const u8 *src); EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx); -asmlinkage void serpent_ctr_8way_avx(const void *ctx, u8 *dst, const u8 *src, - le128 *iv); -EXPORT_SYMBOL_GPL(serpent_ctr_8way_avx); - -void __serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv) -{ - be128 ctrblk; - u128 *dst = (u128 *)d; - const u128 *src = (const u128 *)s; - - le128_to_be128(&ctrblk, iv); - le128_inc(iv); - - __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk); - u128_xor(dst, src, (u128 *)&ctrblk); -} -EXPORT_SYMBOL_GPL(__serpent_crypt_ctr); - static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { @@ -68,19 +50,6 @@ static const struct common_glue_ctx serpent_enc = { } } }; -static const struct common_glue_ctx serpent_ctr = { - .num_funcs = 2, - .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, - - .funcs = { { - .num_blocks = SERPENT_PARALLEL_BLOCKS, - .fn_u = { .ctr = serpent_ctr_8way_avx } - }, { - .num_blocks = 1, - .fn_u = { .ctr = __serpent_crypt_ctr } - } } -}; - static const struct common_glue_ctx serpent_dec = { .num_funcs = 2, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, @@ -127,11 +96,6 @@ static int cbc_decrypt(struct skcipher_request *req) return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); } -static int ctr_crypt(struct skcipher_request *req) -{ - return glue_ctr_req_128bit(&serpent_ctr, req); -} - static struct skcipher_alg serpent_algs[] = { { .base.cra_name = "__ecb(serpent)", @@ -160,21 +124,6 @@ static struct skcipher_alg serpent_algs[] = { .setkey = serpent_setkey_skcipher, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, - }, { - .base.cra_name = "__ctr(serpent)", - .base.cra_driver_name = "__ctr-serpent-avx", - .base.cra_priority = 500, - .base.cra_flags = CRYPTO_ALG_INTERNAL, - .base.cra_blocksize = 1, - .base.cra_ctxsize = sizeof(struct serpent_ctx), - .base.cra_module = THIS_MODULE, - .min_keysize = SERPENT_MIN_KEY_SIZE, - .max_keysize = SERPENT_MAX_KEY_SIZE, - .ivsize = SERPENT_BLOCK_SIZE, - .chunksize = SERPENT_BLOCK_SIZE, - .setkey = serpent_setkey_skcipher, - .encrypt = ctr_crypt, - .decrypt = ctr_crypt, }, }; diff --git a/arch/x86/crypto/serpent_sse2_glue.c b/arch/x86/crypto/serpent_sse2_glue.c index 4fed8d26b91a..9acb3bf28feb 100644 --- a/arch/x86/crypto/serpent_sse2_glue.c +++ b/arch/x86/crypto/serpent_sse2_glue.c @@ -10,8 +10,6 @@ * * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: * Copyright (c) 2006 Herbert Xu - * CTR part based on code (crypto/ctr.c) by: - * (C) Copyright IBM Corp. 2007 - Joy Latten */ #include @@ -47,38 +45,6 @@ static void serpent_decrypt_cbc_xway(const void *ctx, u8 *d, const u8 *s) u128_xor(dst + (j + 1), dst + (j + 1), ivs + j); } -static void serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv) -{ - be128 ctrblk; - u128 *dst = (u128 *)d; - const u128 *src = (const u128 *)s; - - le128_to_be128(&ctrblk, iv); - le128_inc(iv); - - __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk); - u128_xor(dst, src, (u128 *)&ctrblk); -} - -static void serpent_crypt_ctr_xway(const void *ctx, u8 *d, const u8 *s, - le128 *iv) -{ - be128 ctrblks[SERPENT_PARALLEL_BLOCKS]; - u128 *dst = (u128 *)d; - const u128 *src = (const u128 *)s; - unsigned int i; - - for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) { - if (dst != src) - dst[i] = src[i]; - - le128_to_be128(&ctrblks[i], iv); - le128_inc(iv); - } - - serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks); -} - static const struct common_glue_ctx serpent_enc = { .num_funcs = 2, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, @@ -92,19 +58,6 @@ static const struct common_glue_ctx serpent_enc = { } } }; -static const struct common_glue_ctx serpent_ctr = { - .num_funcs = 2, - .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, - - .funcs = { { - .num_blocks = SERPENT_PARALLEL_BLOCKS, - .fn_u = { .ctr = serpent_crypt_ctr_xway } - }, { - .num_blocks = 1, - .fn_u = { .ctr = serpent_crypt_ctr } - } } -}; - static const struct common_glue_ctx serpent_dec = { .num_funcs = 2, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, @@ -152,11 +105,6 @@ static int cbc_decrypt(struct skcipher_request *req) return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); } -static int ctr_crypt(struct skcipher_request *req) -{ - return glue_ctr_req_128bit(&serpent_ctr, req); -} - static struct skcipher_alg serpent_algs[] = { { .base.cra_name = "__ecb(serpent)", @@ -185,21 +133,6 @@ static struct skcipher_alg serpent_algs[] = { .setkey = serpent_setkey_skcipher, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, - }, { - .base.cra_name = "__ctr(serpent)", - .base.cra_driver_name = "__ctr-serpent-sse2", - .base.cra_priority = 400, - .base.cra_flags = CRYPTO_ALG_INTERNAL, - .base.cra_blocksize = 1, - .base.cra_ctxsize = sizeof(struct serpent_ctx), - .base.cra_module = THIS_MODULE, - .min_keysize = SERPENT_MIN_KEY_SIZE, - .max_keysize = SERPENT_MAX_KEY_SIZE, - .ivsize = SERPENT_BLOCK_SIZE, - .chunksize = SERPENT_BLOCK_SIZE, - .setkey = serpent_setkey_skcipher, - .encrypt = ctr_crypt, - .decrypt = ctr_crypt, }, }; diff --git a/crypto/Kconfig b/crypto/Kconfig index ea788cab8c7d..dd48c3bab3f5 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -1539,6 +1539,7 @@ config CRYPTO_SERPENT_SSE2_X86_64 select CRYPTO_GLUE_HELPER_X86 select CRYPTO_SERPENT select CRYPTO_SIMD + imply CRYPTO_CTR help Serpent cipher algorithm, by Anderson, Biham & Knudsen. @@ -1558,6 +1559,7 @@ config CRYPTO_SERPENT_SSE2_586 select CRYPTO_GLUE_HELPER_X86 select CRYPTO_SERPENT select CRYPTO_SIMD + imply CRYPTO_CTR help Serpent cipher algorithm, by Anderson, Biham & Knudsen. @@ -1578,6 +1580,7 @@ config CRYPTO_SERPENT_AVX_X86_64 select CRYPTO_SERPENT select CRYPTO_SIMD imply CRYPTO_XTS + imply CRYPTO_CTR help Serpent cipher algorithm, by Anderson, Biham & Knudsen.