From b59e2ae3690c8ef5f8ddeeb0b6b3313521b915e6 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 9 Apr 2015 12:55:42 +0200 Subject: [PATCH] crypto: arm/sha256 - move SHA-224/256 ASM/NEON implementation to base layer This removes all the boilerplate from the existing implementation, and replaces it with calls into the base layer. Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- arch/arm/crypto/sha256_glue.c | 170 +++++------------------------ arch/arm/crypto/sha256_glue.h | 17 +-- arch/arm/crypto/sha256_neon_glue.c | 143 ++++++------------------ 3 files changed, 66 insertions(+), 264 deletions(-) diff --git a/arch/arm/crypto/sha256_glue.c b/arch/arm/crypto/sha256_glue.c index ccef5e25bbcb..a84e869ef900 100644 --- a/arch/arm/crypto/sha256_glue.c +++ b/arch/arm/crypto/sha256_glue.c @@ -24,165 +24,49 @@ #include #include #include -#include +#include #include #include + #include "sha256_glue.h" asmlinkage void sha256_block_data_order(u32 *digest, const void *data, - unsigned int num_blks); - - -int sha256_init(struct shash_desc *desc) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - - sctx->state[0] = SHA256_H0; - sctx->state[1] = SHA256_H1; - sctx->state[2] = SHA256_H2; - sctx->state[3] = SHA256_H3; - sctx->state[4] = SHA256_H4; - sctx->state[5] = SHA256_H5; - sctx->state[6] = SHA256_H6; - sctx->state[7] = SHA256_H7; - sctx->count = 0; - - return 0; -} - -int sha224_init(struct shash_desc *desc) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - - sctx->state[0] = SHA224_H0; - sctx->state[1] = SHA224_H1; - sctx->state[2] = SHA224_H2; - sctx->state[3] = SHA224_H3; - sctx->state[4] = SHA224_H4; - sctx->state[5] = SHA224_H5; - sctx->state[6] = SHA224_H6; - sctx->state[7] = SHA224_H7; - sctx->count = 0; - - return 0; -} - -int __sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len, - unsigned int partial) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int done = 0; + unsigned int num_blks); - sctx->count += len; - - if (partial) { - done = SHA256_BLOCK_SIZE - partial; - memcpy(sctx->buf + partial, data, done); - sha256_block_data_order(sctx->state, sctx->buf, 1); - } - - if (len - done >= SHA256_BLOCK_SIZE) { - const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE; - - sha256_block_data_order(sctx->state, data + done, rounds); - done += rounds * SHA256_BLOCK_SIZE; - } - - memcpy(sctx->buf, data + done, len - done); - - return 0; -} - -int sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len) +int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data, + unsigned int len) { - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; - - /* Handle the fast case right here */ - if (partial + len < SHA256_BLOCK_SIZE) { - sctx->count += len; - memcpy(sctx->buf + partial, data, len); + /* make sure casting to sha256_block_fn() is safe */ + BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0); - return 0; - } - - return __sha256_update(desc, data, len, partial); + return sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); } +EXPORT_SYMBOL(crypto_sha256_arm_update); -/* Add padding and return the message digest. */ static int sha256_final(struct shash_desc *desc, u8 *out) { - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int i, index, padlen; - __be32 *dst = (__be32 *)out; - __be64 bits; - static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, }; - - /* save number of bits */ - bits = cpu_to_be64(sctx->count << 3); - - /* Pad out to 56 mod 64 and append length */ - index = sctx->count % SHA256_BLOCK_SIZE; - padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index); - - /* We need to fill a whole block for __sha256_update */ - if (padlen <= 56) { - sctx->count += padlen; - memcpy(sctx->buf + index, padding, padlen); - } else { - __sha256_update(desc, padding, padlen, index); - } - __sha256_update(desc, (const u8 *)&bits, sizeof(bits), 56); - - /* Store state in digest */ - for (i = 0; i < 8; i++) - dst[i] = cpu_to_be32(sctx->state[i]); - - /* Wipe context */ - memset(sctx, 0, sizeof(*sctx)); - - return 0; -} - -static int sha224_final(struct shash_desc *desc, u8 *out) -{ - u8 D[SHA256_DIGEST_SIZE]; - - sha256_final(desc, D); - - memcpy(out, D, SHA224_DIGEST_SIZE); - memzero_explicit(D, SHA256_DIGEST_SIZE); - - return 0; -} - -int sha256_export(struct shash_desc *desc, void *out) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - - memcpy(out, sctx, sizeof(*sctx)); - - return 0; + sha256_base_do_finalize(desc, + (sha256_block_fn *)sha256_block_data_order); + return sha256_base_finish(desc, out); } -int sha256_import(struct shash_desc *desc, const void *in) +int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) { - struct sha256_state *sctx = shash_desc_ctx(desc); - - memcpy(sctx, in, sizeof(*sctx)); - - return 0; + sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); + return sha256_final(desc, out); } +EXPORT_SYMBOL(crypto_sha256_arm_finup); static struct shash_alg algs[] = { { .digestsize = SHA256_DIGEST_SIZE, - .init = sha256_init, - .update = sha256_update, + .init = sha256_base_init, + .update = crypto_sha256_arm_update, .final = sha256_final, - .export = sha256_export, - .import = sha256_import, + .finup = crypto_sha256_arm_finup, .descsize = sizeof(struct sha256_state), - .statesize = sizeof(struct sha256_state), .base = { .cra_name = "sha256", .cra_driver_name = "sha256-asm", @@ -193,13 +77,11 @@ static struct shash_alg algs[] = { { } }, { .digestsize = SHA224_DIGEST_SIZE, - .init = sha224_init, - .update = sha256_update, - .final = sha224_final, - .export = sha256_export, - .import = sha256_import, + .init = sha224_base_init, + .update = crypto_sha256_arm_update, + .final = sha256_final, + .finup = crypto_sha256_arm_finup, .descsize = sizeof(struct sha256_state), - .statesize = sizeof(struct sha256_state), .base = { .cra_name = "sha224", .cra_driver_name = "sha224-asm", diff --git a/arch/arm/crypto/sha256_glue.h b/arch/arm/crypto/sha256_glue.h index 0312f4ffe8cc..7cf0bf786ada 100644 --- a/arch/arm/crypto/sha256_glue.h +++ b/arch/arm/crypto/sha256_glue.h @@ -2,22 +2,13 @@ #define _CRYPTO_SHA256_GLUE_H #include -#include extern struct shash_alg sha256_neon_algs[2]; -extern int sha256_init(struct shash_desc *desc); +int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data, + unsigned int len); -extern int sha224_init(struct shash_desc *desc); - -extern int __sha256_update(struct shash_desc *desc, const u8 *data, - unsigned int len, unsigned int partial); - -extern int sha256_update(struct shash_desc *desc, const u8 *data, - unsigned int len); - -extern int sha256_export(struct shash_desc *desc, void *out); - -extern int sha256_import(struct shash_desc *desc, const void *in); +int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *hash); #endif /* _CRYPTO_SHA256_GLUE_H */ diff --git a/arch/arm/crypto/sha256_neon_glue.c b/arch/arm/crypto/sha256_neon_glue.c index c4da10090eee..39ccd658817e 100644 --- a/arch/arm/crypto/sha256_neon_glue.c +++ b/arch/arm/crypto/sha256_neon_glue.c @@ -19,131 +19,62 @@ #include #include #include +#include #include #include #include + #include "sha256_glue.h" asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data, - unsigned int num_blks); - + unsigned int num_blks); -static int __sha256_neon_update(struct shash_desc *desc, const u8 *data, - unsigned int len, unsigned int partial) +static int sha256_update(struct shash_desc *desc, const u8 *data, + unsigned int len) { struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int done = 0; - - sctx->count += len; - - if (partial) { - done = SHA256_BLOCK_SIZE - partial; - memcpy(sctx->buf + partial, data, done); - sha256_block_data_order_neon(sctx->state, sctx->buf, 1); - } - - if (len - done >= SHA256_BLOCK_SIZE) { - const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE; - sha256_block_data_order_neon(sctx->state, data + done, rounds); - done += rounds * SHA256_BLOCK_SIZE; - } + if (!may_use_simd() || + (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) + return crypto_sha256_arm_update(desc, data, len); - memcpy(sctx->buf, data + done, len - done); + kernel_neon_begin(); + sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order_neon); + kernel_neon_end(); return 0; } -static int sha256_neon_update(struct shash_desc *desc, const u8 *data, - unsigned int len) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; - int res; - - /* Handle the fast case right here */ - if (partial + len < SHA256_BLOCK_SIZE) { - sctx->count += len; - memcpy(sctx->buf + partial, data, len); - - return 0; - } - - if (!may_use_simd()) { - res = __sha256_update(desc, data, len, partial); - } else { - kernel_neon_begin(); - res = __sha256_neon_update(desc, data, len, partial); - kernel_neon_end(); - } - - return res; -} - -/* Add padding and return the message digest. */ -static int sha256_neon_final(struct shash_desc *desc, u8 *out) +static int sha256_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) { - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int i, index, padlen; - __be32 *dst = (__be32 *)out; - __be64 bits; - static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, }; - - /* save number of bits */ - bits = cpu_to_be64(sctx->count << 3); - - /* Pad out to 56 mod 64 and append length */ - index = sctx->count % SHA256_BLOCK_SIZE; - padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index); - - if (!may_use_simd()) { - sha256_update(desc, padding, padlen); - sha256_update(desc, (const u8 *)&bits, sizeof(bits)); - } else { - kernel_neon_begin(); - /* We need to fill a whole block for __sha256_neon_update() */ - if (padlen <= 56) { - sctx->count += padlen; - memcpy(sctx->buf + index, padding, padlen); - } else { - __sha256_neon_update(desc, padding, padlen, index); - } - __sha256_neon_update(desc, (const u8 *)&bits, - sizeof(bits), 56); - kernel_neon_end(); - } - - /* Store state in digest */ - for (i = 0; i < 8; i++) - dst[i] = cpu_to_be32(sctx->state[i]); - - /* Wipe context */ - memzero_explicit(sctx, sizeof(*sctx)); - - return 0; + if (!may_use_simd()) + return crypto_sha256_arm_finup(desc, data, len, out); + + kernel_neon_begin(); + if (len) + sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order_neon); + sha256_base_do_finalize(desc, + (sha256_block_fn *)sha256_block_data_order_neon); + kernel_neon_end(); + + return sha256_base_finish(desc, out); } -static int sha224_neon_final(struct shash_desc *desc, u8 *out) +static int sha256_final(struct shash_desc *desc, u8 *out) { - u8 D[SHA256_DIGEST_SIZE]; - - sha256_neon_final(desc, D); - - memcpy(out, D, SHA224_DIGEST_SIZE); - memzero_explicit(D, SHA256_DIGEST_SIZE); - - return 0; + return sha256_finup(desc, NULL, 0, out); } struct shash_alg sha256_neon_algs[] = { { .digestsize = SHA256_DIGEST_SIZE, - .init = sha256_init, - .update = sha256_neon_update, - .final = sha256_neon_final, - .export = sha256_export, - .import = sha256_import, + .init = sha256_base_init, + .update = sha256_update, + .final = sha256_final, + .finup = sha256_finup, .descsize = sizeof(struct sha256_state), - .statesize = sizeof(struct sha256_state), .base = { .cra_name = "sha256", .cra_driver_name = "sha256-neon", @@ -154,13 +85,11 @@ struct shash_alg sha256_neon_algs[] = { { } }, { .digestsize = SHA224_DIGEST_SIZE, - .init = sha224_init, - .update = sha256_neon_update, - .final = sha224_neon_final, - .export = sha256_export, - .import = sha256_import, + .init = sha224_base_init, + .update = sha256_update, + .final = sha256_final, + .finup = sha256_finup, .descsize = sizeof(struct sha256_state), - .statesize = sizeof(struct sha256_state), .base = { .cra_name = "sha224", .cra_driver_name = "sha224-neon", -- 2.20.1