To reduce the number of copies of boilerplate code throughout the tree, this patch implements generic glue for the SHA-1 algorithm. This allows a specific arch or hardware implementation to only implement the special handling that it needs. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> --- crypto/Kconfig | 3 ++ crypto/Makefile | 1 + crypto/sha1_base.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/crypto/sha.h | 17 +++++++ 4 files changed, 146 insertions(+) create mode 100644 crypto/sha1_base.c diff --git a/crypto/Kconfig b/crypto/Kconfig index 1664bd68b97d..155cc15c2719 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -516,6 +516,9 @@ config CRYPTO_RMD320 Developed by Hans Dobbertin, Antoon Bosselaers and Bart Preneel. See <http://homes.esat.kuleuven.be/~bosselae/ripemd160.html> +config CRYPTO_SHA1_BASE + tristate + config CRYPTO_SHA1 tristate "SHA1 digest algorithm" select CRYPTO_HASH diff --git a/crypto/Makefile b/crypto/Makefile index bb9bafeb3ac7..42446cab15f3 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_CRYPTO_RMD128) += rmd128.o obj-$(CONFIG_CRYPTO_RMD160) += rmd160.o obj-$(CONFIG_CRYPTO_RMD256) += rmd256.o obj-$(CONFIG_CRYPTO_RMD320) += rmd320.o +obj-$(CONFIG_CRYPTO_SHA1_BASE) += sha1_base.o obj-$(CONFIG_CRYPTO_SHA1) += sha1_generic.o obj-$(CONFIG_CRYPTO_SHA256_BASE) += sha256_base.o obj-$(CONFIG_CRYPTO_SHA256) += sha256_generic.o diff --git a/crypto/sha1_base.c b/crypto/sha1_base.c new file mode 100644 index 000000000000..30fb0f9b47cf --- /dev/null +++ b/crypto/sha1_base.c @@ -0,0 +1,125 @@ +/* + * sha1_base.c - core logic for SHA-1 implementations + * + * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@xxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <crypto/internal/hash.h> +#include <crypto/sha.h> +#include <linux/crypto.h> +#include <linux/module.h> + +#include <asm/unaligned.h> + +int crypto_sha1_base_init(struct shash_desc *desc) +{ + static const u32 sha1_init_state[] = { + SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4, + }; + struct sha1_state *sctx = shash_desc_ctx(desc); + + memcpy(sctx->state, sha1_init_state, sizeof(sctx->state)); + sctx->count = 0; + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_init); + +int crypto_sha1_base_export(struct shash_desc *desc, void *out) +{ + struct sha1_state *sctx = shash_desc_ctx(desc); + struct sha1_state *dst = out; + + *dst = *sctx; + + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_export); + +int crypto_sha1_base_import(struct shash_desc *desc, const void *in) +{ + struct sha1_state *sctx = shash_desc_ctx(desc); + struct sha1_state const *src = in; + + *sctx = *src; + + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_import); + +int crypto_sha1_base_do_update(struct shash_desc *desc, const u8 *data, + unsigned int len, sha1_block_fn *block_fn, + void *p) +{ + struct sha1_state *sctx = shash_desc_ctx(desc); + unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; + + sctx->count += len; + + if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) { + int blocks; + + if (partial) { + int p = SHA1_BLOCK_SIZE - partial; + + memcpy(sctx->buffer + partial, data, p); + data += p; + len -= p; + } + + blocks = len / SHA1_BLOCK_SIZE; + len %= SHA1_BLOCK_SIZE; + + block_fn(blocks, data, sctx->state, + partial ? sctx->buffer : NULL, p); + data += blocks * SHA1_BLOCK_SIZE; + partial = 0; + } + if (len) + memcpy(sctx->buffer + partial, data, len); + + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_do_update); + +int crypto_sha1_base_do_finalize(struct shash_desc *desc, + sha1_block_fn *block_fn, void *p) +{ + const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64); + struct sha1_state *sctx = shash_desc_ctx(desc); + __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); + unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; + + sctx->buffer[partial++] = 0x80; + if (partial > bit_offset) { + memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial); + partial = 0; + + block_fn(1, sctx->buffer, sctx->state, NULL, p); + } + + memset(sctx->buffer + partial, 0x0, bit_offset - partial); + *bits = cpu_to_be64(sctx->count << 3); + block_fn(1, sctx->buffer, sctx->state, NULL, p); + + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_do_finalize); + +int crypto_sha1_base_finish(struct shash_desc *desc, u8 *out) +{ + unsigned int digest_size = crypto_shash_digestsize(desc->tfm); + struct sha1_state *sctx = shash_desc_ctx(desc); + __be32 *digest = (__be32 *)out; + int i; + + for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32)) + put_unaligned_be32(sctx->state[i], digest++); + + *sctx = (struct sha1_state){}; + return 0; +} +EXPORT_SYMBOL(crypto_sha1_base_finish); diff --git a/include/crypto/sha.h b/include/crypto/sha.h index 0ed6630d7c40..63cba0bbf3bc 100644 --- a/include/crypto/sha.h +++ b/include/crypto/sha.h @@ -82,6 +82,8 @@ struct sha512_state { u8 buf[SHA512_BLOCK_SIZE]; }; +typedef void (sha1_block_fn)(int blocks, u8 const *src, u32 *state, + const u8 *head, void *p); typedef void (sha256_block_fn)(int blocks, u8 const *src, u32 *state, const u8 *head, void *p); typedef void (sha512_block_fn)(int blocks, u8 const *src, u64 *state, @@ -129,4 +131,19 @@ extern int crypto_sha256_base_do_finalize(struct shash_desc *desc, extern int crypto_sha256_base_finish(struct shash_desc *desc, u8 *out); +extern int crypto_sha1_base_init(struct shash_desc *desc); +extern int crypto_sha1_base_init(struct shash_desc *desc); + +extern int crypto_sha1_base_export(struct shash_desc *desc, void *out); +extern int crypto_sha1_base_import(struct shash_desc *desc, const void *in); + +extern int crypto_sha1_base_do_update(struct shash_desc *desc, const u8 *data, + unsigned int len, sha1_block_fn *block_fn, + void *p); + +extern int crypto_sha1_base_do_finalize(struct shash_desc *desc, + sha1_block_fn *block_fn, void *p); + +extern int crypto_sha1_base_finish(struct shash_desc *desc, u8 *out); + #endif -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
