From 07eb54d306f4f0efabe0a0d5dd6739d079d90e0e Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 9 Apr 2015 12:55:44 +0200 Subject: [PATCH] crypto: arm64/sha1-ce - move SHA-1 ARMv8 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/arm64/crypto/sha1-ce-core.S | 33 +++---- arch/arm64/crypto/sha1-ce-glue.c | 161 ++++++++++--------------------- 2 files changed, 64 insertions(+), 130 deletions(-) diff --git a/arch/arm64/crypto/sha1-ce-core.S b/arch/arm64/crypto/sha1-ce-core.S index 09d57d98609c..033aae6d732a 100644 --- a/arch/arm64/crypto/sha1-ce-core.S +++ b/arch/arm64/crypto/sha1-ce-core.S @@ -66,8 +66,8 @@ .word 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 /* - * void sha1_ce_transform(int blocks, u8 const *src, u32 *state, - * u8 *head, long bytes) + * void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, + * int blocks) */ ENTRY(sha1_ce_transform) /* load round constants */ @@ -78,25 +78,22 @@ ENTRY(sha1_ce_transform) ld1r {k3.4s}, [x6] /* load state */ - ldr dga, [x2] - ldr dgb, [x2, #16] + ldr dga, [x0] + ldr dgb, [x0, #16] - /* load partial state (if supplied) */ - cbz x3, 0f - ld1 {v8.4s-v11.4s}, [x3] - b 1f + /* load sha1_ce_state::finalize */ + ldr w4, [x0, #:lo12:sha1_ce_offsetof_finalize] /* load input */ 0: ld1 {v8.4s-v11.4s}, [x1], #64 - sub w0, w0, #1 + sub w2, w2, #1 -1: CPU_LE( rev32 v8.16b, v8.16b ) CPU_LE( rev32 v9.16b, v9.16b ) CPU_LE( rev32 v10.16b, v10.16b ) CPU_LE( rev32 v11.16b, v11.16b ) -2: add t0.4s, v8.4s, k0.4s +1: add t0.4s, v8.4s, k0.4s mov dg0v.16b, dgav.16b add_update c, ev, k0, 8, 9, 10, 11, dgb @@ -127,15 +124,15 @@ CPU_LE( rev32 v11.16b, v11.16b ) add dgbv.2s, dgbv.2s, dg1v.2s add dgav.4s, dgav.4s, dg0v.4s - cbnz w0, 0b + cbnz w2, 0b /* * Final block: add padding and total bit count. - * Skip if we have no total byte count in x4. In that case, the input - * size was not a round multiple of the block size, and the padding is - * handled by the C code. + * Skip if the input size was not a round multiple of the block size, + * the padding is handled by the C code in that case. */ cbz x4, 3f + ldr x4, [x0, #:lo12:sha1_ce_offsetof_count] movi v9.2d, #0 mov x8, #0x80000000 movi v10.2d, #0 @@ -144,10 +141,10 @@ CPU_LE( rev32 v11.16b, v11.16b ) mov x4, #0 mov v11.d[0], xzr mov v11.d[1], x7 - b 2b + b 1b /* store new state */ -3: str dga, [x2] - str dgb, [x2, #16] +3: str dga, [x0] + str dgb, [x0, #16] ret ENDPROC(sha1_ce_transform) diff --git a/arch/arm64/crypto/sha1-ce-glue.c b/arch/arm64/crypto/sha1-ce-glue.c index 6fe83f37a750..114e7cc5de8c 100644 --- a/arch/arm64/crypto/sha1-ce-glue.c +++ b/arch/arm64/crypto/sha1-ce-glue.c @@ -12,144 +12,81 @@ #include #include #include +#include #include #include #include +#define ASM_EXPORT(sym, val) \ + asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val)); + MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); MODULE_AUTHOR("Ard Biesheuvel "); MODULE_LICENSE("GPL v2"); -asmlinkage void sha1_ce_transform(int blocks, u8 const *src, u32 *state, - u8 *head, long bytes); +struct sha1_ce_state { + struct sha1_state sst; + u32 finalize; +}; -static int sha1_init(struct shash_desc *desc) +asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, + int blocks); + +static int sha1_ce_update(struct shash_desc *desc, const u8 *data, + unsigned int len) { - struct sha1_state *sctx = shash_desc_ctx(desc); - - *sctx = (struct sha1_state){ - .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, - }; - return 0; -} - -static int sha1_update(struct shash_desc *desc, const u8 *data, - unsigned int len) -{ - struct sha1_state *sctx = shash_desc_ctx(desc); - unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; - - sctx->count += len; - - if ((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; - - kernel_neon_begin_partial(16); - sha1_ce_transform(blocks, data, sctx->state, - partial ? sctx->buffer : NULL, 0); - kernel_neon_end(); - - data += blocks * SHA1_BLOCK_SIZE; - partial = 0; - } - if (len) - memcpy(sctx->buffer + partial, data, len); - return 0; -} - -static int sha1_final(struct shash_desc *desc, u8 *out) -{ - static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; - - struct sha1_state *sctx = shash_desc_ctx(desc); - __be64 bits = cpu_to_be64(sctx->count << 3); - __be32 *dst = (__be32 *)out; - int i; - - u32 padlen = SHA1_BLOCK_SIZE - - ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE); - - sha1_update(desc, padding, padlen); - sha1_update(desc, (const u8 *)&bits, sizeof(bits)); - - for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++) - put_unaligned_be32(sctx->state[i], dst++); - - *sctx = (struct sha1_state){}; - return 0; -} - -static int sha1_finup(struct shash_desc *desc, const u8 *data, - unsigned int len, u8 *out) -{ - struct sha1_state *sctx = shash_desc_ctx(desc); - __be32 *dst = (__be32 *)out; - int blocks; - int i; - - if (sctx->count || !len || (len % SHA1_BLOCK_SIZE)) { - sha1_update(desc, data, len); - return sha1_final(desc, out); - } - - /* - * Use a fast path if the input is a multiple of 64 bytes. In - * this case, there is no need to copy data around, and we can - * perform the entire digest calculation in a single invocation - * of sha1_ce_transform() - */ - blocks = len / SHA1_BLOCK_SIZE; + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + sctx->finalize = 0; kernel_neon_begin_partial(16); - sha1_ce_transform(blocks, data, sctx->state, NULL, len); + sha1_base_do_update(desc, data, len, + (sha1_block_fn *)sha1_ce_transform); kernel_neon_end(); - for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++) - put_unaligned_be32(sctx->state[i], dst++); - - *sctx = (struct sha1_state){}; return 0; } -static int sha1_export(struct shash_desc *desc, void *out) +static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) { - struct sha1_state *sctx = shash_desc_ctx(desc); - struct sha1_state *dst = out; + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE); - *dst = *sctx; - return 0; + ASM_EXPORT(sha1_ce_offsetof_count, + offsetof(struct sha1_ce_state, sst.count)); + ASM_EXPORT(sha1_ce_offsetof_finalize, + offsetof(struct sha1_ce_state, finalize)); + + /* + * Allow the asm code to perform the finalization if there is no + * partial data and the input is a round multiple of the block size. + */ + sctx->finalize = finalize; + + kernel_neon_begin_partial(16); + sha1_base_do_update(desc, data, len, + (sha1_block_fn *)sha1_ce_transform); + if (!finalize) + sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); + kernel_neon_end(); + return sha1_base_finish(desc, out); } -static int sha1_import(struct shash_desc *desc, const void *in) +static int sha1_ce_final(struct shash_desc *desc, u8 *out) { - struct sha1_state *sctx = shash_desc_ctx(desc); - struct sha1_state const *src = in; - - *sctx = *src; - return 0; + kernel_neon_begin_partial(16); + sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); + kernel_neon_end(); + return sha1_base_finish(desc, out); } static struct shash_alg alg = { - .init = sha1_init, - .update = sha1_update, - .final = sha1_final, - .finup = sha1_finup, - .export = sha1_export, - .import = sha1_import, - .descsize = sizeof(struct sha1_state), + .init = sha1_base_init, + .update = sha1_ce_update, + .final = sha1_ce_final, + .finup = sha1_ce_finup, + .descsize = sizeof(struct sha1_ce_state), .digestsize = SHA1_DIGEST_SIZE, - .statesize = sizeof(struct sha1_state), .base = { .cra_name = "sha1", .cra_driver_name = "sha1-ce",