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 <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
Родитель
9205b94923
Коммит
07eb54d306
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@ -66,8 +66,8 @@
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.word 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6
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/*
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* void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
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* u8 *head, long bytes)
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* void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
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* int blocks)
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*/
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ENTRY(sha1_ce_transform)
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/* load round constants */
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@ -78,25 +78,22 @@ ENTRY(sha1_ce_transform)
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ld1r {k3.4s}, [x6]
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/* load state */
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ldr dga, [x2]
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ldr dgb, [x2, #16]
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ldr dga, [x0]
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ldr dgb, [x0, #16]
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/* load partial state (if supplied) */
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cbz x3, 0f
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ld1 {v8.4s-v11.4s}, [x3]
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b 1f
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/* load sha1_ce_state::finalize */
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ldr w4, [x0, #:lo12:sha1_ce_offsetof_finalize]
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/* load input */
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0: ld1 {v8.4s-v11.4s}, [x1], #64
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sub w0, w0, #1
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sub w2, w2, #1
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1:
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CPU_LE( rev32 v8.16b, v8.16b )
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CPU_LE( rev32 v9.16b, v9.16b )
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CPU_LE( rev32 v10.16b, v10.16b )
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CPU_LE( rev32 v11.16b, v11.16b )
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2: add t0.4s, v8.4s, k0.4s
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1: add t0.4s, v8.4s, k0.4s
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mov dg0v.16b, dgav.16b
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add_update c, ev, k0, 8, 9, 10, 11, dgb
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@ -127,15 +124,15 @@ CPU_LE( rev32 v11.16b, v11.16b )
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add dgbv.2s, dgbv.2s, dg1v.2s
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add dgav.4s, dgav.4s, dg0v.4s
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cbnz w0, 0b
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cbnz w2, 0b
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/*
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* Final block: add padding and total bit count.
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* Skip if we have no total byte count in x4. In that case, the input
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* size was not a round multiple of the block size, and the padding is
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* handled by the C code.
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* Skip if the input size was not a round multiple of the block size,
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* the padding is handled by the C code in that case.
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*/
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cbz x4, 3f
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ldr x4, [x0, #:lo12:sha1_ce_offsetof_count]
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movi v9.2d, #0
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mov x8, #0x80000000
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movi v10.2d, #0
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@ -144,10 +141,10 @@ CPU_LE( rev32 v11.16b, v11.16b )
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mov x4, #0
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mov v11.d[0], xzr
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mov v11.d[1], x7
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b 2b
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b 1b
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/* store new state */
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3: str dga, [x2]
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str dgb, [x2, #16]
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3: str dga, [x0]
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str dgb, [x0, #16]
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ret
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ENDPROC(sha1_ce_transform)
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@ -12,144 +12,81 @@
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#include <asm/unaligned.h>
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <crypto/sha1_base.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#define ASM_EXPORT(sym, val) \
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asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val));
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MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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asmlinkage void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
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u8 *head, long bytes);
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struct sha1_ce_state {
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struct sha1_state sst;
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u32 finalize;
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};
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static int sha1_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
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int blocks);
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*sctx = (struct sha1_state){
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.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
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};
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return 0;
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}
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static int sha1_update(struct shash_desc *desc, const u8 *data,
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static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
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sctx->count += len;
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if ((partial + len) >= SHA1_BLOCK_SIZE) {
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int blocks;
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if (partial) {
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int p = SHA1_BLOCK_SIZE - partial;
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memcpy(sctx->buffer + partial, data, p);
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data += p;
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len -= p;
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}
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blocks = len / SHA1_BLOCK_SIZE;
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len %= SHA1_BLOCK_SIZE;
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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sctx->finalize = 0;
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kernel_neon_begin_partial(16);
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sha1_ce_transform(blocks, data, sctx->state,
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partial ? sctx->buffer : NULL, 0);
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sha1_base_do_update(desc, data, len,
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(sha1_block_fn *)sha1_ce_transform);
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kernel_neon_end();
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data += blocks * SHA1_BLOCK_SIZE;
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partial = 0;
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}
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if (len)
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memcpy(sctx->buffer + partial, data, len);
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return 0;
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}
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static int sha1_final(struct shash_desc *desc, u8 *out)
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{
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static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be64 bits = cpu_to_be64(sctx->count << 3);
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__be32 *dst = (__be32 *)out;
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int i;
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u32 padlen = SHA1_BLOCK_SIZE
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- ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE);
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sha1_update(desc, padding, padlen);
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sha1_update(desc, (const u8 *)&bits, sizeof(bits));
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha1_state){};
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return 0;
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}
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static int sha1_finup(struct shash_desc *desc, const u8 *data,
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static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int blocks;
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int i;
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
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if (sctx->count || !len || (len % SHA1_BLOCK_SIZE)) {
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sha1_update(desc, data, len);
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return sha1_final(desc, out);
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}
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ASM_EXPORT(sha1_ce_offsetof_count,
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offsetof(struct sha1_ce_state, sst.count));
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ASM_EXPORT(sha1_ce_offsetof_finalize,
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offsetof(struct sha1_ce_state, finalize));
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/*
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* Use a fast path if the input is a multiple of 64 bytes. In
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* this case, there is no need to copy data around, and we can
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* perform the entire digest calculation in a single invocation
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* of sha1_ce_transform()
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* Allow the asm code to perform the finalization if there is no
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* partial data and the input is a round multiple of the block size.
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*/
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blocks = len / SHA1_BLOCK_SIZE;
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sctx->finalize = finalize;
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kernel_neon_begin_partial(16);
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sha1_ce_transform(blocks, data, sctx->state, NULL, len);
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sha1_base_do_update(desc, data, len,
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(sha1_block_fn *)sha1_ce_transform);
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if (!finalize)
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sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
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kernel_neon_end();
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha1_state){};
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return 0;
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return sha1_base_finish(desc, out);
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}
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static int sha1_export(struct shash_desc *desc, void *out)
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static int sha1_ce_final(struct shash_desc *desc, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state *dst = out;
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*dst = *sctx;
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return 0;
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}
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static int sha1_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state const *src = in;
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*sctx = *src;
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return 0;
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kernel_neon_begin_partial(16);
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sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
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kernel_neon_end();
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return sha1_base_finish(desc, out);
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}
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static struct shash_alg alg = {
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.init = sha1_init,
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.update = sha1_update,
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.final = sha1_final,
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.finup = sha1_finup,
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.export = sha1_export,
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.import = sha1_import,
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.descsize = sizeof(struct sha1_state),
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.init = sha1_base_init,
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.update = sha1_ce_update,
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.final = sha1_ce_final,
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.finup = sha1_ce_finup,
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.descsize = sizeof(struct sha1_ce_state),
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.digestsize = SHA1_DIGEST_SIZE,
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name = "sha1-ce",
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