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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 <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
dde00981e6
commit
b59e2ae369
@ -24,165 +24,49 @@
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#include <linux/types.h>
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#include <linux/string.h>
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#include <crypto/sha.h>
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#include <asm/byteorder.h>
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#include <crypto/sha256_base.h>
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#include <asm/simd.h>
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#include <asm/neon.h>
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#include "sha256_glue.h"
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asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
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unsigned int num_blks);
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unsigned int num_blks);
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int sha256_init(struct shash_desc *desc)
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int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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/* make sure casting to sha256_block_fn() is safe */
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BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
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sctx->state[0] = SHA256_H0;
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sctx->state[1] = SHA256_H1;
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sctx->state[2] = SHA256_H2;
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sctx->state[3] = SHA256_H3;
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sctx->state[4] = SHA256_H4;
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sctx->state[5] = SHA256_H5;
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sctx->state[6] = SHA256_H6;
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sctx->state[7] = SHA256_H7;
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sctx->count = 0;
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return 0;
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return sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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}
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EXPORT_SYMBOL(crypto_sha256_arm_update);
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int sha224_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA224_H0;
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sctx->state[1] = SHA224_H1;
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sctx->state[2] = SHA224_H2;
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sctx->state[3] = SHA224_H3;
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sctx->state[4] = SHA224_H4;
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sctx->state[5] = SHA224_H5;
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sctx->state[6] = SHA224_H6;
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sctx->state[7] = SHA224_H7;
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sctx->count = 0;
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return 0;
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}
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int __sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len,
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unsigned int partial)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int done = 0;
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sctx->count += len;
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if (partial) {
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done = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, done);
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sha256_block_data_order(sctx->state, sctx->buf, 1);
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}
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if (len - done >= SHA256_BLOCK_SIZE) {
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const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
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sha256_block_data_order(sctx->state, data + done, rounds);
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done += rounds * SHA256_BLOCK_SIZE;
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}
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memcpy(sctx->buf, data + done, len - done);
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return 0;
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}
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int sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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/* Handle the fast case right here */
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if (partial + len < SHA256_BLOCK_SIZE) {
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sctx->count += len;
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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return __sha256_update(desc, data, len, partial);
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}
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/* Add padding and return the message digest. */
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static int sha256_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int i, index, padlen;
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__be32 *dst = (__be32 *)out;
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__be64 bits;
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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/* save number of bits */
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 and append length */
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index = sctx->count % SHA256_BLOCK_SIZE;
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padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index);
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/* We need to fill a whole block for __sha256_update */
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if (padlen <= 56) {
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sctx->count += padlen;
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memcpy(sctx->buf + index, padding, padlen);
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} else {
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__sha256_update(desc, padding, padlen, index);
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}
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__sha256_update(desc, (const u8 *)&bits, sizeof(bits), 56);
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_data_order);
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return sha256_base_finish(desc, out);
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}
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static int sha224_final(struct shash_desc *desc, u8 *out)
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int crypto_sha256_arm_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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u8 D[SHA256_DIGEST_SIZE];
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sha256_final(desc, D);
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memcpy(out, D, SHA224_DIGEST_SIZE);
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memzero_explicit(D, SHA256_DIGEST_SIZE);
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return 0;
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}
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int sha256_export(struct shash_desc *desc, void *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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int sha256_import(struct shash_desc *desc, const void *in)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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return sha256_final(desc, out);
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}
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EXPORT_SYMBOL(crypto_sha256_arm_finup);
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static struct shash_alg algs[] = { {
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.digestsize = SHA256_DIGEST_SIZE,
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.init = sha256_init,
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.update = sha256_update,
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.init = sha256_base_init,
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.update = crypto_sha256_arm_update,
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.final = sha256_final,
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.export = sha256_export,
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.import = sha256_import,
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.finup = crypto_sha256_arm_finup,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-asm",
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@ -193,13 +77,11 @@ static struct shash_alg algs[] = { {
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}
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}, {
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.digestsize = SHA224_DIGEST_SIZE,
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.init = sha224_init,
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.update = sha256_update,
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.final = sha224_final,
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.export = sha256_export,
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.import = sha256_import,
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.init = sha224_base_init,
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.update = crypto_sha256_arm_update,
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.final = sha256_final,
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.finup = crypto_sha256_arm_finup,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-asm",
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@ -2,22 +2,13 @@
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#define _CRYPTO_SHA256_GLUE_H
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#include <linux/crypto.h>
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#include <crypto/sha.h>
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extern struct shash_alg sha256_neon_algs[2];
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extern int sha256_init(struct shash_desc *desc);
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int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
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unsigned int len);
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extern int sha224_init(struct shash_desc *desc);
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extern int __sha256_update(struct shash_desc *desc, const u8 *data,
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unsigned int len, unsigned int partial);
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extern int sha256_update(struct shash_desc *desc, const u8 *data,
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unsigned int len);
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extern int sha256_export(struct shash_desc *desc, void *out);
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extern int sha256_import(struct shash_desc *desc, const void *in);
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int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *hash);
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#endif /* _CRYPTO_SHA256_GLUE_H */
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@ -19,131 +19,62 @@
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#include <linux/types.h>
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#include <linux/string.h>
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#include <crypto/sha.h>
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#include <crypto/sha256_base.h>
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#include <asm/byteorder.h>
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#include <asm/simd.h>
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#include <asm/neon.h>
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#include "sha256_glue.h"
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asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data,
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unsigned int num_blks);
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unsigned int num_blks);
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static int __sha256_neon_update(struct shash_desc *desc, const u8 *data,
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unsigned int len, unsigned int partial)
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static int sha256_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int done = 0;
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sctx->count += len;
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if (!may_use_simd() ||
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(sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
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return crypto_sha256_arm_update(desc, data, len);
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if (partial) {
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done = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, done);
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sha256_block_data_order_neon(sctx->state, sctx->buf, 1);
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}
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if (len - done >= SHA256_BLOCK_SIZE) {
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const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
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sha256_block_data_order_neon(sctx->state, data + done, rounds);
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done += rounds * SHA256_BLOCK_SIZE;
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}
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memcpy(sctx->buf, data + done, len - done);
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kernel_neon_begin();
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order_neon);
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kernel_neon_end();
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return 0;
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}
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static int sha256_neon_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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static int sha256_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 sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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int res;
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if (!may_use_simd())
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return crypto_sha256_arm_finup(desc, data, len, out);
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/* Handle the fast case right here */
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if (partial + len < SHA256_BLOCK_SIZE) {
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sctx->count += len;
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memcpy(sctx->buf + partial, data, len);
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kernel_neon_begin();
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if (len)
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order_neon);
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_data_order_neon);
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kernel_neon_end();
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return 0;
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}
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if (!may_use_simd()) {
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res = __sha256_update(desc, data, len, partial);
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} else {
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kernel_neon_begin();
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res = __sha256_neon_update(desc, data, len, partial);
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kernel_neon_end();
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}
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return res;
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return sha256_base_finish(desc, out);
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}
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/* Add padding and return the message digest. */
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static int sha256_neon_final(struct shash_desc *desc, u8 *out)
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static int sha256_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int i, index, padlen;
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__be32 *dst = (__be32 *)out;
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__be64 bits;
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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/* save number of bits */
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 and append length */
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index = sctx->count % SHA256_BLOCK_SIZE;
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padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index);
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if (!may_use_simd()) {
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sha256_update(desc, padding, padlen);
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sha256_update(desc, (const u8 *)&bits, sizeof(bits));
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} else {
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kernel_neon_begin();
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/* We need to fill a whole block for __sha256_neon_update() */
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if (padlen <= 56) {
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sctx->count += padlen;
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memcpy(sctx->buf + index, padding, padlen);
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} else {
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__sha256_neon_update(desc, padding, padlen, index);
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}
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__sha256_neon_update(desc, (const u8 *)&bits,
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sizeof(bits), 56);
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kernel_neon_end();
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}
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memzero_explicit(sctx, sizeof(*sctx));
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return 0;
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}
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static int sha224_neon_final(struct shash_desc *desc, u8 *out)
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{
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u8 D[SHA256_DIGEST_SIZE];
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sha256_neon_final(desc, D);
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memcpy(out, D, SHA224_DIGEST_SIZE);
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memzero_explicit(D, SHA256_DIGEST_SIZE);
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return 0;
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return sha256_finup(desc, NULL, 0, out);
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}
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struct shash_alg sha256_neon_algs[] = { {
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.digestsize = SHA256_DIGEST_SIZE,
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.init = sha256_init,
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.update = sha256_neon_update,
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.final = sha256_neon_final,
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.export = sha256_export,
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.import = sha256_import,
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.init = sha256_base_init,
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.update = sha256_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-neon",
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@ -154,13 +85,11 @@ struct shash_alg sha256_neon_algs[] = { {
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}
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}, {
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.digestsize = SHA224_DIGEST_SIZE,
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.init = sha224_init,
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.update = sha256_neon_update,
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.final = sha224_neon_final,
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.export = sha256_export,
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.import = sha256_import,
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.init = sha224_base_init,
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.update = sha256_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-neon",
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