[PATCH v4 10/16] crypto/arm: move SHA-224/256 ASM/NEON implementation to base layer
Ard Biesheuvel
ard.biesheuvel at linaro.org
Thu Apr 9 03:55:42 PDT 2015
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 at linaro.org>
---
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 <linux/types.h>
#include <linux/string.h>
#include <crypto/sha.h>
-#include <asm/byteorder.h>
+#include <crypto/sha256_base.h>
#include <asm/simd.h>
#include <asm/neon.h>
+
#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 <linux/crypto.h>
-#include <crypto/sha.h>
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 <linux/types.h>
#include <linux/string.h>
#include <crypto/sha.h>
+#include <crypto/sha256_base.h>
#include <asm/byteorder.h>
#include <asm/simd.h>
#include <asm/neon.h>
+
#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",
--
1.8.3.2
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