[PATCH 3/8] crypto/generic: sha3 - simplify code
Ard Biesheuvel
ard.biesheuvel at linaro.org
Fri Jan 19 04:04:35 PST 2018
In preparation of exposing the generic SHA3 implementation to other
versions as a fallback, simplify the code, and remove an inconsistency
in the output handling (endian swabbing rsizw words of state before
writing the output does not make sense)
Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
crypto/sha3_generic.c | 184 +++++++-------------
include/crypto/sha3.h | 1 -
2 files changed, 59 insertions(+), 126 deletions(-)
diff --git a/crypto/sha3_generic.c b/crypto/sha3_generic.c
index 5fecb609e3be..c7084a24eaf9 100644
--- a/crypto/sha3_generic.c
+++ b/crypto/sha3_generic.c
@@ -18,7 +18,6 @@
#include <linux/module.h>
#include <linux/types.h>
#include <crypto/sha3.h>
-#include <asm/byteorder.h>
#include <asm/unaligned.h>
#define KECCAK_ROUNDS 24
@@ -146,43 +145,16 @@ static void __attribute__((__optimize__("O3"))) keccakf(u64 st[25])
}
}
-static void sha3_init(struct sha3_state *sctx, unsigned int digest_sz)
-{
- memset(sctx, 0, sizeof(*sctx));
- sctx->md_len = digest_sz;
- sctx->rsiz = 200 - 2 * digest_sz;
- sctx->rsizw = sctx->rsiz / 8;
-}
-
-static int sha3_224_init(struct shash_desc *desc)
+static int sha3_init(struct shash_desc *desc)
{
struct sha3_state *sctx = shash_desc_ctx(desc);
+ unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
- sha3_init(sctx, SHA3_224_DIGEST_SIZE);
- return 0;
-}
-
-static int sha3_256_init(struct shash_desc *desc)
-{
- struct sha3_state *sctx = shash_desc_ctx(desc);
-
- sha3_init(sctx, SHA3_256_DIGEST_SIZE);
- return 0;
-}
-
-static int sha3_384_init(struct shash_desc *desc)
-{
- struct sha3_state *sctx = shash_desc_ctx(desc);
-
- sha3_init(sctx, SHA3_384_DIGEST_SIZE);
- return 0;
-}
-
-static int sha3_512_init(struct shash_desc *desc)
-{
- struct sha3_state *sctx = shash_desc_ctx(desc);
+ sctx->rsiz = 200 - 2 * digest_size;
+ sctx->rsizw = sctx->rsiz / 8;
+ sctx->partial = 0;
- sha3_init(sctx, SHA3_512_DIGEST_SIZE);
+ memset(sctx->st, 0, sizeof(sctx->st));
return 0;
}
@@ -227,6 +199,8 @@ static int sha3_final(struct shash_desc *desc, u8 *out)
{
struct sha3_state *sctx = shash_desc_ctx(desc);
unsigned int i, inlen = sctx->partial;
+ unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
+ __le64 *digest = (__le64 *)out;
sctx->buf[inlen++] = 0x06;
memset(sctx->buf + inlen, 0, sctx->rsiz - inlen);
@@ -237,110 +211,70 @@ static int sha3_final(struct shash_desc *desc, u8 *out)
keccakf(sctx->st);
- for (i = 0; i < sctx->rsizw; i++)
- sctx->st[i] = cpu_to_le64(sctx->st[i]);
+ for (i = 0; i < digest_size / 8; i++)
+ put_unaligned_le64(sctx->st[i], digest++);
- memcpy(out, sctx->st, sctx->md_len);
+ if (digest_size & 4)
+ put_unaligned_le32(sctx->st[i], (__le32 *)digest);
memset(sctx, 0, sizeof(*sctx));
return 0;
}
-static struct shash_alg sha3_224 = {
- .digestsize = SHA3_224_DIGEST_SIZE,
- .init = sha3_224_init,
- .update = sha3_update,
- .final = sha3_final,
- .descsize = sizeof(struct sha3_state),
- .base = {
- .cra_name = "sha3-224",
- .cra_driver_name = "sha3-224-generic",
- .cra_flags = CRYPTO_ALG_TYPE_SHASH,
- .cra_blocksize = SHA3_224_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static struct shash_alg sha3_256 = {
- .digestsize = SHA3_256_DIGEST_SIZE,
- .init = sha3_256_init,
- .update = sha3_update,
- .final = sha3_final,
- .descsize = sizeof(struct sha3_state),
- .base = {
- .cra_name = "sha3-256",
- .cra_driver_name = "sha3-256-generic",
- .cra_flags = CRYPTO_ALG_TYPE_SHASH,
- .cra_blocksize = SHA3_256_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static struct shash_alg sha3_384 = {
- .digestsize = SHA3_384_DIGEST_SIZE,
- .init = sha3_384_init,
- .update = sha3_update,
- .final = sha3_final,
- .descsize = sizeof(struct sha3_state),
- .base = {
- .cra_name = "sha3-384",
- .cra_driver_name = "sha3-384-generic",
- .cra_flags = CRYPTO_ALG_TYPE_SHASH,
- .cra_blocksize = SHA3_384_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static struct shash_alg sha3_512 = {
- .digestsize = SHA3_512_DIGEST_SIZE,
- .init = sha3_512_init,
- .update = sha3_update,
- .final = sha3_final,
- .descsize = sizeof(struct sha3_state),
- .base = {
- .cra_name = "sha3-512",
- .cra_driver_name = "sha3-512-generic",
- .cra_flags = CRYPTO_ALG_TYPE_SHASH,
- .cra_blocksize = SHA3_512_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
+static struct shash_alg algs[] = { {
+ .digestsize = SHA3_224_DIGEST_SIZE,
+ .init = sha3_init,
+ .update = sha3_update,
+ .final = sha3_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-224",
+ .base.cra_driver_name = "sha3-224-generic",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_224_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_256_DIGEST_SIZE,
+ .init = sha3_init,
+ .update = sha3_update,
+ .final = sha3_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-256",
+ .base.cra_driver_name = "sha3-256-generic",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_256_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_384_DIGEST_SIZE,
+ .init = sha3_init,
+ .update = sha3_update,
+ .final = sha3_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-384",
+ .base.cra_driver_name = "sha3-384-generic",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_384_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_512_DIGEST_SIZE,
+ .init = sha3_init,
+ .update = sha3_update,
+ .final = sha3_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-512",
+ .base.cra_driver_name = "sha3-512-generic",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_512_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+} };
static int __init sha3_generic_mod_init(void)
{
- int ret;
-
- ret = crypto_register_shash(&sha3_224);
- if (ret < 0)
- goto err_out;
- ret = crypto_register_shash(&sha3_256);
- if (ret < 0)
- goto err_out_224;
- ret = crypto_register_shash(&sha3_384);
- if (ret < 0)
- goto err_out_256;
- ret = crypto_register_shash(&sha3_512);
- if (ret < 0)
- goto err_out_384;
-
- return 0;
-
-err_out_384:
- crypto_unregister_shash(&sha3_384);
-err_out_256:
- crypto_unregister_shash(&sha3_256);
-err_out_224:
- crypto_unregister_shash(&sha3_224);
-err_out:
- return ret;
+ return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
static void __exit sha3_generic_mod_fini(void)
{
- crypto_unregister_shash(&sha3_224);
- crypto_unregister_shash(&sha3_256);
- crypto_unregister_shash(&sha3_384);
- crypto_unregister_shash(&sha3_512);
+ crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_init(sha3_generic_mod_init);
diff --git a/include/crypto/sha3.h b/include/crypto/sha3.h
index b9d9bd553b48..1339dcdbc9b2 100644
--- a/include/crypto/sha3.h
+++ b/include/crypto/sha3.h
@@ -19,7 +19,6 @@
struct sha3_state {
u64 st[25];
- unsigned int md_len;
unsigned int rsiz;
unsigned int rsizw;
--
2.11.0
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