dlan17/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

crypto: powerpc/sha256-spe - Use API partial block handling

Browse Source 
Use the Crypto API partial block handling.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2025-04-23 15:52:46 +08:00
parent a417f16f88
commit 9cd9c99be1
1 changed files with 30 additions and 137 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/powerpc/crypto/sha256-spe-glue.c
+30 -137
View File
@@ -8,16 +8,13 @@
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
*/
#include <asm/switch_to.h>
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/sha2.h>
#include <crypto/sha256_base.h>
#include <asm/byteorder.h>
#include <asm/switch_to.h>
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/preempt.h>
/*
* MAX_BYTES defines the number of bytes that are allowed to be processed
@@ -47,151 +44,48 @@ static void spe_end(void)
preempt_enable();
}
static inline void ppc_sha256_clear_context(struct sha256_state *sctx)
static void ppc_spe_sha256_block(struct crypto_sha256_state *sctx,
const u8 *src, int blocks)
{
int count = sizeof(struct sha256_state) >> 2;
u32 *ptr = (u32 *)sctx;
do {
/* cut input data into smaller blocks */
int unit = min(blocks, MAX_BYTES / SHA256_BLOCK_SIZE);
/* make sure we can clear the fast way */
BUILD_BUG_ON(sizeof(struct sha256_state) % 4);
do { *ptr++ = 0; } while (--count);
spe_begin();
ppc_spe_sha256_transform(sctx->state, src, unit);
spe_end();
src += unit * SHA256_BLOCK_SIZE;
blocks -= unit;
} while (blocks);
}
static int ppc_spe_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
const unsigned int offset = sctx->count & 0x3f;
const unsigned int avail = 64 - offset;
unsigned int bytes;
const u8 *src = data;
if (avail > len) {
sctx->count += len;
memcpy((char *)sctx->buf + offset, src, len);
return 0;
}
sctx->count += len;
if (offset) {
memcpy((char *)sctx->buf + offset, src, avail);
spe_begin();
ppc_spe_sha256_transform(sctx->state, (const u8 *)sctx->buf, 1);
spe_end();
len -= avail;
src += avail;
}
while (len > 63) {
/* cut input data into smaller blocks */
bytes = (len > MAX_BYTES) ? MAX_BYTES : len;
bytes = bytes & ~0x3f;
spe_begin();
ppc_spe_sha256_transform(sctx->state, src, bytes >> 6);
spe_end();
src += bytes;
len -= bytes;
}
memcpy((char *)sctx->buf, src, len);
return 0;
return sha256_base_do_update_blocks(desc, data, len,
ppc_spe_sha256_block);
}
static int ppc_spe_sha256_final(struct shash_desc *desc, u8 *out)
static int ppc_spe_sha256_finup(struct shash_desc *desc, const u8 *src,
unsigned int len, u8 *out)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
const unsigned int offset = sctx->count & 0x3f;
char *p = (char *)sctx->buf + offset;
int padlen;
__be64 *pbits = (__be64 *)(((char *)&sctx->buf) + 56);
__be32 *dst = (__be32 *)out;
padlen = 55 - offset;
*p++ = 0x80;
spe_begin();
if (padlen < 0) {
memset(p, 0x00, padlen + sizeof (u64));
ppc_spe_sha256_transform(sctx->state, sctx->buf, 1);
p = (char *)sctx->buf;
padlen = 56;
}
memset(p, 0, padlen);
*pbits = cpu_to_be64(sctx->count << 3);
ppc_spe_sha256_transform(sctx->state, sctx->buf, 1);
spe_end();
dst[0] = cpu_to_be32(sctx->state[0]);
dst[1] = cpu_to_be32(sctx->state[1]);
dst[2] = cpu_to_be32(sctx->state[2]);
dst[3] = cpu_to_be32(sctx->state[3]);
dst[4] = cpu_to_be32(sctx->state[4]);
dst[5] = cpu_to_be32(sctx->state[5]);
dst[6] = cpu_to_be32(sctx->state[6]);
dst[7] = cpu_to_be32(sctx->state[7]);
ppc_sha256_clear_context(sctx);
return 0;
}
static int ppc_spe_sha224_final(struct shash_desc *desc, u8 *out)
{
__be32 D[SHA256_DIGEST_SIZE >> 2];
__be32 *dst = (__be32 *)out;
ppc_spe_sha256_final(desc, (u8 *)D);
/* avoid bytewise memcpy */
dst[0] = D[0];
dst[1] = D[1];
dst[2] = D[2];
dst[3] = D[3];
dst[4] = D[4];
dst[5] = D[5];
dst[6] = D[6];
/* clear sensitive data */
memzero_explicit(D, SHA256_DIGEST_SIZE);
return 0;
}
static int ppc_spe_sha256_export(struct shash_desc *desc, void *out)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
memcpy(out, sctx, sizeof(*sctx));
return 0;
}
static int ppc_spe_sha256_import(struct shash_desc *desc, const void *in)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
memcpy(sctx, in, sizeof(*sctx));
return 0;
sha256_base_do_finup(desc, src, len, ppc_spe_sha256_block);
return sha256_base_finish(desc, out);
}
static struct shash_alg algs[2] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = ppc_spe_sha256_update,
.final = ppc_spe_sha256_final,
.export = ppc_spe_sha256_export,
.import = ppc_spe_sha256_import,
.descsize = sizeof(struct sha256_state),
.statesize = sizeof(struct sha256_state),
.finup = ppc_spe_sha256_finup,
.descsize = sizeof(struct crypto_sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name= "sha256-ppc-spe",
.cra_priority = 300,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY |
CRYPTO_AHASH_ALG_FINUP_MAX,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
@@ -199,15 +93,14 @@ static struct shash_alg algs[2] = { {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = ppc_spe_sha256_update,
.final = ppc_spe_sha224_final,
.export = ppc_spe_sha256_export,
.import = ppc_spe_sha256_import,
.descsize = sizeof(struct sha256_state),
.statesize = sizeof(struct sha256_state),
.finup = ppc_spe_sha256_finup,
.descsize = sizeof(struct crypto_sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name= "sha224-ppc-spe",
.cra_priority = 300,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY |
CRYPTO_AHASH_ALG_FINUP_MAX,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}