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crypto: ccp - Use precalculated hash from headers 

Precalculated hash for empty message are now present in hash headers.
This patch just use them.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
LABBE Corentin 2015-12-17 13:45:41 +01:00 committed by Herbert Xu
parent 8054b8005b
commit bdd75064d2
2 changed files with 10 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/crypto/ccp/Kconfig
View File

@ -3,6 +3,8 @@ config CRYPTO_DEV_CCP_DD
depends on CRYPTO_DEV_CCP
default m
select HW_RANDOM
select CRYPTO_SHA1
select CRYPTO_SHA256
help
Provides the interface to use the AMD Cryptographic Coprocessor
which can be used to offload encryption operations such as SHA,

39
drivers/crypto/ccp/ccp-ops.c
View File

@ -152,32 +152,6 @@ static const __be32 ccp_sha256_init[CCP_SHA_CTXSIZE / sizeof(__be32)] = {
cpu_to_be32(SHA256_H6), cpu_to_be32(SHA256_H7),
};
/* The CCP cannot perform zero-length sha operations so the caller
* is required to buffer data for the final operation. However, a
* sha operation for a message with a total length of zero is valid
* so known values are required to supply the result.
*/
static const u8 ccp_sha1_zero[CCP_SHA_CTXSIZE] = {
0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
0xaf, 0xd8, 0x07, 0x09, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const u8 ccp_sha224_zero[CCP_SHA_CTXSIZE] = {
0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9,
0x47, 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4,
0x15, 0xa2, 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a,
0xc5, 0xb3, 0xe4, 0x2f, 0x00, 0x00, 0x00, 0x00,
};
static const u8 ccp_sha256_zero[CCP_SHA_CTXSIZE] = {
0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55,
};
static u32 ccp_addr_lo(struct ccp_dma_info *info)
{
return lower_32_bits(info->address + info->offset);
@ -1391,18 +1365,21 @@ static int ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
if (sha->msg_bits)
return -EINVAL;
/* A sha operation for a message with a total length of zero,
* return known result.
/* The CCP cannot perform zero-length sha operations so the
* caller is required to buffer data for the final operation.
* However, a sha operation for a message with a total length
* of zero is valid so known values are required to supply
* the result.
*/
switch (sha->type) {
case CCP_SHA_TYPE_1:
sha_zero = ccp_sha1_zero;
sha_zero = sha1_zero_message_hash;
break;
case CCP_SHA_TYPE_224:
sha_zero = ccp_sha224_zero;
sha_zero = sha224_zero_message_hash;
break;
case CCP_SHA_TYPE_256:
sha_zero = ccp_sha256_zero;
sha_zero = sha256_zero_message_hash;
break;
default:
return -EINVAL;