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S390X: Accelerate keccak XOF

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The keccak XOF used for KMAC can be simplified by using klmd.  This speeds up
XOF processing in cases where more than one result block is needed.

Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20431)
This commit is contained in:
Juergen Christ 2023-03-03 14:36:08 +01:00 committed by Tomas Mraz
parent 12c4e67675
commit de13699370
2 changed files with 6 additions and 8 deletions
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1
crypto/s390x_arch.h
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@ -182,5 +182,6 @@ extern int OPENSSL_s390xcex;
# define S390X_KMA_LAAD 0x200
# define S390X_KMA_HS 0x400
# define S390X_KDSA_D 0x80
# define S390X_KLMD_PS 0x100
#endif

13
providers/implementations/digests/sha3_prov.c
View File

@ -183,7 +183,6 @@ static int s390x_keccakc_final(unsigned char *md, void *vctx, int padding)
size_t bsz = ctx->block_size;
size_t num = ctx->bufsz;
size_t needed = ctx->md_size;
static const unsigned char empty[KECCAK1600_WIDTH / 8] = {0};
if (!ossl_prov_is_running())
return 0;
@ -193,13 +192,11 @@ static int s390x_keccakc_final(unsigned char *md, void *vctx, int padding)
ctx->buf[num] = padding;
ctx->buf[bsz - 1] |= 0x80;
s390x_kimd(ctx->buf, bsz, ctx->pad, ctx->A);
while (needed > bsz) {
memcpy(md, ctx->A, bsz);
needed -= bsz;
md += bsz;
s390x_kimd(empty, bsz, ctx->pad, ctx->A);
}
memcpy(md, ctx->A, needed);
num = needed > bsz ? bsz : needed;
memcpy(md, ctx->A, num);
needed -= num;
if (needed > 0)
s390x_klmd(NULL, 0, md + bsz, needed, ctx->pad | S390X_KLMD_PS, ctx->A);
return 1;
}