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Update GHASH

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This commit is contained in:
Zhi Guan
2026-06-14 16:24:30 +08:00
parent 25ce3134f8
commit 1d8cf6117c
5 changed files with 69 additions and 13 deletions
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30
src/ghash.c
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@@ -1,5 +1,5 @@
/*
* Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
* Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
@@ -36,13 +36,14 @@ void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen, const uint8_t
gf128_t H;
gf128_t X;
gf128_t L;
uint8_t block[16];
gf128_from_bytes(H, h);
gf128_set_zero(X);
PUTU64(out, (uint64_t)aadlen << 3);
PUTU64(out + 8, (uint64_t)clen << 3);
gf128_from_bytes(L, out);
PUTU64(block, (uint64_t)aadlen << 3);
PUTU64(block + 8, (uint64_t)clen << 3);
gf128_from_bytes(L, block);
while (aadlen) {
gf128_t A;
@@ -51,9 +52,9 @@ void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen, const uint8_t
aad += 16;
aadlen -= 16;
} else {
memset(out, 0, 16);
memcpy(out, aad, aadlen);
gf128_from_bytes(A, out);
memset(block, 0, 16);
memcpy(block, aad, aadlen);
gf128_from_bytes(A, block);
aadlen = 0;
}
gf128_add(X, X, A);
@@ -67,9 +68,9 @@ void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen, const uint8_t
c += 16;
clen -= 16;
} else {
memset(out, 0, 16);
memcpy(out, c, clen);
gf128_from_bytes(C, out);
memset(block, 0, 16);
memcpy(block, c, clen);
gf128_from_bytes(C, block);
clen = 0;
}
gf128_add(X, X, C);
@@ -79,6 +80,11 @@ void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen, const uint8_t
gf128_add(X, X, L);
gf128_mul(H, X, H); // clear secrets in H
gf128_to_bytes(H, out);
gmssl_secure_clear(H, sizeof(H));
gmssl_secure_clear(X, sizeof(X));
gmssl_secure_clear(L, sizeof(L));
gmssl_secure_clear(block, sizeof(block));
}
void ghash_init(GHASH_CTX *ctx, const uint8_t h[16], const uint8_t *aad, size_t aadlen)
@@ -113,6 +119,10 @@ void ghash_update(GHASH_CTX *ctx, const uint8_t *c, size_t clen)
assert(ctx->num < 16);
if (!clen) {
return;
}
ctx->clen += clen;
if (ctx->num) {