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Update HKDF API

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This commit is contained in:
Zhi Guan
2024-07-26 22:42:37 +08:00
parent 228f78963c
commit fac04b76f8
2 changed files with 18 additions and 35 deletions
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4
include/gmssl/hkdf.h
View File

@@ -32,9 +32,9 @@ int hkdf_expand(const DIGEST *digest, const uint8_t *prk, size_t prklen,
int sm3_hkdf_extract(const uint8_t *salt, size_t saltlen,
const uint8_t *ikm, size_t ikmlen,
uint8_t *prk, size_t *prklen);
uint8_t prk[32]);
int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
int sm3_hkdf_expand(const uint8_t prk[32],
const uint8_t *opt_info, size_t opt_infolen,
size_t L, uint8_t *okm);

49
src/hkdf.c
View File

@@ -123,36 +123,26 @@ int hkdf_expand(const DIGEST *digest, const uint8_t *prk, size_t prklen,
return 1;
}
/*
int sm3_hkdf_extract(const uint8_t *salt, size_t saltlen,
const uint8_t *ikm, size_t ikmlen,
uint8_t *prk, size_t *prklen)
uint8_t prk[32])
{
SM3_HMAC_CTX hmac_ctx;
if (!salt || saltlen == 0) {
uint8_t zeros[SM3_HMAC_SIZE] = {0};
if (sm3_hmac_init(&hmac_ctx, zeros, SM3_HMAC_SIZE) != 1) {
error_print();
return -1;
}
sm3_hmac_init(&hmac_ctx, zeros, SM3_HMAC_SIZE);
} else {
if (sm3_hmac_init(&hmac_ctx, salt, saltlen) != 1) {
error_print();
return -1;
}
sm3_hmac_init(&hmac_ctx, salt, saltlen);
}
if (sm3_hmac_update(&hmac_ctx, ikm, ikmlen) != 1
|| sm3_hmac_finish(&hmac_ctx, prk) != 1) {
error_print();
return -1;
}
*prklen = SM3_HMAC_SIZE;
sm3_hmac_update(&hmac_ctx, ikm, ikmlen);
sm3_hmac_finish(&hmac_ctx, prk);
return 1;
}
int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
// the expand can only be called once, if we want to expand multi times, the API should be changed
int sm3_hkdf_expand(const uint8_t prk[32],
const uint8_t *opt_info, size_t opt_infolen,
size_t L, uint8_t *okm)
{
@@ -162,13 +152,10 @@ int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
size_t len;
if (L > 0) {
if (sm3_hmac_init(&hmac_ctx, prk, prklen) != 1
|| sm3_hmac_update(&hmac_ctx, opt_info, opt_infolen) < 0
|| sm3_hmac_update(&hmac_ctx, &counter, 1) != 1
|| sm3_hmac_finish(&hmac_ctx, T) != 1) {
error_print();
return -1;
}
sm3_hmac_init(&hmac_ctx, prk, 32);
sm3_hmac_update(&hmac_ctx, opt_info, opt_infolen);
sm3_hmac_update(&hmac_ctx, &counter, 1);
sm3_hmac_finish(&hmac_ctx, T);
counter++;
len = SM3_HMAC_SIZE;
if (len > L) {
@@ -183,14 +170,11 @@ int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
error_print();
return -1;
}
if (sm3_hmac_init(&hmac_ctx, digest, prk, prklen) != 1
|| sm3_hmac_update(&hmac_ctx, T, len) != 1
|| sm3_hmac_update(&hmac_ctx, opt_info, opt_infolen) < 0
|| sm3_hmac_update(&hmac_ctx, &counter, 1) != 1
|| sm3_hmac_finish(&hmac_ctx, T) != 1) {
error_print();
return -1;
}
sm3_hmac_init(&hmac_ctx, prk, 32);
sm3_hmac_update(&hmac_ctx, T, len);
sm3_hmac_update(&hmac_ctx, opt_info, opt_infolen);
sm3_hmac_update(&hmac_ctx, &counter, 1);
sm3_hmac_finish(&hmac_ctx, T);
counter++;
len = SM3_HMAC_SIZE;
if (len > L) {
@@ -202,4 +186,3 @@ int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
}
return 1;
}
*/