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ecc.c and test.c changes to add support in ecc_sign_determinsitic.c #7700

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merged 8 commits into from
Jul 16, 2024
Merged

ecc.c and test.c changes to add support in ecc_sign_determinsitic.c #7700

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b5b0e17
ecc.c and test.c changes to add support in ecc_sign_determinsitic.c f…
Jun 28, 2024
c07e7f1
Fixed async test for test.c deterministic K.
Jul 1, 2024
ac7f44b
Fix the async tests for deterministic sign. The _ex versions cannot b…
dgarske Jul 1, 2024
9ec29e9
Reduced duplicate code in deterministic test.
dgarske Jul 1, 2024
4335dac
Add `wc_ecc_set_deterministic_ex` to support custom hash type for det…
dgarske Jul 3, 2024
f91d0a2
Remove hash type check not required for ECDSA deterministic k. Fix `_…
dgarske Jul 4, 2024
96af77d
Hash Type selection changes to `ecc.c`.
Jul 16, 2024
237df2c
Hash Type selection changes to `ecc.c`.
Jul 16, 2024
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58 changes: 43 additions & 15 deletions wolfcrypt/src/ecc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6837,13 +6837,17 @@ static int deterministic_sign_helper(const byte* in, word32 inlen, ecc_key* key)
if (key->sign_k == NULL) {
key->sign_k = (mp_int*)XMALLOC(sizeof(mp_int), key->heap,
DYNAMIC_TYPE_ECC);
if (key->sign_k != NULL) {
err = mp_init(key->sign_k);
if (err != MP_OKAY) {
XFREE(key->sign_k, key->heap, DYNAMIC_TYPE_ECC);
key->sign_k = NULL;
}
}
}

if (key->sign_k != NULL) {
/* currently limiting to SHA256 for auto create */
if (mp_init(key->sign_k) != MP_OKAY ||
wc_ecc_gen_deterministic_k(in, inlen,
WC_HASH_TYPE_SHA256, ecc_get_k(key), key->sign_k,
if (wc_ecc_gen_deterministic_k(in, inlen,
key->hashType, ecc_get_k(key), key->sign_k,
curve->order, key->heap) != 0) {
mp_free(key->sign_k);
XFREE(key->sign_k, key->heap, DYNAMIC_TYPE_ECC);
Expand All @@ -6861,8 +6865,7 @@ static int deterministic_sign_helper(const byte* in, word32 inlen, ecc_key* key)
}
#else
key->sign_k_set = 0;
/* currently limiting to SHA256 for auto create */
if (wc_ecc_gen_deterministic_k(in, inlen, WC_HASH_TYPE_SHA256,
if (wc_ecc_gen_deterministic_k(in, inlen, key->hashType,
ecc_get_k(key), key->sign_k, curve->order, key->heap) != 0) {
err = ECC_PRIV_KEY_E;
}
Expand Down Expand Up @@ -7479,7 +7482,7 @@ static int _HMAC_K(byte* K, word32 KSz, byte* V, word32 VSz,
Hmac hmac;
int ret, init;

ret = init = wc_HmacInit(&hmac, heap, 0);
ret = init = wc_HmacInit(&hmac, heap, INVALID_DEVID);
if (ret == 0)
ret = wc_HmacSetKey(&hmac, hashType, K, KSz);

Expand Down Expand Up @@ -7519,7 +7522,7 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
enum wc_HashType hashType, mp_int* priv, mp_int* k, mp_int* order,
void* heap)
{
int ret = 0, qbits = 0;
int ret = 0;
#ifndef WOLFSSL_SMALL_STACK
byte h1[MAX_ECC_BYTES];
byte V[WC_MAX_DIGEST_SIZE];
Expand All @@ -7535,6 +7538,7 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
#endif
word32 xSz, VSz, KSz, h1len, qLen;
byte intOct;
word32 qbits = 0;

if (hash == NULL || k == NULL || order == NULL) {
return BAD_FUNC_ARG;
Expand All @@ -7545,9 +7549,20 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
return BAD_FUNC_ARG;
}

if (hashSz != WC_SHA256_DIGEST_SIZE) {
WOLFSSL_MSG("Currently only SHA256 digest is supported");
return BAD_FUNC_ARG;
/* if none is provided then detect has type based on hash size */
if (hashType == WC_HASH_TYPE_NONE) {
if (hashSz == 64) {
hashType = WC_HASH_TYPE_SHA512;
}
else if (hashSz == 48) {
hashType = WC_HASH_TYPE_SHA384;
}
else if (hashSz ==32) {
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hashType = WC_HASH_TYPE_SHA256;
}
else {
return BAD_FUNC_ARG;
}
}

if (mp_unsigned_bin_size(priv) > MAX_ECC_BYTES) {
Expand Down Expand Up @@ -7615,6 +7630,12 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
wc_MemZero_Add("wc_ecc_gen_deterministic_k x", x, qLen);
#endif
qbits = mp_count_bits(order);

/* hash truncate if too long */
if (((WOLFSSL_BIT_SIZE) * hashSz) > qbits) {
/* calculate truncated hash size using bits rounded up byte */
hashSz = (qbits + ((WOLFSSL_BIT_SIZE) - 1)) / (WOLFSSL_BIT_SIZE);
}
ret = mp_read_unsigned_bin(z1, hash, hashSz);
}

Expand All @@ -7636,7 +7657,7 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
ret = BUFFER_E;
}
else {
ret = mp_to_unsigned_bin_len(z1, h1, h1len);
ret = mp_to_unsigned_bin_len(z1, h1, (int)h1len);
}
}
else
Expand Down Expand Up @@ -7705,7 +7726,7 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
ret = mp_read_unsigned_bin(k, x, xSz);
}

if ((ret == 0) && ((int)(xSz * WOLFSSL_BIT_SIZE) != qbits)) {
if ((ret == 0) && ((xSz * WOLFSSL_BIT_SIZE) != qbits)) {
/* handle odd case where shift of 'k' is needed with RFC 6979
* k = bits2int(T) in section 3.2 h.3 */
mp_rshb(k, ((int)xSz * WOLFSSL_BIT_SIZE) - qbits);
Expand Down Expand Up @@ -7758,15 +7779,22 @@ int wc_ecc_gen_deterministic_k(const byte* hash, word32 hashSz,
/* Sets the deterministic flag for 'k' generation with sign.
* returns 0 on success
*/
int wc_ecc_set_deterministic(ecc_key* key, byte flag)
int wc_ecc_set_deterministic_ex(ecc_key* key, byte flag, int hashType)
{
if (key == NULL) {
return BAD_FUNC_ARG;
}

key->deterministic = flag ? 1 : 0;
key->hashType = hashType;
return 0;
}

int wc_ecc_set_deterministic(ecc_key* key, byte flag)
{
return wc_ecc_set_deterministic_ex(key, flag, WC_HASH_TYPE_NONE);
}

#endif /* end sign_ex and deterministic sign */


Expand Down
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