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Like the public key, zero pad the front of the private key.

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This commit is contained in:
John Safranek
2021-10-17 14:23:22 -07:00
committed by Daniel Pouzzner
parent bc91187063
commit f2c4567164
1 changed files with 13 additions and 3 deletions
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16
src/tls.c
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@ -6081,7 +6081,7 @@ static int TLSX_KeyShare_GenDhKey(WOLFSSL *ssl, KeyShareEntry* kse)
{
int ret = 0;
#if !defined(NO_DH) && (!defined(NO_CERTS) || !defined(NO_PSK))
word32 pSz = 0;
word32 pSz = 0, pvtSz = 0;
DhKey* dhKey = (DhKey*)kse->key;
/* Pick the parameters from the named group. */
@ -6124,6 +6124,7 @@ static int TLSX_KeyShare_GenDhKey(WOLFSSL *ssl, KeyShareEntry* kse)
if (params == NULL)
return BAD_FUNC_ARG;
pSz = params->p_len;
pvtSz = kse->keyLen;
#else
kse->keyLen = wc_DhGetNamedKeyMinSize(kse->group);
if (kse->keyLen == 0) {
@ -6133,6 +6134,7 @@ static int TLSX_KeyShare_GenDhKey(WOLFSSL *ssl, KeyShareEntry* kse)
if (ret != 0) {
return BAD_FUNC_ARG;
}
pvtSz = kse->keyLen;
#endif
kse->pubKeyLen = pSz;
@ -6178,7 +6180,8 @@ static int TLSX_KeyShare_GenDhKey(WOLFSSL *ssl, KeyShareEntry* kse)
DerBuffer* keyDer = ssl->staticKE.dhKey;
word32 idx = 0;
WOLFSSL_MSG("Using static DH key");
ret = wc_DhKeyDecode(keyDer->buffer, &idx, dhKey, keyDer->length);
ret = wc_DhKeyDecode(keyDer->buffer, &idx,
dhKey, keyDer->length);
if (ret == 0) {
ret = wc_DhExportKeyPair(dhKey,
(byte*)kse->privKey, &kse->keyLen, /* private */
@ -6212,9 +6215,16 @@ static int TLSX_KeyShare_GenDhKey(WOLFSSL *ssl, KeyShareEntry* kse)
XMEMMOVE(kse->pubKey + pSz - kse->pubKeyLen, kse->pubKey,
kse->pubKeyLen);
XMEMSET(kse->pubKey, 0, pSz - kse->pubKeyLen);
kse->pubKeyLen = pSz;
}
kse->pubKeyLen = pSz;
if (pvtSz != kse->keyLen) {
/* Zero pad the front of the private key */
XMEMMOVE(kse->privKey + pvtSz - kse->keyLen, kse->privKey,
kse->keyLen);
XMEMSET(kse->privKey, 0, pvtSz - kse->keyLen);
kse->keyLen = pvtSz;
}
#ifdef WOLFSSL_DEBUG_TLS
WOLFSSL_MSG("Public DH Key");