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In DoServerKeyExchange(), when reading the DH key from the server, the

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client was checking it too strictly. The pubkey value should be checked
as strictly as the generator, for too large. The public key value is
checked mathematically elsewhere.
This commit is contained in:
John Safranek
2020-10-21 21:47:32 -07:00
parent d2dac8e4b8
commit e28303b40a
1 changed files with 0 additions and 11 deletions
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11
src/internal.c
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@@ -21330,17 +21330,6 @@ static int GetDhPublicKey(WOLFSSL* ssl, const byte* input, word32 size,
ERROR_OUT(BUFFER_ERROR, exit_gdpk);
}
if (length < ssl->options.minDhKeySz) {
WOLFSSL_MSG("Server using a public DH key that is too small");
SendAlert(ssl, alert_fatal, handshake_failure);
XFREE(ssl->buffers.serverDH_P.buffer, ssl->heap,
DYNAMIC_TYPE_PUBLIC_KEY);
ssl->buffers.serverDH_P.buffer = NULL;
XFREE(ssl->buffers.serverDH_G.buffer, ssl->heap,
DYNAMIC_TYPE_PUBLIC_KEY);
ssl->buffers.serverDH_G.buffer = NULL;
ERROR_OUT(DH_KEY_SIZE_E, exit_gdpk);
}
if (length > ssl->options.maxDhKeySz) {
WOLFSSL_MSG("Server using a public DH key that is too big");
SendAlert(ssl, alert_fatal, handshake_failure);