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Fix Wii certificates

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patchzyy
2026-09-29 08:47:55 +02:00
parent a05c89739d
commit 3f4e3ee014
1 changed files with 3 additions and 2 deletions
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runtime/include/wii_es_crypto.h
+3 -2
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@@ -132,8 +132,9 @@ using CryptoEcdsa = CryptoPP::ECDSA<CryptoPP::EC2N, CryptoPP::SHA1>;
inline CryptoEcdsa::PrivateKey MakePrivateKey(const uint8_t* key) {
CryptoPP::DL_GroupParameters_EC<CryptoPP::EC2N> parameters(CryptoPP::ASN1::sect233r1());
const CryptoPP::Integer exponent(key, 30);
if (exponent <= CryptoPP::Integer::Zero() || exponent >= parameters.GetSubgroupOrder()) {
// Wii keys need not be canonical scalars; reduction preserves their public key.
const CryptoPP::Integer exponent = CryptoPP::Integer(key, 30) % parameters.GetSubgroupOrder();
if (exponent == CryptoPP::Integer::Zero()) {
throw std::invalid_argument("Wii ES private key is outside the sect233r1 subgroup");
}