/// <summary>
/// ユーザ鍵を生成します。
/// </summary>
/// <returns></returns>
public static PeerKey GeneratePeerKey()
{
RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(PeerKeyBit);
PeerKey key = new PeerKey();
key.RSAParam = rsaProvider.ExportParameters(true);
key.Expire = DateTime.Now.AddHours(PeerKeyExpireHours); // TODO: HACK: PC時計に依存する
key.KeySignature = SignPeerKey(key);
return(key);
}
/// <summary>
/// ユーザ鍵の署名を生成します。
/// 引数のユーザ鍵インスタンスは書き換えません。
/// </summary>
/// <param name="key"></param>
/// <returns>署名</returns>
private static string SignPeerKey(PeerKey key)
{
// 署名用データ生成
byte[] expire = Encoding.ASCII.GetBytes(key.Expire.ToString("yyyy/MM/dd HH-mm-ss"));
byte[] publicKey = key.PublicKeyBytes;
byte[] signData = Enumerable.Concat(publicKey, expire).ToArray();
SHA1CryptoServiceProvider sha1Provider = new SHA1CryptoServiceProvider();
byte[] sha1SignData = sha1Provider.ComputeHash(signData);
// 署名生成
RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider();
rsaProvider.ImportParameters(KeyDefine.PeerVerificationKey);
RSAPKCS1SignatureFormatter pkcsFormatter = new RSAPKCS1SignatureFormatter(rsaProvider);
pkcsFormatter.SetHashAlgorithm("SHA1");
byte[] sign = pkcsFormatter.CreateSignature(sha1SignData);
return(Convert.ToBase64String(sign, Base64FormattingOptions.None));
}
