/// <summary>
/// 文件加密
/// </summary>
/// <param name="pubKey">椭圆曲线公钥</param>
/// <param name="filePath">文件路径</param>
/// <returns>文件加密后的文件名</returns>
public string EncryptFile(ECPublicKeyParameters pubKey, string filePath)
{
byte[] cleartext = File.ReadAllBytes(filePath);
AsymmetricCipherKeyPair Rand = KeyUtils.GenerateKeyPair();
byte[] ciphertext = engine.Encrypt(
(ECPublicKeyParameters)pubKey,
(ECPrivateKeyParameters)Rand.Private,
cleartext
);
using (FileStream fs = File.OpenWrite(filePath))
{
byte[] hexPubKey = KeyUtils.EncodeECPublicKey((ECPublicKeyParameters)Rand.Public);
Debug.Assert(
hexPubKey.Length == 33,
"Encoded EC public key must be in hex compressed format"
);
fs.Write(hexPubKey, 0, hexPubKey.Length);
fs.Write(ciphertext, 0, ciphertext.Length);
}
string lockedPath = filePath + lockSuffix;
File.Move(filePath, lockedPath);
return(lockedPath);
}