73 lines
2.3 KiB
C#
73 lines
2.3 KiB
C#
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#if !UNITY_WSA || UNITY_EDITOR
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using System.Security.Cryptography;
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#else
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using Windows.Security.Cryptography;
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using Windows.Security.Cryptography.Core;
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#endif
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using System;
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namespace XLua
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{
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public class SignatureLoader
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{
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private LuaEnv.CustomLoader userLoader;
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#if !UNITY_WSA || UNITY_EDITOR
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RSACryptoServiceProvider rsa;
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SHA1 sha;
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#else
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AsymmetricKeyAlgorithmProvider rsa;
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CryptographicKey key;
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#endif
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public SignatureLoader(string publicKey, LuaEnv.CustomLoader loader)
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{
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#if !UNITY_WSA || UNITY_EDITOR
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rsa = new RSACryptoServiceProvider();
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rsa.ImportCspBlob(Convert.FromBase64String(publicKey));
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sha = new SHA1CryptoServiceProvider();
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#else
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rsa = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaSignPkcs1Sha1);
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key = rsa.ImportPublicKey(CryptographicBuffer.DecodeFromBase64String(publicKey), CryptographicPublicKeyBlobType.Capi1PublicKey);
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#endif
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userLoader = loader;
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}
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byte[] load_and_verify(ref string filepath)
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{
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byte[] data = userLoader(ref filepath);
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if (data == null)
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{
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return null;
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}
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if (data.Length < 128)
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{
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throw new InvalidProgramException(filepath + " length less than 128!");
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}
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byte[] sig = new byte[128];
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byte[] filecontent = new byte[data.Length - 128];
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Array.Copy(data, sig, 128);
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Array.Copy(data, 128, filecontent, 0, filecontent.Length);
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#if !UNITY_WSA || UNITY_EDITOR
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if (!rsa.VerifyData(filecontent, sha, sig))
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{
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throw new InvalidProgramException(filepath + " has invalid signature!");
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}
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#else
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if (!CryptographicEngine.VerifySignature(key, CryptographicBuffer.CreateFromByteArray(filecontent), CryptographicBuffer.CreateFromByteArray(sig)))
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{
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throw new InvalidProgramException(filepath + " has invalid signature!");
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}
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#endif
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return filecontent;
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}
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public static implicit operator LuaEnv.CustomLoader(SignatureLoader signatureLoader)
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{
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return signatureLoader.load_and_verify;
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}
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}
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}
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