using Org.BouncyCastle.Utilities.IO; using System; using System.IO; namespace Org.BouncyCastle.Pqc.Crypto.Lms { public sealed class HssPublicKeyParameters : LmsKeyParameters, ILmsContextBasedVerifier { private readonly int m_level; private readonly LmsPublicKeyParameters m_lmsPublicKey; [Obsolete("Use 'Level' instead")] public int L { get { return m_level; } } public int Level => m_level; public LmsPublicKeyParameters LmsPublicKey => m_lmsPublicKey; public HssPublicKeyParameters(int l, LmsPublicKeyParameters lmsPublicKey) : base(false) { m_level = l; if (lmsPublicKey == null) throw new ArgumentNullException("lmsPublicKey"); m_lmsPublicKey = lmsPublicKey; } public static HssPublicKeyParameters GetInstance(object src) { HssPublicKeyParameters hssPublicKeyParameters = src as HssPublicKeyParameters; if (hssPublicKeyParameters != null) return hssPublicKeyParameters; BinaryReader binaryReader = src as BinaryReader; if (binaryReader != null) return Parse(binaryReader); Stream stream = src as Stream; if (stream != null) return BinaryReaders.Parse(Parse, stream, true); byte[] array = src as byte[]; if (array != null) return BinaryReaders.Parse(Parse, new MemoryStream(array, false), false); throw new ArgumentException($"""{src}"); } internal static HssPublicKeyParameters Parse(BinaryReader binaryReader) { int l = BinaryReaders.ReadInt32BigEndian(binaryReader); LmsPublicKeyParameters lmsPublicKey = LmsPublicKeyParameters.Parse(binaryReader); return new HssPublicKeyParameters(l, lmsPublicKey); } public override bool Equals(object o) { if (this == o) return true; HssPublicKeyParameters hssPublicKeyParameters = o as HssPublicKeyParameters; if (hssPublicKeyParameters != null && m_level == hssPublicKeyParameters.m_level) return m_lmsPublicKey.Equals(hssPublicKeyParameters.m_lmsPublicKey); return false; } public override int GetHashCode() { int level = m_level; return 31 * level + m_lmsPublicKey.GetHashCode(); } public override byte[] GetEncoded() { return Composer.Compose().U32Str(m_level).Bytes(m_lmsPublicKey.GetEncoded()) .Build(); } public LmsContext GenerateLmsContext(byte[] sigEnc) { HssSignature instance; try { instance = HssSignature.GetInstance(sigEnc, Level); } catch (IOException ex) { throw new Exception("cannot parse signature: " + ex.Message); } LmsSignedPubKey[] signedPubKeys = instance.SignedPubKeys; LmsPublicKeyParameters lmsPublicKeyParameters = LmsPublicKey; if (signedPubKeys.Length != 0) lmsPublicKeyParameters = signedPubKeys[signedPubKeys.Length - 1].PublicKey; return lmsPublicKeyParameters.GenerateOtsContext(instance.Signature).WithSignedPublicKeys(signedPubKeys); } public bool Verify(LmsContext context) { LmsSignedPubKey[] signedPubKeys = context.SignedPubKeys; if (signedPubKeys.Length != Level - 1) return false; LmsPublicKeyParameters lmsPublicKeyParameters = LmsPublicKey; bool flag = false; for (int i = 0; i < signedPubKeys.Length; i++) { LmsSignature signature = signedPubKeys[i].Signature; LmsPublicKeyParameters publicKey = signedPubKeys[i].PublicKey; if (!Lms.VerifySignature(lmsPublicKeyParameters, signature, publicKey.ToByteArray())) flag = true; lmsPublicKeyParameters = publicKey; } return !flag & lmsPublicKeyParameters.Verify(context); } } }