/// <summary> /// Create a blinded commitment of messages for use in producing a blinded BBS+ signature /// </summary> /// <param name="request">Request for producing the blinded commitment</param> /// <returns></returns> public BlindedCommitment CreateBlindedCommitment(CreateBlindedCommitmentRequest request) { using var context = new UnmanagedMemoryContext(); var handle = NativeMethods.bbs_blind_commitment_context_init(out var error); context.ThrowOnError(error); foreach (var item in request.Messages) { NativeMethods.bbs_blind_commitment_context_add_message_string(handle, item.Index, item.Message, out error); context.ThrowOnError(error); } NativeMethods.bbs_blind_commitment_context_set_nonce_string(handle, request.Nonce, out error); context.ThrowOnError(error); NativeMethods.bbs_blind_commitment_context_set_public_key(handle, context.ToBuffer(request.PublicKey), out error); context.ThrowOnError(error); NativeMethods.bbs_blind_commitment_context_finish(handle, out var commitment, out var outContext, out var blindingFactor, out error); context.ThrowOnError(error); return(new BlindedCommitment(context.ToByteArray(outContext), context.ToByteArray(blindingFactor), context.ToByteArray(commitment))); }
/// <summary> /// Creates new <see cref="BlsKeyPair"/> using a input seed as byte array. /// </summary> /// <param name="seed">The seed.</param> /// <returns></returns> public BlsKeyPair GenerateBlsKey(byte[] seed) { using var context = new UnmanagedMemoryContext(); var result = NativeMethods.bls_generate_key(context.ToBuffer(seed), out var publicKey, out var secretKey, out var error); context.ThrowOnError(error); return(new BlsKeyPair(context.ToByteArray(secretKey), context.ToByteArray(publicKey))); }
/// <summary> /// Creates the proof asynchronous. /// </summary> /// <param name="myKey">My key.</param> /// <param name="nonce">The nonce.</param> /// <param name="messages">The messages.</param> /// <returns></returns> public byte[] CreateProof(CreateProofRequest proofRequest) { using var context = new UnmanagedMemoryContext(); var handle = NativeMethods.bbs_create_proof_context_init(out var error); context.ThrowOnError(error); foreach (var message in proofRequest.Messages) { NativeMethods.bbs_create_proof_context_add_proof_message_string(handle, message.Message, message.ProofType, context.ToBuffer(proofRequest.BlindingFactor ?? Array.Empty <byte>()), out error); context.ThrowOnError(error); } NativeMethods.bbs_create_proof_context_set_nonce_string(handle, proofRequest.Nonce, out error); context.ThrowOnError(error); NativeMethods.bbs_create_proof_context_set_public_key(handle, context.ToBuffer(proofRequest.PublicKey), out error); context.ThrowOnError(error); NativeMethods.bbs_create_proof_context_set_signature(handle, context.ToBuffer(proofRequest.Signature), out error); context.ThrowOnError(error); NativeMethods.bbs_create_proof_context_finish(handle, out var proof, out error); context.ThrowOnError(error); return(context.ToByteArray(proof)); }
/// <summary> /// Signs a set of messages featuring both known and blinded messages to the signer and produces a BBS+ signature /// </summary> /// <param name="keyPair">The signing key containing the secret BLS key.</param> /// <param name="commitment">The commitment.</param> /// <param name="messages">The messages.</param> /// <returns></returns> public byte[] BlindSign(BlindSignRequest request) { using var context = new UnmanagedMemoryContext(); var handle = NativeMethods.bbs_blind_sign_context_init(out var error); context.ThrowOnError(error); foreach (var item in request.Messages) { NativeMethods.bbs_blind_sign_context_add_message_string(handle, item.Index, item.Message, out error); context.ThrowOnError(error); } NativeMethods.bbs_blind_sign_context_set_public_key(handle, context.ToBuffer(request.PublicKey), out error); context.ThrowOnError(error); NativeMethods.bbs_blind_sign_context_set_secret_key(handle, context.ToBuffer(request.SecretKey.SecretKey.ToArray()), out error); context.ThrowOnError(error); NativeMethods.bbs_blind_sign_context_set_commitment(handle, context.ToBuffer(request.Commitment), out error); context.ThrowOnError(error); NativeMethods.bbs_blind_sign_context_finish(handle, out var blindedSignature, out error); context.ThrowOnError(error); return(context.ToByteArray(blindedSignature)); }
/// <summary> /// Unblinds the signature asynchronous. /// </summary> /// <param name="request">Unbling signature request</param> /// <returns></returns> public byte[] UnblindSignature(UnblindSignatureRequest request) { using var context = new UnmanagedMemoryContext(); NativeMethods.bbs_unblind_signature(context.ToBuffer(request.BlindedSignature), context.ToBuffer(request.BlindingFactor), out var unblindedSignature, out var error); context.ThrowOnError(error); return(context.ToByteArray(unblindedSignature)); }
/// <summary> /// Generates new BBS+ public key from the current BLS12-381 /// </summary> /// <param name="messageCount">The message count.</param> /// <returns></returns> public BbsKeyPair GeyBbsKeyPair(uint messageCount) { using var context = new UnmanagedMemoryContext(); if (SecretKey is null) { NativeMethods.bls_public_key_to_bbs_key(context.ToBuffer(PublicKey), messageCount, out var publicKey, out var error); context.ThrowOnError(error); return(new BbsKeyPair(context.ToByteArray(publicKey), messageCount)); } else { NativeMethods.bls_secret_key_to_bbs_key(context.ToBuffer(SecretKey), messageCount, out var publicKey, out var error); context.ThrowOnError(error); return(new BbsKeyPair(context.ToByteArray(publicKey), messageCount)); } }
/// <summary> /// Signs a set of messages with a BBS key pair and produces a BBS signature /// </summary> /// <param name="signRequest">Request for the sign operation</param> /// <returns>The raw signature value</returns> /// <exception cref="BbsException"> /// Secret key not found /// or /// Messages cannot be null /// </exception> public byte[] Sign(SignRequest signRequest) { if (signRequest?.KeyPair?.SecretKey is null) { throw new BbsException("Secret key not found"); } if (signRequest?.Messages is null) { throw new BbsException("Messages cannot be null"); } var bbsKeyPair = signRequest.KeyPair.GeyBbsKeyPair((uint)signRequest.Messages.Length); using var context = new UnmanagedMemoryContext(); var handle = NativeMethods.bbs_sign_context_init(out var error); context.ThrowOnError(error); foreach (var message in signRequest.Messages) { NativeMethods.bbs_sign_context_add_message_string(handle, message, out error); context.ThrowOnError(error); } NativeMethods.bbs_sign_context_set_public_key(handle, context.ToBuffer(bbsKeyPair.PublicKey), out error); context.ThrowOnError(error); NativeMethods.bbs_sign_context_set_secret_key(handle, context.ToBuffer(signRequest.KeyPair.SecretKey !), out error); context.ThrowOnError(error); NativeMethods.bbs_sign_context_finish(handle, out var signature, out error); context.ThrowOnError(error); return(context.ToByteArray(signature)); }