support EdDSA for blinding

libi2pd/Blinding.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2021, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -277,6 +277,14 @@ namespace data
 				i2p::crypto::GetEd25519 ()->BlindPrivateKey (priv, seed, blindedPriv, blindedPub);
 				publicKeyLength = i2p::crypto::EDDSA25519_PUBLIC_KEY_LENGTH;
 			break;
+			case i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:	
+			{
+				uint8_t exp[64];	
+				i2p::crypto::Ed25519::ExpandPrivateKey (priv, exp);	
+				i2p::crypto::GetEd25519 ()->BlindPrivateKey (exp, seed, blindedPriv, blindedPub);
+				publicKeyLength = i2p::crypto::EDDSA25519_PUBLIC_KEY_LENGTH;	
+				break;
+			}		
 			default:
 				LogPrint (eLogError, "Blinding: can't blind signature type ", (int)m_SigType);
 		}