Small refactoring of SHA256 hashing

Author: peacekeeper

src/main/java/com/danubetech/keyformats/crypto/impl/secp256k1_ES256K_PrivateKeySigner.java

@@ -1,6 +1,7 @@
 package com.danubetech.keyformats.crypto.impl;
 
 import com.danubetech.keyformats.crypto.PrivateKeySigner;
+import com.danubetech.keyformats.crypto.provider.SHA256Provider;
 import com.danubetech.keyformats.jose.JWSAlgorithm;
 import org.bitcoinj.base.Sha256Hash;
 import org.bitcoinj.base.internal.ByteUtils;
@@ -18,13 +19,19 @@ public secp256k1_ES256K_PrivateKeySigner(ECKey privateKey) {
     @Override
     public byte[] sign(byte[] content) throws GeneralSecurityException {
 
-        ECKey.ECDSASignature ecdsaSignature = this.getPrivateKey().sign(Sha256Hash.of(content));
+        byte[] signatureBytes = new byte[64];
+
+        // sign
+
+        byte[] hash = SHA256Provider.get().sha256(content);
+        ECKey.ECDSASignature ecdsaSignature = this.getPrivateKey().sign(Sha256Hash.wrap(hash));
         byte[] r = ByteUtils.bigIntegerToBytes(ecdsaSignature.r, 32);
         byte[] s = ByteUtils.bigIntegerToBytes(ecdsaSignature.s, 32);
-
-        byte[] signatureBytes = new byte[64];
         System.arraycopy(r, 0, signatureBytes, 0, r.length);
         System.arraycopy(s, 0, signatureBytes, 32, s.length);
+
+        // done
+
         return signatureBytes;
     }
 }