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EncodeMessage y DecodeMessage functions implemented in Memo

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Henry Varona 2016-12-05 21:34:21 -04:00 committed by Nelson R. Perez
parent 9d19607899
commit 51da6a5761
1 changed files with 29 additions and 4 deletions
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33
src/main/java/com/luminiasoft/bitshares/Memo.java
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@ -39,11 +39,11 @@ public class Memo implements ByteSerializable {
this.message = null; this.message = null;
} }
public Memo(byte[] private_key, byte[] public_key, byte[] msg){ public void encodeMessage(byte[] private_key, byte[] public_key, byte[] msg){
this(private_key,public_key,msg,0); this.encodeMessage(private_key,public_key,msg,0);
} }
public Memo(byte[] private_key, byte[] public_key, byte[] msg, long custom_nonce){ public void encodeMessage(byte[] private_key, byte[] public_key, byte[] msg, long custom_nonce){
try { try {
MessageDigest md = MessageDigest.getInstance("SHA-256"); MessageDigest md = MessageDigest.getInstance("SHA-256");
ECKey privateECKey = ECKey.fromPrivate(md.digest(private_key)); ECKey privateECKey = ECKey.fromPrivate(md.digest(private_key));
@ -73,7 +73,10 @@ public class Memo implements ByteSerializable {
byte[] secret = privateECKey.getPubKeyPoint().multiply(ECKey.fromPublicOnly(md.digest(public_key)).getPrivKey()).normalize().getXCoord().getEncoded(); byte[] secret = privateECKey.getPubKeyPoint().multiply(ECKey.fromPublicOnly(md.digest(public_key)).getPrivKey()).normalize().getXCoord().getEncoded();
byte[] finalKey = new byte[secret.length + this.nonce.length]; byte[] finalKey = new byte[secret.length + this.nonce.length];
System.arraycopy(secret, 0, finalKey, 0, secret.length);
System.arraycopy(this.nonce, 0, finalKey, secret.length, this.nonce.length);
byte[] sha256Msg = md.digest(msg); byte[] sha256Msg = md.digest(msg);
byte[] serialChecksum = new byte[4]; byte[] serialChecksum = new byte[4];
System.arraycopy(sha256Msg, 0, serialChecksum, 0, 4); System.arraycopy(sha256Msg, 0, serialChecksum, 0, 4);
@ -86,4 +89,26 @@ public class Memo implements ByteSerializable {
} }
} }
public void decodeMessage(byte[] private_key, byte[] public_key, byte[] msg, byte[] nonce){
try {
MessageDigest md = MessageDigest.getInstance("SHA-256");
ECKey privateECKey = ECKey.fromPrivate(md.digest(private_key));
this.to = privateECKey.getPubKey();
this.from = public_key;
this.nonce = nonce;
byte[] secret = privateECKey.getPubKeyPoint().multiply(ECKey.fromPublicOnly(md.digest(public_key)).getPrivKey()).normalize().getXCoord().getEncoded();
byte[] finalKey = new byte[secret.length + this.nonce.length];
System.arraycopy(secret, 0, finalKey, 0, secret.length);
System.arraycopy(this.nonce, 0, finalKey, secret.length, this.nonce.length);
byte[] msgFinal = Util.decryptAES(msg, finalKey);
byte[] decodedMsg = new byte[msgFinal.length-4];
System.arraycopy(msgFinal, 4, decodedMsg, 0, decodedMsg.length);
this.message = decodedMsg;
} catch (NoSuchAlgorithmException ex){
}
}
} }