fix : get right seed buf; btc from seed

Author: wyuinche

lib/.project

@@ -22,12 +22,12 @@
 	</natures>
 	<filteredResources>
 		<filter>
-			<id>1631078764120</id>
+			<id>1667273482097</id>
 			<name></name>
 			<type>30</type>
 			<matcher>
 				<id>org.eclipse.core.resources.regexFilterMatcher</id>
-				<arguments>node_modules|.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
 			</matcher>
 		</filter>
 	</filteredResources>

lib/src/main/java/com/wuin/ecdsakeyj/BTCKeyPair.java

@@ -38,7 +38,12 @@ private BTCKeyPair(String priv) {
     private BTCKeyPair(byte[] seed) {
         byte[] sh = Util.sha3(seed);
         byte[] shb = Base58.encode(sh).getBytes();
-        shb = Arrays.copyOfRange(shb, 0, shb.length - 4);
+
+        if (shb.length < 44) {
+            shb = Arrays.copyOfRange(shb, 0, shb.length - 3);
+        } else {
+            shb = Arrays.copyOfRange(shb, 0, shb.length - 4);
+        }
 
         BigInteger k = new BigInteger(shb);
         BigInteger n = new BigInteger("115792089237316195423570985008687907852837564279074904382605163141518161494336");