Update multibase, and support identity hash.

Author: ianopolous

Diff for: lib/multibase.jar

@@ -34,7 +34,7 @@
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<version.junit>4.12</version.junit>
         <version.hamcrest>1.3</version.hamcrest>
-        <version.multibase>v1.0.0</version.multibase>
+        <version.multibase>v1.0.1</version.multibase>
 	</properties>
 
 	<repositories>

Diff for: pom.xml

@@ -13,6 +13,7 @@
 
 public class Multihash {
     public enum Type {
+        id(0, -1),
         md5(0xd5, 16),
         sha1(0x11, 20),
         sha2_256(0x12, 32),
@@ -54,8 +55,10 @@ public static Type lookup(int t) {
     public Multihash(final Type type, final byte[] hash) {
         if (hash.length > 127)
             throw new IllegalStateException("Unsupported hash size: "+hash.length);
-        if (hash.length != type.length)
+        if (hash.length != type.length && type != Type.id)
             throw new IllegalStateException("Incorrect hash length: " + hash.length + " != "+type.length);
+        if (type == Type.id && hash.length > 64)
+            throw new IllegalStateException("Unsupported size for identity hash! "+ hash.length);
         this.type = type;
         this.hash = hash;
     }

Diff for: src/main/java/io/ipfs/multihash/Multihash.java

@@ -25,6 +25,8 @@ public void base58Test() {
     @Test
     public void multihashTest() {
         Object[][] examples = new Object[][]{
+            {Multihash.Type.id, "ID", "13hC12xCn", "hello"},
+            {Multihash.Type.id, "ID", "11", ""},
             {Multihash.Type.md5, "MD5", "9qZY4e2uauH3bG83FdaPSaPzA", "hello world"},
             {Multihash.Type.sha1, "SHA-1", "5drNu81uhrFLRiS4bxWgAkpydaLUPW", "hello world"},
             {Multihash.Type.sha2_256, "SHA-256", "QmaozNR7DZHQK1ZcU9p7QdrshMvXqWK6gpu5rmrkPdT3L4", "hello world"},
@@ -36,10 +38,14 @@ public void multihashTest() {
         for(Object[] ex: examples) {
             Multihash m = Multihash.fromBase58((String)ex[2]);
             try {
-                MessageDigest md = MessageDigest.getInstance((String) ex[1]);
-                assertNotNull(md );
-                md.update(((String) ex[3]).getBytes("UTF-8"));
-                byte[] digest = md.digest();
+                byte[] digest;
+                if (ex[0] != Multihash.Type.id) {
+                    MessageDigest md = MessageDigest.getInstance((String) ex[1]);
+                    assertNotNull(md);
+                    md.update(((String) ex[3]).getBytes("UTF-8"));
+                    digest = md.digest();
+                } else
+                    digest = ((String) ex[3]).getBytes("UTF-8");
                 // Test constructor
                 Multihash m2 = new Multihash((Multihash.Type)ex[0], digest);
                 // Test comparison