1 files changed, 154 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/util/encoders/Base64.java b/core/src/main/java/org/spongycastle/util/encoders/Base64.java
new file mode 100644
index 00000000..a2b5aff8
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/util/encoders/Base64.java
@@ -0,0 +1,154 @@
+package org.spongycastle.util.encoders;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.spongycastle.util.Strings;
+
+/**
+ * Utility class for converting Base64 data to bytes and back again.
+ */
+public class Base64
+{
+    private static final Encoder encoder = new Base64Encoder();
+    
+    public static String toBase64String(
+        byte[] data)
+    {
+        return toBase64String(data, 0, data.length);
+    }
+
+    public static String toBase64String(
+        byte[] data,
+        int    off,
+        int    length)
+    {
+        byte[] encoded = encode(data, off, length);
+        return Strings.fromByteArray(encoded);
+    }
+
+    /**
+     * encode the input data producing a base 64 encoded byte array.
+     *
+     * @return a byte array containing the base 64 encoded data.
+     */
+    public static byte[] encode(
+        byte[]    data)
+    {
+        return encode(data, 0, data.length);
+    }
+
+    /**
+     * encode the input data producing a base 64 encoded byte array.
+     *
+     * @return a byte array containing the base 64 encoded data.
+     */
+    public static byte[] encode(
+        byte[] data,
+        int    off,
+        int    length)
+    {
+        int len = (length + 2) / 3 * 4;
+        ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
+
+        try
+        {
+            encoder.encode(data, off, length, bOut);
+        }
+        catch (Exception e)
+        {
+            throw new EncoderException("exception encoding base64 string: " + e.getMessage(), e);
+        }
+        
+        return bOut.toByteArray();
+    }
+
+    /**
+     * Encode the byte data to base 64 writing it to the given output stream.
+     *
+     * @return the number of bytes produced.
+     */
+    public static int encode(
+        byte[]                data,
+        OutputStream    out)
+        throws IOException
+    {
+        return encoder.encode(data, 0, data.length, out);
+    }
+    
+    /**
+     * Encode the byte data to base 64 writing it to the given output stream.
+     *
+     * @return the number of bytes produced.
+     */
+    public static int encode(
+        byte[]                data,
+        int                    off,
+        int                    length,
+        OutputStream    out)
+        throws IOException
+    {
+        return encoder.encode(data, off, length, out);
+    }
+    
+    /**
+     * decode the base 64 encoded input data. It is assumed the input data is valid.
+     *
+     * @return a byte array representing the decoded data.
+     */
+    public static byte[] decode(
+        byte[]    data)
+    {
+        int len = data.length / 4 * 3;
+        ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
+        
+        try
+        {
+            encoder.decode(data, 0, data.length, bOut);
+        }
+        catch (Exception e)
+        {
+            throw new DecoderException("unable to decode base64 data: " + e.getMessage(), e);
+        }
+        
+        return bOut.toByteArray();
+    }
+    
+    /**
+     * decode the base 64 encoded String data - whitespace will be ignored.
+     *
+     * @return a byte array representing the decoded data.
+     */
+    public static byte[] decode(
+        String    data)
+    {
+        int len = data.length() / 4 * 3;
+        ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
+        
+        try
+        {
+            encoder.decode(data, bOut);
+        }
+        catch (Exception e)
+        {
+            throw new DecoderException("unable to decode base64 string: " + e.getMessage(), e);
+        }
+        
+        return bOut.toByteArray();
+    }
+    
+    /**
+     * decode the base 64 encoded String data writing it to the given output stream,
+     * whitespace characters will be ignored.
+     *
+     * @return the number of bytes produced.
+     */
+    public static int decode(
+        String                data,
+        OutputStream    out)
+        throws IOException
+    {
+        return encoder.decode(data, out);
+    }
+}