1 files changed, 62 insertions, 0 deletions
diff --git a/libraries/spongycastle/pg/src/main/java/org/spongycastle/bcpg/MPInteger.java b/libraries/spongycastle/pg/src/main/java/org/spongycastle/bcpg/MPInteger.java
new file mode 100644
index 000000000..05abda374
--- /dev/null
+++ b/libraries/spongycastle/pg/src/main/java/org/spongycastle/bcpg/MPInteger.java
@@ -0,0 +1,62 @@
+package org.spongycastle.bcpg;
+
+import java.io.*;
+import java.math.BigInteger;
+
+/**
+ * a multiple precision integer
+ */
+public class MPInteger 
+    extends BCPGObject
+{
+    BigInteger    value = null;
+    
+    public MPInteger(
+        BCPGInputStream    in)
+        throws IOException
+    {
+        int       length = (in.read() << 8) | in.read();
+        byte[]    bytes = new byte[(length + 7) / 8];
+        
+        in.readFully(bytes);
+        
+        value = new BigInteger(1, bytes);
+    }
+    
+    public MPInteger(
+        BigInteger    value)
+    {
+        if (value == null || value.signum() < 0)
+        {
+            throw new IllegalArgumentException("value must not be null, or negative");
+        }
+
+        this.value = value;
+    }
+    
+    public BigInteger getValue()
+    {
+        return value;
+    }
+    
+    public void encode(
+        BCPGOutputStream    out)
+        throws IOException
+    {
+        int length = value.bitLength();
+        
+        out.write(length >> 8);
+        out.write(length);
+        
+        byte[]    bytes = value.toByteArray();
+        
+        if (bytes[0] == 0)
+        {
+            out.write(bytes, 1, bytes.length - 1);
+        }
+        else
+        {
+            out.write(bytes, 0, bytes.length);
+        }
+    }
+}