1 files changed, 52 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/crypto/io/SignerInputStream.java b/core/src/main/java/org/spongycastle/crypto/io/SignerInputStream.java
new file mode 100644
index 00000000..f7f6935f
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/crypto/io/SignerInputStream.java
@@ -0,0 +1,52 @@
+package org.spongycastle.crypto.io;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.spongycastle.crypto.Signer;
+
+public class SignerInputStream
+    extends FilterInputStream
+{
+    protected Signer signer;
+
+    public SignerInputStream(
+        InputStream stream,
+        Signer      signer)
+    {
+        super(stream);
+        this.signer = signer;
+    }
+
+    public int read()
+        throws IOException
+    {
+        int b = in.read();
+
+        if (b >= 0)
+        {
+            signer.update((byte)b);
+        }
+        return b;
+    }
+
+    public int read(
+        byte[] b,
+        int off,
+        int len)
+        throws IOException
+    {
+        int n = in.read(b, off, len);
+        if (n > 0)
+        {
+            signer.update(b, off, n);
+        }
+        return n;
+    }
+
+    public Signer getSigner()
+    {
+        return signer;
+    }
+}