1 files changed, 81 insertions, 0 deletions
diff --git a/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/SHA1PGPDigestCalculator.java b/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/SHA1PGPDigestCalculator.java
new file mode 100644
index 00000000..424770e6
--- /dev/null
+++ b/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/SHA1PGPDigestCalculator.java
@@ -0,0 +1,81 @@
+package org.spongycastle.openpgp.operator.jcajce;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import org.spongycastle.bcpg.HashAlgorithmTags;
+import org.spongycastle.openpgp.operator.PGPDigestCalculator;
+
+class SHA1PGPDigestCalculator
+    implements PGPDigestCalculator
+{
+    private MessageDigest digest;
+
+    SHA1PGPDigestCalculator()
+    {
+        try
+        {
+            digest = MessageDigest.getInstance("SHA1");
+        }
+        catch (NoSuchAlgorithmException e)
+        {
+            throw new IllegalStateException("cannot find SHA-1: " + e.getMessage());
+        }
+    }
+
+    public int getAlgorithm()
+    {
+        return HashAlgorithmTags.SHA1;
+    }
+
+    public OutputStream getOutputStream()
+    {
+        return new DigestOutputStream(digest);
+    }
+
+    public byte[] getDigest()
+    {
+        return digest.digest();
+    }
+
+    public void reset()
+    {
+        digest.reset();
+    }
+
+    private class DigestOutputStream
+        extends OutputStream
+    {
+        private MessageDigest dig;
+
+        DigestOutputStream(MessageDigest dig)
+        {
+            this.dig = dig;
+        }
+
+        public void write(byte[] bytes, int off, int len)
+            throws IOException
+        {
+            dig.update(bytes, off, len);
+        }
+
+        public void write(byte[] bytes)
+            throws IOException
+        {
+            dig.update(bytes);
+        }
+
+        public void write(int b)
+            throws IOException
+        {
+            dig.update((byte)b);
+        }
+
+        byte[] getDigest()
+        {
+            return dig.digest();
+        }
+    }
+}