1 files changed, 75 insertions, 0 deletions
diff --git a/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/bc/BcPGPContentVerifierBuilderProvider.java b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/bc/BcPGPContentVerifierBuilderProvider.java
new file mode 100644
index 000000000..a2cfbf911
--- /dev/null
+++ b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/bc/BcPGPContentVerifierBuilderProvider.java
@@ -0,0 +1,75 @@
+package org.spongycastle.openpgp.operator.bc;
+
+import java.io.OutputStream;
+
+import org.spongycastle.crypto.Signer;
+import org.spongycastle.openpgp.PGPException;
+import org.spongycastle.openpgp.PGPPublicKey;
+import org.spongycastle.openpgp.operator.PGPContentVerifier;
+import org.spongycastle.openpgp.operator.PGPContentVerifierBuilder;
+import org.spongycastle.openpgp.operator.PGPContentVerifierBuilderProvider;
+
+public class BcPGPContentVerifierBuilderProvider
+    implements PGPContentVerifierBuilderProvider
+{
+    private BcPGPKeyConverter keyConverter = new BcPGPKeyConverter();
+
+    public BcPGPContentVerifierBuilderProvider()
+    {
+    }
+
+    public PGPContentVerifierBuilder get(int keyAlgorithm, int hashAlgorithm)
+        throws PGPException
+    {
+        return new BcPGPContentVerifierBuilder(keyAlgorithm, hashAlgorithm);
+    }
+
+    private class BcPGPContentVerifierBuilder
+        implements PGPContentVerifierBuilder
+    {
+        private int hashAlgorithm;
+        private int keyAlgorithm;
+
+        public BcPGPContentVerifierBuilder(int keyAlgorithm, int hashAlgorithm)
+        {
+            this.keyAlgorithm = keyAlgorithm;
+            this.hashAlgorithm = hashAlgorithm;
+        }
+
+        public PGPContentVerifier build(final PGPPublicKey publicKey)
+            throws PGPException
+        {
+            final Signer signer = BcImplProvider.createSigner(keyAlgorithm, hashAlgorithm);
+
+            signer.init(false, keyConverter.getPublicKey(publicKey));
+
+            return new PGPContentVerifier()
+            {
+                public int getHashAlgorithm()
+                {
+                    return hashAlgorithm;
+                }
+
+                public int getKeyAlgorithm()
+                {
+                    return keyAlgorithm;
+                }
+
+                public long getKeyID()
+                {
+                    return publicKey.getKeyID();
+                }
+
+                public boolean verify(byte[] expected)
+                {
+                    return signer.verifySignature(expected);
+                }
+
+                public OutputStream getOutputStream()
+                {
+                    return new SignerOutputStream(signer);
+                }
+            };
+        }
+    }
+}