1 files changed, 82 insertions, 0 deletions
diff --git a/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/bc/BcContentSignerBuilder.java b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/bc/BcContentSignerBuilder.java
new file mode 100644
index 000000000..7160adff2
--- /dev/null
+++ b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/operator/bc/BcContentSignerBuilder.java
@@ -0,0 +1,82 @@
+package org.spongycastle.operator.bc;
+
+import java.io.OutputStream;
+import java.security.SecureRandom;
+import java.util.Map;
+
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.crypto.CryptoException;
+import org.spongycastle.crypto.Signer;
+import org.spongycastle.crypto.params.AsymmetricKeyParameter;
+import org.spongycastle.crypto.params.ParametersWithRandom;
+import org.spongycastle.operator.ContentSigner;
+import org.spongycastle.operator.OperatorCreationException;
+import org.spongycastle.operator.RuntimeOperatorException;
+
+public abstract class BcContentSignerBuilder
+{
+    private SecureRandom random;
+    private AlgorithmIdentifier sigAlgId;
+    private AlgorithmIdentifier digAlgId;
+
+    protected BcDigestProvider                digestProvider;
+
+    public BcContentSignerBuilder(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
+    {
+        this.sigAlgId = sigAlgId;
+        this.digAlgId = digAlgId;
+        this.digestProvider = BcDefaultDigestProvider.INSTANCE;
+    }
+
+    public BcContentSignerBuilder setSecureRandom(SecureRandom random)
+    {
+        this.random = random;
+
+        return this;
+    }
+
+    public ContentSigner build(AsymmetricKeyParameter privateKey)
+        throws OperatorCreationException
+    {
+        final Signer sig = createSigner(sigAlgId, digAlgId);
+
+        if (random != null)
+        {
+            sig.init(true, new ParametersWithRandom(privateKey, random));
+        }
+        else
+        {
+            sig.init(true, privateKey);
+        }
+
+        return new ContentSigner()
+        {
+            private BcSignerOutputStream stream = new BcSignerOutputStream(sig);
+
+            public AlgorithmIdentifier getAlgorithmIdentifier()
+            {
+                return sigAlgId;
+            }
+
+            public OutputStream getOutputStream()
+            {
+                return stream;
+            }
+
+            public byte[] getSignature()
+            {
+                try
+                {
+                    return stream.getSignature();
+                }
+                catch (CryptoException e)
+                {
+                    throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
+                }
+            }
+        };
+    }
+
+    protected abstract Signer createSigner(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier algorithmIdentifier)
+        throws OperatorCreationException;
+}