1 files changed, 78 insertions, 0 deletions
diff --git a/libraries/spongycastle/pkix/src/main/java/org/spongycastle/openssl/jcajce/JcePEMEncryptorBuilder.java b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/openssl/jcajce/JcePEMEncryptorBuilder.java
new file mode 100644
index 000000000..4a3f76477
--- /dev/null
+++ b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/openssl/jcajce/JcePEMEncryptorBuilder.java
@@ -0,0 +1,78 @@
+package org.spongycastle.openssl.jcajce;
+
+import java.security.Provider;
+import java.security.SecureRandom;
+
+import org.spongycastle.jcajce.DefaultJcaJceHelper;
+import org.spongycastle.jcajce.JcaJceHelper;
+import org.spongycastle.jcajce.NamedJcaJceHelper;
+import org.spongycastle.jcajce.ProviderJcaJceHelper;
+import org.spongycastle.openssl.PEMEncryptor;
+import org.spongycastle.openssl.PEMException;
+
+public class JcePEMEncryptorBuilder
+{
+    private final String algorithm;
+
+    private JcaJceHelper helper = new DefaultJcaJceHelper();
+    private SecureRandom random;
+
+    public JcePEMEncryptorBuilder(String algorithm)
+    {
+        this.algorithm = algorithm;
+    }
+
+    public JcePEMEncryptorBuilder setProvider(Provider provider)
+    {
+        this.helper = new ProviderJcaJceHelper(provider);
+
+        return this;
+    }
+
+    public JcePEMEncryptorBuilder setProvider(String providerName)
+    {
+        this.helper = new NamedJcaJceHelper(providerName);
+
+        return this;
+    }
+
+    public JcePEMEncryptorBuilder setSecureRandom(SecureRandom random)
+    {
+        this.random = random;
+
+        return this;
+    }
+
+    public PEMEncryptor build(final char[] password)
+    {
+        if (random == null)
+        {
+            random = new SecureRandom();
+        }
+
+        int ivLength = algorithm.startsWith("AES-") ? 16 : 8;
+
+        final byte[] iv = new byte[ivLength];
+
+        random.nextBytes(iv);
+
+        return new PEMEncryptor()
+        {
+            public String getAlgorithm()
+            {
+                return algorithm;
+            }
+
+            public byte[] getIV()
+            {
+                return iv;
+            }
+
+            public byte[] encrypt(byte[] encoding)
+                throws PEMException
+            {
+                return PEMUtilities.crypt(true, helper, encoding, password, algorithm, iv);
+            }
+        };
+    }
+}