1 files changed, 66 insertions, 0 deletions
diff --git a/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12PBEInputDecryptorProviderBuilder.java b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12PBEInputDecryptorProviderBuilder.java
new file mode 100644
index 000000000..a4618c042
--- /dev/null
+++ b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12PBEInputDecryptorProviderBuilder.java
@@ -0,0 +1,66 @@
+package org.spongycastle.pkcs.bc;
+
+import java.io.InputStream;
+
+import org.spongycastle.asn1.pkcs.PKCS12PBEParams;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.crypto.CipherParameters;
+import org.spongycastle.crypto.ExtendedDigest;
+import org.spongycastle.crypto.digests.SHA1Digest;
+import org.spongycastle.crypto.generators.PKCS12ParametersGenerator;
+import org.spongycastle.crypto.io.CipherInputStream;
+import org.spongycastle.crypto.paddings.PaddedBufferedBlockCipher;
+import org.spongycastle.operator.GenericKey;
+import org.spongycastle.operator.InputDecryptor;
+import org.spongycastle.operator.InputDecryptorProvider;
+
+public class BcPKCS12PBEInputDecryptorProviderBuilder
+{
+    private ExtendedDigest digest;
+
+    public BcPKCS12PBEInputDecryptorProviderBuilder()
+    {
+         this(new SHA1Digest());
+    }
+
+    public BcPKCS12PBEInputDecryptorProviderBuilder(ExtendedDigest digest)
+    {
+         this.digest = digest;
+    }
+
+    public InputDecryptorProvider build(final char[] password)
+    {
+        return new InputDecryptorProvider()
+        {
+            public InputDecryptor get(final AlgorithmIdentifier algorithmIdentifier)
+            {
+                final PaddedBufferedBlockCipher engine = PKCS12PBEUtils.getEngine(algorithmIdentifier.getAlgorithm());
+
+                PKCS12PBEParams           pbeParams = PKCS12PBEParams.getInstance(algorithmIdentifier.getParameters());
+
+                CipherParameters params = PKCS12PBEUtils.createCipherParameters(algorithmIdentifier.getAlgorithm(), digest, engine.getBlockSize(), pbeParams, password);
+
+                engine.init(false, params);
+
+                return new InputDecryptor()
+                {
+                    public AlgorithmIdentifier getAlgorithmIdentifier()
+                    {
+                        return algorithmIdentifier;
+                    }
+
+                    public InputStream getInputStream(InputStream input)
+                    {
+                        return new CipherInputStream(input, engine);
+                    }
+
+                    public GenericKey getKey()
+                    {
+                        return new GenericKey(PKCS12ParametersGenerator.PKCS12PasswordToBytes(password));
+                    }
+                };
+            }
+        };
+
+    }
+}