1 files changed, 31 insertions, 0 deletions
diff --git a/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/PBESecretKeyDecryptor.java b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/PBESecretKeyDecryptor.java
new file mode 100644
index 000000000..2f75702fa
--- /dev/null
+++ b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/PBESecretKeyDecryptor.java
@@ -0,0 +1,31 @@
+package org.spongycastle.openpgp.operator;
+
+import org.spongycastle.bcpg.S2K;
+import org.spongycastle.openpgp.PGPException;
+
+public abstract class PBESecretKeyDecryptor
+{
+    private char[] passPhrase;
+    private PGPDigestCalculatorProvider calculatorProvider;
+
+    protected PBESecretKeyDecryptor(char[] passPhrase, PGPDigestCalculatorProvider calculatorProvider)
+    {
+        this.passPhrase = passPhrase;
+        this.calculatorProvider = calculatorProvider;
+    }
+
+    public PGPDigestCalculator getChecksumCalculator(int hashAlgorithm)
+        throws PGPException
+    {
+        return calculatorProvider.get(hashAlgorithm);
+    }
+
+    public byte[] makeKeyFromPassPhrase(int keyAlgorithm, S2K s2k)
+        throws PGPException
+    {
+        return PGPUtil.makeKeyFromPassPhrase(calculatorProvider, keyAlgorithm, s2k, passPhrase);
+    }
+
+    public abstract byte[] recoverKeyData(int encAlgorithm, byte[] key, byte[] iv, byte[] keyData, int keyOff, int keyLen)
+        throws PGPException;
+}