1 files changed, 54 insertions, 0 deletions
diff --git a/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12MacCalculatorBuilder.java b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12MacCalculatorBuilder.java
new file mode 100644
index 000000000..456d5b080
--- /dev/null
+++ b/libraries/spongycastle/pkix/src/main/java/org/spongycastle/pkcs/bc/BcPKCS12MacCalculatorBuilder.java
@@ -0,0 +1,54 @@
+package org.spongycastle.pkcs.bc;
+
+import java.security.SecureRandom;
+
+import org.spongycastle.asn1.DERNull;
+import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
+import org.spongycastle.asn1.pkcs.PKCS12PBEParams;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.crypto.ExtendedDigest;
+import org.spongycastle.crypto.digests.SHA1Digest;
+import org.spongycastle.operator.MacCalculator;
+import org.spongycastle.pkcs.PKCS12MacCalculatorBuilder;
+
+public class BcPKCS12MacCalculatorBuilder
+    implements PKCS12MacCalculatorBuilder
+{
+    private ExtendedDigest digest;
+    private AlgorithmIdentifier algorithmIdentifier;
+
+    private SecureRandom  random;
+    private int    saltLength;
+    private int    iterationCount = 1024;
+
+    public BcPKCS12MacCalculatorBuilder()
+    {
+        this(new SHA1Digest(), new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE));
+    }
+
+    public BcPKCS12MacCalculatorBuilder(ExtendedDigest digest, AlgorithmIdentifier algorithmIdentifier)
+    {
+        this.digest = digest;
+        this.algorithmIdentifier = algorithmIdentifier;
+        this.saltLength = digest.getDigestSize();
+    }
+
+    public AlgorithmIdentifier getDigestAlgorithmIdentifier()
+    {
+        return algorithmIdentifier;
+    }
+
+    public MacCalculator build(final char[] password)
+    {
+        if (random == null)
+        {
+            random = new SecureRandom();
+        }
+
+        byte[] salt = new byte[saltLength];
+
+        random.nextBytes(salt);
+
+        return PKCS12PBEUtils.createMacCalculator(algorithmIdentifier.getAlgorithm(), digest, new PKCS12PBEParams(salt, iterationCount), password);
+    }
+}