1 files changed, 138 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/gost/AlgorithmParametersSpi.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/gost/AlgorithmParametersSpi.java
new file mode 100644
index 000000000..c046d0080
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/gost/AlgorithmParametersSpi.java
@@ -0,0 +1,138 @@
+package org.spongycastle.jcajce.provider.asymmetric.gost;
+
+import java.io.IOException;
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.InvalidParameterSpecException;
+
+import org.spongycastle.asn1.ASN1Encoding;
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
+import org.spongycastle.jce.spec.GOST3410ParameterSpec;
+import org.spongycastle.jce.spec.GOST3410PublicKeyParameterSetSpec;
+
+public class AlgorithmParametersSpi
+    extends java.security.AlgorithmParametersSpi
+{
+    GOST3410ParameterSpec currentSpec;
+
+    protected boolean isASN1FormatString(String format)
+    {
+        return format == null || format.equals("ASN.1");
+    }
+
+    protected AlgorithmParameterSpec engineGetParameterSpec(
+        Class paramSpec)
+        throws InvalidParameterSpecException
+    {
+        if (paramSpec == null)
+        {
+            throw new NullPointerException("argument to getParameterSpec must not be null");
+        }
+
+        return localEngineGetParameterSpec(paramSpec);
+    }
+
+
+    /**
+     * Return the X.509 ASN.1 structure GOST3410Parameter.
+     * <p/>
+     * <pre>
+     *  GOST3410Parameter ::= SEQUENCE {
+     *                   prime INTEGER, -- p
+     *                   subprime INTEGER, -- q
+     *                   base INTEGER, -- a}
+     * </pre>
+     */
+    protected byte[] engineGetEncoded()
+    {
+        GOST3410PublicKeyAlgParameters gost3410P = new GOST3410PublicKeyAlgParameters(new ASN1ObjectIdentifier(currentSpec.getPublicKeyParamSetOID()), new ASN1ObjectIdentifier(currentSpec.getDigestParamSetOID()), new ASN1ObjectIdentifier(currentSpec.getEncryptionParamSetOID()));
+
+        try
+        {
+            return gost3410P.getEncoded(ASN1Encoding.DER);
+        }
+        catch (IOException e)
+        {
+            throw new RuntimeException("Error encoding GOST3410Parameters");
+        }
+    }
+
+    protected byte[] engineGetEncoded(
+        String format)
+    {
+        if (isASN1FormatString(format) || format.equalsIgnoreCase("X.509"))
+        {
+            return engineGetEncoded();
+        }
+
+        return null;
+    }
+
+    protected AlgorithmParameterSpec localEngineGetParameterSpec(
+        Class paramSpec)
+        throws InvalidParameterSpecException
+    {
+        if (paramSpec == GOST3410PublicKeyParameterSetSpec.class)
+        {
+            return currentSpec;
+        }
+
+        throw new InvalidParameterSpecException("unknown parameter spec passed to GOST3410 parameters object.");
+    }
+
+    protected void engineInit(
+        AlgorithmParameterSpec paramSpec)
+        throws InvalidParameterSpecException
+    {
+        if (!(paramSpec instanceof GOST3410ParameterSpec))
+        {
+            throw new InvalidParameterSpecException("GOST3410ParameterSpec required to initialise a GOST3410 algorithm parameters object");
+        }
+
+        this.currentSpec = (GOST3410ParameterSpec)paramSpec;
+    }
+
+    protected void engineInit(
+        byte[] params)
+        throws IOException
+    {
+        try
+        {
+            ASN1Sequence seq = (ASN1Sequence)ASN1Primitive.fromByteArray(params);
+
+            this.currentSpec = GOST3410ParameterSpec.fromPublicKeyAlg(
+                new GOST3410PublicKeyAlgParameters(seq));
+        }
+        catch (ClassCastException e)
+        {
+            throw new IOException("Not a valid GOST3410 Parameter encoding.");
+        }
+        catch (ArrayIndexOutOfBoundsException e)
+        {
+            throw new IOException("Not a valid GOST3410 Parameter encoding.");
+        }
+    }
+
+    protected void engineInit(
+        byte[] params,
+        String format)
+        throws IOException
+    {
+        if (isASN1FormatString(format) || format.equalsIgnoreCase("X.509"))
+        {
+            engineInit(params);
+        }
+        else
+        {
+            throw new IOException("Unknown parameter format " + format);
+        }
+    }
+
+    protected String engineToString()
+    {
+        return "GOST3410 Parameters";
+    }
+
+}