1 files changed, 164 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/CertificateRequest.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/CertificateRequest.java
new file mode 100644
index 000000000..a4e5bf9e8
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/CertificateRequest.java
@@ -0,0 +1,164 @@
+package org.spongycastle.crypto.tls;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Vector;
+
+import org.spongycastle.asn1.ASN1Encoding;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.x500.X500Name;
+
+/**
+ * Parsing and encoding of a <i>CertificateRequest</i> struct from RFC 4346.
+ * <p/>
+ * <pre>
+ * struct {
+ *     ClientCertificateType certificate_types<1..2^8-1>;
+ *     DistinguishedName certificate_authorities<3..2^16-1>;
+ * } CertificateRequest;
+ * </pre>
+ *
+ * @see ClientCertificateType
+ * @see X500Name
+ */
+public class CertificateRequest
+{
+    protected short[] certificateTypes;
+    protected Vector supportedSignatureAlgorithms;
+    protected Vector certificateAuthorities;
+
+    /*
+     * TODO RFC 5264 7.4.4 A list of the hash/signature algorithm pairs that the server is able to
+     * verify, listed in descending order of preference.
+     */
+
+    /**
+     * @param certificateTypes       see {@link ClientCertificateType} for valid constants.
+     * @param certificateAuthorities a {@link Vector} of {@link X500Name}.
+     */
+    public CertificateRequest(short[] certificateTypes, Vector supportedSignatureAlgorithms, Vector certificateAuthorities)
+    {
+        this.certificateTypes = certificateTypes;
+        this.supportedSignatureAlgorithms = supportedSignatureAlgorithms;
+        this.certificateAuthorities = certificateAuthorities;
+    }
+
+    /**
+     * @return an array of certificate types
+     * @see {@link ClientCertificateType}
+     */
+    public short[] getCertificateTypes()
+    {
+        return certificateTypes;
+    }
+
+    /**
+     * @return a {@link Vector} of {@link SignatureAndHashAlgorithm} (or null before TLS 1.2).
+     */
+    public Vector getSupportedSignatureAlgorithms()
+    {
+        return supportedSignatureAlgorithms;
+    }
+
+    /**
+     * @return a {@link Vector} of {@link X500Name}
+     */
+    public Vector getCertificateAuthorities()
+    {
+        return certificateAuthorities;
+    }
+
+    /**
+     * Encode this {@link CertificateRequest} to an {@link OutputStream}.
+     *
+     * @param output the {@link OutputStream} to encode to.
+     * @throws IOException
+     */
+    public void encode(OutputStream output)
+        throws IOException
+    {
+        if (certificateTypes == null || certificateTypes.length == 0)
+        {
+            TlsUtils.writeUint8(0, output);
+        }
+        else
+        {
+            TlsUtils.writeUint8ArrayWithUint8Length(certificateTypes, output);
+        }
+
+        if (supportedSignatureAlgorithms != null)
+        {
+            // TODO Check whether SignatureAlgorithm.anonymous is allowed here
+            TlsUtils.encodeSupportedSignatureAlgorithms(supportedSignatureAlgorithms, false, output);
+        }
+
+        if (certificateAuthorities == null || certificateAuthorities.isEmpty())
+        {
+            TlsUtils.writeUint16(0, output);
+        }
+        else
+        {
+            Vector derEncodings = new Vector(certificateAuthorities.size());
+
+            int totalLength = 0;
+            for (int i = 0; i < certificateAuthorities.size(); ++i)
+            {
+                X500Name certificateAuthority = (X500Name)certificateAuthorities.elementAt(i);
+                byte[] derEncoding = certificateAuthority.getEncoded(ASN1Encoding.DER);
+                derEncodings.addElement(derEncoding);
+                totalLength += derEncoding.length;
+            }
+
+            TlsUtils.checkUint16(totalLength);
+            TlsUtils.writeUint16(totalLength, output);
+
+            for (int i = 0; i < derEncodings.size(); ++i)
+            {
+                byte[] encDN = (byte[])derEncodings.elementAt(i);
+                output.write(encDN);
+            }
+        }
+    }
+
+    /**
+     * Parse a {@link CertificateRequest} from an {@link InputStream}.
+     * 
+     * @param context
+     *            the {@link TlsContext} of the current connection.
+     * @param input
+     *            the {@link InputStream} to parse from.
+     * @return a {@link CertificateRequest} object.
+     * @throws IOException
+     */
+    public static CertificateRequest parse(TlsContext context, InputStream input)
+        throws IOException
+    {
+        int numTypes = TlsUtils.readUint8(input);
+        short[] certificateTypes = new short[numTypes];
+        for (int i = 0; i < numTypes; ++i)
+        {
+            certificateTypes[i] = TlsUtils.readUint8(input);
+        }
+
+        Vector supportedSignatureAlgorithms = null;
+        if (TlsUtils.isTLSv12(context))
+        {
+            // TODO Check whether SignatureAlgorithm.anonymous is allowed here
+            supportedSignatureAlgorithms = TlsUtils.parseSupportedSignatureAlgorithms(false, input);
+        }
+
+        Vector certificateAuthorities = new Vector();
+        byte[] certAuthData = TlsUtils.readOpaque16(input);
+        ByteArrayInputStream bis = new ByteArrayInputStream(certAuthData);
+        while (bis.available() > 0)
+        {
+            byte[] derEncoding = TlsUtils.readOpaque16(bis);
+            ASN1Primitive asn1 = TlsUtils.readDERObject(derEncoding);
+            certificateAuthorities.addElement(X500Name.getInstance(asn1));
+        }
+
+        return new CertificateRequest(certificateTypes, supportedSignatureAlgorithms, certificateAuthorities);
+    }
+}