1 files changed, 104 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/cms/SignerId.java b/pkix/src/main/java/org/spongycastle/cms/SignerId.java
new file mode 100644
index 00000000..a7434f8a
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/cms/SignerId.java
@@ -0,0 +1,104 @@
+package org.spongycastle.cms;
+
+import java.math.BigInteger;
+
+import org.spongycastle.asn1.x500.X500Name;
+import org.spongycastle.cert.selector.X509CertificateHolderSelector;
+import org.spongycastle.util.Selector;
+
+/**
+ * a basic index for a signer.
+ */
+public class SignerId
+    implements Selector
+{
+    private X509CertificateHolderSelector baseSelector;
+
+    private SignerId(X509CertificateHolderSelector baseSelector)
+    {
+        this.baseSelector = baseSelector;
+    }
+
+    /**
+     * Construct a signer ID with the value of a public key's subjectKeyId.
+     *
+     * @param subjectKeyId a subjectKeyId
+     */
+    public SignerId(byte[] subjectKeyId)
+    {
+        this(null, null, subjectKeyId);
+    }
+
+    /**
+     * Construct a signer ID based on the issuer and serial number of the signer's associated
+     * certificate.
+     *
+     * @param issuer the issuer of the signer's associated certificate.
+     * @param serialNumber the serial number of the signer's associated certificate.
+     */
+    public SignerId(X500Name issuer, BigInteger serialNumber)
+    {
+        this(issuer, serialNumber, null);
+    }
+
+    /**
+     * Construct a signer ID based on the issuer and serial number of the signer's associated
+     * certificate.
+     *
+     * @param issuer the issuer of the signer's associated certificate.
+     * @param serialNumber the serial number of the signer's associated certificate.
+     * @param subjectKeyId the subject key identifier to use to match the signers associated certificate.
+     */
+    public SignerId(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
+    {
+        this(new X509CertificateHolderSelector(issuer, serialNumber, subjectKeyId));
+    }
+
+    public X500Name getIssuer()
+    {
+        return baseSelector.getIssuer();
+    }
+
+    public BigInteger getSerialNumber()
+    {
+        return baseSelector.getSerialNumber();
+    }
+
+    public byte[] getSubjectKeyIdentifier()
+    {
+        return baseSelector.getSubjectKeyIdentifier();
+    }
+
+    public int hashCode()
+    {
+        return baseSelector.hashCode();
+    }
+
+    public boolean equals(
+        Object  o)
+    {
+        if (!(o instanceof SignerId))
+        {
+            return false;
+        }
+
+        SignerId id = (SignerId)o;
+
+        return this.baseSelector.equals(id.baseSelector);
+    }
+
+    public boolean match(Object obj)
+    {
+        if (obj instanceof SignerInformation)
+        {
+            return ((SignerInformation)obj).getSID().equals(this);
+        }
+
+        return baseSelector.match(obj);
+    }
+
+    public Object clone()
+    {
+        return new SignerId(this.baseSelector);
+    }
+}