1 files changed, 95 insertions, 0 deletions
diff --git a/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DHParameterSpec.java b/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DHParameterSpec.java
new file mode 100644
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+++ b/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DHParameterSpec.java
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+package javax.crypto.spec;
+
+import java.math.BigInteger;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * This class specifies the set of parameters used with the Diffie-Hellman
+ * algorithm, as specified in PKCS #3: <i>Diffie-Hellman Key-Agreement
+ * Standard</i>.
+ * <p>
+ * A central authority generates parameters and gives them to the two
+ * entities seeking to generate a secret key. The parameters are a prime
+ * <code>p</code>, a base <code>g</code>, and optionally the length
+ * in bits of the private value, <code>l</code>.
+ * <p>
+ * It is possible that more than one instance of parameters may be
+ * generated by a given central authority, and that there may be more than
+ * one central authority. Indeed, each individual may be its own central
+ * authority, with different entities having different parameters.
+ * 
+ * @see javax.crypto.KeyAgreement
+ */
+public class DHParameterSpec
+    implements AlgorithmParameterSpec
+{
+    private BigInteger  p;
+    private BigInteger  g;
+    private int         l;
+
+    /**
+     * Constructs a parameter set for Diffie-Hellman, using a prime modulus
+     * <code>p</code> and a base generator <code>g</code>.
+     * 
+     * @param p the prime modulus
+     * @param g the base generator
+     */
+    public DHParameterSpec(
+        BigInteger  p,
+        BigInteger  g)
+    {
+        this.p = p;
+        this.g = g;
+    }
+
+    /**
+     * Constructs a parameter set for Diffie-Hellman, using a prime modulus
+     * <code>p</code>, a base generator <code>g</code>, and the size in bits,
+     * <code>l</code>, of the random exponent (private value).
+     * 
+     * @param p the prime modulus
+     * @param g the base generator
+     * @param l the size in bits of the random exponent (private value)
+     */
+    public DHParameterSpec(
+        BigInteger  p,
+        BigInteger  g,
+        int         l)
+    {
+        this.p = p;
+        this.g = g;
+        this.l = l;
+    }
+
+    /**
+     * Returns the prime modulus <code>p</code>.
+     *
+     * @return the prime modulus <code>p</code>
+     */
+    public BigInteger getP()
+    {
+        return p;
+    }
+
+    /**
+     * Returns the base generator <code>g</code>.
+     *
+     * @return the base generator <code>g</code>
+     */
+    public BigInteger getG()
+    {
+        return g;
+    }
+
+    /**
+     * Returns the size in bits, <code>l</code>, of the random exponent
+     * (private value).
+     *
+     * @return the size in bits, <code>l</code>, of the random exponent
+     * (private value), or 0 if this size has not been set
+     */
+    public int getL()
+    {
+        return l;
+    }
+}