1 files changed, 62 insertions, 0 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/math/field/GenericPolynomialExtensionField.java b/bcprov/src/main/java/org/bouncycastle/math/field/GenericPolynomialExtensionField.java
new file mode 100644
index 0000000..0b93a71
--- /dev/null
+++ b/bcprov/src/main/java/org/bouncycastle/math/field/GenericPolynomialExtensionField.java
@@ -0,0 +1,62 @@
+package org.bouncycastle.math.field;
+
+import java.math.BigInteger;
+
+import org.bouncycastle.util.Integers;
+
+class GenericPolynomialExtensionField implements PolynomialExtensionField
+{
+    protected final FiniteField subfield;
+    protected final Polynomial minimalPolynomial;
+
+    GenericPolynomialExtensionField(FiniteField subfield, Polynomial polynomial)
+    {
+        this.subfield = subfield;
+        this.minimalPolynomial = polynomial;
+    }
+
+    public BigInteger getCharacteristic()
+    {
+        return subfield.getCharacteristic();
+    }
+
+    public int getDimension()
+    {
+        return subfield.getDimension() * minimalPolynomial.getDegree();
+    }
+
+    public FiniteField getSubfield()
+    {
+        return subfield;
+    }
+
+    public int getDegree()
+    {
+        return minimalPolynomial.getDegree();
+    }
+
+    public Polynomial getMinimalPolynomial()
+    {
+        return minimalPolynomial;
+    }
+
+    public boolean equals(Object obj)
+    {
+        if (this == obj)
+        {
+            return true;
+        }
+        if (!(obj instanceof GenericPolynomialExtensionField))
+        {
+            return false;
+        }
+        GenericPolynomialExtensionField other = (GenericPolynomialExtensionField)obj;
+        return subfield.equals(other.subfield) && minimalPolynomial.equals(other.minimalPolynomial);
+    }
+
+    public int hashCode()
+    {
+        return subfield.hashCode()
+            ^ Integers.rotateLeft(minimalPolynomial.hashCode(), 16);
+    }
+}