1 files changed, 63 insertions, 0 deletions
diff --git a/crypto/src/math/field/GenericPolynomialExtensionField.cs b/crypto/src/math/field/GenericPolynomialExtensionField.cs
new file mode 100644
index 000000000..13ef57165
--- /dev/null
+++ b/crypto/src/math/field/GenericPolynomialExtensionField.cs
@@ -0,0 +1,63 @@
+using System;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Math.Field
+{
+ internal class GenericPolynomialExtensionField
+ : IPolynomialExtensionField
+ {
+ protected readonly IFiniteField subfield;
+ protected readonly IPolynomial minimalPolynomial;
+
+ internal GenericPolynomialExtensionField(IFiniteField subfield, IPolynomial polynomial)
+ {
+ this.subfield = subfield;
+ this.minimalPolynomial = polynomial;
+ }
+
+ public virtual BigInteger Characteristic
+ {
+ get { return subfield.Characteristic; }
+ }
+
+ public virtual int Dimension
+ {
+ get { return subfield.Dimension * minimalPolynomial.Degree; }
+ }
+
+ public virtual IFiniteField Subfield
+ {
+ get { return subfield; }
+ }
+
+ public virtual int Degree
+ {
+ get { return minimalPolynomial.Degree; }
+ }
+
+ public virtual IPolynomial MinimalPolynomial
+ {
+ get { return minimalPolynomial; }
+ }
+
+ public override bool Equals(object obj)
+ {
+ if (this == obj)
+ {
+ return true;
+ }
+ GenericPolynomialExtensionField other = obj as GenericPolynomialExtensionField;
+ if (null == other)
+ {
+ return false;
+ }
+ return subfield.Equals(other.subfield) && minimalPolynomial.Equals(other.minimalPolynomial);
+ }
+
+ public override int GetHashCode()
+ {
+ return subfield.GetHashCode() ^ Integers.RotateLeft(minimalPolynomial.GetHashCode(), 16);
+ }
+ }
+}
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