diff options
Diffstat (limited to 'crypto/src/asn1/x9/X9Curve.cs')
| -rw-r--r-- | crypto/src/asn1/x9/X9Curve.cs | 161 |
1 files changed, 80 insertions, 81 deletions
diff --git a/crypto/src/asn1/x9/X9Curve.cs b/crypto/src/asn1/x9/X9Curve.cs index b92e7b3b5..f05a946c2 100644 --- a/crypto/src/asn1/x9/X9Curve.cs +++ b/crypto/src/asn1/x9/X9Curve.cs @@ -15,51 +15,50 @@ namespace Org.BouncyCastle.Asn1.X9 { private readonly ECCurve curve; private readonly byte[] seed; - private readonly DerObjectIdentifier fieldIdentifier; + private readonly DerObjectIdentifier fieldIdentifier; - public X9Curve( + public X9Curve( ECCurve curve) - : this(curve, null) + : this(curve, null) { - this.curve = curve; } - public X9Curve( + public X9Curve( ECCurve curve, byte[] seed) { - if (curve == null) - throw new ArgumentNullException("curve"); + if (curve == null) + throw new ArgumentNullException("curve"); - this.curve = curve; + this.curve = curve; this.seed = Arrays.Clone(seed); - if (curve is FpCurve) - { - this.fieldIdentifier = X9ObjectIdentifiers.PrimeField; - } - else if (curve is F2mCurve) - { - this.fieldIdentifier = X9ObjectIdentifiers.CharacteristicTwoField; - } - else - { - throw new ArgumentException("This type of ECCurve is not implemented"); - } - } - - public X9Curve( + if (ECAlgorithms.IsFpCurve(curve)) + { + this.fieldIdentifier = X9ObjectIdentifiers.PrimeField; + } + else if (ECAlgorithms.IsF2mCurve(curve)) + { + this.fieldIdentifier = X9ObjectIdentifiers.CharacteristicTwoField; + } + else + { + throw new ArgumentException("This type of ECCurve is not implemented"); + } + } + + public X9Curve( X9FieldID fieldID, Asn1Sequence seq) { - if (fieldID == null) - throw new ArgumentNullException("fieldID"); - if (seq == null) - throw new ArgumentNullException("seq"); + if (fieldID == null) + throw new ArgumentNullException("fieldID"); + if (seq == null) + throw new ArgumentNullException("seq"); - this.fieldIdentifier = fieldID.Identifier; + this.fieldIdentifier = fieldID.Identifier; - if (fieldIdentifier.Equals(X9ObjectIdentifiers.PrimeField)) + if (fieldIdentifier.Equals(X9ObjectIdentifiers.PrimeField)) { BigInteger q = ((DerInteger) fieldID.Parameters).Value; X9FieldElement x9A = new X9FieldElement(q, (Asn1OctetString) seq[0]); @@ -68,54 +67,54 @@ namespace Org.BouncyCastle.Asn1.X9 } else { - if (fieldIdentifier.Equals(X9ObjectIdentifiers.CharacteristicTwoField)) - { - // Characteristic two field - DerSequence parameters = (DerSequence)fieldID.Parameters; - int m = ((DerInteger)parameters[0]).Value.IntValue; - DerObjectIdentifier representation - = (DerObjectIdentifier)parameters[1]; - - int k1 = 0; - int k2 = 0; - int k3 = 0; - if (representation.Equals(X9ObjectIdentifiers.TPBasis)) - { - // Trinomial basis representation - k1 = ((DerInteger)parameters[2]).Value.IntValue; - } - else - { - // Pentanomial basis representation - DerSequence pentanomial = (DerSequence) parameters[2]; - k1 = ((DerInteger) pentanomial[0]).Value.IntValue; - k2 = ((DerInteger) pentanomial[1]).Value.IntValue; - k3 = ((DerInteger) pentanomial[2]).Value.IntValue; - } - X9FieldElement x9A = new X9FieldElement(m, k1, k2, k3, (Asn1OctetString)seq[0]); - X9FieldElement x9B = new X9FieldElement(m, k1, k2, k3, (Asn1OctetString)seq[1]); - // TODO Is it possible to get the order (n) and cofactor(h) too? - curve = new F2mCurve(m, k1, k2, k3, x9A.Value.ToBigInteger(), x9B.Value.ToBigInteger()); - } - } - - if (seq.Count == 3) + if (fieldIdentifier.Equals(X9ObjectIdentifiers.CharacteristicTwoField)) + { + // Characteristic two field + DerSequence parameters = (DerSequence)fieldID.Parameters; + int m = ((DerInteger)parameters[0]).Value.IntValue; + DerObjectIdentifier representation + = (DerObjectIdentifier)parameters[1]; + + int k1 = 0; + int k2 = 0; + int k3 = 0; + if (representation.Equals(X9ObjectIdentifiers.TPBasis)) + { + // Trinomial basis representation + k1 = ((DerInteger)parameters[2]).Value.IntValue; + } + else + { + // Pentanomial basis representation + DerSequence pentanomial = (DerSequence) parameters[2]; + k1 = ((DerInteger) pentanomial[0]).Value.IntValue; + k2 = ((DerInteger) pentanomial[1]).Value.IntValue; + k3 = ((DerInteger) pentanomial[2]).Value.IntValue; + } + X9FieldElement x9A = new X9FieldElement(m, k1, k2, k3, (Asn1OctetString)seq[0]); + X9FieldElement x9B = new X9FieldElement(m, k1, k2, k3, (Asn1OctetString)seq[1]); + // TODO Is it possible to get the order (n) and cofactor(h) too? + curve = new F2mCurve(m, k1, k2, k3, x9A.Value.ToBigInteger(), x9B.Value.ToBigInteger()); + } + } + + if (seq.Count == 3) { seed = ((DerBitString) seq[2]).GetBytes(); } } - public ECCurve Curve + public ECCurve Curve { - get { return curve; } + get { return curve; } } - public byte[] GetSeed() + public byte[] GetSeed() { return Arrays.Clone(seed); } - /** + /** * Produce an object suitable for an Asn1OutputStream. * <pre> * Curve ::= Sequence { @@ -127,21 +126,21 @@ namespace Org.BouncyCastle.Asn1.X9 */ public override Asn1Object ToAsn1Object() { - Asn1EncodableVector v = new Asn1EncodableVector(); - - if (fieldIdentifier.Equals(X9ObjectIdentifiers.PrimeField) - || fieldIdentifier.Equals(X9ObjectIdentifiers.CharacteristicTwoField)) - { - v.Add(new X9FieldElement(curve.A).ToAsn1Object()); - v.Add(new X9FieldElement(curve.B).ToAsn1Object()); - } - - if (seed != null) - { - v.Add(new DerBitString(seed)); - } - - return new DerSequence(v); - } + Asn1EncodableVector v = new Asn1EncodableVector(); + + if (fieldIdentifier.Equals(X9ObjectIdentifiers.PrimeField) + || fieldIdentifier.Equals(X9ObjectIdentifiers.CharacteristicTwoField)) + { + v.Add(new X9FieldElement(curve.A).ToAsn1Object()); + v.Add(new X9FieldElement(curve.B).ToAsn1Object()); + } + + if (seed != null) + { + v.Add(new DerBitString(seed)); + } + + return new DerSequence(v); + } } } |