diff options
Diffstat (limited to 'crypto/src/math/ec/ECCurve.cs')
| -rw-r--r-- | crypto/src/math/ec/ECCurve.cs | 75 |
1 files changed, 46 insertions, 29 deletions
diff --git a/crypto/src/math/ec/ECCurve.cs b/crypto/src/math/ec/ECCurve.cs index ed413597a..ee3bcc69b 100644 --- a/crypto/src/math/ec/ECCurve.cs +++ b/crypto/src/math/ec/ECCurve.cs @@ -71,8 +71,9 @@ namespace Org.BouncyCastle.Math.EC } } - protected IFiniteField m_field; + protected readonly IFiniteField m_field; protected ECFieldElement m_a, m_b; + protected BigInteger m_order, m_cofactor; protected int m_coord = COORD_AFFINE; protected ECMultiplier m_multiplier = null; @@ -220,6 +221,16 @@ namespace Org.BouncyCastle.Math.EC get { return m_b; } } + public virtual BigInteger Order + { + get { return m_order; } + } + + public virtual BigInteger Cofactor + { + get { return m_cofactor; } + } + public virtual int CoordinateSystem { get { return m_coord; } @@ -353,6 +364,11 @@ namespace Org.BouncyCastle.Math.EC protected readonly FpPoint m_infinity; public FpCurve(BigInteger q, BigInteger a, BigInteger b) + : this(q, a, b, null, null) + { + } + + public FpCurve(BigInteger q, BigInteger a, BigInteger b, BigInteger order, BigInteger cofactor) : base(FiniteFields.GetPrimeField(q)) { this.m_q = q; @@ -361,10 +377,17 @@ namespace Org.BouncyCastle.Math.EC this.m_a = FromBigInteger(a); this.m_b = FromBigInteger(b); + this.m_order = order; + this.m_cofactor = cofactor; this.m_coord = FP_DEFAULT_COORDS; } protected FpCurve(BigInteger q, BigInteger r, ECFieldElement a, ECFieldElement b) + : this(q, r, a, b, null, null) + { + } + + protected FpCurve(BigInteger q, BigInteger r, ECFieldElement a, ECFieldElement b, BigInteger order, BigInteger cofactor) : base(FiniteFields.GetPrimeField(q)) { this.m_q = q; @@ -373,12 +396,14 @@ namespace Org.BouncyCastle.Math.EC this.m_a = a; this.m_b = b; + this.m_order = order; + this.m_cofactor = cofactor; this.m_coord = FP_DEFAULT_COORDS; } protected override ECCurve CloneCurve() { - return new FpCurve(m_q, m_r, m_a, m_b); + return new FpCurve(m_q, m_r, m_a, m_b, m_order, m_cofactor); } public override bool SupportsCoordinateSystem(int coord) @@ -535,16 +560,6 @@ namespace Org.BouncyCastle.Math.EC private readonly int k3; /** - * The order of the base point of the curve. - */ - private readonly BigInteger n; - - /** - * The cofactor of the curve. - */ - private readonly BigInteger h; - - /** * The point at infinity on this curve. */ protected readonly F2mPoint m_infinity; @@ -598,8 +613,8 @@ namespace Org.BouncyCastle.Math.EC * @param b The coefficient <code>b</code> in the Weierstrass equation * for non-supersingular elliptic curves over * <code>F<sub>2<sup>m</sup></sub></code>. - * @param n The order of the main subgroup of the elliptic curve. - * @param h The cofactor of the elliptic curve, i.e. + * @param order The order of the main subgroup of the elliptic curve. + * @param cofactor The cofactor of the elliptic curve, i.e. * <code>#E<sub>a</sub>(F<sub>2<sup>m</sup></sub>) = h * n</code>. */ public F2mCurve( @@ -607,9 +622,9 @@ namespace Org.BouncyCastle.Math.EC int k, BigInteger a, BigInteger b, - BigInteger n, - BigInteger h) - : this(m, k, 0, 0, a, b, n, h) + BigInteger order, + BigInteger cofactor) + : this(m, k, 0, 0, a, b, order, cofactor) { } @@ -663,8 +678,8 @@ namespace Org.BouncyCastle.Math.EC * @param b The coefficient <code>b</code> in the Weierstrass equation * for non-supersingular elliptic curves over * <code>F<sub>2<sup>m</sup></sub></code>. - * @param n The order of the main subgroup of the elliptic curve. - * @param h The cofactor of the elliptic curve, i.e. + * @param order The order of the main subgroup of the elliptic curve. + * @param cofactor The cofactor of the elliptic curve, i.e. * <code>#E<sub>a</sub>(F<sub>2<sup>m</sup></sub>) = h * n</code>. */ public F2mCurve( @@ -674,16 +689,16 @@ namespace Org.BouncyCastle.Math.EC int k3, BigInteger a, BigInteger b, - BigInteger n, - BigInteger h) + BigInteger order, + BigInteger cofactor) : base(BuildField(m, k1, k2, k3)) { this.m = m; this.k1 = k1; this.k2 = k2; this.k3 = k3; - this.n = n; - this.h = h; + this.m_order = order; + this.m_cofactor = cofactor; this.m_infinity = new F2mPoint(this, null, null); if (k1 == 0) @@ -715,8 +730,8 @@ namespace Org.BouncyCastle.Math.EC this.k1 = k1; this.k2 = k2; this.k3 = k3; - this.n = order; - this.h = cofactor; + this.m_order = order; + this.m_cofactor = cofactor; this.m_infinity = new F2mPoint(this, null, null); this.m_a = a; @@ -726,7 +741,7 @@ namespace Org.BouncyCastle.Math.EC protected override ECCurve CloneCurve() { - return new F2mCurve(m, k1, k2, k3, m_a, m_b, n, h); + return new F2mCurve(m, k1, k2, k3, m_a, m_b, m_order, m_cofactor); } public override bool SupportsCoordinateSystem(int coord) @@ -810,7 +825,7 @@ namespace Org.BouncyCastle.Math.EC { get { - return n != null && h != null && m_a.BitLength <= 1 && m_b.IsOne; + return m_order != null && m_cofactor != null && m_b.IsOne && (m_a.IsZero || m_a.IsOne); } } @@ -973,14 +988,16 @@ namespace Org.BouncyCastle.Math.EC get { return k3; } } + [Obsolete("Use 'Order' property instead")] public BigInteger N { - get { return n; } + get { return m_order; } } + [Obsolete("Use 'Cofactor' property instead")] public BigInteger H { - get { return h; } + get { return m_cofactor; } } } } |