diff options
Diffstat (limited to 'crypto/src/math/ec/LongArray.cs')
| -rw-r--r-- | crypto/src/math/ec/LongArray.cs | 155 |
1 files changed, 55 insertions, 100 deletions
diff --git a/crypto/src/math/ec/LongArray.cs b/crypto/src/math/ec/LongArray.cs index 90ca49c77..aa36de215 100644 --- a/crypto/src/math/ec/LongArray.cs +++ b/crypto/src/math/ec/LongArray.cs @@ -1,27 +1,32 @@ using System; using System.Text; - +using Org.BouncyCastle.Math.Raw; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Math.EC { - internal sealed class LongArray + internal struct LongArray { + internal static bool AreAliased(ref LongArray a, ref LongArray b) + { + return a.m_data == b.m_data; + } + // TODO make m fixed for the LongArray, and hence compute T once and for all private ulong[] m_data; - public LongArray(int intLen) + internal LongArray(int intLen) { m_data = new ulong[intLen]; } - public LongArray(ulong[] data) + internal LongArray(ulong[] data) { m_data = data; } - public LongArray(ulong[] data, int off, int len) + internal LongArray(ulong[] data, int off, int len) { if (off == 0 && len == data.Length) { @@ -34,16 +39,14 @@ namespace Org.BouncyCastle.Math.EC } } - public LongArray(BigInteger bigInt) + internal LongArray(BigInteger bigInt) { if (bigInt == null || bigInt.SignValue < 0) - { - throw new ArgumentException("invalid F2m field value", "bigInt"); - } + throw new ArgumentException("invalid F2m field value", nameof(bigInt)); if (bigInt.SignValue == 0) { - m_data = new ulong[]{ 0UL }; + m_data = new ulong[1]{ 0UL }; return; } @@ -93,51 +96,44 @@ namespace Org.BouncyCastle.Math.EC Array.Copy(m_data, 0, z, zOff, m_data.Length); } - public bool IsOne() + internal bool IsOne() { ulong[] a = m_data; int aLen = a.Length; if (aLen < 1 || a[0] != 1UL) - { return false; - } + for (int i = 1; i < aLen; ++i) { if (a[i] != 0UL) - { return false; - } } return true; } - public bool IsZero() + internal bool IsZero() { ulong[] a = m_data; for (int i = 0; i < a.Length; ++i) { if (a[i] != 0UL) - { return false; - } } return true; } - public int GetUsedLength() + internal int GetUsedLength() { return GetUsedLengthFrom(m_data.Length); } - public int GetUsedLengthFrom(int from) + internal int GetUsedLengthFrom(int from) { ulong[] a = m_data; from = System.Math.Min(from, a.Length); if (from < 1) - { return 0; - } // Check if first element will act as sentinel if (a[0] != 0UL) @@ -160,16 +156,15 @@ namespace Org.BouncyCastle.Math.EC return 0; } - public int Degree() + internal int Degree() { int i = m_data.Length; ulong w; do { if (i == 0) - { return 0; - } + w = m_data[--i]; } while (w == 0UL); @@ -184,9 +179,8 @@ namespace Org.BouncyCastle.Math.EC do { if (i == 0) - { return 0; - } + w = m_data[--i]; } while (w == 0); @@ -206,13 +200,11 @@ namespace Org.BouncyCastle.Math.EC return newInts; } - public BigInteger ToBigInteger() + internal BigInteger ToBigInteger() { int usedLen = GetUsedLength(); if (usedLen == 0) - { return BigInteger.Zero; - } ulong highestInt = m_data[usedLen - 1]; byte[] temp = new byte[8]; @@ -273,12 +265,10 @@ namespace Org.BouncyCastle.Math.EC return prev; } - public LongArray AddOne() + internal LongArray AddOne() { if (m_data.Length == 0) - { - return new LongArray(new ulong[]{ 1UL }); - } + return new LongArray(new ulong[1]{ 1UL }); int resultLen = System.Math.Max(1, GetUsedLength()); ulong[] data = ResizedData(resultLen); @@ -333,13 +323,11 @@ namespace Org.BouncyCastle.Math.EC return prev; } - public void AddShiftedByWords(LongArray other, int words) + internal void AddShiftedByWords(LongArray other, int words) { int otherUsedLen = other.GetUsedLength(); if (otherUsedLen == 0) - { return; - } int minLen = otherUsedLen + words; if (minLen > m_data.Length) @@ -352,18 +340,12 @@ namespace Org.BouncyCastle.Math.EC private static void Add(ulong[] x, int xOff, ulong[] y, int yOff, int count) { - for (int i = 0; i < count; ++i) - { - x[xOff + i] ^= y[yOff + i]; - } + Nat.XorTo64(count, y, yOff, x, xOff); } private static void Add(ulong[] x, int xOff, ulong[] y, int yOff, ulong[] z, int zOff, int count) { - for (int i = 0; i < count; ++i) - { - z[zOff + i] = x[xOff + i] ^ y[yOff + i]; - } + Nat.Xor64(count, x, xOff, y, yOff, z, zOff); } private static void AddBoth(ulong[] x, int xOff, ulong[] y1, int y1Off, ulong[] y2, int y2Off, int count) @@ -393,7 +375,7 @@ namespace Org.BouncyCastle.Math.EC } } - public bool TestBitZero() + internal bool TestBitZero() { return m_data.Length > 0 && (m_data[0] & 1UL) != 0; } @@ -439,21 +421,18 @@ namespace Org.BouncyCastle.Math.EC } } - public LongArray ModMultiplyLD(LongArray other, int m, int[] ks) + internal LongArray ModMultiplyLD(LongArray other, int m, int[] ks) { /* * Find out the degree of each argument and handle the zero cases */ int aDeg = Degree(); if (aDeg == 0) - { return this; - } + int bDeg = other.Degree(); if (bDeg == 0) - { return other; - } /* * Swap if necessary so that A is the smaller argument @@ -476,9 +455,7 @@ namespace Org.BouncyCastle.Math.EC { ulong a0 = A.m_data[0]; if (a0 == 1UL) - { return B; - } /* * Fast path for small A, with performance dependent only on the number of set bits @@ -571,21 +548,18 @@ namespace Org.BouncyCastle.Math.EC return ReduceResult(c, 0, cLen, m, ks); } - public LongArray ModMultiply(LongArray other, int m, int[] ks) + internal LongArray ModMultiply(LongArray other, int m, int[] ks) { /* * Find out the degree of each argument and handle the zero cases */ int aDeg = Degree(); if (aDeg == 0) - { return this; - } + int bDeg = other.Degree(); if (bDeg == 0) - { return other; - } /* * Swap if necessary so that A is the smaller argument @@ -608,9 +582,7 @@ namespace Org.BouncyCastle.Math.EC { ulong a0 = A.m_data[0]; if (a0 == 1UL) - { return B; - } /* * Fast path for small A, with performance dependent only on the number of set bits @@ -681,9 +653,8 @@ namespace Org.BouncyCastle.Math.EC uint v = (uint)aVal & MASK; aVal >>= 4; AddBoth(c, cOff, T0, ti[u], T1, ti[v], bMax); if (aVal == 0UL) - { break; - } + cOff += cLen; } } @@ -702,28 +673,25 @@ namespace Org.BouncyCastle.Math.EC return ReduceResult(c, 0, cLen, m, ks); } - //public LongArray ModReduce(int m, int[] ks) + //internal LongArray ModReduce(int m, int[] ks) //{ // ulong[] buf = Arrays.Clone(m_data); // int rLen = ReduceInPlace(buf, 0, buf.Length, m, ks); // return new LongArray(buf, 0, rLen); //} - public LongArray Multiply(LongArray other, int m, int[] ks) + internal LongArray Multiply(LongArray other, int m, int[] ks) { /* * Find out the degree of each argument and handle the zero cases */ int aDeg = Degree(); if (aDeg == 0) - { return this; - } + int bDeg = other.Degree(); if (bDeg == 0) - { return other; - } /* * Swap if necessary so that A is the smaller argument @@ -746,9 +714,7 @@ namespace Org.BouncyCastle.Math.EC { ulong a0 = A.m_data[0]; if (a0 == 1UL) - { return B; - } /* * Fast path for small A, with performance dependent only on the number of set bits @@ -820,9 +786,8 @@ namespace Org.BouncyCastle.Math.EC uint v = (uint)aVal & MASK; aVal >>= 4; AddBoth(c, cOff, T0, ti[u], T1, ti[v], bMax); if (aVal == 0UL) - { break; - } + cOff += cLen; } } @@ -842,7 +807,7 @@ namespace Org.BouncyCastle.Math.EC return new LongArray(c, 0, cLen); } - public void Reduce(int m, int[] ks) + internal void Reduce(int m, int[] ks) { ulong[] buf = m_data; int rLen = ReduceInPlace(buf, 0, buf.Length, m, ks); @@ -863,9 +828,7 @@ namespace Org.BouncyCastle.Math.EC { int mLen = (m + 63) >> 6; if (len < mLen) - { return len; - } int numBits = System.Math.Min(len << 6, (m << 1) - 1); // TODO use actual degree? int excessBits = (len << 6) - numBits; @@ -994,19 +957,19 @@ namespace Org.BouncyCastle.Math.EC } } - public LongArray ModSquare(int m, int[] ks) + internal LongArray ModSquare(int m, int[] ks) { int len = GetUsedLength(); if (len == 0) return this; ulong[] r = new ulong[len << 1]; - Raw.Interleave.Expand64To128(m_data, 0, len, r, 0); + Interleave.Expand64To128(m_data, 0, len, r, 0); return new LongArray(r, 0, ReduceInPlace(r, 0, r.Length, m, ks)); } - public LongArray ModSquareN(int n, int m, int[] ks) + internal LongArray ModSquareN(int n, int m, int[] ks) { int len = GetUsedLength(); if (len == 0) @@ -1018,21 +981,21 @@ namespace Org.BouncyCastle.Math.EC while (--n >= 0) { - Raw.Interleave.Expand64To128(r, 0, len, r, 0); + Interleave.Expand64To128(r, 0, len, r, 0); len = ReduceInPlace(r, 0, r.Length, m, ks); } return new LongArray(r, 0, len); } - public LongArray Square(int m, int[] ks) + internal LongArray Square(int m, int[] ks) { int len = GetUsedLength(); if (len == 0) return this; ulong[] r = new ulong[len << 1]; - Raw.Interleave.Expand64To128(m_data, 0, len, r, 0); + Interleave.Expand64To128(m_data, 0, len, r, 0); return new LongArray(r, 0, r.Length); } @@ -1147,7 +1110,7 @@ namespace Org.BouncyCastle.Math.EC // return t4.ModMultiply(t1, m, ks); // } - public LongArray ModInverse(int m, int[] ks) + internal LongArray ModInverse(int m, int[] ks) { /* * Fermat's Little Theorem @@ -1188,16 +1151,13 @@ namespace Org.BouncyCastle.Math.EC */ int uzDegree = Degree(); if (uzDegree == 0) - { throw new InvalidOperationException(); - } + if (uzDegree == 1) - { return this; - } // u(z) := a(z) - LongArray uz = (LongArray)Copy(); + LongArray uz = Copy(); int t = (m + 63) >> 6; @@ -1237,9 +1197,7 @@ namespace Org.BouncyCastle.Math.EC int duv2 = uv[b].DegreeFrom(duv1); if (duv2 == 0) - { return gg[1 - b]; - } { int dgg2 = ggDeg[1 - b]; @@ -1263,26 +1221,25 @@ namespace Org.BouncyCastle.Math.EC public override bool Equals(object obj) { - return Equals(obj as LongArray); + if (obj is LongArray longArray) + return Equals(ref longArray); + + return false; } - public bool Equals(LongArray other) + internal bool Equals(ref LongArray other) { - if (this == other) + if (AreAliased(ref this, ref other)) return true; - if (null == other) - return false; + int usedLen = GetUsedLength(); if (other.GetUsedLength() != usedLen) - { return false; - } + for (int i = 0; i < usedLen; i++) { if (m_data[i] != other.m_data[i]) - { return false; - } } return true; } @@ -1311,9 +1268,7 @@ namespace Org.BouncyCastle.Math.EC { int i = GetUsedLength(); if (i == 0) - { return "0"; - } StringBuilder sb = new StringBuilder(i * 64); sb.Append(Convert.ToString((long)m_data[--i], 2)); |