scripts

Mono.Security/Math/Prime/ConfidenceFactor.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace Mono.Math.Prime
+{
+	// Token: 0x02000009 RID: 9
+	public enum ConfidenceFactor
+	{
+		// Token: 0x0400002B RID: 43
+		ExtraLow,
+		// Token: 0x0400002C RID: 44
+		Low,
+		// Token: 0x0400002D RID: 45
+		Medium,
+		// Token: 0x0400002E RID: 46
+		High,
+		// Token: 0x0400002F RID: 47
+		ExtraHigh,
+		// Token: 0x04000030 RID: 48
+		Provable
+	}
+}

Mono.Security/Math/Prime/Generator/NextPrimeFinder.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Mono.Math.Prime.Generator
+{
+	// Token: 0x0200000B RID: 11
+	public class NextPrimeFinder : SequentialSearchPrimeGeneratorBase
+	{
+		// Token: 0x0600006D RID: 109 RVA: 0x00004AD4 File Offset: 0x00002CD4
+		protected override BigInteger GenerateSearchBase(int bits, object Context)
+		{
+			if (Context == null)
+			{
+				throw new ArgumentNullException("Context");
+			}
+			BigInteger bigInteger = new BigInteger((BigInteger)Context);
+			bigInteger.SetBit(0U);
+			return bigInteger;
+		}
+	}
+}

Mono.Security/Math/Prime/Generator/PrimeGeneratorBase.cs

@@ -0,0 +1,47 @@
+using System;
+
+namespace Mono.Math.Prime.Generator
+{
+	// Token: 0x0200000C RID: 12
+	public abstract class PrimeGeneratorBase
+	{
+		// Token: 0x17000002 RID: 2
+		// (get) Token: 0x0600006F RID: 111 RVA: 0x00004B10 File Offset: 0x00002D10
+		public virtual ConfidenceFactor Confidence
+		{
+			get
+			{
+				return ConfidenceFactor.Medium;
+			}
+		}
+
+		// Token: 0x17000003 RID: 3
+		// (get) Token: 0x06000070 RID: 112 RVA: 0x00004B14 File Offset: 0x00002D14
+		public virtual PrimalityTest PrimalityTest
+		{
+			get
+			{
+				return new PrimalityTest(PrimalityTests.RabinMillerTest);
+			}
+		}
+
+		// Token: 0x17000004 RID: 4
+		// (get) Token: 0x06000071 RID: 113 RVA: 0x00004B24 File Offset: 0x00002D24
+		public virtual int TrialDivisionBounds
+		{
+			get
+			{
+				return 4000;
+			}
+		}
+
+		// Token: 0x06000072 RID: 114 RVA: 0x00004B2C File Offset: 0x00002D2C
+		protected bool PostTrialDivisionTests(BigInteger bi)
+		{
+			return this.PrimalityTest(bi, this.Confidence);
+		}
+
+		// Token: 0x06000073 RID: 115
+		public abstract BigInteger GenerateNewPrime(int bits);
+	}
+}

Mono.Security/Math/Prime/Generator/SequentialSearchPrimeGeneratorBase.cs

@@ -0,0 +1,91 @@
+using System;
+
+namespace Mono.Math.Prime.Generator
+{
+	// Token: 0x0200000D RID: 13
+	public class SequentialSearchPrimeGeneratorBase : PrimeGeneratorBase
+	{
+		// Token: 0x06000075 RID: 117 RVA: 0x00004B48 File Offset: 0x00002D48
+		protected virtual BigInteger GenerateSearchBase(int bits, object context)
+		{
+			BigInteger bigInteger = BigInteger.GenerateRandom(bits);
+			bigInteger.SetBit(0U);
+			return bigInteger;
+		}
+
+		// Token: 0x06000076 RID: 118 RVA: 0x00004B64 File Offset: 0x00002D64
+		public override BigInteger GenerateNewPrime(int bits)
+		{
+			return this.GenerateNewPrime(bits, null);
+		}
+
+		// Token: 0x06000077 RID: 119 RVA: 0x00004B70 File Offset: 0x00002D70
+		public virtual BigInteger GenerateNewPrime(int bits, object context)
+		{
+			BigInteger bigInteger = this.GenerateSearchBase(bits, context);
+			uint num = bigInteger % 3234846615U;
+			int trialDivisionBounds = this.TrialDivisionBounds;
+			uint[] smallPrimes = BigInteger.smallPrimes;
+			for (;;)
+			{
+				if (num % 3U != 0U)
+				{
+					if (num % 5U != 0U)
+					{
+						if (num % 7U != 0U)
+						{
+							if (num % 11U != 0U)
+							{
+								if (num % 13U != 0U)
+								{
+									if (num % 17U != 0U)
+									{
+										if (num % 19U != 0U)
+										{
+											if (num % 23U != 0U)
+											{
+												if (num % 29U != 0U)
+												{
+													int num2 = 10;
+													while (num2 < smallPrimes.Length && (ulong)smallPrimes[num2] <= (ulong)((long)trialDivisionBounds))
+													{
+														if (bigInteger % smallPrimes[num2] == 0U)
+														{
+															goto IL_105;
+														}
+														num2++;
+													}
+													if (this.IsPrimeAcceptable(bigInteger, context))
+													{
+														if (this.PrimalityTest(bigInteger, this.Confidence))
+														{
+															break;
+														}
+													}
+												}
+											}
+										}
+									}
+								}
+							}
+						}
+					}
+				}
+				IL_105:
+				num += 2U;
+				if (num >= 3234846615U)
+				{
+					num -= 3234846615U;
+				}
+				bigInteger.Incr2();
+			}
+			return bigInteger;
+		}
+
+		// Token: 0x06000078 RID: 120 RVA: 0x00004CA4 File Offset: 0x00002EA4
+		protected virtual bool IsPrimeAcceptable(BigInteger bi, object context)
+		{
+			return true;
+		}
+	}
+}

Mono.Security/Math/Prime/PrimalityTest.cs

@@ -0,0 +1,8 @@
+using System;
+
+namespace Mono.Math.Prime
+{
+	// Token: 0x020000CA RID: 202
+	// (Invoke) Token: 0x0600070D RID: 1805
+	public delegate bool PrimalityTest(BigInteger bi, ConfidenceFactor confidence);
+}

Mono.Security/Math/Prime/PrimalityTests.cs

@@ -0,0 +1,176 @@
+using System;
+
+namespace Mono.Math.Prime
+{
+	// Token: 0x0200000A RID: 10
+	public sealed class PrimalityTests
+	{
+		// Token: 0x06000067 RID: 103 RVA: 0x00004774 File Offset: 0x00002974
+		private PrimalityTests()
+		{
+		}
+
+		// Token: 0x06000068 RID: 104 RVA: 0x0000477C File Offset: 0x0000297C
+		private static int GetSPPRounds(BigInteger bi, ConfidenceFactor confidence)
+		{
+			int num = bi.BitCount();
+			int num2;
+			if (num <= 100)
+			{
+				num2 = 27;
+			}
+			else if (num <= 150)
+			{
+				num2 = 18;
+			}
+			else if (num <= 200)
+			{
+				num2 = 15;
+			}
+			else if (num <= 250)
+			{
+				num2 = 12;
+			}
+			else if (num <= 300)
+			{
+				num2 = 9;
+			}
+			else if (num <= 350)
+			{
+				num2 = 8;
+			}
+			else if (num <= 400)
+			{
+				num2 = 7;
+			}
+			else if (num <= 500)
+			{
+				num2 = 6;
+			}
+			else if (num <= 600)
+			{
+				num2 = 5;
+			}
+			else if (num <= 800)
+			{
+				num2 = 4;
+			}
+			else if (num <= 1250)
+			{
+				num2 = 3;
+			}
+			else
+			{
+				num2 = 2;
+			}
+			switch (confidence)
+			{
+			case ConfidenceFactor.ExtraLow:
+				num2 >>= 2;
+				return (num2 == 0) ? 1 : num2;
+			case ConfidenceFactor.Low:
+				num2 >>= 1;
+				return (num2 == 0) ? 1 : num2;
+			case ConfidenceFactor.Medium:
+				return num2;
+			case ConfidenceFactor.High:
+				return num2 << 1;
+			case ConfidenceFactor.ExtraHigh:
+				return num2 << 2;
+			case ConfidenceFactor.Provable:
+				throw new Exception("The Rabin-Miller test can not be executed in a way such that its results are provable");
+			default:
+				throw new ArgumentOutOfRangeException("confidence");
+			}
+		}
+
+		// Token: 0x06000069 RID: 105 RVA: 0x000048C4 File Offset: 0x00002AC4
+		public static bool Test(BigInteger n, ConfidenceFactor confidence)
+		{
+			if (n.BitCount() < 33)
+			{
+				return PrimalityTests.SmallPrimeSppTest(n, confidence);
+			}
+			return PrimalityTests.RabinMillerTest(n, confidence);
+		}
+
+		// Token: 0x0600006A RID: 106 RVA: 0x000048E4 File Offset: 0x00002AE4
+		public static bool RabinMillerTest(BigInteger n, ConfidenceFactor confidence)
+		{
+			int num = n.BitCount();
+			int spprounds = PrimalityTests.GetSPPRounds(num, confidence);
+			BigInteger bigInteger = n - 1;
+			int num2 = bigInteger.LowestSetBit();
+			BigInteger bigInteger2 = bigInteger >> num2;
+			BigInteger.ModulusRing modulusRing = new BigInteger.ModulusRing(n);
+			BigInteger bigInteger3 = null;
+			if (n.BitCount() > 100)
+			{
+				bigInteger3 = modulusRing.Pow(2U, bigInteger2);
+			}
+			for (int i = 0; i < spprounds; i++)
+			{
+				if (i > 0 || bigInteger3 == null)
+				{
+					BigInteger bigInteger4;
+					do
+					{
+						bigInteger4 = BigInteger.GenerateRandom(num);
+					}
+					while (bigInteger4 <= 2 && bigInteger4 >= bigInteger);
+					bigInteger3 = modulusRing.Pow(bigInteger4, bigInteger2);
+				}
+				if (!(bigInteger3 == 1U))
+				{
+					int num3 = 0;
+					while (num3 < num2 && bigInteger3 != bigInteger)
+					{
+						bigInteger3 = modulusRing.Pow(bigInteger3, 2);
+						if (bigInteger3 == 1U)
+						{
+							return false;
+						}
+						num3++;
+					}
+					if (bigInteger3 != bigInteger)
+					{
+						return false;
+					}
+				}
+			}
+			return true;
+		}
+
+		// Token: 0x0600006B RID: 107 RVA: 0x00004A10 File Offset: 0x00002C10
+		public static bool SmallPrimeSppTest(BigInteger bi, ConfidenceFactor confidence)
+		{
+			int spprounds = PrimalityTests.GetSPPRounds(bi, confidence);
+			BigInteger bigInteger = bi - 1;
+			int num = bigInteger.LowestSetBit();
+			BigInteger bigInteger2 = bigInteger >> num;
+			BigInteger.ModulusRing modulusRing = new BigInteger.ModulusRing(bi);
+			for (int i = 0; i < spprounds; i++)
+			{
+				BigInteger bigInteger3 = modulusRing.Pow(BigInteger.smallPrimes[i], bigInteger2);
+				if (!(bigInteger3 == 1U))
+				{
+					bool flag = false;
+					for (int j = 0; j < num; j++)
+					{
+						if (bigInteger3 == bigInteger)
+						{
+							flag = true;
+							break;
+						}
+						bigInteger3 = bigInteger3 * bigInteger3 % bi;
+					}
+					if (!flag)
+					{
+						return false;
+					}
+				}
+			}
+			return true;
+		}
+	}
+}