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-rw-r--r--crypto/src/math/raw/Nat.cs22
-rw-r--r--crypto/src/math/raw/Nat128.cs30
-rw-r--r--crypto/src/math/raw/Nat160.cs15
-rw-r--r--crypto/src/math/raw/Nat192.cs30
-rw-r--r--crypto/src/math/raw/Nat224.cs15
-rw-r--r--crypto/src/math/raw/Nat256.cs30
-rw-r--r--crypto/src/math/raw/Nat320.cs15
-rw-r--r--crypto/src/math/raw/Nat448.cs15
-rw-r--r--crypto/src/math/raw/Nat576.cs15
9 files changed, 16 insertions, 171 deletions
diff --git a/crypto/src/math/raw/Nat.cs b/crypto/src/math/raw/Nat.cs
index 9f2412580..d67de0a5c 100644
--- a/crypto/src/math/raw/Nat.cs
+++ b/crypto/src/math/raw/Nat.cs
@@ -515,32 +515,42 @@ namespace Org.BouncyCastle.Math.Raw
 
         public static uint[] FromBigInteger(int bits, BigInteger x)
         {
+            if (bits < 1)
+                throw new ArgumentException();
             if (x.SignValue < 0 || x.BitLength > bits)
                 throw new ArgumentException();
 
             int len = (bits + 31) >> 5;
+            Debug.Assert(len > 0);
             uint[] z = Create(len);
-            int i = 0;
-            while (x.SignValue != 0)
+
+            // NOTE: Use a fixed number of loop iterations
+            z[0] = (uint)x.IntValue;
+            for (int i = 1; i < len; ++i)
             {
-                z[i++] = (uint)x.IntValue;
                 x = x.ShiftRight(32);
+                z[i] = (uint)x.IntValue;
             }
             return z;
         }
 
         public static ulong[] FromBigInteger64(int bits, BigInteger x)
         {
+            if (bits < 1)
+                throw new ArgumentException();
             if (x.SignValue < 0 || x.BitLength > bits)
                 throw new ArgumentException();
 
             int len = (bits + 63) >> 6;
+            Debug.Assert(len > 0);
             ulong[] z = Create64(len);
-            int i = 0;
-            while (x.SignValue != 0)
+
+            // NOTE: Use a fixed number of loop iterations
+            z[0] = (ulong)x.LongValue;
+            for (int i = 1; i < len; ++i)
             {
-                z[i++] = (ulong)x.LongValue;
                 x = x.ShiftRight(64);
+                z[i] = (ulong)x.LongValue;
             }
             return z;
         }
diff --git a/crypto/src/math/raw/Nat128.cs b/crypto/src/math/raw/Nat128.cs
index 7617a9ee9..d336b320a 100644
--- a/crypto/src/math/raw/Nat128.cs
+++ b/crypto/src/math/raw/Nat128.cs
@@ -185,36 +185,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 128)
-                throw new ArgumentException();
-
-            uint[] z = Create();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (uint)x.IntValue;
-                x = x.ShiftRight(32);
-            }
-            return z;
-        }
-
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 128)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static uint GetBit(uint[] x, int bit)
         {
             if (bit == 0)
diff --git a/crypto/src/math/raw/Nat160.cs b/crypto/src/math/raw/Nat160.cs
index f5514d7b4..f862700b1 100644
--- a/crypto/src/math/raw/Nat160.cs
+++ b/crypto/src/math/raw/Nat160.cs
@@ -172,21 +172,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 160)
-                throw new ArgumentException();
-
-            uint[] z = Create();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (uint)x.IntValue;
-                x = x.ShiftRight(32);
-            }
-            return z;
-        }
-
         public static uint GetBit(uint[] x, int bit)
         {
             if (bit == 0)
diff --git a/crypto/src/math/raw/Nat192.cs b/crypto/src/math/raw/Nat192.cs
index 1311dee04..752290747 100644
--- a/crypto/src/math/raw/Nat192.cs
+++ b/crypto/src/math/raw/Nat192.cs
@@ -225,36 +225,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 192)
-                throw new ArgumentException();
-
-            uint[] z = Create();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (uint)x.IntValue;
-                x = x.ShiftRight(32);
-            }
-            return z;
-        }
-
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 192)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static uint GetBit(uint[] x, int bit)
         {
             if (bit == 0)
diff --git a/crypto/src/math/raw/Nat224.cs b/crypto/src/math/raw/Nat224.cs
index 565abcb9c..1aabd3f17 100644
--- a/crypto/src/math/raw/Nat224.cs
+++ b/crypto/src/math/raw/Nat224.cs
@@ -261,21 +261,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 224)
-                throw new ArgumentException();
-
-            uint[] z = Create();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (uint)x.IntValue;
-                x = x.ShiftRight(32);
-            }
-            return z;
-        }
-
         public static uint GetBit(uint[] x, int bit)
         {
             if (bit == 0)
diff --git a/crypto/src/math/raw/Nat256.cs b/crypto/src/math/raw/Nat256.cs
index 5c473c405..710060bee 100644
--- a/crypto/src/math/raw/Nat256.cs
+++ b/crypto/src/math/raw/Nat256.cs
@@ -323,36 +323,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static uint[] FromBigInteger(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 256)
-                throw new ArgumentException();
-
-            uint[] z = Create();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (uint)x.IntValue;
-                x = x.ShiftRight(32);
-            }
-            return z;
-        }
-
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 256)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static uint GetBit(uint[] x, int bit)
         {
             if (bit == 0)
diff --git a/crypto/src/math/raw/Nat320.cs b/crypto/src/math/raw/Nat320.cs
index 0ad677db4..0b250aa77 100644
--- a/crypto/src/math/raw/Nat320.cs
+++ b/crypto/src/math/raw/Nat320.cs
@@ -47,21 +47,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 320)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static bool IsOne64(ulong[] x)
         {
             if (x[0] != 1UL)
diff --git a/crypto/src/math/raw/Nat448.cs b/crypto/src/math/raw/Nat448.cs
index b0774b37a..8c7f3244d 100644
--- a/crypto/src/math/raw/Nat448.cs
+++ b/crypto/src/math/raw/Nat448.cs
@@ -51,21 +51,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 448)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static bool IsOne64(ulong[] x)
         {
             if (x[0] != 1UL)
diff --git a/crypto/src/math/raw/Nat576.cs b/crypto/src/math/raw/Nat576.cs
index 14279b61a..174d52bcf 100644
--- a/crypto/src/math/raw/Nat576.cs
+++ b/crypto/src/math/raw/Nat576.cs
@@ -55,21 +55,6 @@ namespace Org.BouncyCastle.Math.Raw
             return true;
         }
 
-        public static ulong[] FromBigInteger64(BigInteger x)
-        {
-            if (x.SignValue < 0 || x.BitLength > 576)
-                throw new ArgumentException();
-
-            ulong[] z = Create64();
-            int i = 0;
-            while (x.SignValue != 0)
-            {
-                z[i++] = (ulong)x.LongValue;
-                x = x.ShiftRight(64);
-            }
-            return z;
-        }
-
         public static bool IsOne64(ulong[] x)
         {
             if (x[0] != 1UL)
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-09-20 06:47:08 +0000