Finish port of latest PRNG/DRBG stuff from Java

1 files changed, 14 insertions, 21 deletions

diff --git a/crypto/src/security/SecureRandom.cs b/crypto/src/security/SecureRandom.cs
index 4894a93e6..875709e57 100644
--- a/crypto/src/security/SecureRandom.cs
+++ b/crypto/src/security/SecureRandom.cs
@@ -164,13 +164,7 @@ namespace Org.BouncyCastle.Security
 
         public override int Next()
         {
-            for (;;)
-            {
-                int i = NextInt() & int.MaxValue;
-
-                if (i != int.MaxValue)
-                    return i;
-            }
+            return NextInt() & int.MaxValue;
         }
 
         public override int Next(int maxValue)
@@ -184,11 +178,9 @@ namespace Org.BouncyCastle.Security
             }
 
             // Test whether maxValue is a power of 2
-            if ((maxValue & -maxValue) == maxValue)
+            if ((maxValue & (maxValue - 1)) == 0)
             {
-                int val = NextInt() & int.MaxValue;
-                long lr = ((long) maxValue * (long) val) >> 31;
-                return (int) lr;
+                return NextInt() & (maxValue - 1);
             }
 
             int bits, result;
@@ -244,16 +236,17 @@ namespace Org.BouncyCastle.Security
 
         public virtual int NextInt()
         {
-            byte[] intBytes = new byte[4];
-            NextBytes(intBytes);
-
-            int result = 0;
-            for (int i = 0; i < 4; i++)
-            {
-                result = (result << 8) + (intBytes[i] & 0xff);
-            }
-
-            return result;
+            byte[] bytes = new byte[4];
+            NextBytes(bytes);
+
+            uint result = bytes[0];
+            result <<= 8;
+            result |= bytes[1];
+            result <<= 8;
+            result |= bytes[2];
+            result <<= 8;
+            result |= bytes[3];
+            return (int)result;
         }
 
         public virtual long NextLong()