3 files changed, 5 insertions, 9 deletions
diff --git a/crypto/src/math/ec/ECCurve.cs b/crypto/src/math/ec/ECCurve.cs
index d17c6b1c1..b37d62721 100644
--- a/crypto/src/math/ec/ECCurve.cs
+++ b/crypto/src/math/ec/ECCurve.cs
@@ -737,7 +737,6 @@ namespace Org.BouncyCastle.Math.EC
         private const int FP_DEFAULT_COORDS = COORD_JACOBIAN_MODIFIED;
 
         private static readonly HashSet<BigInteger> KnownQs = new HashSet<BigInteger>();
-        private static readonly SecureRandom random = new SecureRandom();
 
         protected readonly BigInteger m_q, m_r;
         protected readonly FpPoint m_infinity;
@@ -771,7 +770,8 @@ namespace Org.BouncyCastle.Math.EC
                         throw new ArgumentException("Fp q value out of range");
 
                     if (Primes.HasAnySmallFactors(q) ||
-                        !Primes.IsMRProbablePrime(q, random, GetNumberOfIterations(qBitLength, certainty)))
+                        !Primes.IsMRProbablePrime(q, SecureRandom.ArbitraryRandom,
+                            GetNumberOfIterations(qBitLength, certainty)))
                     {
                         throw new ArgumentException("Fp q value not prime");
                     }
diff --git a/crypto/src/math/ec/ECPoint.cs b/crypto/src/math/ec/ECPoint.cs
index fc0ddf035..ee7cf9a92 100644
--- a/crypto/src/math/ec/ECPoint.cs
+++ b/crypto/src/math/ec/ECPoint.cs
@@ -12,8 +12,6 @@ namespace Org.BouncyCastle.Math.EC
      */
     public abstract class ECPoint
     {
-        private static readonly SecureRandom Random = new SecureRandom();
-
         protected static ECFieldElement[] EMPTY_ZS = new ECFieldElement[0];
 
         protected static ECFieldElement[] GetInitialZCoords(ECCurve curve)
@@ -246,10 +244,7 @@ namespace Org.BouncyCastle.Math.EC
                      * Any side-channel in the implementation of 'inverse' now only leaks information about
                      * the value (z * b), and no longer reveals information about 'z' itself.
                      */
-                    // TODO Add CryptoServicesRegistrar class and use here
-                    //SecureRandom r = CryptoServicesRegistrar.GetSecureRandom();
-                    SecureRandom r = Random;
-                    ECFieldElement b = m_curve.RandomFieldElementMult(r);
+                    ECFieldElement b = m_curve.RandomFieldElementMult(SecureRandom.ArbitraryRandom);
                     ECFieldElement zInv = z.Multiply(b).Invert().Multiply(b);
                     return Normalize(zInv);
                 }
diff --git a/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs b/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs
index bb60edaf6..013100dc3 100644
--- a/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecP224R1FieldElement.cs
@@ -1,6 +1,7 @@
 using System;
 
 using Org.BouncyCastle.Math.Raw;
+using Org.BouncyCastle.Security;
 using Org.BouncyCastle.Utilities;
 using Org.BouncyCastle.Utilities.Encoders;
 
@@ -134,7 +135,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
             uint[] nc = Nat224.Create();
             SecP224R1Field.Negate(c, nc);
 
-            uint[] r = Mod.Random(SecP224R1Field.P);
+            uint[] r = Mod.Random(SecureRandom.ArbitraryRandom, SecP224R1Field.P);
             uint[] t = Nat224.Create();
 
             if (!IsSquare(c))