diff --git a/crypto/src/math/ec/rfc7748/X25519.cs b/crypto/src/math/ec/rfc7748/X25519.cs
index d8db2527a..8524b9e2c 100644
--- a/crypto/src/math/ec/rfc7748/X25519.cs
+++ b/crypto/src/math/ec/rfc7748/X25519.cs
@@ -1,6 +1,7 @@
using System;
using System.Diagnostics;
+using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Rfc7748
@@ -50,6 +51,15 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748
n[7] |= 0x40000000U;
}
+ public static void GeneratePrivateKey(SecureRandom random, byte[] k)
+ {
+ random.NextBytes(k);
+
+ k[0] &= 0xF8;
+ k[ScalarSize - 1] &= 0x7F;
+ k[ScalarSize - 1] |= 0x40;
+ }
+
private static void PointDouble(int[] x, int[] z)
{
int[] A = X25519Field.Create();
diff --git a/crypto/src/math/ec/rfc7748/X448.cs b/crypto/src/math/ec/rfc7748/X448.cs
index 63d34d1cf..63e526703 100644
--- a/crypto/src/math/ec/rfc7748/X448.cs
+++ b/crypto/src/math/ec/rfc7748/X448.cs
@@ -1,6 +1,7 @@
using System;
using System.Diagnostics;
+using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Rfc7748
@@ -52,6 +53,14 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748
n[13] |= 0x80000000U;
}
+ public static void GeneratePrivateKey(SecureRandom random, byte[] k)
+ {
+ random.NextBytes(k);
+
+ k[0] &= 0xFC;
+ k[ScalarSize - 1] |= 0x80;
+ }
+
private static void PointDouble(uint[] x, uint[] z)
{
uint[] A = X448Field.Create();
diff --git a/crypto/src/math/ec/rfc8032/Ed25519.cs b/crypto/src/math/ec/rfc8032/Ed25519.cs
index 403f11f50..b77853f30 100644
--- a/crypto/src/math/ec/rfc8032/Ed25519.cs
+++ b/crypto/src/math/ec/rfc8032/Ed25519.cs
@@ -5,6 +5,7 @@ using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Math.EC.Rfc7748;
using Org.BouncyCastle.Math.Raw;
+using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Rfc8032
@@ -248,6 +249,11 @@ namespace Org.BouncyCastle.Math.EC.Rfc8032
r[rOff + PointBytes - 1] |= (byte)((x[0] & 1) << 7);
}
+ public static void GeneratePrivateKey(SecureRandom random, byte[] k)
+ {
+ random.NextBytes(k);
+ }
+
public static void GeneratePublicKey(byte[] sk, int skOff, byte[] pk, int pkOff)
{
IDigest d = CreateDigest();
diff --git a/crypto/src/math/ec/rfc8032/Ed448.cs b/crypto/src/math/ec/rfc8032/Ed448.cs
index 10ebe8f15..38bdee83e 100644
--- a/crypto/src/math/ec/rfc8032/Ed448.cs
+++ b/crypto/src/math/ec/rfc8032/Ed448.cs
@@ -5,6 +5,7 @@ using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Math.EC.Rfc7748;
using Org.BouncyCastle.Math.Raw;
+using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Rfc8032
@@ -257,6 +258,11 @@ namespace Org.BouncyCastle.Math.EC.Rfc8032
r[rOff + PointBytes - 1] = (byte)((x[0] & 1) << 7);
}
+ public static void GeneratePrivateKey(SecureRandom random, byte[] k)
+ {
+ random.NextBytes(k);
+ }
+
public static void GeneratePublicKey(byte[] sk, int skOff, byte[] pk, int pkOff)
{
IXof d = CreateXof();
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