4 files changed, 6 insertions, 6 deletions
diff --git a/crypto/src/crypto/parameters/Ed25519PrivateKeyParameters.cs b/crypto/src/crypto/parameters/Ed25519PrivateKeyParameters.cs
index eeb782d8e..2bd6445b8 100644
--- a/crypto/src/crypto/parameters/Ed25519PrivateKeyParameters.cs
+++ b/crypto/src/crypto/parameters/Ed25519PrivateKeyParameters.cs
@@ -104,7 +104,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
             case Ed25519.Algorithm.Ed25519:
             {
                 if (null != ctx)
-                    throw new ArgumentException(nameof(ctx));
+                    throw new ArgumentOutOfRangeException(nameof(ctx));
 
                 Ed25519.Sign(data, 0, pk, 0, msg, msgOff, msgLen, sig, sigOff);
                 break;
@@ -126,7 +126,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
                 if (ctx.Length > 255)
                     throw new ArgumentOutOfRangeException(nameof(ctx));
                 if (Ed25519.PrehashSize != msgLen)
-                    throw new ArgumentException(nameof(msgLen));
+                    throw new ArgumentOutOfRangeException(nameof(msgLen));
 
                 Ed25519.SignPrehash(data, 0, pk, 0, ctx, msg, msgOff, sig, sigOff);
                 break;
diff --git a/crypto/src/crypto/parameters/Ed25519PublicKeyParameters.cs b/crypto/src/crypto/parameters/Ed25519PublicKeyParameters.cs
index 5465543a8..a454754f5 100644
--- a/crypto/src/crypto/parameters/Ed25519PublicKeyParameters.cs
+++ b/crypto/src/crypto/parameters/Ed25519PublicKeyParameters.cs
@@ -68,7 +68,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
             case Ed25519.Algorithm.Ed25519:
             {
                 if (null != ctx)
-                    throw new ArgumentException(nameof(ctx));
+                    throw new ArgumentOutOfRangeException(nameof(ctx));
 
                 return Ed25519.Verify(sig, sigOff, data, 0, msg, msgOff, msgLen);
             }
@@ -88,7 +88,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
                 if (ctx.Length > 255)
                     throw new ArgumentOutOfRangeException(nameof(ctx));
                 if (Ed25519.PrehashSize != msgLen)
-                    throw new ArgumentException(nameof(msgLen));
+                    throw new ArgumentOutOfRangeException(nameof(msgLen));
 
                 return Ed25519.VerifyPrehash(sig, sigOff, data, 0, ctx, msg, msgOff);
             }
diff --git a/crypto/src/crypto/parameters/Ed448PrivateKeyParameters.cs b/crypto/src/crypto/parameters/Ed448PrivateKeyParameters.cs
index a9283761b..9f442b21a 100644
--- a/crypto/src/crypto/parameters/Ed448PrivateKeyParameters.cs
+++ b/crypto/src/crypto/parameters/Ed448PrivateKeyParameters.cs
@@ -118,7 +118,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
                 if (ctx.Length > 255)
                     throw new ArgumentOutOfRangeException(nameof(ctx));
                 if (Ed448.PrehashSize != msgLen)
-                    throw new ArgumentException(nameof(msgLen));
+                    throw new ArgumentOutOfRangeException(nameof(msgLen));
 
                 Ed448.SignPrehash(data, 0, pk, 0, ctx, msg, msgOff, sig, sigOff);
                 break;
diff --git a/crypto/src/crypto/parameters/Ed448PublicKeyParameters.cs b/crypto/src/crypto/parameters/Ed448PublicKeyParameters.cs
index 2b12f37e5..d2ef7c891 100644
--- a/crypto/src/crypto/parameters/Ed448PublicKeyParameters.cs
+++ b/crypto/src/crypto/parameters/Ed448PublicKeyParameters.cs
@@ -81,7 +81,7 @@ namespace Org.BouncyCastle.Crypto.Parameters
                 if (ctx.Length > 255)
                     throw new ArgumentOutOfRangeException(nameof(ctx));
                 if (Ed448.PrehashSize != msgLen)
-                    throw new ArgumentException(nameof(msgLen));
+                    throw new ArgumentOutOfRangeException(nameof(msgLen));
 
                 return Ed448.VerifyPrehash(sig, sigOff, data, 0, ctx, msg, msgOff);
             }