5 files changed, 15 insertions, 0 deletions
diff --git a/crypto/src/crypto/signers/Ed25519Signer.cs b/crypto/src/crypto/signers/Ed25519Signer.cs
index e58d14ea4..eb3d25398 100644
--- a/crypto/src/crypto/signers/Ed25519Signer.cs
+++ b/crypto/src/crypto/signers/Ed25519Signer.cs
@@ -98,7 +98,10 @@ namespace Org.BouncyCastle.Crypto.Signers
             internal bool VerifySignature(Ed25519PublicKeyParameters publicKey, byte[] signature)
             {
                 if (Ed25519.SignatureSize != signature.Length)
+                {
+                    Reset();
                     return false;
+                }
 
                 lock (this)
                 {
diff --git a/crypto/src/crypto/signers/Ed25519ctxSigner.cs b/crypto/src/crypto/signers/Ed25519ctxSigner.cs
index 2b5296e96..3610e25de 100644
--- a/crypto/src/crypto/signers/Ed25519ctxSigner.cs
+++ b/crypto/src/crypto/signers/Ed25519ctxSigner.cs
@@ -100,7 +100,10 @@ namespace Org.BouncyCastle.Crypto.Signers
             internal bool VerifySignature(Ed25519PublicKeyParameters publicKey, byte[] ctx, byte[] signature)
             {
                 if (Ed25519.SignatureSize != signature.Length)
+                {
+                    Reset();
                     return false;
+                }
 
                 lock (this)
                 {
diff --git a/crypto/src/crypto/signers/Ed25519phSigner.cs b/crypto/src/crypto/signers/Ed25519phSigner.cs
index cb3c3080a..8f4afab19 100644
--- a/crypto/src/crypto/signers/Ed25519phSigner.cs
+++ b/crypto/src/crypto/signers/Ed25519phSigner.cs
@@ -74,7 +74,10 @@ namespace Org.BouncyCastle.Crypto.Signers
             if (forSigning || null == publicKey)
                 throw new InvalidOperationException("Ed25519phSigner not initialised for verification");
             if (Ed25519.SignatureSize != signature.Length)
+            {
+                prehash.Reset();
                 return false;
+            }
 
             byte[] pk = publicKey.GetEncoded();
             return Ed25519.VerifyPrehash(signature, 0, pk, 0, context, prehash);
diff --git a/crypto/src/crypto/signers/Ed448Signer.cs b/crypto/src/crypto/signers/Ed448Signer.cs
index 9d1495f2e..746029834 100644
--- a/crypto/src/crypto/signers/Ed448Signer.cs
+++ b/crypto/src/crypto/signers/Ed448Signer.cs
@@ -100,7 +100,10 @@ namespace Org.BouncyCastle.Crypto.Signers
             internal bool VerifySignature(Ed448PublicKeyParameters publicKey, byte[] ctx, byte[] signature)
             {
                 if (Ed448.SignatureSize != signature.Length)
+                {
+                    Reset();
                     return false;
+                }
 
                 lock (this)
                 {
diff --git a/crypto/src/crypto/signers/Ed448phSigner.cs b/crypto/src/crypto/signers/Ed448phSigner.cs
index f01b6bfd4..197c2f706 100644
--- a/crypto/src/crypto/signers/Ed448phSigner.cs
+++ b/crypto/src/crypto/signers/Ed448phSigner.cs
@@ -74,7 +74,10 @@ namespace Org.BouncyCastle.Crypto.Signers
             if (forSigning || null == publicKey)
                 throw new InvalidOperationException("Ed448phSigner not initialised for verification");
             if (Ed448.SignatureSize != signature.Length)
+            {
+                prehash.Reset();
                 return false;
+            }
 
             byte[] pk = publicKey.GetEncoded();
             return Ed448.VerifyPrehash(signature, 0, pk, 0, context, prehash);