diff --git a/poly1305.cpp b/poly1305.cpp
index 9bef7585..6f778677 100644
--- a/poly1305.cpp
+++ b/poly1305.cpp
@@ -34,7 +34,9 @@ void Poly1305_Base<T>::UncheckedSetKey(const byte *key, unsigned int length, con
 	if (params.GetValue(Name::IV(), t) && t.begin() && t.size())
 	{
 		// Nonce key is a class member to avoid the zeroizer on a temporary
-		m_cipher.ProcessBlock(t.begin(), m_nk.begin());
+		CRYPTOPP_ASSERT(t.size() == m_nk.size());
+		std::memcpy(m_nk.begin(), t.begin(), m_nk.size());
+		m_cipher.ProcessBlock(m_nk.begin());
 
 		m_n[0] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk +  0);
 		m_n[1] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk +  4);
diff --git a/vmac.cpp b/vmac.cpp
index 8978a73a..c99b2692 100644
--- a/vmac.cpp
+++ b/vmac.cpp
@@ -69,8 +69,8 @@ void VMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, con
 	cipher.SetKey(userKey, keylength, params);
 	const unsigned int blockSize = cipher.BlockSize();
 	const unsigned int blockSizeInWords = blockSize / sizeof(word64);
-	SecBlock<word64> out(blockSizeInWords);
-	SecByteBlock in;
+	SecBlock<word64, AllocatorWithCleanup<word64, true> > out(blockSizeInWords);
+	AlignedSecByteBlock in;
 	in.CleanNew(blockSize);
 	size_t i;