af-alg: Reset hmac/xcbc state before doing set_key()

src/libstrongswan/plugins/af_alg/af_alg_prf.c

@@ -139,6 +139,7 @@ METHOD(prf_t, set_key, bool,
 {
 	char buf[this->block_size];
 
+	this->ops->reset(this->ops);
 	if (this->xcbc)
 	{
 		/* The kernel currently does not support variable length XCBC keys,

src/libstrongswan/plugins/af_alg/af_alg_signer.c

@@ -156,6 +156,7 @@ METHOD(signer_t, get_block_size, size_t,
 METHOD(signer_t, set_key, bool,
 	private_af_alg_signer_t *this, chunk_t key)
 {
+	this->ops->reset(this->ops);
 	return this->ops->set_key(this->ops, key);
 }