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/*
* XMSS Verification Operation
* (C) 2016 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#ifndef BOTAN_XMSS_VERIFICATION_OPERATION_H__
#define BOTAN_XMSS_VERIFICATION_OPERATION_H__
#include <array>
#include <cstddef>
#include <iterator>
#include <string>
#include <botan/assert.h>
#include <botan/types.h>
#include <botan/xmss_publickey.h>
#include <botan/xmss_common_ops.h>
#include <botan/pk_ops.h>
#include <botan/internal/xmss_signature.h>
namespace Botan {
/**
* Provides signature verification capabilities for Extended Hash-Based
* Signatures (XMSS).
**/
class BOTAN_DLL XMSS_Verification_Operation
: public virtual PK_Ops::Verification,
public XMSS_Common_Ops
{
public:
XMSS_Verification_Operation(
const XMSS_PublicKey& public_key);
virtual ~XMSS_Verification_Operation() {}
virtual bool is_valid_signature(const byte sig[],
size_t sig_len) override;
void update(const byte msg[], size_t msg_len) override;
private:
/**
* Algorithm 13: "XMSS_rootFromSig"
* Computes a root node using an XMSS signature, a message and a seed.
*
* @param msg A message.
* @param sig The XMSS signature for msg.
* @param adrs A XMSS tree address.
* @param seed A seed.
*
* @return An n-byte string holding the value of the root of a tree
* defined by the input parameters.
**/
secure_vector<byte> root_from_signature(
const XMSS_Signature& sig,
const secure_vector<byte>& msg,
XMSS_Address& ards,
const secure_vector<byte>& seed);
/**
* Algorithm 14: "XMSS_verify"
* Verifies a XMSS signature using the corresponding XMSS public key.
*
* @param sig A XMSS signature.
* @param msg The message signed with sig.
* @paeam pub_key
*
* @return true if signature sig is valid for msg, false otherwise.
**/
bool verify(const XMSS_Signature& sig,
const secure_vector<byte>& msg,
const XMSS_PublicKey& pub_key);
XMSS_PublicKey m_pub_key;
secure_vector<byte> m_msg_buf;
};
}
#endif
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