xmss_verification_operation.h

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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 <botan/pk_ops.h>
#include <botan/xmss.h>
#include <botan/internal/xmss_hash.h>
#include <botan/internal/xmss_signature.h>
 
namespace Botan {
 
/**
 * Provides signature verification capabilities for Extended Hash-Based
 * Signatures (XMSS).
 **/
class XMSS_Verification_Operation final : public virtual PK_Ops::Verification {
   public:
      explicit XMSS_Verification_Operation(const XMSS_PublicKey& public_key);
 
      bool is_valid_signature(std::span<const uint8_t> sign) override;
 
      void update(std::span<const uint8_t> input) override;
 
      std::string hash_function() const override { return m_hash.hash_function(); }
 
   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 seed A seed.
       *
       * @return An n-byte string holding the value of the root of a tree
       *         defined by the input parameters.
       **/
      secure_vector<uint8_t> root_from_signature(const XMSS_Signature& sig,
                                                 const secure_vector<uint8_t>& msg,
                                                 const secure_vector<uint8_t>& 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.
       * @param pub_key the public key
       *
       * @return true if signature sig is valid for msg, false otherwise.
       **/
      bool verify(const XMSS_Signature& sig, const secure_vector<uint8_t>& msg, const XMSS_PublicKey& pub_key);
 
      const XMSS_PublicKey m_pub_key;
      XMSS_Hash m_hash;
      secure_vector<uint8_t> m_msg_buf;
};
 
}  // namespace Botan
 
#endif