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/*
* XMSS Public Key
* (C) 2016 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#ifndef BOTAN_XMSS_PUBLICKEY_H__
#define BOTAN_XMSS_PUBLICKEY_H__
#include <cstddef>
#include <iterator>
#include <memory>
#include <string>
#include <botan/alg_id.h>
#include <botan/asn1_oid.h>
#include <botan/der_enc.h>
#include <botan/assert.h>
#include <botan/exceptn.h>
#include <botan/rng.h>
#include <botan/types.h>
#include <botan/pk_keys.h>
#include <botan/xmss_parameters.h>
#include <botan/xmss_wots_parameters.h>
#include <botan/pk_ops.h>
namespace Botan {
class XMSS_Verification_Operation;
/**
* An XMSS: Extended Hash-Based Signature public key.
* The XMSS public key does not support the X509 standard. Instead the
* raw format described in [1] is used.
*
* [1] XMSS: Extended Hash-Based Signatures,
* draft-itrf-cfrg-xmss-hash-based-signatures-06
* Release: July 2016.
* https://datatracker.ietf.org/doc/
* draft-irtf-cfrg-xmss-hash-based-signatures/?include_text=1
**/
class BOTAN_DLL XMSS_PublicKey : public virtual Public_Key
{
public:
/**
* Creates a new XMSS public key for the chosen XMSS signature method.
* New public and prf seeds are generated using rng. The appropriate WOTS
* signature method will be automatically set based on the chosen XMSS
* signature method.
*
* @param xmss_oid Identifier for the selected XMSS signature method.
* @param rng A random number generator to use for key generation.
**/
XMSS_PublicKey(XMSS_Parameters::xmss_algorithm_t xmss_oid,
RandomNumberGenerator& rng)
: m_xmss_params(xmss_oid), m_wots_params(m_xmss_params.ots_oid()),
m_root(m_xmss_params.element_size()),
m_public_seed(rng.random_vec(m_xmss_params.element_size())) {}
/**
* Creates an XMSS public key from a byte sequence produced by
* raw_private_key().
**/
XMSS_PublicKey(const std::vector<uint8_t>& raw_key);
/**
* Creates a new XMSS public key for a chosen XMSS signature method as
* well as pre-computed root node and public_seed values.
*
* @param xmss_oid Identifier for the selected XMSS signature method.
* @param root Root node value.
* @param public_seed Public seed value.
**/
XMSS_PublicKey(XMSS_Parameters::xmss_algorithm_t xmss_oid,
const secure_vector<uint8_t>& root,
const secure_vector<uint8_t>& public_seed)
: m_xmss_params(xmss_oid), m_wots_params(m_xmss_params.ots_oid()),
m_root(root), m_public_seed(public_seed) {}
/**
* Creates a new XMSS public key for a chosen XMSS signature method as
* well as pre-computed root node and public_seed values.
*
* @param xmss_oid Identifier for the selected XMSS signature method.
* @param root Root node value.
* @param public_seed Public seed value.
**/
XMSS_PublicKey(XMSS_Parameters::xmss_algorithm_t xmss_oid,
secure_vector<uint8_t>&& root,
secure_vector<uint8_t>&& public_seed)
: m_xmss_params(xmss_oid), m_wots_params(m_xmss_params.ots_oid()),
m_root(std::move(root)), m_public_seed(std::move(public_seed)) {}
/**
* Retrieves the chosen XMSS signature method.
*
* @return XMSS signature method identifier.
**/
XMSS_Parameters::xmss_algorithm_t xmss_oid() const
{
return m_xmss_params.oid();
}
/**
* Sets the chosen XMSS signature method
**/
void set_xmss_oid(XMSS_Parameters::xmss_algorithm_t xmss_oid)
{
m_xmss_params = XMSS_Parameters(xmss_oid);
m_wots_params = XMSS_WOTS_Parameters(m_xmss_params.ots_oid());
}
/**
* Retrieves the XMSS parameters determined by the chosen XMSS Signature
* method.
*
* @return XMSS parameters.
**/
const XMSS_Parameters& xmss_parameters() const
{
return m_xmss_params;
}
/**
* Retrieves the Winternitz One Time Signature (WOTS) method,
* corrseponding to the chosen XMSS signature method.
*
* @return XMSS WOTS signature method identifier.
**/
XMSS_WOTS_Parameters::ots_algorithm_t wots_oid() const
{
return m_wots_params.oid();
}
/**
* Retrieves the Winternitz One Time Signature (WOTS) parameters
* corresponding to the chosen XMSS signature method.
*
* @return XMSS WOTS signature method parameters.
**/
const XMSS_WOTS_Parameters& wots_parameters() const
{
return m_wots_params;
}
secure_vector<uint8_t>& root()
{
return m_root;
}
void set_root(const secure_vector<uint8_t>& root)
{
m_root = root;
}
void set_root(secure_vector<uint8_t>&& root)
{
m_root = std::move(root);
}
const secure_vector<uint8_t>& root() const
{
return m_root;
}
virtual secure_vector<uint8_t>& public_seed()
{
return m_public_seed;
}
virtual void set_public_seed(const secure_vector<uint8_t>& public_seed)
{
m_public_seed = public_seed;
}
virtual void set_public_seed(secure_vector<uint8_t>&& public_seed)
{
m_public_seed = std::move(public_seed);
}
virtual const secure_vector<uint8_t>& public_seed() const
{
return m_public_seed;
}
std::string algo_name() const override
{
return "XMSS";
}
virtual AlgorithmIdentifier algorithm_identifier() const override
{
return AlgorithmIdentifier(get_oid(), AlgorithmIdentifier::USE_NULL_PARAM);
}
virtual bool check_key(RandomNumberGenerator&, bool) const override
{
return true;
}
virtual std::unique_ptr<PK_Ops::Verification>
create_verification_op(const std::string&,
const std::string& provider) const override;
virtual size_t estimated_strength() const override
{
return m_xmss_params.estimated_strength();
}
virtual size_t key_length() const override
{
return m_xmss_params.estimated_strength();
}
/**
* Returns a raw byte sequence as defined in [1].
* This method acts as an alias for raw_public_key().
*
* @return raw public key bits.
**/
virtual std::vector<uint8_t> public_key_bits() const override
{
return raw_public_key();
}
/**
* Size in bytes of the serialized XMSS public key produced by
* raw_public_key().
*
* @return size in bytes of serialized Public Key.
**/
virtual size_t size() const
{
return sizeof(uint32_t) + 2 * m_xmss_params.element_size();
}
/**
* Generates a non standardized byte sequence representing the XMSS
* public key, as defined in [1] (p. 23, "XMSS Public Key")
*
* @return 4-byte OID, followed by n-byte root node, followed by
* public seed.
**/
virtual std::vector<uint8_t> raw_public_key() const;
protected:
XMSS_Parameters m_xmss_params;
XMSS_WOTS_Parameters m_wots_params;
secure_vector<uint8_t> m_root;
secure_vector<uint8_t> m_public_seed;
private:
XMSS_Parameters::xmss_algorithm_t deserialize_xmss_oid(
const std::vector<uint8_t>& raw_key);
};
}
#endif
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