#include <pgp_s2k.h>

Inheritance diagram for Botan::OpenPGP_S2K:

Public Member Functions
PBKDF *	clone () const

template<typename Alloc >
OctetString	derive_key (size_t out_len, std::string_view passphrase, const std::vector< uint8_t, Alloc > &salt, size_t iterations) const

template<typename Alloc >
OctetString	derive_key (size_t out_len, std::string_view passphrase, const std::vector< uint8_t, Alloc > &salt, std::chrono::milliseconds msec, size_t &iterations) const

OctetString	derive_key (size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, size_t iterations) const

OctetString	derive_key (size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, std::chrono::milliseconds msec, size_t &iterations) const

std::string	name () const override

std::unique_ptr< PBKDF >	new_object () const override

	OpenPGP_S2K (std::unique_ptr< HashFunction > hash)

size_t	pbkdf (uint8_t output_buf[], size_t output_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, size_t iterations, std::chrono::milliseconds msec) const override

secure_vector< uint8_t >	pbkdf_iterations (size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, size_t iterations) const

void	pbkdf_iterations (uint8_t out[], size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, size_t iterations) const

secure_vector< uint8_t >	pbkdf_timed (size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, std::chrono::milliseconds msec, size_t &iterations) const

void	pbkdf_timed (uint8_t out[], size_t out_len, std::string_view passphrase, const uint8_t salt[], size_t salt_len, std::chrono::milliseconds msec, size_t &iterations) const

Static Public Member Functions
static std::unique_ptr< PBKDF >	create (std::string_view algo_spec, std::string_view provider="")

static std::unique_ptr< PBKDF >	create_or_throw (std::string_view algo_spec, std::string_view provider="")

static size_t	decode_count (uint8_t encoded_iter)

static uint8_t	encode_count (size_t iterations)

static std::vector< std::string >	providers (std::string_view algo_spec)

Detailed Description

OpenPGP's S2K

See RFC 4880 sections 3.7.1.1, 3.7.1.2, and 3.7.1.3 If the salt is empty and iterations == 1, "simple" S2K is used If the salt is non-empty and iterations == 1, "salted" S2K is used If the salt is non-empty and iterations > 1, "iterated" S2K is used

Due to complexities of the PGP S2K algorithm, time-based derivation is not supported. So if iterations == 0 and msec.count() > 0, an exception is thrown. In the future this may be supported, in which case "iterated" S2K will be used and the number of iterations performed is returned.

Note that unlike PBKDF2, OpenPGP S2K's "iterations" are defined as the number of bytes hashed.

Definition at line 39 of file pgp_s2k.h.

Constructor & Destructor Documentation

◆ OpenPGP_S2K()

Botan::OpenPGP_S2K::OpenPGP_S2K ( std::unique_ptr< HashFunction > hash )

inlineexplicit

Parameters

hash	the hash function to use

Definition at line 44 of file pgp_s2k.h.

44: m_hash(std::move(hash)) {}

Member Function Documentation

◆ clone()

PBKDF * Botan::PBKDF::clone ( ) const

inlineinherited

Returns: new instance of this same algorithm

Definition at line 62 of file pbkdf.h.

62{ return this->new_object().release(); }

Botan::PBKDF::new_object

virtual std::unique_ptr< PBKDF > new_object() const =0

◆ create()

std::unique_ptr< PBKDF > Botan::PBKDF::create	(	std::string_view	algo_spec,
		std::string_view	provider = "" )

staticinherited

Create an instance based on a name If provider is empty then best available is chosen.

Parameters

algo_spec	algorithm name
provider	provider implementation to choose

Returns: a null pointer if the algo/provider combination cannot be found

Definition at line 23 of file pbkdf.cpp.

                                                                                    {
   const SCAN_Name req(algo_spec);
 
#if defined(BOTAN_HAS_PBKDF2)
   if(req.algo_name() == "PBKDF2") {
      // TODO OpenSSL
 
      if(provider.empty() || provider == "base") {
         if(auto mac = MessageAuthenticationCode::create("HMAC(" + req.arg(0) + ")")) {
            return std::make_unique<PKCS5_PBKDF2>(std::move(mac));
         }
 
         if(auto mac = MessageAuthenticationCode::create(req.arg(0))) {
            return std::make_unique<PKCS5_PBKDF2>(std::move(mac));
         }
      }
 
      return nullptr;
   }
#endif
 
#if defined(BOTAN_HAS_PGP_S2K)
   if(req.algo_name() == "OpenPGP-S2K" && req.arg_count() == 1) {
      if(auto hash = HashFunction::create(req.arg(0))) {
         return std::make_unique<OpenPGP_S2K>(std::move(hash));
      }
   }
#endif
 
   BOTAN_UNUSED(req);
   BOTAN_UNUSED(provider);
 
   return nullptr;
}

References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_count(), BOTAN_UNUSED, Botan::HashFunction::create(), and Botan::MessageAuthenticationCode::create().

Referenced by Botan::PBKDF::create_or_throw().

◆ create_or_throw()

std::unique_ptr< PBKDF > Botan::PBKDF::create_or_throw	(	std::string_view	algo_spec,
		std::string_view	provider = "" )

staticinherited

Create an instance based on a name, or throw if the algo/provider combination cannot be found. If provider is empty then best available is chosen.

Definition at line 59 of file pbkdf.cpp.

                                                                                        {
   if(auto pbkdf = PBKDF::create(algo, provider)) {
      return pbkdf;
   }
   throw Lookup_Error("PBKDF", algo, provider);
}

References Botan::PBKDF::create(), and Botan::PBKDF::pbkdf().

◆ decode_count()

static size_t Botan::OpenPGP_S2K::decode_count ( uint8_t encoded_iter )

inlinestatic

Definition at line 63 of file pgp_s2k.h.

63{ return RFC4880_decode_count(encoded_iter); }

Botan::RFC4880_decode_count

size_t RFC4880_decode_count(uint8_t iter)

Definition rfc4880.cpp:61

References Botan::RFC4880_decode_count().

◆ derive_key() [1/4]

template<typename Alloc >

OctetString Botan::PBKDF::derive_key	(	size_t	out_len,
		std::string_view	passphrase,
		const std::vector< uint8_t, Alloc > &	salt,
		size_t	iterations ) const

inlineinherited

Derive a key from a passphrase

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
iterations	the number of iterations to use (use 10K or more)

Definition at line 186 of file pbkdf.h.

                                                      {
         return OctetString(pbkdf_iterations(out_len, passphrase, salt.data(), salt.size(), iterations));
      }

◆ derive_key() [2/4]

template<typename Alloc >

OctetString Botan::PBKDF::derive_key	(	size_t	out_len,
		std::string_view	passphrase,
		const std::vector< uint8_t, Alloc > &	salt,
		std::chrono::milliseconds	msec,
		size_t &	iterations ) const

inlineinherited

Derive a key from a passphrase using a certain amount of time

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
msec	is how long to run the PBKDF
iterations	is set to the number of iterations used

Definition at line 220 of file pbkdf.h.

                                                       {
         return OctetString(pbkdf_timed(out_len, passphrase, salt.data(), salt.size(), msec, iterations));
      }

◆ derive_key() [3/4]

OctetString Botan::PBKDF::derive_key	(	size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		size_t	iterations ) const

inlineinherited

Derive a key from a passphrase

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
iterations	the number of iterations to use (use 10K or more)

Definition at line 173 of file pbkdf.h.

                                                                                                                    {
         return OctetString(pbkdf_iterations(out_len, passphrase, salt, salt_len, iterations));
      }

Referenced by Botan::check_passhash9(), and Botan::generate_passhash9().

◆ derive_key() [4/4]

OctetString Botan::PBKDF::derive_key	(	size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		std::chrono::milliseconds	msec,
		size_t &	iterations ) const

inlineinherited

Derive a key from a passphrase

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
msec	is how long to run the PBKDF
iterations	is set to the number of iterations used

Definition at line 202 of file pbkdf.h.

                                                       {
         return OctetString(pbkdf_timed(out_len, passphrase, salt, salt_len, msec, iterations));
      }

◆ encode_count()

static uint8_t Botan::OpenPGP_S2K::encode_count ( size_t iterations )

inlinestatic

RFC 4880 encodes the iteration count to a single-byte value

Definition at line 61 of file pgp_s2k.h.

61{ return RFC4880_encode_count(iterations); }

Botan::RFC4880_encode_count

uint8_t RFC4880_encode_count(size_t desired_iterations)

Definition rfc4880.cpp:47

References Botan::RFC4880_encode_count().

◆ name()

std::string Botan::OpenPGP_S2K::name ( ) const

inlineoverridevirtual

Returns: name of this PBKDF

Implements Botan::PBKDF.

Definition at line 46 of file pgp_s2k.h.

46{ return "OpenPGP-S2K(" + m_hash->name() + ")"; }

◆ new_object()

std::unique_ptr< PBKDF > Botan::OpenPGP_S2K::new_object ( ) const

inlineoverridevirtual

Returns: new instance of this same algorithm

Implements Botan::PBKDF.

Definition at line 48 of file pgp_s2k.h.

48{ return std::make_unique<OpenPGP_S2K>(m_hash->new_object()); }

◆ pbkdf()

size_t Botan::OpenPGP_S2K::pbkdf	(	uint8_t	out[],
		size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		size_t	iterations,
		std::chrono::milliseconds	msec ) const

overridevirtual

Derive a key from a passphrase for a number of iterations specified by either iterations or if iterations == 0 then running until msec time has elapsed.

Parameters

out	buffer to store the derived key, must be of out_len bytes
out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
iterations	the number of iterations to use (use 10K or more)
msec	if iterations is zero, then instead the PBKDF is run until msec milliseconds has passed.

Returns: the number of iterations performed

Implements Botan::PBKDF.

Definition at line 71 of file pgp_s2k.cpp.

                                                            {
   std::unique_ptr<PasswordHash> pwdhash;
 
   if(iterations == 0) {
      RFC4880_S2K_Family s2k_params(m_hash->new_object());
      iterations = s2k_params.tune(output_len, msec, 0, std::chrono::milliseconds(10))->iterations();
   }
 
   pgp_s2k(*m_hash, output_buf, output_len, password.data(), password.size(), salt, salt_len, iterations);
 
   return iterations;
}

References Botan::RFC4880_S2K_Family::tune().

◆ pbkdf_iterations() [1/2]

secure_vector< uint8_t > Botan::PBKDF::pbkdf_iterations	(	size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		size_t	iterations ) const

inherited

Derive a key from a passphrase for a number of iterations.

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
iterations	the number of iterations to use (use 10K or more)

Returns: the derived key

Definition at line 95 of file pbkdf.cpp.

                                                                                                              {
   secure_vector<uint8_t> out(out_len);
   pbkdf_iterations(out.data(), out_len, passphrase, salt, salt_len, iterations);
   return out;
}

References Botan::PBKDF::pbkdf_iterations().

◆ pbkdf_iterations() [2/2]

void Botan::PBKDF::pbkdf_iterations	(	uint8_t	out[],
		size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		size_t	iterations ) const

inherited

Derive a key from a passphrase for a number of iterations.

Parameters

out	buffer to store the derived key, must be of out_len bytes
out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
iterations	the number of iterations to use (use 10K or more)

Definition at line 80 of file pbkdf.cpp.

                                                      {
   if(iterations == 0) {
      throw Invalid_Argument(name() + ": Invalid iteration count");
   }
 
   const size_t iterations_run =
      pbkdf(out, out_len, passphrase, salt, salt_len, iterations, std::chrono::milliseconds(0));
   BOTAN_ASSERT_EQUAL(iterations, iterations_run, "Expected PBKDF iterations");
}

References BOTAN_ASSERT_EQUAL, Botan::PBKDF::name(), and Botan::PBKDF::pbkdf().

Referenced by Botan::PBKDF::pbkdf_iterations().

◆ pbkdf_timed() [1/2]

secure_vector< uint8_t > Botan::PBKDF::pbkdf_timed	(	size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		std::chrono::milliseconds	msec,
		size_t &	iterations ) const

inherited

Derive a key from a passphrase, running until msec time has elapsed.

Parameters

out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
msec	if iterations is zero, then instead the PBKDF is run until msec milliseconds has passed.
iterations	set to the number iterations executed

Returns: the derived key

Definition at line 102 of file pbkdf.cpp.

                                                                    {
   secure_vector<uint8_t> out(out_len);
   pbkdf_timed(out.data(), out_len, passphrase, salt, salt_len, msec, iterations);
   return out;
}

References Botan::PBKDF::pbkdf_timed().

◆ pbkdf_timed() [2/2]

void Botan::PBKDF::pbkdf_timed	(	uint8_t	out[],
		size_t	out_len,
		std::string_view	passphrase,
		const uint8_t	salt[],
		size_t	salt_len,
		std::chrono::milliseconds	msec,
		size_t &	iterations ) const

inherited

Derive a key from a passphrase, running until msec time has elapsed.

Parameters

out	buffer to store the derived key, must be of out_len bytes
out_len	the desired length of the key to produce
passphrase	the password to derive the key from
salt	a randomly chosen salt
salt_len	length of salt in bytes
msec	if iterations is zero, then instead the PBKDF is run until msec milliseconds has passed.
iterations	set to the number iterations executed

Definition at line 70 of file pbkdf.cpp.

                                                  {
   iterations = pbkdf(out, out_len, passphrase, salt, salt_len, 0, msec);
}

References Botan::PBKDF::pbkdf().

Referenced by Botan::PBKDF::pbkdf_timed().

◆ providers()

std::vector< std::string > Botan::PBKDF::providers ( std::string_view algo_spec )

staticinherited

Returns: list of available providers for this algorithm, empty if not available

Definition at line 66 of file pbkdf.cpp.

                                                              {
   return probe_providers_of<PBKDF>(algo_spec);
}

The documentation for this class was generated from the following files:

src/lib/pbkdf/pgp_s2k/pgp_s2k.h
src/lib/pbkdf/pgp_s2k/pgp_s2k.cpp

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ OpenPGP_S2K()

Member Function Documentation

◆ clone()

◆ create()

◆ create_or_throw()

◆ decode_count()

◆ derive_key() [1/4]

◆ derive_key() [2/4]

◆ derive_key() [3/4]

◆ derive_key() [4/4]

◆ encode_count()

◆ name()

◆ new_object()

◆ pbkdf()

◆ pbkdf_iterations() [1/2]

◆ pbkdf_iterations() [2/2]

◆ pbkdf_timed() [1/2]

◆ pbkdf_timed() [2/2]

◆ providers()