Botan  2.11.0
Crypto and TLS for C++11
Public Member Functions | Static Public Member Functions | List of all members
Botan::Bcrypt_PBKDF_Family Class Referencefinal

#include <bcrypt_pbkdf.h>

Inheritance diagram for Botan::Bcrypt_PBKDF_Family:
Botan::PasswordHashFamily

Public Member Functions

 Bcrypt_PBKDF_Family ()
 
std::unique_ptr< PasswordHashdefault_params () const override
 
std::unique_ptr< PasswordHashfrom_iterations (size_t iter) const override
 
std::unique_ptr< PasswordHashfrom_params (size_t i, size_t, size_t) const override
 
std::string name () const override
 
std::unique_ptr< PasswordHashtune (size_t output_length, std::chrono::milliseconds msec, size_t max_memory) const override
 

Static Public Member Functions

static std::unique_ptr< PasswordHashFamilycreate (const std::string &algo_spec, const std::string &provider="")
 
static std::unique_ptr< PasswordHashFamilycreate_or_throw (const std::string &algo_spec, const std::string &provider="")
 
static std::vector< std::string > providers (const std::string &algo_spec)
 

Detailed Description

Definition at line 46 of file bcrypt_pbkdf.h.

Constructor & Destructor Documentation

◆ Bcrypt_PBKDF_Family()

Botan::Bcrypt_PBKDF_Family::Bcrypt_PBKDF_Family ( )
inline

Definition at line 49 of file bcrypt_pbkdf.h.

49 {}

Member Function Documentation

◆ create()

std::unique_ptr< PasswordHashFamily > Botan::PasswordHashFamily::create ( const std::string &  algo_spec,
const std::string &  provider = "" 
)
staticinherited

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

Parameters
algo_specalgorithm name
providerprovider implementation to choose
Returns
a null pointer if the algo/provider combination cannot be found

Definition at line 33 of file pwdhash.cpp.

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

Referenced by botan_pwdhash(), botan_pwdhash_timed(), and Botan::PasswordHashFamily::create_or_throw().

35  {
36  const SCAN_Name req(algo_spec);
37 
38 #if defined(BOTAN_HAS_PBKDF2)
39  if(req.algo_name() == "PBKDF2")
40  {
41  // TODO OpenSSL
42 
43  if(provider.empty() || provider == "base")
44  {
45  if(auto mac = MessageAuthenticationCode::create(req.arg(0)))
46  return std::unique_ptr<PasswordHashFamily>(new PBKDF2_Family(mac.release()));
47 
48  if(auto mac = MessageAuthenticationCode::create("HMAC(" + req.arg(0) + ")"))
49  return std::unique_ptr<PasswordHashFamily>(new PBKDF2_Family(mac.release()));
50  }
51 
52  return nullptr;
53  }
54 #endif
55 
56 #if defined(BOTAN_HAS_SCRYPT)
57  if(req.algo_name() == "Scrypt")
58  {
59  return std::unique_ptr<PasswordHashFamily>(new Scrypt_Family);
60  }
61 #endif
62 
63 #if defined(BOTAN_HAS_ARGON2)
64  if(req.algo_name() == "Argon2d")
65  {
66  return std::unique_ptr<PasswordHashFamily>(new Argon2_Family(0));
67  }
68  else if(req.algo_name() == "Argon2i")
69  {
70  return std::unique_ptr<PasswordHashFamily>(new Argon2_Family(1));
71  }
72  else if(req.algo_name() == "Argon2id")
73  {
74  return std::unique_ptr<PasswordHashFamily>(new Argon2_Family(2));
75  }
76 #endif
77 
78 #if defined(BOTAN_HAS_PBKDF_BCRYPT)
79  if(req.algo_name() == "Bcrypt-PBKDF")
80  {
81  return std::unique_ptr<PasswordHashFamily>(new Bcrypt_PBKDF_Family);
82  }
83 #endif
84 
85 #if defined(BOTAN_HAS_PGP_S2K)
86  if(req.algo_name() == "OpenPGP-S2K" && req.arg_count() == 1)
87  {
88  if(auto hash = HashFunction::create(req.arg(0)))
89  {
90  return std::unique_ptr<PasswordHashFamily>(new RFC4880_S2K_Family(hash.release()));
91  }
92  }
93 #endif
94 
95  BOTAN_UNUSED(req);
96  BOTAN_UNUSED(provider);
97 
98  return nullptr;
99  }
static std::unique_ptr< MessageAuthenticationCode > create(const std::string &algo_spec, const std::string &provider="")
Definition: mac.cpp:46
static std::unique_ptr< HashFunction > create(const std::string &algo_spec, const std::string &provider="")
Definition: hash.cpp:110
#define BOTAN_UNUSED(...)
Definition: assert.h:142
MechanismType hash

◆ create_or_throw()

std::unique_ptr< PasswordHashFamily > Botan::PasswordHashFamily::create_or_throw ( const std::string &  algo_spec,
const std::string &  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 103 of file pwdhash.cpp.

References Botan::PasswordHashFamily::create().

105  {
106  if(auto pbkdf = PasswordHashFamily::create(algo, provider))
107  {
108  return pbkdf;
109  }
110  throw Lookup_Error("PasswordHashFamily", algo, provider);
111  }
static std::unique_ptr< PasswordHashFamily > create(const std::string &algo_spec, const std::string &provider="")
Definition: pwdhash.cpp:33

◆ default_params()

std::unique_ptr< PasswordHash > Botan::Bcrypt_PBKDF_Family::default_params ( ) const
overridevirtual

Return some default parameter set for this PBKDF that should be good enough for most users. The value returned may change over time as processing power and attacks improve.

Implements Botan::PasswordHashFamily.

Definition at line 68 of file bcrypt_pbkdf.cpp.

References from_iterations().

Referenced by tune().

69  {
70  return this->from_iterations(32); // About 100 ms on fast machine
71  }
std::unique_ptr< PasswordHash > from_iterations(size_t iter) const override

◆ from_iterations()

std::unique_ptr< PasswordHash > Botan::Bcrypt_PBKDF_Family::from_iterations ( size_t  iterations) const
overridevirtual

Return a parameter chosen based on a rough approximation with the specified iteration count. The exact value this returns for a particular algorithm may change from over time. Think of it as an alternative to tune, where time is expressed in terms of PBKDF2 iterations rather than milliseconds.

Implements Botan::PasswordHashFamily.

Definition at line 73 of file bcrypt_pbkdf.cpp.

Referenced by default_params(), from_params(), and tune().

74  {
75  return std::unique_ptr<PasswordHash>(new Bcrypt_PBKDF(iter));
76  }

◆ from_params()

std::unique_ptr< PasswordHash > Botan::Bcrypt_PBKDF_Family::from_params ( size_t  i1,
size_t  i2,
size_t  i3 
) const
overridevirtual

Create a password hash using some scheme specific format. Eg PBKDF2 and PGP-S2K set iterations in i1 Scrypt uses N,r,p in i{1-3} Bcrypt-PBKDF just has iterations Argon2{i,d,id} would use iterations, memory, parallelism for i{1-3}, and Argon2 type is part of the family.

Values not needed should be set to 0

Implements Botan::PasswordHashFamily.

Definition at line 78 of file bcrypt_pbkdf.cpp.

References from_iterations().

79  {
80  return this->from_iterations(iter);
81  }
std::unique_ptr< PasswordHash > from_iterations(size_t iter) const override

◆ name()

std::string Botan::Bcrypt_PBKDF_Family::name ( ) const
overridevirtual
Returns
name of this PasswordHash

Implements Botan::PasswordHashFamily.

Definition at line 29 of file bcrypt_pbkdf.cpp.

30  {
31  return "Bcrypt-PBKDF";
32  }

◆ providers()

std::vector< std::string > Botan::PasswordHashFamily::providers ( const std::string &  algo_spec)
staticinherited
Returns
list of available providers for this algorithm, empty if not available

Definition at line 113 of file pwdhash.cpp.

114  {
115  return probe_providers_of<PasswordHashFamily>(algo_spec, { "base", "openssl" });
116  }

◆ tune()

std::unique_ptr< PasswordHash > Botan::Bcrypt_PBKDF_Family::tune ( size_t  output_length,
std::chrono::milliseconds  msec,
size_t  max_memory_usage_mb 
) const
overridevirtual

Return a new parameter set tuned for this machine

Parameters
output_lengthhow long the output length will be
msecthe desired execution time in milliseconds
max_memory_usage_mbsome password hash functions can use a tunable amount of memory, in this case max_memory_usage limits the amount of RAM the returned parameters will require, in mebibytes (2**20 bytes). It may require some small amount above the request. Set to zero to place no limit at all.

Implements Botan::PasswordHashFamily.

Definition at line 34 of file bcrypt_pbkdf.cpp.

References Botan::bcrypt_pbkdf(), default_params(), Botan::Timer::events(), from_iterations(), Botan::Timer::run_until_elapsed(), and Botan::Timer::value().

37  {
38  Timer timer("Bcrypt_PBKDF");
39  const auto tune_time = BOTAN_PBKDF_TUNING_TIME;
40 
41  const size_t blocks = (output_length + 32 - 1) / 32;
42 
43  if(blocks == 0)
44  return default_params();
45 
46  const size_t starting_iter = 2;
47 
48  timer.run_until_elapsed(tune_time, [&]() {
49  uint8_t output[32] = { 0 };
50  bcrypt_pbkdf(output, sizeof(output), "test", 4, nullptr, 0, starting_iter);
51  });
52 
53  if(timer.events() < blocks || timer.value() == 0)
54  return default_params();
55 
56  const uint64_t measured_time = timer.value() / (timer.events() / blocks);
57 
58  const uint64_t target_nsec = msec.count() * static_cast<uint64_t>(1000000);
59 
60  const uint64_t desired_increase = target_nsec / measured_time;
61 
62  if(desired_increase == 0)
63  return this->from_iterations(starting_iter);
64 
65  return this->from_iterations(static_cast<size_t>(desired_increase * starting_iter));
66  }
void bcrypt_pbkdf(uint8_t output[], size_t output_len, const char *pass, size_t pass_len, const uint8_t salt[], size_t salt_len, size_t rounds)
std::unique_ptr< PasswordHash > from_iterations(size_t iter) const override
std::unique_ptr< PasswordHash > default_params() const override

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