7#include <botan/bcrypt_pbkdf.h>
8#include <botan/internal/loadstor.h>
9#include <botan/internal/blowfish.h>
10#include <botan/internal/timer.h>
11#include <botan/internal/fmt.h>
12#include <botan/hash.h>
17 m_iterations(iterations)
24 return fmt(
"Bcrypt-PBKDF({})", m_iterations);
29 return "Bcrypt-PBKDF";
33 std::chrono::milliseconds msec,
35 std::chrono::milliseconds tune_time)
const
37 Timer timer(
"Bcrypt_PBKDF");
39 const size_t blocks = (output_length + 32 - 1) / 32;
44 const size_t starting_iter = 2;
49 uint8_t output[32] = { 0 };
50 pwhash->derive_key(output,
sizeof(output),
58 const uint64_t measured_time = timer.
value() / (timer.
events() / blocks);
60 const uint64_t target_nsec = msec.count() *
static_cast<uint64_t
>(1000000);
62 const uint64_t desired_increase = target_nsec / measured_time;
64 if(desired_increase == 0)
67 return this->
from_iterations(
static_cast<size_t>(desired_increase * starting_iter));
77 return std::make_unique<Bcrypt_PBKDF>(iter);
93 const size_t BCRYPT_PBKDF_OUTPUT = 32;
96 alignas(64)
static const uint8_t BCRYPT_PBKDF_MAGIC[BCRYPT_PBKDF_OUTPUT] = {
97 0x4F, 0x78, 0x79, 0x63, 0x68, 0x72, 0x6F, 0x6D,
98 0x61, 0x74, 0x69, 0x63, 0x42, 0x6C, 0x6F, 0x77,
99 0x66, 0x69, 0x73, 0x68, 0x53, 0x77, 0x61, 0x74,
100 0x44, 0x79, 0x6E, 0x61, 0x6D, 0x69, 0x74, 0x65
103 const size_t BCRYPT_PBKDF_WORKFACTOR = 6;
104 const size_t BCRYPT_PBKDF_ROUNDS = 64;
107 salt_hash.data(), salt_hash.size(),
108 BCRYPT_PBKDF_WORKFACTOR,
true);
110 copy_mem(tmp.data(), BCRYPT_PBKDF_MAGIC, BCRYPT_PBKDF_OUTPUT);
111 for(
size_t i = 0; i != BCRYPT_PBKDF_ROUNDS; ++i)
120 for(
size_t i = 0; i != 32/4; ++i)
123 store_be(w, &tmp[
sizeof(uint32_t)*i]);
126 xor_buf(out.data(), tmp.data(), BCRYPT_PBKDF_OUTPUT);
132 const char* password,
size_t password_len,
133 const uint8_t salt[],
size_t salt_len)
const
139 BOTAN_ARG_CHECK(output_len <= 10*1024*1024,
"Too much output for Bcrypt PBKDF");
141 const size_t BCRYPT_BLOCK_SIZE = 32;
142 const size_t blocks = (output_len + BCRYPT_BLOCK_SIZE - 1) / BCRYPT_BLOCK_SIZE;
145 const auto pass_hash =
146 sha512->process(
reinterpret_cast<const uint8_t*
>(password), password_len);
154 for(
size_t block = 0; block != blocks; ++block)
158 sha512->update(salt, salt_len);
159 sha512->update_be(
static_cast<uint32_t
>(block + 1));
160 sha512->final(salt_hash.data());
162 bcrypt_round(blowfish, pass_hash, salt_hash, out, tmp);
164 for(
size_t r = 1; r < m_iterations; ++r)
168 sha512->final(salt_hash.data());
170 bcrypt_round(blowfish, pass_hash, salt_hash, out, tmp);
173 for(
size_t i = 0; i != BCRYPT_BLOCK_SIZE; ++i)
175 const size_t dest = i * blocks + block;
176 if(dest < output_len)
177 output[dest] = out[i];
#define BOTAN_ARG_CHECK(expr, msg)
std::unique_ptr< PasswordHash > from_params(size_t i, size_t, size_t) const override
std::unique_ptr< PasswordHash > default_params() const override
std::unique_ptr< PasswordHash > tune(size_t output_length, std::chrono::milliseconds msec, size_t max_memory, std::chrono::milliseconds tune_msec) const override
std::string name() const override
std::unique_ptr< PasswordHash > from_iterations(size_t iter) const override
void derive_key(uint8_t out[], size_t out_len, const char *password, size_t password_len, const uint8_t salt[], size_t salt_len) const override
Bcrypt_PBKDF(size_t iterations)
std::string to_string() const override
void encrypt(const uint8_t in[], uint8_t out[]) const
void salted_set_key(const uint8_t key[], size_t key_length, const uint8_t salt[], size_t salt_length, const size_t workfactor, bool salt_first=false)
static std::unique_ptr< HashFunction > create_or_throw(std::string_view algo_spec, std::string_view provider="")
void run_until_elapsed(std::chrono::milliseconds msec, F f)
constexpr uint32_t load_le< uint32_t >(const uint8_t in[], size_t off)
std::string fmt(std::string_view format, const T &... args)
constexpr void copy_mem(T *out, const T *in, size_t n)
void xor_buf(uint8_t out[], const uint8_t in[], size_t length)
constexpr void store_be(uint16_t in, uint8_t out[2])
std::vector< T, secure_allocator< T > > secure_vector
constexpr void clear_mem(T *ptr, size_t n)