pkcs5.h File Reference

#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include "hash.h"

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Macros
#define	YH_INTERNAL   __attribute__((visibility("hidden")))

Functions
bool YH_INTERNAL	pkcs5_pbkdf2_hmac (const uint8_t *password, size_t cb_password, const uint8_t *salt, size_t cb_salt, uint64_t iterations, hash_t hash, uint8_t *key, size_t cb_key)

Macro Definition Documentation

YH_INTERNAL

#define YH_INTERNAL   __attribute__((visibility("hidden")))

Definition at line 36 of file pkcs5.h.

Function Documentation

pkcs5_pbkdf2_hmac()

bool YH_INTERNAL pkcs5_pbkdf2_hmac	(	const uint8_t *	password,
		size_t	cb_password,
		const uint8_t *	salt,
		size_t	cb_salt,
		uint64_t	iterations,
		hash_t	hash,
		uint8_t *	key,
		size_t	cb_key )

Definition at line 27 of file pkcs5.c.

                                                                 {
  bool res = false;
 
#ifdef _WIN32_BCRYPT
  NTSTATUS status = 0;
  LPCWSTR alg = NULL;
  BCRYPT_ALG_HANDLE hAlg = 0;
 
  /* mingw64 defines the BCryptDeriveKeyPBKDF2 function, but its import library
   *doesn't include the export.
   **
   ** Once this is fixed, we can just call the function directly.  Until then,
   *we need to dynamically load the function.
   */
 
  typedef NTSTATUS WINAPI (
    *PFN_BCryptDeriveKeyPBKDF2)(BCRYPT_ALG_HANDLE hPrf, PUCHAR pbPassword,
                                ULONG cbPassword, PUCHAR pbSalt, ULONG cbSalt,
                                ULONGLONG cIterations, PUCHAR pbDerivedKey,
                                ULONG cbDerivedKey, ULONG dwFlags);
  HMODULE hBCrypt = NULL;
  PFN_BCryptDeriveKeyPBKDF2 fnBCryptDeriveKeyPBKDF2 = NULL;
 
  if (!(hBCrypt = LoadLibrary("bcrypt.dll"))) {
    goto cleanup;
  }
 
  if (!(fnBCryptDeriveKeyPBKDF2 = (PFN_BCryptDeriveKeyPBKDF2)(
          (void (*)(void)) GetProcAddress(hBCrypt, "BCryptDeriveKeyPBKDF2")))) {
    goto cleanup;
  }
 
  if (!(alg = get_hash(hash))) {
    goto cleanup;
  }
 
  if (!BCRYPT_SUCCESS(
        status = BCryptOpenAlgorithmProvider(&hAlg, alg, NULL,
                                             BCRYPT_ALG_HANDLE_HMAC_FLAG))) {
    goto cleanup;
  }
 
  if (!BCRYPT_SUCCESS(
        status =
          fnBCryptDeriveKeyPBKDF2(hAlg, (PUCHAR) password, (ULONG) cb_password,
                                  (PUCHAR) salt, (ULONG) cb_salt, iterations,
                                  key, (ULONG) cb_key, 0))) {
    goto cleanup;
  }
 
  res = true;
 
cleanup:
 
  if (hAlg) {
    BCryptCloseAlgorithmProvider(hAlg, 0);
  }
  if (hBCrypt) {
    FreeLibrary(hBCrypt);
  }
 
#else
  const EVP_MD *md = NULL;
 
  if (!(md = get_hash(hash))) {
    return false;
  }
 
  /* for some reason openssl always returns 1 for PBKDF2 */
  if (1 != PKCS5_PBKDF2_HMAC((const char *) password, cb_password, salt,
                             cb_salt, iterations, md, cb_key, key)) {
    return false;
  }
 
  res = true;
 
#endif
  return res;
}

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