crypt_genhash_impl.h File Reference

#include <stddef.h>
#include "my_macros.h"

Go to the source code of this file.

Macros
#define	ROUNDS_DEFAULT   5000
#define	ROUNDS_MIN   ROUNDS_DEFAULT
#define	ROUNDS_MAX   (0xFFF * 1000)
#define	MIXCHARS   32
#define	CRYPT_SALT_LENGTH   20
#define	CRYPT_MAGIC_LENGTH   3
#define	CRYPT_PARAM_LENGTH   13
#define	SHA256_HASH_LENGTH   43
#define	CRYPT_MAX_PASSWORD_SIZE
#define	MAX_PLAINTEXT_LENGTH   256

Functions
int	extract_user_salt (const char **salt_begin, const char **salt_end)
	Finds the interval which envelopes the user salt in a crypt password The crypt format is assumed to be $a$bbbb$cccccc\0 and the salt is found by counting the delimiters and marking begin and end. More...
char *	my_crypt_genhash (char *ctbuffer, size_t ctbufflen, const char *plaintext, size_t plaintext_len, const char *switchsalt, const char **params, unsigned int *num_rounds=nullptr)
void	generate_user_salt (char *buffer, int buffer_len)
	Generate a random string using ASCII characters but avoid separator character. More...
void	xor_string (char *to, int to_len, char *pattern, int pattern_len)

Macro Definition Documentation

CRYPT_MAGIC_LENGTH

#define CRYPT_MAGIC_LENGTH   3

CRYPT_MAX_PASSWORD_SIZE

#define CRYPT_MAX_PASSWORD_SIZE

Value:

  (CRYPT_SALT_LENGTH + SHA256_HASH_LENGTH + CRYPT_MAGIC_LENGTH + \
   CRYPT_PARAM_LENGTH)

CRYPT_PARAM_LENGTH

#define CRYPT_PARAM_LENGTH   13

CRYPT_SALT_LENGTH

#define CRYPT_SALT_LENGTH   20

MAX_PLAINTEXT_LENGTH

#define MAX_PLAINTEXT_LENGTH   256

MIXCHARS

#define MIXCHARS   32

ROUNDS_DEFAULT

#define ROUNDS_DEFAULT   5000

ROUNDS_MAX

#define ROUNDS_MAX   (0xFFF * 1000)

ROUNDS_MIN

#define ROUNDS_MIN   ROUNDS_DEFAULT

SHA256_HASH_LENGTH

#define SHA256_HASH_LENGTH   43

Function Documentation

extract_user_salt()

int extract_user_salt	(	const char **	salt_begin,
		const char **	salt_end
	)

Finds the interval which envelopes the user salt in a crypt password The crypt format is assumed to be $a$bbbb$cccccc\0 and the salt is found by counting the delimiters and marking begin and end.

Parameters

[in,out]	salt_begin	As input, pointer to start of crypt passwd, as output, pointer to first byte of the salt
[in,out]	salt_end	As input, pointer to the last byte in passwd, as output, pointer to the byte immediately following the salt ($)

Returns

The size of the salt identified

generate_user_salt()

void generate_user_salt	(	char *	buffer,
		int	buffer_len
	)

Generate a random string using ASCII characters but avoid separator character.

Stdlib rand and srand are used to produce pseudo random numbers between with about 7 bit worth of entropty between 1-127.

my_crypt_genhash()

char * my_crypt_genhash	(	char *	ctbuffer,
		size_t	ctbufflen,
		const char *	plaintext,
		size_t	plaintext_len,
		const char *	switchsalt,
		const char **	params,
		unsigned int *	num_rounds = nullptr
	)

xor_string()

void xor_string	(	char *	to,
		int	to_len,
		char *	pattern,
		int	pattern_len
	)