mirror of
https://github.com/urbit/shrub.git
synced 2024-12-29 23:23:52 +03:00
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
|
/*-
|
||
|
|
*/
|
||
|
|
#ifndef _CRYPTO_SCRYPT_H_
|
||
|
|
#define _CRYPTO_SCRYPT_H_
|
||
|
|
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C"{
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**
|
||
|
|
* crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
|
||
|
|
* Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r,
|
||
|
|
* p, buflen) and write the result into buf. The parameters r, p, and buflen
|
||
|
|
* must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32. The parameter N
|
||
|
|
* must be a power of 2 greater than 1.
|
||
|
|
*
|
||
|
|
* libscrypt_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
|
||
|
|
* password; duh
|
||
|
|
* N: CPU AND RAM cost (first modifier)
|
||
|
|
* r: RAM Cost
|
||
|
|
* p: CPU cost (parallelisation)
|
||
|
|
* In short, N is your main performance modifier. Values of r = 8, p = 1 are
|
||
|
|
* standard unless you want to modify the CPU/RAM ratio.
|
||
|
|
* Return 0 on success; or -1 on error.
|
||
|
|
*/
|
||
|
|
int libscrypt_scrypt(const uint8_t *, size_t, const uint8_t *, size_t, uint64_t,
|
||
|
|
uint32_t, uint32_t, /*@out@*/ uint8_t *, size_t);
|
||
|
|
|
||
|
|
/* Converts a series of input parameters to a MCF form for storage */
|
||
|
|
int libscrypt_mcf(uint32_t N, uint32_t r, uint32_t p, const char *salt,
|
||
|
|
const char *hash, char *mcf);
|
||
|
|
|
||
|
|
#ifndef _MSC_VER
|
||
|
|
/* Generates a salt. Uses /dev/urandom/
|
||
|
|
*/
|
||
|
|
int libscrypt_salt_gen(/*@out@*/ uint8_t *rand, size_t len);
|
||
|
|
|
||
|
|
/* Creates a hash of a passphrase using a randomly generated salt */
|
||
|
|
/* Returns >0 on success, or 0 for fail */
|
||
|
|
int libscrypt_hash(char *dst, const char* passphrase, uint32_t N, uint8_t r,
|
||
|
|
uint8_t p);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Checks a given MCF against a password */
|
||
|
|
int libscrypt_check(char *mcf, const char *password);
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Sane default values */
|
||
|
|
#define SCRYPT_HASH_LEN 64 /* This can be user defined -
|
||
|
|
*but 64 is the reference size
|
||
|
|
*/
|
||
|
|
#define SCRYPT_SAFE_N 30 /* This is much higher than you want. It's just
|
||
|
|
* a blocker for insane defines
|
||
|
|
*/
|
||
|
|
#define SCRYPT_SALT_LEN 16 /* This is just a recommended size */
|
||
|
|
/* Standard MCF is:
|
||
|
|
$s1 Identifier, three chars
|
||
|
|
$0e0810 Work order and separator, six chars
|
||
|
|
Formula for binary to base64 length = ceil(n/3)*4
|
||
|
|
$pcL+DWle903AXcKJVwMffA== Salt is 16 bytes, or 24 in Base64
|
||
|
|
$dn+9ujljVc5JTJMC2fYu1ZEHdJyqYkOurmcrBQbMHUfnD6qxbTmNiR075ohNBZjvp66E2aV1pfOrmyNHUefjMg== Hash is 64 bytes, or 88 in Base64.
|
||
|
|
Work order, salt and hash have separators (3)
|
||
|
|
3 + 6 + 24 + 88 + 3 + null byte = 125
|
||
|
|
This is rounded up to a multiple of four for alignment
|
||
|
|
*/
|
||
|
|
#define SCRYPT_MCF_LEN 128
|
||
|
|
#define SCRYPT_MCF_ID "$s1"
|
||
|
|
#define SCRYPT_N 16384
|
||
|
|
#define SCRYPT_r 8
|
||
|
|
#define SCRYPT_p 16
|
||
|
|
#endif /* !_CRYPTO_SCRYPT_H_ */
|