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