sha1.h File Reference

SHA1 hash implementation and interface functions. More...

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Macros
#define	SHA1_MAC_LEN   20

Functions
int	hmac_sha1_vector (const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
	HMAC-SHA1 over data vector (RFC 2104) More...
int	hmac_sha1 (const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac)
	HMAC-SHA1 over data buffer (RFC 2104) More...
int	sha1_prf (const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
	SHA1-based Pseudo-Random Function (PRF) (IEEE 802.11i, 8.5.1.1) More...
int	sha1_t_prf (const u8 *key, size_t key_len, const char *label, const u8 *seed, size_t seed_len, u8 *buf, size_t buf_len)
	EAP-FAST Pseudo-Random Function (T-PRF) More...
int __must_check	tls_prf_sha1_md5 (const u8 *secret, size_t secret_len, const char *label, const u8 *seed, size_t seed_len, u8 *out, size_t outlen)
	Pseudo-Random Function for TLS (TLS-PRF, RFC 2246) More...
int	pbkdf2_sha1 (const char *passphrase, const u8 *ssid, size_t ssid_len, int iterations, u8 *buf, size_t buflen)
	SHA1-based key derivation function (PBKDF2) for IEEE 802.11i. More...

Detailed Description

SHA1 hash implementation and interface functions.

Function Documentation

int hmac_sha1	(	const u8 *	key,
		size_t	key_len,
		const u8 *	data,
		size_t	data_len,
		u8 *	mac
	)

HMAC-SHA1 over data buffer (RFC 2104)

Parameters

key	Key for HMAC operations
key_len	Length of the key in bytes
data	Pointers to the data area
data_len	Length of the data area
mac	Buffer for the hash (20 bytes)

Returns

0 on success, -1 of failure

int hmac_sha1_vector	(	const u8 *	key,
		size_t	key_len,
		size_t	num_elem,
		const u8 *	addr[],
		const size_t *	len,
		u8 *	mac
	)

HMAC-SHA1 over data vector (RFC 2104)

Parameters

key	Key for HMAC operations
key_len	Length of the key in bytes
num_elem	Number of elements in the data vector
addr	Pointers to the data areas
len	Lengths of the data blocks
mac	Buffer for the hash (20 bytes)

Returns

0 on success, -1 on failure

int pbkdf2_sha1	(	const char *	passphrase,
		const u8 *	ssid,
		size_t	ssid_len,
		int	iterations,
		u8 *	buf,
		size_t	buflen
	)

SHA1-based key derivation function (PBKDF2) for IEEE 802.11i.

Parameters

passphrase	ASCII passphrase
ssid	SSID
ssid_len	SSID length in bytes
iterations	Number of iterations to run
buf	Buffer for the generated key
buflen	Length of the buffer in bytes

Returns

0 on success, -1 of failure

This function is used to derive PSK for WPA-PSK. For this protocol, iterations is set to 4096 and buflen to 32. This function is described in IEEE Std 802.11-2004, Clause H.4. The main construction is from PKCS#5 v2.0.

int sha1_prf	(	const u8 *	key,
		size_t	key_len,
		const char *	label,
		const u8 *	data,
		size_t	data_len,
		u8 *	buf,
		size_t	buf_len
	)

SHA1-based Pseudo-Random Function (PRF) (IEEE 802.11i, 8.5.1.1)

Parameters

key	Key for PRF
key_len	Length of the key in bytes
label	A unique label for each purpose of the PRF
data	Extra data to bind into the key
data_len	Length of the data
buf	Buffer for the generated pseudo-random key
buf_len	Number of bytes of key to generate

Returns

0 on success, -1 of failure

This function is used to derive new, cryptographically separate keys from a given key (e.g., PMK in IEEE 802.11i).

int sha1_t_prf	(	const u8 *	key,
		size_t	key_len,
		const char *	label,
		const u8 *	seed,
		size_t	seed_len,
		u8 *	buf,
		size_t	buf_len
	)

EAP-FAST Pseudo-Random Function (T-PRF)

Parameters

key	Key for PRF
key_len	Length of the key in bytes
label	A unique label for each purpose of the PRF
seed	Seed value to bind into the key
seed_len	Length of the seed
buf	Buffer for the generated pseudo-random key
buf_len	Number of bytes of key to generate

Returns

0 on success, -1 of failure

This function is used to derive new, cryptographically separate keys from a given key for EAP-FAST. T-PRF is defined in RFC 4851, Section 5.5.

int __must_check tls_prf_sha1_md5	(	const u8 *	secret,
		size_t	secret_len,
		const char *	label,
		const u8 *	seed,
		size_t	seed_len,
		u8 *	out,
		size_t	outlen
	)

Pseudo-Random Function for TLS (TLS-PRF, RFC 2246)

Parameters

secret	Key for PRF
secret_len	Length of the key in bytes
label	A unique label for each purpose of the PRF
seed	Seed value to bind into the key
seed_len	Length of the seed
out	Buffer for the generated pseudo-random key
outlen	Number of bytes of key to generate

Returns

0 on success, -1 on failure.

This function is used to derive new, cryptographically separate keys from a given key in TLS. This PRF is defined in RFC 2246, Chapter 5.