GPRS GEA3/GEA4 ciphering algorithm

Implementation of GPRS Ciphers GEA3 and GEA4. More...

Files
file	gea.h
	GEA3/GEA4 header.
file	gea.c

Functions
int	gea3 (uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv, enum gprs_cipher_direction direction)
	Performs the GEA3 algorithm as in 3GPP TS 55.216 V6.2.0. More...
int	gea4 (uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv, enum gprs_cipher_direction direction)
	Performs the GEA4 algorithm as in 3GPP TS 55.226 V9.0.0. More...

Detailed Description

Implementation of GPRS Ciphers GEA3 and GEA4.

Function Documentation

gea3()

int gea3	(	uint8_t *	out,
		uint16_t	len,
		uint8_t *	kc,
		uint32_t	iv,
		enum gprs_cipher_direction	direction
	)

Performs the GEA3 algorithm as in 3GPP TS 55.216 V6.2.0.

Parameters

[in,out]	out	Buffer for gamma for encrypted/decrypted
[in]	len	Length of out, in bytes
[in]	kc	Buffer with the ciphering key
[in]	iv	Init vector
[in]	direct	Direction: 0 (MS -> SGSN) or 1 (SGSN -> MS)

References gea4(), GPRS_ALGO_GEA4, gprs_cipher_key_length(), len, and osmo_c4().

gea4()

int gea4	(	uint8_t *	out,
		uint16_t	len,
		uint8_t *	kc,
		uint32_t	iv,
		enum gprs_cipher_direction	direction
	)

Performs the GEA4 algorithm as in 3GPP TS 55.226 V9.0.0.

Parameters

[in,out]	out	Buffer for gamma for encrypted/decrypted
[in]	len	Length of out, in bytes
[in]	kc	Buffer with the ciphering key
[in]	iv	Init vector
[in]	direct	Direction: 0 (MS -> SGSN) or 1 (SGSN -> MS)

References _kasumi_kgcore(), and len.

Referenced by gea3().