Add security functions as specified in EN 300 175-7
Add the A{11,12,21,22} wrappers around the authentication algorithm, as
well as some key derivation helpers and some DSAA/DSC test vectors from
Annex K.
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
parent
3ee381b1c6
commit
0574e850f1
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@ -0,0 +1,39 @@
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#ifndef _LIBDECT_DECT_AUTH_H
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#define _LIBDECT_DECT_AUTH_H
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#define DECT_AUTH_KEY_LEN 16
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#define DECT_AUTH_RAND_LEN 8
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#define DECT_AUTH_RES_LEN 4
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#define DECT_CIPHER_KEY_LEN 8
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/**
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* struct dect_aalg - DECT authentication algorithm
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*
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* @type: algorithm ID
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* @d1_len: length of input D1
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* @d2_len: length of input D2
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* @calc: function to calculate output E
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*/
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struct dect_aalg {
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uint8_t type;
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unsigned int d1_len;
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unsigned int d2_len;
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void (*calc)(const uint8_t *d1, const uint8_t *d2,
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uint8_t *e);
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};
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extern const struct dect_aalg dect_dsaa_aalg;
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extern void dect_pin_to_ac(const char *pin, uint8_t *ac, unsigned int ac_len);
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extern void dect_auth_b1(const uint8_t *val, unsigned int len, uint8_t *k);
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extern void dect_auth_b2(const uint8_t *uak, unsigned int uak_len,
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const uint8_t *upi, unsigned int upi_len, uint8_t *k);
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extern void dect_auth_a11(const uint8_t *k, uint64_t rs, uint8_t *ks);
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extern void dect_auth_a12(const uint8_t *ks, uint64_t rand_f, uint8_t *dck,
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uint32_t *res1);
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extern void dect_auth_a21(const uint8_t *k, uint64_t rs, uint8_t *ks);
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extern void dect_auth_a22(const uint8_t *ks, uint64_t rand_p, uint32_t *res2);
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#endif /* _LIBDECT_DECT_AUTH_H */
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@ -11,6 +11,7 @@ dect-obj += cc.o
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dect-obj += ss.o
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dect-obj += mm.o
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dect-obj += keypad.o
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dect-obj += auth.o
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dect-obj += dsaa.o
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dect-obj += netlink.o
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dect-obj += utils.o
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@ -0,0 +1,221 @@
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/*
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* DECT Security processes and related functions
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*
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* Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <asm/byteorder.h>
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#include <dect/auth.h>
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#include <libdect.h>
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#include <utils.h>
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/**
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* dect_pin_to_ac - convert PIN to authentication code
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*
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* @pin: PIN code
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* @ac: buffer to store authentication code
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* @ac_len: length of destination buffer
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*
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* Convert a PIN to an authentication code, which is the BCD encoded PIN,
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* left-padded with 0xf. The number of PIN digits must not exceed 2 * ac_len.
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*/
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void dect_pin_to_ac(const char *pin, uint8_t *ac, unsigned int ac_len)
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{
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unsigned int i, shift, len;
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memset(ac, 0xff, ac_len);
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len = strlen(pin);
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for (i = 0; i < len; i++) {
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shift = i & 0x1 ? 4 : 0;
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ac[ac_len - i / 2 - 1] &= ~(0xf << shift);
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ac[ac_len - i / 2 - 1] |= (pin[len - i - 1] - '0') << shift;
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}
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}
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/**
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* dect_auth_b1 - derive authentication key K from UAK/AC
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*
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* @val: user authentication key (UAK) or authentication code (AC)
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* @len: length of UAK/AC
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* @k: buffer to store authentication key of size DECT_AUTH_KEY_LEN
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*
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* Derive an authentication key from a user authentication key or an
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* authentication code.
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*/
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void dect_auth_b1(const uint8_t *val, unsigned int len, uint8_t *k)
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{
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unsigned int i;
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for (i = 0; i < DECT_AUTH_KEY_LEN; i++)
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k[i] = val[i % len];
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}
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/**
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* dect_auth_b2 - derive authentication key K from UAK and UPI
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*
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* @uak: user authentication key (UAK)
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* @uak_len: length of UAK
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* @upi: user personal identity (UPI)
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* @upi_len: length of UPI
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* @k: buffer to store authentication key of size DECT_AUTH_KEY_LEN
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*
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* Derive an authentication key from a user authentication key and an user
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* personal identity.
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*/
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void dect_auth_b2(const uint8_t *uak, unsigned int uak_len,
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const uint8_t *upi, unsigned int upi_len, uint8_t *k)
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{
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unsigned int i;
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for (i = 0; i < DECT_AUTH_KEY_LEN; i++)
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k[i] = uak[i % uak_len] ^ upi[i % upi_len];
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}
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static void dect_auth_calc(const uint8_t *key, uint64_t val, uint8_t *e)
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{
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const struct dect_aalg *aalg = &dect_dsaa_aalg;
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uint8_t d1[aalg->d1_len];
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uint8_t d2[aalg->d2_len];
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unsigned int i;
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for (i = 0; i < aalg->d1_len; i++)
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d1[i] = key[i % DECT_AUTH_KEY_LEN];
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for (i = 0; i < aalg->d2_len; i++)
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d2[i] = val >> (i % sizeof(val) * 8);
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aalg->calc(d1, d2, e);
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}
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/**
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* dect_auth_a11 - derive authentication session key
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*
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* @k: authentication key K
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* @rs: random seed
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* @ks: buffer to store session authentication key of size DECT_AUTH_KEY_LEN
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*
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* Derive the session authentication keys KS from the authentication key K
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* and random seed RS.
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*/
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void dect_auth_a11(const uint8_t *k, uint64_t rs, uint8_t *ks)
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{
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dect_auth_calc(k, rs, ks);
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}
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/**
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* dect_auth_a12 - derive cipher key and authentication response
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*
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* @ks: session authentication key KS
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* @rand_f: FP random value
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* @dck: buffer to store derived cipher key (DCK) of size DECT_CIPHER_KEY_LEN
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* @res1: buffer to store authentication response
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*
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* Derive the derived cipher key DCK and authentication response RES1 from the
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* session authentication key KS and the random value rand_f.
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*/
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void dect_auth_a12(const uint8_t *ks, uint64_t rand_f, uint8_t *dck, uint32_t *res1)
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{
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uint8_t e[DECT_AUTH_KEY_LEN];
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dect_auth_calc(ks, rand_f, e);
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memcpy(dck, e + 4, DECT_CIPHER_KEY_LEN);
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memcpy(res1, e + 12, DECT_AUTH_RES_LEN);
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}
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/**
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* dect_auth_a21 - derive authentication session key
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*
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* @k: authentication key K
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* @rs: random seed
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* @ks: buffer to store session authentication key of size DECT_AUTH_KEY_LEN
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*
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* Derive the session authentication keys KS' from the authentication key K
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* and random seed RS.
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*/
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void dect_auth_a21(const uint8_t *k, uint64_t rs, uint8_t *ks)
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{
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unsigned int i;
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dect_auth_a11(k, rs, ks);
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for (i = 0; i < DECT_AUTH_KEY_LEN; i++)
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ks[i] ^= 0xaa;
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}
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/**
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* dect_auth_a22 - derive authentication response
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*
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* @ks: session authentication key KS'
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* @rand_p: PP random value
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* @res2: buffer to store authentication response
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*
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* Derive the authentication response RES2 from the session authentication
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* key KS' and the random value rand_p.
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*/
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void dect_auth_a22(const uint8_t *ks, uint64_t rand_p, uint32_t *res2)
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{
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uint8_t e[DECT_AUTH_KEY_LEN];
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dect_auth_calc(ks, rand_p, e);
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memcpy(res2, e + 12, DECT_AUTH_RES_LEN);
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}
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/*
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* DSAA/DSC key allocation test from ETS EN 300 175-7 Annex K
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*/
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#define DECT_AUTH_TEST_RS1 __cpu_to_be64(0)
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#define DECT_AUTH_TEST_RAND1 __cpu_to_be64(0xd01ff9e211680421)
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#define DECT_AUTH_TEST_RES1 0xf28cf911
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#define DECT_AUTH_TEST_RAND2 __cpu_to_be64(0xa03ff2c523d00842)
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#define DECT_AUTH_TEST_RES2 0xeeba4db9
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#define DECT_AUTH_TEST_RS2 __cpu_to_be64(0)
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#define DECT_AUTH_TEST_RAND3 __cpu_to_be64(0x9b114f2554518859)
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#define DECT_AUTH_TEST_RES3 0x961b3a9f
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#define DECT_AUTH_TEST_DCK 0x8560dc324ea49f37
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static void __init dect_auth_test(void)
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{
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uint8_t k[DECT_AUTH_KEY_LEN];
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uint8_t ks[DECT_AUTH_KEY_LEN], ks_[DECT_AUTH_KEY_LEN];
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uint8_t dck[DECT_CIPHER_KEY_LEN];
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uint32_t res1, res2;
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uint8_t ac[4];
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/* Authentication code "9124" */
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dect_pin_to_ac("9124", ac, sizeof(ac));
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dect_auth_b1(ac, sizeof(ac), k);
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/* FT auth request */
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dect_auth_a11(k, DECT_AUTH_TEST_RS1, ks);
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dect_auth_a12(ks, DECT_AUTH_TEST_RAND1, dck, &res1);
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if (__be32_to_cpu(res1) != DECT_AUTH_TEST_RES1)
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printf("dect_auth_test: fail1 res1=%.8x\n", res1);
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/* PT auth request + UAK allocation (UAK = KS') */
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dect_auth_a21(k, DECT_AUTH_TEST_RS1, ks_);
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dect_auth_a22(ks_, DECT_AUTH_TEST_RAND2, &res2);
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if (__cpu_to_be32(res2) != DECT_AUTH_TEST_RES2)
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printf("dect_auth_test: fail2 res2=%.8x\n", res2);
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/* DCK allocation using UAK */
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dect_auth_a11(ks_, DECT_AUTH_TEST_RS2, ks_);
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dect_auth_a12(ks_, DECT_AUTH_TEST_RAND3, dck, &res1);
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if (__cpu_to_be32(res1) != DECT_AUTH_TEST_RES3)
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printf("dect_auth_test: fail3 res1=%.8x\n", res1);
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if (__cpu_to_be64(*(uint64_t *)dck) != DECT_AUTH_TEST_DCK)
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printf("dect_auth_test: fail4 dck=%.16" PRIx64 "\n",
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(uint64_t)__cpu_to_be64(*(uint64_t *)dck));
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}
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157
src/dsaa.c
157
src/dsaa.c
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@ -9,48 +9,53 @@
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <dect/auth.h>
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#include <libdect.h>
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#include <utils.h>
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static const uint8_t sbox[256] = {
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176, 104, 111, 246, 125, 232, 22, 133,
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57, 124, 127, 222, 67, 240, 89, 169,
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251, 128, 50, 174, 95, 37, 140, 245,
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148, 107, 216, 234, 136, 152, 194, 41,
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207, 58, 80, 150, 28, 8, 149, 244,
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130, 55, 10, 86, 44, 255, 79, 196,
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96, 165, 131, 33, 48, 248, 243, 40,
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250, 147, 73, 52, 66, 120, 191, 252,
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97, 198, 241, 167, 26, 83, 3, 77,
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134, 211, 4, 135, 126, 143, 160, 183,
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49, 179, 231, 14, 47, 204, 105, 195,
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192, 217, 200, 19, 220, 139, 1, 82,
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193, 72, 239, 175, 115, 221, 92, 46,
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25, 145, 223, 34, 213, 61, 13, 163,
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88, 129, 62, 253, 98, 68, 36, 45,
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182, 141, 90, 5, 23, 190, 39, 84,
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93, 157, 214, 173, 108, 237, 100, 206,
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242, 114, 63, 212, 70, 164, 16, 162,
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59, 137, 151, 76, 110, 116, 153, 228,
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227, 187, 238, 112, 0, 189, 101, 32,
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15, 122, 233, 158, 155, 199, 181, 99,
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230, 170, 225, 138, 197, 7, 6, 30,
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94, 29, 53, 56, 119, 20, 17, 226,
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185, 132, 24, 159, 42, 203, 218, 247,
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166, 178, 102, 123, 177, 156, 109, 106,
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249, 254, 202, 201, 168, 65, 188, 121,
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219, 184, 103, 186, 172, 54, 171, 146,
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75, 215, 229, 154, 118, 205, 21, 31,
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78, 74, 87, 113, 27, 85, 9, 81,
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51, 12, 180, 142, 43, 224, 208, 91,
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71, 117, 69, 64, 2, 209, 60, 236,
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35, 235, 11, 210, 161, 144, 38, 18,
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0xb0, 0x68, 0x6f, 0xf6, 0x7d, 0xe8, 0x16, 0x85,
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0x39, 0x7c, 0x7f, 0xde, 0x43, 0xf0, 0x59, 0xa9,
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0xfb, 0x80, 0x32, 0xae, 0x5f, 0x25, 0x8c, 0xf5,
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0x94, 0x6b, 0xd8, 0xea, 0x88, 0x98, 0xc2, 0x29,
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0xcf, 0x3a, 0x50, 0x96, 0x1c, 0x08, 0x95, 0xf4,
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0x82, 0x37, 0x0a, 0x56, 0x2c, 0xff, 0x4f, 0xc4,
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0x60, 0xa5, 0x83, 0x21, 0x30, 0xf8, 0xf3, 0x28,
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0xfa, 0x93, 0x49, 0x34, 0x42, 0x78, 0xbf, 0xfc,
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0x61, 0xc6, 0xf1, 0xa7, 0x1a, 0x53, 0x03, 0x4d,
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0x86, 0xd3, 0x04, 0x87, 0x7e, 0x8f, 0xa0, 0xb7,
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0x31, 0xb3, 0xe7, 0x0e, 0x2f, 0xcc, 0x69, 0xc3,
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0xc0, 0xd9, 0xc8, 0x13, 0xdc, 0x8b, 0x01, 0x52,
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0xc1, 0x48, 0xef, 0xaf, 0x73, 0xdd, 0x5c, 0x2e,
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0x19, 0x91, 0xdf, 0x22, 0xd5, 0x3d, 0x0d, 0xa3,
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0x58, 0x81, 0x3e, 0xfd, 0x62, 0x44, 0x24, 0x2d,
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0xb6, 0x8d, 0x5a, 0x05, 0x17, 0xbe, 0x27, 0x54,
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0x5d, 0x9d, 0xd6, 0xad, 0x6c, 0xed, 0x64, 0xce,
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0xf2, 0x72, 0x3f, 0xd4, 0x46, 0xa4, 0x10, 0xa2,
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0x3b, 0x89, 0x97, 0x4c, 0x6e, 0x74, 0x99, 0xe4,
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0xe3, 0xbb, 0xee, 0x70, 0x00, 0xbd, 0x65, 0x20,
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0x0f, 0x7a, 0xe9, 0x9e, 0x9b, 0xc7, 0xb5, 0x63,
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0xe6, 0xaa, 0xe1, 0x8a, 0xc5, 0x07, 0x06, 0x1e,
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0x5e, 0x1d, 0x35, 0x38, 0x77, 0x14, 0x11, 0xe2,
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0xb9, 0x84, 0x18, 0x9f, 0x2a, 0xcb, 0xda, 0xf7,
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0xa6, 0xb2, 0x66, 0x7b, 0xb1, 0x9c, 0x6d, 0x6a,
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0xf9, 0xfe, 0xca, 0xc9, 0xa8, 0x41, 0xbc, 0x79,
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0xdb, 0xb8, 0x67, 0xba, 0xac, 0x36, 0xab, 0x92,
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0x4b, 0xd7, 0xe5, 0x9a, 0x76, 0xcd, 0x15, 0x1f,
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0x4e, 0x4a, 0x57, 0x71, 0x1b, 0x55, 0x09, 0x51,
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0x33, 0x0c, 0xb4, 0x8e, 0x2b, 0xe0, 0xd0, 0x5b,
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0x47, 0x75, 0x45, 0x40, 0x02, 0xd1, 0x3c, 0xec,
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0x23, 0xeb, 0x0b, 0xd2, 0xa1, 0x90, 0x26, 0x12,
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};
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static void bitperm(uint8_t start, uint8_t step, uint8_t * key)
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static void bitperm(uint8_t start, uint8_t step, uint8_t *key)
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{
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static uint8_t copy[8];
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uint8_t copy[8];
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unsigned int i;
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memcpy(copy, key, 8);
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@ -64,66 +69,44 @@ static void bitperm(uint8_t start, uint8_t step, uint8_t * key)
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}
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}
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#if 0
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static void bitperm1(uint8_t * key)
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{
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bitperm(46, 35, key);
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}
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static void bitperm2(uint8_t * key)
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{
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bitperm(25, 47, key);
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}
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static void bitperm3(uint8_t * key)
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{
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bitperm(60, 27, key);
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}
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|
||||
static void bitperm4(uint8_t * key)
|
||||
{
|
||||
bitperm(55, 39, key);
|
||||
}
|
||||
#endif
|
||||
|
||||
static const uint8_t mix_factor[3][8] = {
|
||||
{2, 2, 2, 2, 3, 3, 3, 3},
|
||||
{2, 2, 3, 3, 2, 2, 3, 3},
|
||||
{2, 3, 2, 3, 2, 3, 2, 3},
|
||||
{ 2, 2, 2, 2, 3, 3, 3, 3},
|
||||
{ 2, 2, 3, 3, 2, 2, 3, 3},
|
||||
{ 2, 3, 2, 3, 2, 3, 2, 3},
|
||||
};
|
||||
|
||||
static const uint8_t mix_index[3][8] = {
|
||||
{4, 5, 6, 7, 0, 1, 2, 3},
|
||||
{2, 3, 0, 1, 6, 7, 4, 5},
|
||||
{1, 0, 3, 2, 5, 4, 7, 6},
|
||||
{ 4, 5, 6, 7, 0, 1, 2, 3},
|
||||
{ 2, 3, 0, 1, 6, 7, 4, 5},
|
||||
{ 1, 0, 3, 2, 5, 4, 7, 6},
|
||||
};
|
||||
|
||||
static void mix(uint8_t start, uint8_t alg, uint8_t * key)
|
||||
static void mix(uint8_t start, uint8_t alg, uint8_t *key)
|
||||
{
|
||||
unsigned int i;
|
||||
uint8_t copy[8];
|
||||
unsigned int i;
|
||||
|
||||
memcpy(copy, key, 8);
|
||||
for (i=0; i<8; i++)
|
||||
for (i = 0; i < 8; i++)
|
||||
key[i] = copy[mix_index[alg][i]] + mix_factor[alg][i] * copy[i];
|
||||
}
|
||||
|
||||
static void mix1(uint8_t * key)
|
||||
static void mix1(uint8_t *key)
|
||||
{
|
||||
mix(4, 0, key);
|
||||
}
|
||||
|
||||
static void mix2(uint8_t * key)
|
||||
static void mix2(uint8_t *key)
|
||||
{
|
||||
mix(2, 1, key);
|
||||
}
|
||||
|
||||
static void mix3(uint8_t * key)
|
||||
static void mix3(uint8_t *key)
|
||||
{
|
||||
mix(1, 2, key);
|
||||
}
|
||||
|
||||
static void sub(uint8_t * s, uint8_t * t)
|
||||
static void sub(uint8_t *s, uint8_t *t)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
|
|
@ -132,11 +115,11 @@ static void sub(uint8_t * s, uint8_t * t)
|
|||
}
|
||||
|
||||
/* return in s */
|
||||
static void cassable(uint8_t start, uint8_t step, uint8_t * t, uint8_t * s)
|
||||
static void cassable(uint8_t start, uint8_t step, uint8_t *t, uint8_t *s)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for(i = 0; i < 2; i++) {
|
||||
for (i = 0; i < 2; i++) {
|
||||
bitperm(start, step, t);
|
||||
sub(s, t);
|
||||
mix1(s);
|
||||
|
|
@ -152,9 +135,8 @@ static void cassable(uint8_t start, uint8_t step, uint8_t * t, uint8_t * s)
|
|||
}
|
||||
|
||||
/* return in rand, modifies key */
|
||||
static void step1(uint8_t * rand, uint8_t * key)
|
||||
static void step1(uint8_t *rand, uint8_t *key)
|
||||
{
|
||||
|
||||
uint8_t tmp[8];
|
||||
|
||||
memcpy(tmp, rand, 8);
|
||||
|
|
@ -165,9 +147,8 @@ static void step1(uint8_t * rand, uint8_t * key)
|
|||
memcpy(key, rand, 8);
|
||||
}
|
||||
|
||||
static void step2(uint8_t * rand, uint8_t * key)
|
||||
static void step2(uint8_t *rand, uint8_t *key)
|
||||
{
|
||||
|
||||
uint8_t tmp[8];
|
||||
|
||||
memcpy(tmp, rand, 8);
|
||||
|
|
@ -178,7 +159,7 @@ static void step2(uint8_t * rand, uint8_t * key)
|
|||
memcpy(key, rand, 8);
|
||||
}
|
||||
|
||||
static void rev(uint8_t * v, uint8_t n)
|
||||
static void rev(uint8_t *v, uint8_t n)
|
||||
{
|
||||
unsigned int i;
|
||||
uint8_t tmp;
|
||||
|
|
@ -190,17 +171,20 @@ static void rev(uint8_t * v, uint8_t n)
|
|||
}
|
||||
}
|
||||
|
||||
void dsaa_main(uint8_t * rand, uint8_t * key, uint8_t * out);
|
||||
void dsaa_main(uint8_t * rand, uint8_t * key, uint8_t * out)
|
||||
static void dsaa_main(const uint8_t *k, const uint8_t *r, uint8_t *e)
|
||||
{
|
||||
uint8_t key[16];
|
||||
uint8_t rand[8];
|
||||
uint8_t a[8];
|
||||
uint8_t b[8];
|
||||
|
||||
rev(rand, 8);
|
||||
memcpy(key, k, sizeof(key));
|
||||
rev(key, 16);
|
||||
|
||||
step1(rand, key + 4);
|
||||
memcpy(&rand, r, sizeof(rand));
|
||||
rev(rand, 8);
|
||||
|
||||
step1(rand, key + 4);
|
||||
memcpy(a, key + 4, 8);
|
||||
|
||||
memcpy(key + 4, key + 12, 4);
|
||||
|
|
@ -211,7 +195,14 @@ void dsaa_main(uint8_t * rand, uint8_t * key, uint8_t * out)
|
|||
rev(key, 4);
|
||||
rev(key + 4, 4);
|
||||
|
||||
memcpy(out, key + 4, 4);
|
||||
memcpy(out + 4, a, 8);
|
||||
memcpy(out + 12, key, 4);
|
||||
memcpy(e, key + 4, 4);
|
||||
memcpy(e + 4, a, 8);
|
||||
memcpy(e + 12, key, 4);
|
||||
}
|
||||
|
||||
const struct dect_aalg dect_dsaa_aalg = {
|
||||
.type = DECT_AUTH_DSAA,
|
||||
.d1_len = 16,
|
||||
.d2_len = 8,
|
||||
.calc = dsaa_main,
|
||||
};
|
||||
|
|
|
|||
Reference in New Issue