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implemented all security mangager crypto functions

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This commit is contained in:
matthias.ringwald@gmail.com 2013-11-09 19:59:05 +00:00
parent c686dfc823
commit 07b7ce8880
1 changed files with 76 additions and 3 deletions
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79
example/libusb/ble_server.c
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@ -114,6 +114,10 @@ static uint16_t att_response_handle = 0;
static uint16_t att_response_size = 0;
static uint8_t att_response_buffer[28];
// Security Manager Master Keys, please use sm_set_er(er) and sm_set_ir(ir) with your own 128 bit random values
static key_t sm_persistent_er;
static key_t sm_persistent_ir;
static uint16_t sm_response_handle = 0;
static uint16_t sm_response_size = 0;
static uint8_t sm_response_buffer[28];
@ -188,6 +192,23 @@ static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *pa
// SECURITY MANAGER (SM) MATERIALIZES HERE
void sm_init(){
// set some (BTstack default) ER and IR
int i;
for (i=0;i<16;i++){
sm_persistent_er[i] = 0x30 + i;
sm_persistent_ir[i] = 0x90 + i;
}
}
void sm_set_er(key_t er){
memcpy(sm_persistent_er, er, 16);
}
void sm_set_ir(key_t ir){
memcpy(sm_persistent_ir, ir, 16);
}
static inline void swap128(uint8_t src[16], uint8_t dst[16]){
int i;
for (i = 0; i < 16; i++)
@ -200,7 +221,7 @@ static inline void swap56(uint8_t src[7], uint8_t dst[7]){
dst[6 - i] = src[i];
}
static void sm_d1(key_t k, uint16_t d, uint16_t r){
static void sm_d1(key_t k, uint16_t d, uint16_t r, key_t d1){
// d'= padding || r || d
key_t d1_prime;
memset(d1_prime, 0, 16);
@ -209,8 +230,60 @@ static void sm_d1(key_t k, uint16_t d, uint16_t r){
// d1(k,d,r) = e(k, d'),
unsigned long rk[RKLENGTH(KEYBITS)];
int nrounds = rijndaelSetupEncrypt(rk, &k[0], KEYBITS);
key_t d1;
rijndaelEncrypt(rk, nrounds, k, d1);
rijndaelEncrypt(rk, nrounds, d1_prime, d1);
}
static uint16_t sm_dm(key_t k, uint8_t r[8]){
// r’ = padding || r
key_t r_prime;
memset(r_prime, 0, 16);
memcpy(&r_prime[8], r, 8);
// dm(k, r) = e(k, r’) dm(k, r) = e(k, r’)
key_t dm128;
unsigned long rk[RKLENGTH(KEYBITS)];
int nrounds = rijndaelSetupEncrypt(rk, &k[0], KEYBITS);
rijndaelEncrypt(rk, nrounds, r_prime, dm128);
uint16_t dm = READ_NET_16(dm128, 14);
return dm;
}
static uint16_t sm_y(key_t dhk, uint8_t rand[8]){
// Y = dm(DHK, Rand)
return sm_dm(dhk, rand);
}
static uint16_t sm_ediv(key_t dhk, uint8_t rand[8], uint16_t div){
// EDIV = Y xor DIV
uint16_t y = sm_y(dhk, rand);
uint16_t ediv = y ^ div;
return ediv;
}
static uint16_t sm_div(key_t dhk, uint8_t rand[8], uint16_t ediv){
// DIV = Y xor EDIV
uint16_t y = sm_y(dhk, rand);
uint16_t div = y ^ ediv;
return div;
}
static void sm_ltk(key_t er, uint16_t div, key_t ltk){
// LTK = d1(ER, DIV, 0))
sm_d1(er, div, 0, ltk);
}
static void sm_csrk(key_t er, uint16_t div, key_t csrk){
// LTK = d1(ER, DIV, 0))
sm_d1(er, div, 1, csrk);
}
static void sm_irk(key_t ir, key_t irk){
// IRK = d1(IR, 1, 0)
sm_d1(ir, 1, 0, irk);
}
static void sm_dhk(key_t ir, key_t dhk){
// DHK = d1(IR, 3, 0)
sm_d1(ir, 3, 0, dhk);
}
static void sm_c1(key_t k, key_t r, uint8_t preq[7], uint8_t pres[7], uint8_t iat, uint8_t rat, bd_addr_t ia, bd_addr_t ra, key_t c1){