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btstack_crypto: provide auth_len for ccm init

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This commit is contained in:
Matthias Ringwald 2018-10-26 13:57:03 +02:00
parent 81132a3911
commit 6015e1edc2
2 changed files with 7 additions and 3 deletions
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6
src/btstack_crypto.c
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@ -364,7 +364,8 @@ static void btstack_crypto_ccm_setup_a_i(btstack_crypto_ccm_t * btstack_crypto_c
*/
static void btstack_crypto_ccm_setup_b_0(btstack_crypto_ccm_t * btstack_crypto_ccm, uint8_t * b0){
b0[0] = (3 << 3) | 1 ; // Adata = 0, M' = (M-2)/2, L' = L - 1
uint8_t m_prime = (btstack_crypto_ccm->auth_len - 2) / 2;
b0[0] = (m_prime << 3) | 1 ; // Adata = 0, M', L' = L - 1
memcpy(&b0[1], btstack_crypto_ccm->nonce, 13);
big_endian_store_16(b0, 14, btstack_crypto_ccm->message_len);
}
@ -997,10 +998,11 @@ int btstack_crypto_ecc_p256_validate_public_key(const uint8_t * public_key){
}
#endif
void btstack_crypo_ccm_init(btstack_crypto_ccm_t * request, const uint8_t * key, const uint8_t * nonce, uint16_t message_len){
void btstack_crypo_ccm_init(btstack_crypto_ccm_t * request, const uint8_t * key, const uint8_t * nonce, uint16_t message_len, uint8_t auth_len){
request->key = key;
request->nonce = nonce;
request->message_len = message_len;
request->auth_len = auth_len;
request->counter = 1;
}

4
src/btstack_crypto.h
View File

@ -121,6 +121,7 @@ typedef struct {
uint16_t message_len;
uint16_t block_len;
uint16_t counter;
uint8_t auth_len;
} btstack_crypto_ccm_t;
/**
@ -219,8 +220,9 @@ int btstack_crypto_ecc_p256_validate_public_key(const uint8_t * public_key);
* @param nonce
* @param key
* @param message_len
* @param auth_len
*/
void btstack_crypo_ccm_init(btstack_crypto_ccm_t * request, const uint8_t * key, const uint8_t * nonce, uint16_t message_len);
void btstack_crypo_ccm_init(btstack_crypto_ccm_t * request, const uint8_t * key, const uint8_t * nonce, uint16_t message_len, uint8_t auth_len);
/**
* Get authentication value (M=8) after encrypt or decrypt operation