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CCM* module now accepts fixed-size 13-byte nonces

Browse source 
also adjusted variable naming conventions in CCM* module
to use 'nonce' and 'iv' in line with RFC 3610 terminology
This commit is contained in:
Justin King-Lacroix 2015-06-29 22:51:00 +02:00
parent 3ce8f26eea
commit 30704e5afc
3 changed files with 39 additions and 48 deletions
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34
core/net/llsec/ccm-star-packetbuf.c
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@ -18,19 +18,19 @@ void ccm_star_mic_packetbuf(const uint8_t *extended_source_address,
uint8_t data_len = packetbuf_datalen();
uint8_t *headerptr = packetbuf_hdrptr();
uint8_t header_len = packetbuf_hdrlen();
uint8_t iv[13];
uint8_t nonce[CCM_STAR_NONCE_LENGTH];
memcpy(iv, extended_source_address, 8);
iv[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
iv[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
iv[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
iv[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
iv[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
memcpy(nonce, extended_source_address, 8);
nonce[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
nonce[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
nonce[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
nonce[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
nonce[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
if(packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL) & (1 << 2)) {
CCM_STAR.mic(dataptr, data_len, iv, 13, headerptr, header_len, result, mic_len);
CCM_STAR.mic(dataptr, data_len, nonce, headerptr, header_len, result, mic_len);
} else {
CCM_STAR.mic(dataptr, 0, iv, 13, headerptr, packetbuf_totlen(), result, mic_len);
CCM_STAR.mic(dataptr, 0, nonce, headerptr, packetbuf_totlen(), result, mic_len);
}
}
/*---------------------------------------------------------------------------*/
@ -38,15 +38,15 @@ void ccm_star_ctr_packetbuf(const uint8_t *extended_source_address)
{
uint8_t *dataptr = packetbuf_dataptr();
uint8_t data_len = packetbuf_datalen();
uint8_t iv[13];
uint8_t nonce[CCM_STAR_NONCE_LENGTH];
memcpy(iv, extended_source_address, 8);
iv[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
iv[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
iv[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
iv[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
iv[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
memcpy(nonce, extended_source_address, 8);
nonce[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
nonce[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
nonce[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
nonce[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
nonce[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
CCM_STAR.ctr(dataptr, data_len, iv, 13);
CCM_STAR.ctr(dataptr, data_len, nonce);
}
/*---------------------------------------------------------------------------*/