This is a followup to commits 79fd24af1 45beec16b and 37bbe30c9,
continuing a cleanup of mesh/crypto.
This version works with unit tests added in 06cf0fd1c.
Michał Lowas-Rzechonek (1):
mesh: Refactor mesh/crypto
mesh/crypto.c | 481 ++++++++++++++++------------------------
mesh/crypto.h | 50 +----
mesh/net-keys.c | 2 +-
unit/test-mesh-crypto.c | 205 ++++++++---------
4 files changed, 291 insertions(+), 447 deletions(-)
--
2.20.1
This patch streamlines the crypto implementation to keep function names
and argument naming/order consistent:
- Remove application_encrypt/application_decrypt
- Make *_nonce functions private and align their implementation to be
more consistent
- Make mesh_crypto_privacy_counter private, add mesh_crypto_pecb
- Refactor network_encrypt/network_decrypt to use *_nonce functions and
rename them to packet_encrypt/packet_decrypt
- Refactor packet_encode/packet_decode
---
mesh/crypto.c | 481 ++++++++++++++++------------------------
mesh/crypto.h | 50 +----
mesh/net-keys.c | 2 +-
unit/test-mesh-crypto.c | 205 ++++++++---------
4 files changed, 291 insertions(+), 447 deletions(-)
diff --git a/mesh/crypto.c b/mesh/crypto.c
index 8ea906ac9..fbfb20a7a 100644
--- a/mesh/crypto.c
+++ b/mesh/crypto.c
@@ -327,144 +327,59 @@ bool mesh_crypto_beacon_cmac(const uint8_t encryption_key[16],
return true;
}
-bool mesh_crypto_network_nonce(bool ctl, uint8_t ttl, uint32_t seq,
- uint16_t src, uint32_t iv_index,
- uint8_t nonce[13])
+static void mesh_crypto_network_nonce(bool ctl, uint8_t ttl,
+ uint32_t seq, uint16_t src,
+ uint32_t iv_index, uint8_t nonce[13])
{
- nonce[0] = 0;
+ nonce[0] = 0x00;
nonce[1] = (ttl & TTL_MASK) | (ctl ? CTL : 0x00);
nonce[2] = (seq >> 16) & 0xff;
nonce[3] = (seq >> 8) & 0xff;
nonce[4] = seq & 0xff;
-
- /* SRC */
l_put_be16(src, nonce + 5);
-
l_put_be16(0, nonce + 7);
-
- /* IV Index */
l_put_be32(iv_index, nonce + 9);
-
- return true;
-}
-
-bool mesh_crypto_network_encrypt(bool ctl, uint8_t ttl,
- uint32_t seq, uint16_t src,
- uint32_t iv_index,
- const uint8_t net_key[16],
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *net_mic)
-{
- uint8_t nonce[13];
-
- if (!mesh_crypto_network_nonce(ctl, ttl, seq, src, iv_index, nonce))
- return false;
-
- return mesh_crypto_aes_ccm_encrypt(nonce, net_key, NULL, 0, enc_msg,
- enc_msg_len, out, net_mic,
- ctl ? 8 : 4);
}
-bool mesh_crypto_network_decrypt(bool ctl, uint8_t ttl,
- uint32_t seq, uint16_t src,
- uint32_t iv_index,
- const uint8_t net_key[16],
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *net_mic, size_t mic_size)
-{
- uint8_t nonce[13];
-
- if (!mesh_crypto_network_nonce(ctl, ttl, seq, src, iv_index, nonce))
- return false;
-
- return mesh_crypto_aes_ccm_decrypt(nonce, net_key, NULL, 0,
- enc_msg, enc_msg_len, out,
- net_mic, mic_size);
-}
-
-bool mesh_crypto_application_nonce(uint32_t seq, uint16_t src,
+static void mesh_crypto_application_nonce(uint32_t seq, uint16_t src,
uint16_t dst, uint32_t iv_index,
bool aszmic, uint8_t nonce[13])
{
nonce[0] = 0x01;
nonce[1] = aszmic ? 0x80 : 0x00;
- nonce[2] = (seq & 0x00ff0000) >> 16;
- nonce[3] = (seq & 0x0000ff00) >> 8;
- nonce[4] = (seq & 0x000000ff);
- nonce[5] = (src & 0xff00) >> 8;
- nonce[6] = (src & 0x00ff);
- nonce[7] = (dst & 0xff00) >> 8;
- nonce[8] = (dst & 0x00ff);
+ nonce[2] = (seq >> 16 ) & 0xff;
+ nonce[3] = (seq >> 8) & 0xff;
+ nonce[4] = seq & 0xff;
+ l_put_be16(src, nonce + 5);
+ l_put_be16(dst, nonce + 7);
l_put_be32(iv_index, nonce + 9);
-
- return true;
}
-bool mesh_crypto_device_nonce(uint32_t seq, uint16_t src,
+static void mesh_crypto_device_nonce(uint32_t seq, uint16_t src,
uint16_t dst, uint32_t iv_index,
bool aszmic, uint8_t nonce[13])
{
nonce[0] = 0x02;
nonce[1] = aszmic ? 0x80 : 0x00;
- nonce[2] = (seq & 0x00ff0000) >> 16;
- nonce[3] = (seq & 0x0000ff00) >> 8;
- nonce[4] = (seq & 0x000000ff);
- nonce[5] = (src & 0xff00) >> 8;
- nonce[6] = (src & 0x00ff);
- nonce[7] = (dst & 0xff00) >> 8;
- nonce[8] = (dst & 0x00ff);
+ nonce[2] = (seq >> 16 ) & 0xff;
+ nonce[3] = (seq >> 8) & 0xff;
+ nonce[4] = seq & 0xff;
+ l_put_be16(src, nonce + 5);
+ l_put_be16(dst, nonce + 7);
l_put_be32(iv_index, nonce + 9);
-
- return true;
}
-bool mesh_crypto_application_encrypt(uint8_t key_aid, uint32_t seq,
- uint16_t src, uint16_t dst,
- uint32_t iv_index,
- const uint8_t app_key[16],
- const uint8_t *aad, uint8_t aad_len,
- const uint8_t *msg, uint8_t msg_len,
- uint8_t *out,
- void *app_mic, size_t mic_size)
+static void mesh_crypto_proxy_nonce(uint32_t seq, uint16_t src,
+ uint32_t iv_index, uint8_t nonce[13])
{
- uint8_t nonce[13];
- bool aszmic = (mic_size == 8) ? true : false;
-
- if (!key_aid && !mesh_crypto_device_nonce(seq, src, dst,
- iv_index, aszmic, nonce))
- return false;
-
- if (key_aid && !mesh_crypto_application_nonce(seq, src, dst,
- iv_index, aszmic, nonce))
- return false;
-
- return mesh_crypto_aes_ccm_encrypt(nonce, app_key, aad, aad_len,
- msg, msg_len,
- out, app_mic, mic_size);
-}
-
-bool mesh_crypto_application_decrypt(uint8_t key_aid, uint32_t seq,
- uint16_t src, uint16_t dst, uint32_t iv_index,
- const uint8_t app_key[16],
- const uint8_t *aad, uint8_t aad_len,
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *app_mic, size_t mic_size)
-{
- uint8_t nonce[13];
- bool aszmic = (mic_size == 8) ? true : false;
-
- if (!key_aid && !mesh_crypto_device_nonce(seq, src, dst,
- iv_index, aszmic, nonce))
- return false;
-
- if (key_aid && !mesh_crypto_application_nonce(seq, src, dst,
- iv_index, aszmic, nonce))
- return false;
-
- return mesh_crypto_aes_ccm_decrypt(nonce, app_key,
- aad, aad_len, enc_msg,
- enc_msg_len, out,
- app_mic, mic_size);
+ nonce[0] = 0x03;
+ nonce[1] = 0;
+ nonce[2] = (seq >> 16) & 0xff;
+ nonce[3] = (seq >> 8) & 0xff;
+ nonce[4] = seq & 0xff;
+ l_put_be16(src, nonce + 5);
+ l_put_be16(0, nonce + 7);
+ l_put_be32(iv_index, nonce + 9);
}
bool mesh_crypto_session_key(const uint8_t secret[32],
@@ -557,69 +472,67 @@ bool mesh_crypto_virtual_addr(const uint8_t virtual_label[16],
return true;
}
-bool mesh_crypto_privacy_counter(uint32_t iv_index,
+static void mesh_crypto_privacy_counter(uint32_t iv_index,
const uint8_t *payload,
uint8_t privacy_counter[16])
{
memset(privacy_counter, 0, 5);
l_put_be32(iv_index, privacy_counter + 5);
memcpy(privacy_counter + 9, payload, 7);
+}
- return true;
+static bool mesh_crypto_pecb(const uint8_t privacy_key[16],
+ uint32_t iv_index,
+ const uint8_t *payload,
+ uint8_t pecb[16])
+{
+ mesh_crypto_privacy_counter(iv_index, payload, pecb);
+ return aes_ecb_one(privacy_key, pecb, pecb);
}
-bool mesh_crypto_network_obfuscate(const uint8_t privacy_key[16],
- const uint8_t privacy_counter[16],
- bool ctl, uint8_t ttl, uint32_t seq,
- uint16_t src, uint8_t *out)
+static bool mesh_crypto_network_obfuscate(uint8_t *packet,
+ const uint8_t privacy_key[16],
+ uint32_t iv_index,
+ bool ctl, uint8_t ttl,
+ uint32_t seq, uint16_t src)
{
- uint8_t ecb[16], tmp[16];
+ uint8_t pecb[16];
+ uint8_t *net_hdr = packet + 1;
int i;
- if (!aes_ecb_one(privacy_key, privacy_counter, ecb))
+ if (!mesh_crypto_pecb(privacy_key, iv_index, packet + 7, pecb))
return false;
- tmp[0] = ((!!ctl) << 7) | (ttl & TTL_MASK);
- tmp[1] = (seq & 0xff0000) >> 16;
- tmp[2] = (seq & 0x00ff00) >> 8;
- tmp[3] = (seq & 0x0000ff);
- tmp[4] = (src & 0xff00) >> 8;
- tmp[5] = (src & 0x00ff);
+ l_put_be16(src, net_hdr + 4);
+ l_put_be32(seq & SEQ_MASK, net_hdr);
+ net_hdr[0] = ((!!ctl) << 7) | (ttl & TTL_MASK);
- if (out) {
- for (i = 0; i < 6; i++)
- out[i] = ecb[i] ^ tmp[i];
- }
+ for (i = 0; i < 6; i++)
+ net_hdr[i] = pecb[i] ^ net_hdr[i];
return true;
}
-bool mesh_crypto_network_clarify(const uint8_t privacy_key[16],
- const uint8_t privacy_counter[16],
- const uint8_t net_hdr[6],
- bool *ctl, uint8_t *ttl,
- uint32_t *seq, uint16_t *src)
+static bool mesh_crypto_network_clarify(uint8_t *packet,
+ const uint8_t privacy_key[16],
+ uint32_t iv_index,
+ bool *ctl, uint8_t *ttl,
+ uint32_t *seq, uint16_t *src)
{
- uint8_t ecb[16], tmp[6];
+ uint8_t pecb[16];
+ uint8_t *net_hdr = packet + 1;
int i;
- if (!aes_ecb_one(privacy_key, privacy_counter, ecb))
+ if (!mesh_crypto_pecb(privacy_key, iv_index, packet + 7, pecb))
return false;
for (i = 0; i < 6; i++)
- tmp[i] = ecb[i] ^ net_hdr[i];
-
- if (ctl)
- *ctl = !!(tmp[0] & CTL);
+ net_hdr[i] = pecb[i] ^ net_hdr[i];
- if (ttl)
- *ttl = tmp[0] & TTL_MASK;
-
- if (seq)
- *seq = l_get_be32(tmp) & SEQ_MASK;
-
- if (src)
- *src = l_get_be16(tmp + 4);
+ *src = l_get_be16(net_hdr + 4);
+ *seq = l_get_be32(net_hdr) & SEQ_MASK;
+ *ttl = net_hdr[0] & TTL_MASK;
+ *ctl = !!(net_hdr[0] & CTL);
return true;
}
@@ -686,24 +599,13 @@ bool mesh_crypto_packet_build(bool ctl, uint8_t ttl,
return true;
}
-bool mesh_crypto_packet_parse(const uint8_t *packet, uint8_t packet_len,
+static bool network_header_parse(const uint8_t *packet, uint8_t packet_len,
bool *ctl, uint8_t *ttl, uint32_t *seq,
- uint16_t *src, uint16_t *dst,
- uint32_t *cookie, uint8_t *opcode,
- bool *segmented, uint8_t *key_aid,
- bool *szmic, bool *relay, uint16_t *seqZero,
- uint8_t *segO, uint8_t *segN,
- const uint8_t **payload, uint8_t *payload_len)
+ uint16_t *src, uint16_t *dst)
{
- uint32_t hdr;
- uint16_t this_dst;
- bool is_segmented;
-
if (packet_len < 10)
return false;
- this_dst = l_get_be16(packet + 7);
-
/* Try to keep bits in the order they exist within the packet */
if (ctl)
*ctl = !!(packet[1] & CTL);
@@ -717,6 +619,30 @@ bool mesh_crypto_packet_parse(const uint8_t *packet, uint8_t packet_len,
if (src)
*src = l_get_be16(packet + 5);
+ if (dst)
+ *dst = l_get_be16(packet + 7);
+
+ return true;
+
+}
+
+bool mesh_crypto_packet_parse(const uint8_t *packet, uint8_t packet_len,
+ bool *ctl, uint8_t *ttl, uint32_t *seq,
+ uint16_t *src, uint16_t *dst,
+ uint32_t *cookie, uint8_t *opcode,
+ bool *segmented, uint8_t *key_aid,
+ bool *szmic, bool *relay, uint16_t *seqZero,
+ uint8_t *segO, uint8_t *segN,
+ const uint8_t **payload, uint8_t *payload_len)
+{
+ uint32_t hdr;
+ uint16_t this_dst;
+ bool is_segmented;
+
+ if (!network_header_parse(packet, packet_len,
+ ctl, ttl, seq, src, &this_dst))
+ return false;
+
if (dst)
*dst = this_dst;
@@ -796,38 +722,27 @@ bool mesh_crypto_packet_parse(const uint8_t *packet, uint8_t packet_len,
bool mesh_crypto_payload_encrypt(uint8_t *aad, const uint8_t *payload,
uint8_t *out, uint16_t payload_len,
uint16_t src, uint16_t dst, uint8_t key_aid,
- uint32_t seq_num, uint32_t iv_index,
+ uint32_t seq, uint32_t iv_index,
bool aszmic,
- const uint8_t application_key[16])
+ const uint8_t app_key[16])
{
- uint8_t application_nonce[13] = { 0x01, };
+ uint8_t nonce[13];
if (payload_len < 1)
return false;
if (key_aid == APP_AID_DEV)
- application_nonce[0] = 0x02;
-
- /* Seq Num */
- l_put_be32(seq_num, application_nonce + 1);
-
- /* ASZMIC */
- application_nonce[1] |= aszmic ? 0x80 : 0x00;
-
- /* SRC */
- l_put_be16(src, application_nonce + 5);
-
- /* DST */
- l_put_be16(dst, application_nonce + 7);
-
- /* IV Index */
- l_put_be32(iv_index, application_nonce + 9);
-
- if (!mesh_crypto_aes_ccm_encrypt(application_nonce, application_key,
- aad, aad ? 16 : 0,
- payload, payload_len,
- out, NULL,
- aszmic ? 8 : 4))
+ mesh_crypto_device_nonce(seq, src, dst, iv_index, aszmic,
+ nonce);
+ else
+ mesh_crypto_application_nonce(seq, src, dst, iv_index, aszmic,
+ nonce);
+
+ if (!mesh_crypto_aes_ccm_encrypt(nonce, app_key,
+ aad, aad ? 16 : 0,
+ payload, payload_len,
+ out, NULL,
+ aszmic ? 8 : 4))
return false;
return true;
@@ -835,13 +750,13 @@ bool mesh_crypto_payload_encrypt(uint8_t *aad, const uint8_t *payload,
bool mesh_crypto_payload_decrypt(uint8_t *aad, uint16_t aad_len,
const uint8_t *payload, uint16_t payload_len,
- bool szmict,
+ bool aszmic,
uint16_t src, uint16_t dst,
- uint8_t key_aid, uint32_t seq_num,
+ uint8_t key_aid, uint32_t seq,
uint32_t iv_index, uint8_t *out,
const uint8_t app_key[16])
{
- uint8_t app_nonce[13] = { 0x01, };
+ uint8_t nonce[13];
uint32_t mic32;
uint64_t mic64;
@@ -849,27 +764,16 @@ bool mesh_crypto_payload_decrypt(uint8_t *aad, uint16_t aad_len,
return false;
if (key_aid == APP_AID_DEV)
- app_nonce[0] = 0x02;
-
- /* Seq Num */
- l_put_be32(seq_num, app_nonce + 1);
-
- /* ASZMIC */
- app_nonce[1] |= szmict ? 0x80 : 0x00;
-
- /* SRC */
- l_put_be16(src, app_nonce + 5);
-
- /* DST */
- l_put_be16(dst, app_nonce + 7);
-
- /* IV Index */
- l_put_be32(iv_index, app_nonce + 9);
+ mesh_crypto_device_nonce(seq, src, dst, iv_index, aszmic,
+ nonce);
+ else
+ mesh_crypto_application_nonce(seq, src, dst, iv_index, aszmic,
+ nonce);
memcpy(out, payload, payload_len);
- if (szmict) {
- if (!mesh_crypto_aes_ccm_decrypt(app_nonce, app_key,
+ if (aszmic) {
+ if (!mesh_crypto_aes_ccm_decrypt(nonce, app_key,
aad, aad_len,
payload, payload_len,
out, &mic64, sizeof(mic64)))
@@ -881,7 +785,7 @@ bool mesh_crypto_payload_decrypt(uint8_t *aad, uint16_t aad_len,
if (mic64)
return false;
} else {
- if (!mesh_crypto_aes_ccm_decrypt(app_nonce, app_key,
+ if (!mesh_crypto_aes_ccm_decrypt(nonce, app_key,
aad, aad_len,
payload, payload_len,
out, &mic32, sizeof(mic32)))
@@ -897,146 +801,107 @@ bool mesh_crypto_payload_decrypt(uint8_t *aad, uint16_t aad_len,
return true;
}
-bool mesh_crypto_packet_encode(uint8_t *packet, uint8_t packet_len,
+static bool mesh_crypto_packet_encrypt(uint8_t *packet, uint8_t packet_len,
const uint8_t network_key[16],
- uint32_t iv_index,
- const uint8_t privacy_key[16])
+ uint32_t iv_index, bool proxy,
+ bool ctl, uint8_t ttl, uint32_t seq,
+ uint16_t src)
{
- uint8_t network_nonce[13] = { 0x00, 0x00 };
- uint8_t privacy_counter[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, };
- uint8_t tmp[16];
- int i;
-
- if (packet_len < 14)
- return false;
+ uint8_t nonce[13];
/* Detect Proxy packet by CTL == true && DST == 0x0000 */
- if ((packet[1] & CTL) && l_get_be16(packet + 7) == 0)
- network_nonce[0] = 0x03; /* Proxy Nonce */
+ if (ctl && proxy)
+ mesh_crypto_proxy_nonce(seq, src, iv_index, nonce);
else
- /* CTL + TTL */
- network_nonce[1] = packet[1];
-
- /* Seq Num */
- network_nonce[2] = packet[2];
- network_nonce[3] = packet[3];
- network_nonce[4] = packet[4];
-
- /* SRC */
- network_nonce[5] = packet[5];
- network_nonce[6] = packet[6];
-
- /* DST not available */
- network_nonce[7] = 0;
- network_nonce[8] = 0;
-
- /* IV Index */
- l_put_be32(iv_index, network_nonce + 9);
+ mesh_crypto_network_nonce(ctl, ttl, seq, src, iv_index, nonce);
/* Check for Long net-MIC */
- if (packet[1] & CTL) {
- if (!mesh_crypto_aes_ccm_encrypt(network_nonce, network_key,
+ if (ctl) {
+ if (!mesh_crypto_aes_ccm_encrypt(nonce, network_key,
NULL, 0,
packet + 7, packet_len - 7 - 8,
packet + 7, NULL, 8))
return false;
} else {
- if (!mesh_crypto_aes_ccm_encrypt(network_nonce, network_key,
+ if (!mesh_crypto_aes_ccm_encrypt(nonce, network_key,
NULL, 0,
packet + 7, packet_len - 7 - 4,
packet + 7, NULL, 4))
return false;
}
- l_put_be32(iv_index, privacy_counter + 5);
- memcpy(privacy_counter + 9, packet + 7, 7);
-
- if (!aes_ecb_one(privacy_key, privacy_counter, tmp))
- return false;
-
- for (i = 0; i < 6; i++)
- packet[1 + i] ^= tmp[i];
-
return true;
}
-bool mesh_crypto_packet_decode(const uint8_t *packet, uint8_t packet_len,
- bool proxy, uint8_t *out, uint32_t iv_index,
+bool mesh_crypto_packet_encode(uint8_t *packet, uint8_t packet_len,
+ uint32_t iv_index,
const uint8_t network_key[16],
const uint8_t privacy_key[16])
{
- uint8_t privacy_counter[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, };
- uint8_t network_nonce[13] = { 0x00, 0x00, };
- uint8_t tmp[16];
+ bool ctl;
+ uint8_t ttl;
+ uint32_t seq;
uint16_t src;
- int i;
+ uint16_t dst;
- if (packet_len < 14)
+ if (!network_header_parse(packet, packet_len,
+ &ctl, &ttl, &seq, &src, &dst))
return false;
- l_put_be32(iv_index, privacy_counter + 5);
- memcpy(privacy_counter + 9, packet + 7, 7);
+ if (!mesh_crypto_packet_encrypt(packet, packet_len, network_key,
+ iv_index, !dst,
+ ctl, ttl, seq, src))
- if (!aes_ecb_one(privacy_key, privacy_counter, tmp))
return false;
- memcpy(out, packet, packet_len);
- for (i = 0; i < 6; i++)
- out[1 + i] ^= tmp[i];
+ return mesh_crypto_network_obfuscate(packet, privacy_key, iv_index,
+ ctl, ttl, seq, src);
+}
- src = l_get_be16(out + 5);
+static bool mesh_crypto_packet_decrypt(uint8_t *packet, uint8_t packet_len,
+ const uint8_t network_key[16],
+ uint32_t iv_index, bool proxy,
+ bool ctl, uint8_t ttl, uint32_t seq,
+ uint16_t src)
+{
+ uint8_t nonce[13];
/* Pre-check SRC address for illegal values */
- if (!src || src >= 0x8000)
+ if (!IS_UNICAST(src))
return false;
/* Detect Proxy packet by CTL == true && proxy == true */
- if ((out[1] & CTL) && proxy)
- network_nonce[0] = 0x03; /* Proxy Nonce */
+ if (ctl & proxy)
+ mesh_crypto_proxy_nonce(seq, src, iv_index, nonce);
else
- /* CTL + TTL */
- network_nonce[1] = out[1];
-
- /* Seq Num */
- network_nonce[2] = out[2];
- network_nonce[3] = out[3];
- network_nonce[4] = out[4];
-
- /* SRC */
- network_nonce[5] = out[5];
- network_nonce[6] = out[6];
-
- /* DST not available */
- network_nonce[7] = 0;
- network_nonce[8] = 0;
-
- /* IV Index */
- l_put_be32(iv_index, network_nonce + 9);
+ mesh_crypto_network_nonce(ctl, ttl, seq, src, iv_index, nonce);
/* Check for Long MIC */
- if (out[1] & CTL) {
+ if (ctl) {
uint64_t mic;
- if (!mesh_crypto_aes_ccm_decrypt(network_nonce, network_key,
- NULL, 0, packet + 7, packet_len - 7,
- out + 7, &mic, sizeof(mic)))
+ if (!mesh_crypto_aes_ccm_decrypt(nonce, network_key,
+ NULL, 0,
+ packet + 7, packet_len - 7,
+ packet + 7, &mic, sizeof(mic)))
return false;
- mic ^= l_get_be64(out + packet_len - 8);
- l_put_be64(mic, out + packet_len - 8);
+ mic ^= l_get_be64(packet + packet_len - 8);
+ l_put_be64(mic, packet + packet_len - 8);
if (mic)
return false;
} else {
uint32_t mic;
- if (!mesh_crypto_aes_ccm_decrypt(network_nonce, network_key,
- NULL, 0, packet + 7, packet_len - 7,
- out + 7, &mic, sizeof(mic)))
+ if (!mesh_crypto_aes_ccm_decrypt(nonce, network_key,
+ NULL, 0,
+ packet + 7, packet_len - 7,
+ packet + 7, &mic, sizeof(mic)))
return false;
- mic ^= l_get_be32(out + packet_len - 4);
- l_put_be32(mic, out + packet_len - 4);
+ mic ^= l_get_be32(packet + packet_len - 4);
+ l_put_be32(mic, packet + packet_len - 4);
if (mic)
return false;
@@ -1045,6 +910,30 @@ bool mesh_crypto_packet_decode(const uint8_t *packet, uint8_t packet_len,
return true;
}
+bool mesh_crypto_packet_decode(const uint8_t *packet, uint8_t packet_len,
+ bool proxy, uint8_t *out, uint32_t iv_index,
+ const uint8_t network_key[16],
+ const uint8_t privacy_key[16])
+{
+ bool ctl;
+ uint8_t ttl;
+ uint32_t seq;
+ uint16_t src;
+
+ if (packet_len < 14)
+ return false;
+
+ memcpy(out, packet, packet_len);
+
+ if (!mesh_crypto_network_clarify(out, privacy_key, iv_index,
+ &ctl, &ttl, &seq, &src))
+ return false;
+
+ return mesh_crypto_packet_decrypt(out, packet_len, network_key,
+ iv_index, proxy,
+ ctl, ttl, seq, src);
+}
+
bool mesh_crypto_packet_label(uint8_t *packet, uint8_t packet_len,
uint16_t iv_index, uint8_t network_id)
{
diff --git a/mesh/crypto.h b/mesh/crypto.h
index e5ce840b4..7d3f89cde 100644
--- a/mesh/crypto.h
+++ b/mesh/crypto.h
@@ -19,6 +19,7 @@
#include <stdbool.h>
#include <stdint.h>
+#include <stdlib.h>
bool mesh_crypto_aes_ccm_encrypt(const uint8_t nonce[13], const uint8_t key[16],
const uint8_t *aad, uint16_t aad_len,
@@ -41,40 +42,6 @@ bool mesh_crypto_beacon_cmac(const uint8_t encryption_key[16],
const uint8_t network_id[16],
uint32_t iv_index, bool kr,
bool iu, uint64_t *cmac);
-bool mesh_crypto_network_nonce(bool frnd, uint8_t ttl, uint32_t seq,
- uint16_t src, uint32_t iv_index,
- uint8_t nonce[13]);
-bool mesh_crypto_network_encrypt(bool ctl, uint8_t ttl,
- uint32_t seq, uint16_t src,
- uint32_t iv_index,
- const uint8_t net_key[16],
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *net_mic);
-bool mesh_crypto_network_decrypt(bool frnd, uint8_t ttl,
- uint32_t seq, uint16_t src,
- uint32_t iv_index,
- const uint8_t net_key[16],
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *net_mic, size_t mic_size);
-bool mesh_crypto_application_nonce(uint32_t seq, uint16_t src,
- uint16_t dst, uint32_t iv_index,
- bool aszmic, uint8_t nonce[13]);
-bool mesh_crypto_device_nonce(uint32_t seq, uint16_t src,
- uint16_t dst, uint32_t iv_index,
- bool aszmic, uint8_t nonce[13]);
-bool mesh_crypto_application_encrypt(uint8_t akf, uint32_t seq, uint16_t src,
- uint16_t dst, uint32_t iv_index,
- const uint8_t app_key[16],
- const uint8_t *aad, uint8_t aad_len,
- const uint8_t *msg, uint8_t msg_len,
- uint8_t *out,
- void *app_mic, size_t mic_size);
-bool mesh_crypto_application_decrypt(uint8_t akf, uint32_t seq, uint16_t src,
- uint16_t dst, uint32_t iv_index,
- const uint8_t app_key[16],
- const uint8_t *aad, uint8_t aad_len,
- const uint8_t *enc_msg, uint8_t enc_msg_len,
- uint8_t *out, void *app_mic, size_t mic_size);
bool mesh_crypto_device_key(const uint8_t secret[32],
const uint8_t salt[16],
uint8_t device_key[16]);
@@ -102,19 +69,6 @@ bool mesh_crypto_prov_conf_key(const uint8_t secret[32],
bool mesh_crypto_session_key(const uint8_t secret[32],
const uint8_t salt[16],
uint8_t session_key[16]);
-bool mesh_crypto_privacy_counter(uint32_t iv_index,
- const uint8_t *payload,
- uint8_t privacy_counter[16]);
-bool mesh_crypto_network_obfuscate(const uint8_t privacy_key[16],
- const uint8_t privacy_counter[16],
- bool ctl, uint8_t ttl, uint32_t seq,
- uint16_t src, uint8_t *out);
-bool mesh_crypto_network_clarify(const uint8_t privacy_key[16],
- const uint8_t privacy_counter[16],
- const uint8_t net_hdr[6],
- bool *ctl, uint8_t *ttl,
- uint32_t *seq, uint16_t *src);
-
bool mesh_crypto_packet_build(bool ctl, uint8_t ttl,
uint32_t seq,
uint16_t src, uint16_t dst,
@@ -146,8 +100,8 @@ bool mesh_crypto_payload_decrypt(uint8_t *aad, uint16_t aad_len,
uint8_t *out,
const uint8_t application_key[16]);
bool mesh_crypto_packet_encode(uint8_t *packet, uint8_t packet_len,
- const uint8_t network_key[16],
uint32_t iv_index,
+ const uint8_t network_key[16],
const uint8_t privacy_key[16]);
bool mesh_crypto_packet_decode(const uint8_t *packet, uint8_t packet_len,
bool proxy, uint8_t *out, uint32_t iv_index,
diff --git a/mesh/net-keys.c b/mesh/net-keys.c
index 683a924c4..f7eb2ca68 100644
--- a/mesh/net-keys.c
+++ b/mesh/net-keys.c
@@ -263,7 +263,7 @@ bool net_key_encrypt(uint32_t id, uint32_t iv_index, uint8_t *pkt, size_t len)
if (!key)
return false;
- result = mesh_crypto_packet_encode(pkt, len, key->encrypt, iv_index,
+ result = mesh_crypto_packet_encode(pkt, len, iv_index, key->encrypt,
key->privacy);
if (!result)
diff --git a/unit/test-mesh-crypto.c b/unit/test-mesh-crypto.c
index 6c2d36736..fb9539ef6 100644
--- a/unit/test-mesh-crypto.c
+++ b/unit/test-mesh-crypto.c
@@ -741,8 +741,8 @@ static void check_encrypt_segment(const struct mesh_crypto_test *keys,
uint8_t priv_rand[16];
uint8_t packet[29];
uint8_t packet_len;
- uint64_t net_mic64;
- uint32_t hdr, net_mic32;
+ uint32_t hdr;
+ uint64_t net_mic64, net_mic32;
size_t net_msg_len;
uint8_t key_aid = keys->key_aid | (keys->akf ? KEY_ID_AKF : 0x00);
@@ -818,13 +818,12 @@ static void check_encrypt_segment(const struct mesh_crypto_test *keys,
net_msg_len = len + 2;
show_data("TransportPayload", 7, packet + 7, net_msg_len);
- mesh_crypto_network_encrypt(keys->ctl,
- keys->net_ttl, keys->net_seq[0],
- keys->net_src,
- keys->iv_index, enc_key,
- packet + 7, len + 2, packet + 7,
- keys->ctl ? (void *)&net_mic64 :
- (void *)&net_mic32);
+ mesh_crypto_packet_encrypt(packet, packet_len,
+ enc_key,
+ keys->iv_index, false,
+ keys->ctl, keys->net_ttl,
+ keys->net_seq[0],
+ keys->net_src);
mesh_crypto_privacy_counter(keys->iv_index, packet + 7, priv_rand);
@@ -844,20 +843,22 @@ static void check_encrypt_segment(const struct mesh_crypto_test *keys,
verify_data("EncNetworkPayload", 7, keys->net_msg[0],
packet + 7, net_msg_len);
if (keys->ctl) {
+ net_mic64 = l_get_be64(packet + 7 + net_msg_len);
verify_uint64("NetworkMIC", 7 + net_msg_len,
- keys->net_mic64, net_mic64);
+ keys->net_mic64, net_mic64);
net_msg_len += 8;
} else {
+ net_mic32 = l_get_be32(packet + 7 + net_msg_len);
verify_uint32("NetworkMIC", 7 + net_msg_len,
- keys->net_mic32[0], net_mic32);
+ keys->net_mic32[0], net_mic32);
net_msg_len += 4;
}
show_data("PreObsPayload", 1, packet + 1, 6 + net_msg_len);
- mesh_crypto_network_obfuscate(priv_key, priv_rand,
- keys->ctl,
- keys->net_ttl, keys->net_seq[0],
- keys->net_src, packet + 1);
+ mesh_crypto_network_obfuscate(packet, priv_key,
+ keys->iv_index,
+ keys->ctl, keys->net_ttl,
+ keys->net_seq[0], keys->net_src);
show_data("PostObsPayload", 1, packet + 1, 6 + net_msg_len);
packet[0] = (keys->iv_index & 0x01) << 7 | nid;
@@ -980,25 +981,23 @@ static void check_encrypt(const struct mesh_crypto_test *keys)
if (keys->szmic) {
seg_max = SEG_MAX(app_msg_len + 8);
enc_msg = l_malloc(app_msg_len + 8);
- mesh_crypto_application_encrypt(key_aid, keys->app_seq,
- keys->net_src, keys->net_dst,
- keys->iv_index,
- keys->akf ? app_key : dev_key,
- aad, aad_len,
- app_msg, app_msg_len,
- enc_msg, &app_mic64, sizeof(app_mic64));
- l_put_be64(app_mic64, enc_msg + app_msg_len);
+
+ mesh_crypto_payload_encrypt(aad, app_msg,
+ enc_msg, app_msg_len,
+ keys->net_src, keys->net_dst, key_aid,
+ keys->app_seq, keys->iv_index,
+ keys->szmic,
+ keys->akf ? app_key : dev_key);
} else {
seg_max = SEG_MAX(app_msg_len + 4);
enc_msg = l_malloc(app_msg_len + 4);
- mesh_crypto_application_encrypt(key_aid, keys->app_seq,
- keys->net_src, keys->net_dst,
- keys->iv_index,
- keys->akf ? app_key : dev_key,
- aad, aad_len,
- app_msg, app_msg_len,
- enc_msg, &app_mic32, sizeof(app_mic32));
- l_put_be32(app_mic32, enc_msg + app_msg_len);
+
+ mesh_crypto_payload_encrypt(aad, app_msg,
+ enc_msg, app_msg_len,
+ keys->net_src, keys->net_dst, key_aid,
+ keys->app_seq, keys->iv_index,
+ keys->szmic,
+ keys->akf ? app_key : dev_key);
}
if (keys->dev_key && !keys->akf)
@@ -1018,10 +1017,12 @@ static void check_encrypt(const struct mesh_crypto_test *keys)
verify_data("EncryptedAppPayload", 0, keys->enc_msg, enc_msg,
app_msg_len);
if (keys->szmic) {
+ app_mic64 = l_get_be64(enc_msg + app_msg_len);
verify_uint64("ApplicationMIC", app_msg_len,
keys->app_mic64, app_mic64);
app_msg_len += 8;
} else {
+ app_mic32 = l_get_be32(enc_msg + app_msg_len);
verify_uint32("ApplicationMIC", app_msg_len,
keys->app_mic32, app_mic32);
app_msg_len += 4;
@@ -1133,20 +1134,18 @@ static void check_encrypt(const struct mesh_crypto_test *keys)
keys->net_seq[i], keys->net_src,
keys->iv_index, net_nonce);
- verify_data("TransportData", 9, keys->trans_pkt[i],
+ verify_data("TransportData", 9, keys->trans_pkt[i],
packet + 9, seg_len);
verify_uint16("DST", 7, keys->net_dst, l_get_be16(packet + 7));
net_msg_len = seg_len + 2;
show_data("TransportPayload", 7, packet + 7, net_msg_len);
- mesh_crypto_network_encrypt(keys->ctl,
- keys->net_ttl, keys->net_seq[i],
- keys->net_src,
- keys->iv_index, enc_key,
- packet + 7, seg_len + 2, packet + 7,
- keys->ctl ? (void *)&net_mic64 :
- (void *)&net_mic32);
+ mesh_crypto_packet_encrypt(packet, packet_len, enc_key,
+ keys->iv_index, false,
+ keys->ctl, keys->net_ttl,
+ keys->net_seq[i],
+ keys->net_src);
mesh_crypto_privacy_counter(keys->iv_index, packet + 7,
priv_rand);
@@ -1169,20 +1168,23 @@ static void check_encrypt(const struct mesh_crypto_test *keys)
verify_data("EncNetworkPayload", 7, keys->net_msg[i],
packet + 7, net_msg_len);
if (keys->ctl) {
+ net_mic64 = l_get_be64(packet + packet_len - 8);
verify_uint64("NetworkMIC", 7 + net_msg_len,
keys->net_mic64, net_mic64);
net_msg_len += 8;
} else {
+ net_mic32 = l_get_be32(packet + packet_len - 4);
verify_uint32("NetworkMIC", 7 + net_msg_len,
keys->net_mic32[i], net_mic32);
net_msg_len += 4;
}
show_data("PreObsPayload", 1, packet + 1, 6 + net_msg_len);
- mesh_crypto_network_obfuscate(priv_key, priv_rand,
- keys->ctl,
- keys->net_ttl, keys->net_seq[i],
- keys->net_src, packet + 1);
+ mesh_crypto_network_obfuscate(packet, priv_key,
+ keys->iv_index,
+ keys->ctl, keys->net_ttl,
+ keys->net_seq[i], keys->net_src);
+
show_data("PostObsPayload", 1, packet + 1, 6 + net_msg_len);
packet[0] = (keys->iv_index & 0x01) << 7 | nid;
@@ -1203,7 +1205,7 @@ done:
static void check_decrypt_segment(const struct mesh_crypto_test *keys,
uint16_t seg, uint16_t seg_max,
- const uint8_t *pkt, uint8_t pkt_len,
+ uint8_t *pkt, uint8_t pkt_len,
const uint8_t *msg, uint8_t msg_len,
uint8_t *enc_key, uint8_t *priv_key,
uint8_t nid)
@@ -1235,26 +1237,30 @@ static void check_decrypt_segment(const struct mesh_crypto_test *keys,
if (ctl) {
net_mic64 = l_get_be64(pkt + pkt_len - 8);
show_data("EncryptedPayload", 7, pkt + 7, pkt_len - 7 - 8);
- mesh_crypto_network_decrypt(ctl, ttl, seq,
- src, keys->iv_index, enc_key,
- pkt + 7, pkt_len - 7, net_clr + 7,
- &calc_net_mic64,
- sizeof(calc_net_mic64));
+
+ mesh_crypto_packet_decrypt(pkt, pkt_len,
+ enc_key,
+ keys->iv_index, false,
+ ctl, ttl, seq,
+ src);
+ calc_net_mic64 = l_get_be64(pkt + pkt_len - 8);
+
verify_uint64("NetworkMIC", pkt_len - 8, net_mic64,
- calc_net_mic64);
+ net_mic64 ^ calc_net_mic64);
show_data("DecryptedPayload", 7, net_clr + 7, pkt_len - 7 - 8);
} else {
net_mic32 = l_get_be32(pkt + pkt_len - 4);
show_data("EncryptedPayload", 7, pkt + 7, pkt_len - 7 - 4);
- mesh_crypto_network_decrypt(ctl, ttl, seq,
- src, keys->iv_index, enc_key,
- pkt + 7, pkt_len - 7, net_clr + 7,
- &calc_net_mic32,
- sizeof(calc_net_mic32));
+ mesh_crypto_packet_decrypt(pkt, pkt_len,
+ enc_key,
+ keys->iv_index, false,
+ ctl, ttl, seq,
+ src);
+ calc_net_mic32 = l_get_be32(pkt + pkt_len - 4);
verify_uint32("NetworkMIC", pkt_len - 4, net_mic32,
- calc_net_mic32);
+ net_mic32 ^ calc_net_mic32);
show_data("DecryptedPayload", 7, net_clr + 7, pkt_len - 7 - 4);
}
@@ -1348,15 +1354,11 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
uint8_t *app_key;
uint8_t *net_key;
uint8_t enc_key[16];
- uint8_t net_nonce[13];
- uint8_t app_nonce[13];
uint8_t priv_key[16];
- uint8_t priv_rand[16];
uint8_t p[9];
size_t p_len;
uint8_t *packet = NULL;
size_t packet_len;
- const uint8_t *net_hdr;
uint8_t *net_msg;
uint8_t net_msg_len;
uint16_t app_msg_len = 0;
@@ -1430,9 +1432,6 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
goto done;
}
- mesh_crypto_application_nonce(keys->app_seq, keys->net_src,
- keys->net_dst, keys->iv_index,
- keys->szmic, app_nonce);
app_msg = l_malloc(384);
seg_max = (sizeof(keys->packet) / sizeof(keys->packet[0])) - 1;
@@ -1444,19 +1443,13 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
if (keys->segmented)
l_info(COLOR_YELLOW "Segment-%d" COLOR_OFF, i);
- mesh_crypto_network_nonce(keys->frnd, keys->net_ttl,
- keys->net_seq[i], keys->net_src, keys->iv_index,
- net_nonce);
l_free(packet);
packet = l_util_from_hexstring(keys->packet[i], &packet_len);
- net_hdr = packet + 1;
net_msg = packet + 7;
net_msg_len = packet_len - 7;
- mesh_crypto_privacy_counter(keys->iv_index, net_msg, priv_rand);
-
- mesh_crypto_network_clarify(priv_key, priv_rand, net_hdr,
+ mesh_crypto_network_clarify(packet, priv_key, keys->iv_index,
&net_ctl, &net_ttl, &net_seq, &net_src);
show_str("Packet", 0, keys->packet[i]);
@@ -1465,29 +1458,31 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
net_mic64 = l_get_be64(packet + packet_len - 8);
show_data("NetworkMessage", 7, net_msg,
net_msg_len - 8);
- mesh_crypto_network_decrypt(net_ctl, net_ttl, net_seq,
- net_src, keys->iv_index, enc_key,
- net_msg, net_msg_len, net_msg,
- &calc_net_mic64,
- sizeof(calc_net_mic64));
+ mesh_crypto_packet_decrypt(packet, packet_len,
+ enc_key,
+ keys->iv_index, false,
+ net_ctl, net_ttl,
+ net_seq,
+ net_src);
+ calc_net_mic64 = l_get_be64(packet + packet_len - 8);
net_msg_len -= 8;
verify_uint64("NetworkMIC", 7 + net_msg_len, net_mic64,
- calc_net_mic64);
+ net_mic64 ^ calc_net_mic64);
show_data("DecryptedNetwork", 7, net_msg, net_msg_len);
} else {
net_mic32 = l_get_be32(packet + packet_len - 4);
show_data("NetworkMessage", 7, net_msg,
net_msg_len - 4);
-
- mesh_crypto_network_decrypt(net_ctl, net_ttl, net_seq,
- net_src, keys->iv_index, enc_key,
- net_msg, net_msg_len, net_msg,
- &calc_net_mic32,
- sizeof(calc_net_mic32));
-
+ mesh_crypto_packet_decrypt(packet, packet_len,
+ enc_key,
+ keys->iv_index, false,
+ net_ctl, net_ttl,
+ net_seq,
+ net_src);
+ calc_net_mic32 = l_get_be32(packet + packet_len - 4);
net_msg_len -= 4;
verify_uint32("NetworkMIC", 7 + net_msg_len, net_mic32,
- calc_net_mic32);
+ net_mic32 ^ calc_net_mic32);
show_data("DecryptedNetwork", 7, net_msg, net_msg_len);
}
@@ -1606,8 +1601,8 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
packet, &pkt_len);
verify_data("TransportData", 9, keys->trans_pkt[i], packet + 9,
payload_len);
- mesh_crypto_packet_encode(packet, pkt_len, enc_key,
- keys->iv_index, priv_key);
+ mesh_crypto_packet_encode(packet, pkt_len, keys->iv_index,
+ enc_key, priv_key);
mesh_crypto_packet_label(packet, pkt_len, keys->iv_index, nid);
verify_data("Encoded-Packet", 0, keys->packet[i], packet,
@@ -1627,39 +1622,45 @@ static void check_decrypt(const struct mesh_crypto_test *keys)
app_msg_len - 8);
app_mic64 = l_get_be64(app_msg + app_msg_len - 8);
- mesh_crypto_application_decrypt(
- keys_aid | (keys->akf ? KEY_ID_AKF : 0),
- seqZero, net_src,
- net_dst, keys->iv_index,
- keys->akf ? app_key : dev_key,
+ mesh_crypto_payload_decrypt(
aad, aad_len,
app_msg, app_msg_len,
- app_msg, &calc_app_mic64,
- sizeof(calc_app_mic64));
+ true,
+ net_src, net_dst,
+ keys->akf ? keys_aid | KEY_ID_AKF : APP_AID_DEV,
+ seqZero,
+ keys->iv_index,
+ app_msg,
+ keys->akf ? app_key : dev_key);
+
+ calc_app_mic64 = l_get_be64(app_msg + app_msg_len - 8);
verify_data("Payload", 0, keys->app_msg, app_msg,
app_msg_len - 8);
verify_uint64("ApplicationMIC", app_msg_len - 8, app_mic64,
- calc_app_mic64);
+ app_mic64 ^ calc_app_mic64);
} else if (!keys->ctl) {
verify_data("EncryptedPayload", 0, keys->enc_msg, app_msg,
app_msg_len - 4);
app_mic32 = l_get_be32(app_msg + app_msg_len - 4);
- mesh_crypto_application_decrypt(
- keys_aid | (keys->akf ? KEY_ID_AKF : 0),
- seqZero, net_src,
- net_dst, keys->iv_index,
- keys->akf ? app_key : dev_key,
+ mesh_crypto_payload_decrypt(
aad, aad_len,
app_msg, app_msg_len,
- app_msg, &calc_app_mic32,
- sizeof(calc_app_mic32));
+ false,
+ net_src, net_dst,
+ keys->akf ? keys_aid | KEY_ID_AKF : APP_AID_DEV,
+ seqZero,
+ keys->iv_index,
+ app_msg,
+ keys->akf ? app_key : dev_key);
+
+ calc_app_mic32 = l_get_be64(app_msg + app_msg_len - 4);
verify_data("Payload", 0, keys->app_msg, app_msg,
app_msg_len - 4);
verify_uint32("ApplicationMIC", app_msg_len - 4, app_mic32,
- calc_app_mic32);
+ app_mic32 ^ calc_app_mic32);
}
done:
--
2.20.1
Hi Brian,
On 01/13, Michał Lowas-Rzechonek wrote:
> This is a followup to commits 79fd24af1 45beec16b and 37bbe30c9,
> continuing a cleanup of mesh/crypto.
>
> This version works with unit tests added in 06cf0fd1c.
Any chances to apply this, or is there something I should improve?
--
Michał Lowas-Rzechonek <[email protected]>
Silvair http://silvair.com
Jasnogórska 44, 31-358 Krakow, POLAND