Save RAK repeater flash while retaining fast field arithmetic
Use compact scalar crypto, reviewed GNSS version parsing and shared CLI reply copies for RAK3401/RAK4631 repeaters. Preserve keys, protocols, commands and configured capacities. Both Reduced images save 11,580 bytes. SWD measurements on the RAK3401 found scalar-only signing still near 50.9 ms and key exchange near 38 ms. Keep compact field arithmetic off: its extra 4.3 KiB saving adds about a quarter second and delays radio servicing. Validate Full and Reduced production OTA packages on both boards, focused crypto/GPS/CLI tests, and linked ARM crypto outputs. Include the RAM benchmark harness and scoped results. No live RF packet-loss qualification is claimed.
This commit is contained in:
mikecarper committed
1 parent
308fec1162
commit
08b1c8826c
9 files changed
+1256
-10
No files matched your search
@@ -584,6 +584,11 @@ reduction does not disable generic I2C or unrelated board-integrated peripherals
|
||||
These reduced RAK profiles keep their own readable OTA target name and omit
|
||||
the all-board name catalog. Updates for other targets display numeric IDs;
|
||||
OTA compatibility checks and transfers are unchanged.
|
||||
RAK3401/RAK4631 Repeater builds also use compact scalar arithmetic, shared CLI
|
||||
reply copies, and a smaller GPS version parser. Keys, packet formats, commands,
|
||||
responses and GPS support are preserved. Fast field arithmetic remains enabled
|
||||
to avoid the long crypto pause; see the
|
||||
[measured size and timing comparison](test-results/rak_compact_crypto_2026-10-27.md).
|
||||
Reduced RAK3401 and RAK4631 targets retain INA219/INA226/INA260/INA3221 as
|
||||
voltage/current entries in the optional sensor table. They are not the only I2C
|
||||
users: the SSD1306 OLED, supported autodiscovered RTCs, and RAK12500 GPS remain
|
||||
|
||||
@@ -0,0 +1,115 @@
|
||||
# RAK repeater flash and crypto timing, 27 October 2026
|
||||
|
||||
Selected: **compact scalar arithmetic with the existing fast field arithmetic**.
|
||||
The GPS parser and CLI reply-copy changes are also enabled. No commands, GPS
|
||||
providers, keys, packet formats or configured capacities are removed.
|
||||
|
||||
Both Reduced RAK repeater builds save **11,580 bytes (11.31 KiB)**. The much
|
||||
slower compact-field experiment saves only another 4,384 bytes (4.28 KiB) and
|
||||
is **not enabled by this change**.
|
||||
|
||||
## Physical RAK3401 measurements
|
||||
|
||||
The Pi's GPIO SWD debugger ran each implementation on the same RAK3401. Values
|
||||
below are medians from 18 measurements per operation, using two public test
|
||||
seeds from RFC 8032 and one discarded warmup per seed/operation.
|
||||
|
||||
| Operation | Before, ms | Selected scalar-only, ms | Rejected scalar + field, ms |
|
||||
| --- | ---: | ---: | ---: |
|
||||
| Generate keypair | 47.513 | 47.145 | 297.863 |
|
||||
| Sign empty message | 48.738 | 48.753 | 299.472 |
|
||||
| Sign 96-byte message | 50.887 | 50.902 | 301.621 |
|
||||
| Sign 256-byte message | 52.991 | 53.006 | 303.725 |
|
||||
| Calculate shared secret | 38.147 | 37.951 | 274.195 |
|
||||
|
||||
The selected implementation adds **0.015 ms** to signing in this measurement.
|
||||
The unchanged field routines also show small timing differences between
|
||||
layouts; these measurements do not promise a 15 us difference in every build.
|
||||
The rejected field implementation adds about 251 ms to signing and 236 ms to
|
||||
key exchange.
|
||||
|
||||
Code and constants ran from **SRAM**, at 64 MHz, with interrupts masked. The
|
||||
Cortex-M4 DWT cycle counter measured each operation. The 20-cycle measurement
|
||||
overhead is included in every result. These are isolated algorithm timings,
|
||||
not flash-resident firmware, Bluetooth, LoRa airtime or end-to-end CLI timings.
|
||||
|
||||
Every measured public key, signature and shared secret matched independent
|
||||
host cryptography. Signature checks covered empty, 96-byte and 256-byte
|
||||
messages for both seeds. Shared secrets were checked through an independent
|
||||
Edwards-to-Montgomery conversion and X25519 implementation.
|
||||
|
||||
The existing watchdog survives software reset. The harness feeds its enabled
|
||||
channels between operations, outside the timed region. Initial attempts that
|
||||
failed reset/watchdog setup gates produced no accepted measurements. The final
|
||||
three runs completed and reset into the existing application. Application
|
||||
flash, bootloader and stored data were not updated; the Pi's gateway and host
|
||||
CLI services were restored and reported active.
|
||||
|
||||
## When this work runs
|
||||
|
||||
- Signing happens when creating the repeater's own adverts and signed fleet or
|
||||
host-service messages. Advert frequency follows the saved advert intervals.
|
||||
- Fresh shared-secret calculations happen for login attempts and anonymous
|
||||
region, owner and clock requests addressed to the node, including outgoing
|
||||
region queries. Boot also reconstructs secrets for stored ACL entries.
|
||||
- Established ACL sessions copy cached secrets. Ordinary relaying does not
|
||||
sign every forwarded packet. Receive-side signature verification retains
|
||||
its existing CC310 implementation and existing software fallback.
|
||||
|
||||
Already queued software packets can wait during crypto, but the radio ISR only
|
||||
records an event. The main loop reads the radio FIFO and services radio2
|
||||
switching later. Extending a synchronous operation by a quarter second can
|
||||
therefore lose new RF packets; software queues do not make that lossless.
|
||||
The selected policy avoids that added pause. **Live RF packet-loss testing was
|
||||
not performed for this optimization.**
|
||||
|
||||
## Firmware size and build checks
|
||||
|
||||
Sizes are ELF `.text + .data`, not the larger UF2 container size. Baselines
|
||||
already include the earlier reduced-build OTA target-name catalog saving.
|
||||
|
||||
| Build | Before, bytes | Selected, bytes | Saving, bytes |
|
||||
| --- | ---: | ---: | ---: |
|
||||
| RAK3401 Reduced repeater | 575,644 | 564,064 | 11,580 |
|
||||
| RAK4631 Reduced repeater | 626,884 | 615,304 | 11,580 |
|
||||
|
||||
Full and Reduced production packaging passed for both RAKs with the Cascade
|
||||
profile and required LoRa OTA. Checks included capability markers, conservative
|
||||
RAM budgets, compiled Bluetooth DFU handoff and application-only UF2 address
|
||||
ranges. This is build validation, not physical OTA qualification. Full RAK4631
|
||||
retains a tight conservative RAM budget: 83,180 bytes available against an
|
||||
83,136-byte estimate. The existing 8 KiB loop stack is retained.
|
||||
|
||||
Focused scalar/field arithmetic, RFC/random crypto parity, sanitizer, GNSS
|
||||
parser, CLI argument and fleet schedule tests passed. Checks of both selected
|
||||
linked ARM firmware images also reproduced the expected public keys,
|
||||
signatures and shared secrets. Their emulated signing frame grows from 3,312
|
||||
to 3,512 bytes, excluding caller and interrupt frames; keypair and key-exchange
|
||||
frames are unchanged. This fits within the retained loop stack but is not a
|
||||
measurement of whole-application stack usage.
|
||||
|
||||
## Reproduction and evidence
|
||||
|
||||
The [RAM harness](https://github.com/mikecarper/MeshCore/blob/keymindCascade/tools/hil/nrf52_crypto_benchmark.c) and
|
||||
[linker script](https://github.com/mikecarper/MeshCore/blob/keymindCascade/tools/hil/nrf52_crypto_benchmark.ld) are for debugger use
|
||||
on an nRF52840 only. They are not production application images. Build with
|
||||
GCC 14.2.1, `-Os -flto -mcpu=cortex-m4 -mthumb -mfloat-abi=hard
|
||||
-mfpu=fpv4-sp-d16 -ffunction-sections -fdata-sections -fno-strict-aliasing`,
|
||||
`ED25519_COMPACT_BASE=1`, `ED25519_COMPACT_SHA512=1` and `ED25519_NO_SEED=1`.
|
||||
Link `fe.c`, `ge.c`, `keypair.c`, `sc.c`, `sha512.c`, `sign.c` and
|
||||
`key_exchange.c` from `lib/ed25519`, with `-nostartfiles`, the supplied linker
|
||||
script, `--gc-sections`, libc and libgcc.
|
||||
|
||||
Use scalar/field flags `0/0` for baseline, `1/0` for selected, and `1/1` for the
|
||||
rejected experiment. `BENCH_COMPACT` is only a report label (0, 2 and 1,
|
||||
respectively). The recorded scalar-only run used scalar flag 2, which selects
|
||||
the same nonzero preprocessor branch as production value 1.
|
||||
|
||||
After verifying the physical chip identity, reset/halt, load the ELF into RAM,
|
||||
resume at `bench_start`, and read `report` only after its completion marker is
|
||||
`0xC0DEF17E`. The watchdog must pause while halted. Reset back into the normal
|
||||
application afterward. No flash programming is needed for this benchmark.
|
||||
|
||||
[Machine-readable results](rak_compact_crypto_2026-10-27.safe.json) include raw
|
||||
cycle counts, image and harness hashes, build checks, and the rejected candidate
|
||||
for comparison.
|
||||
@@ -0,0 +1,923 @@
|
||||
{
|
||||
"schema_version": 1,
|
||||
"date": "2026-10-27",
|
||||
"base_commit": "308fec1162e77134d15206b819dd59e898ed910b",
|
||||
"selected_policy": "Compact scalar arithmetic, ordinary fast field arithmetic, reviewed GPS parser, shared CLI reply-copy compiler policy. RAK3401/RAK4631 repeater roles only.",
|
||||
"scope": "RAK3401 physical RAM-resident algorithm timing and production Full/Reduced build checks for both RAKs. This is not flash-resident application timing or live RF/OTA qualification.",
|
||||
"selected_flash_images": {
|
||||
"3401": {
|
||||
"full": {
|
||||
"flash_text_bytes": 622456,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 623336,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "1e7764ba9d5b081fe1dde7cff5d6a67a067d38ab03549d2889eadace09706dd7",
|
||||
"available_internal_bytes": 80212,
|
||||
"conservative_required_heap_bytes": 75920,
|
||||
"capabilities_manifest_sha256": "5d1dcea9e49241c94caf77632ae5e277794571ce8b079817027a24c8f228a5bf"
|
||||
},
|
||||
"reduced": {
|
||||
"flash_text_bytes": 563184,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 564064,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "4f7ea9df20e9fbbcab97fc1f98d67cbaaea9fd59d79111b4c01dcf83b4338330",
|
||||
"available_internal_bytes": 82720,
|
||||
"conservative_required_heap_bytes": 73872,
|
||||
"capabilities_manifest_sha256": "9e9d02a55b1ace5be35a092ce51cb90509523183cfccfce6597c8e7d4a1eb4da"
|
||||
},
|
||||
"reduced_before": {
|
||||
"flash_text_bytes": 574764,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 575644,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "cc735f36b3976527b7a295fed78a43627c41e565b81ce54418ff1ecd22e712f2"
|
||||
},
|
||||
"reduced_saved_bytes": 11580
|
||||
},
|
||||
"4631": {
|
||||
"full": {
|
||||
"flash_text_bytes": 682064,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 682948,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "a4b4fda84ca6cadb733de703e692f608691a5dcd3cf31e474ad0c3898105eef4",
|
||||
"available_internal_bytes": 83180,
|
||||
"conservative_required_heap_bytes": 83136,
|
||||
"capabilities_manifest_sha256": "c1b05b741f6a822334d33083d51737435b2f7e72eea3633b24eda07fc43a6971"
|
||||
},
|
||||
"reduced": {
|
||||
"flash_text_bytes": 614420,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 615304,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "23fae794233d6df9d2c44cf490dba5ee1b4454f49d614a8291fd92e10e04eab1",
|
||||
"available_internal_bytes": 85696,
|
||||
"conservative_required_heap_bytes": 81088,
|
||||
"capabilities_manifest_sha256": "4aa11fff367ddd1f7c70b103994dd50cad984158658eb361a5b411c2e8fcefde"
|
||||
},
|
||||
"reduced_before": {
|
||||
"flash_text_bytes": 626000,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 626884,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "560e9863598a122fe39bc85fa150d0ec4c96482cd00e74779d99c74fe1407bb9"
|
||||
},
|
||||
"reduced_saved_bytes": 11580
|
||||
}
|
||||
},
|
||||
"hardware_timing": {
|
||||
"baseline": {
|
||||
"independent_outputs_checked": 10,
|
||||
"elf_sha256": "05e2292b9cc1ea3273dc21c366d0244a8c8176a7d817f65308fc70db51b14d90",
|
||||
"report_sha256": "e14a1135ddb7cc8f3800a6d75320b3aced6390ed09900b9a85179b832757f8e4",
|
||||
"cpu_hz": 64000000,
|
||||
"cpuid": "0x410fc241",
|
||||
"clock_stat": "0x10001",
|
||||
"watchdog": {
|
||||
"running": 1,
|
||||
"config": 1,
|
||||
"timeout_s": 60.0
|
||||
},
|
||||
"measurement_overhead_cycles": [
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20
|
||||
],
|
||||
"measurements": {
|
||||
"keypair": {
|
||||
"cycles": [
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814,
|
||||
3040814
|
||||
],
|
||||
"min_ms": 47.51271875,
|
||||
"median_ms": 47.51271875,
|
||||
"max_ms": 47.51271875
|
||||
},
|
||||
"sign_empty": {
|
||||
"cycles": [
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219,
|
||||
3119219
|
||||
],
|
||||
"min_ms": 48.737796875,
|
||||
"median_ms": 48.737796875,
|
||||
"max_ms": 48.737796875
|
||||
},
|
||||
"sign96": {
|
||||
"cycles": [
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753,
|
||||
3256753
|
||||
],
|
||||
"min_ms": 50.886765625,
|
||||
"median_ms": 50.886765625,
|
||||
"max_ms": 50.886765625
|
||||
},
|
||||
"sign256": {
|
||||
"cycles": [
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411,
|
||||
3391411
|
||||
],
|
||||
"min_ms": 52.990796875,
|
||||
"median_ms": 52.990796875,
|
||||
"max_ms": 52.990796875
|
||||
},
|
||||
"shared_secret": {
|
||||
"cycles": [
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426,
|
||||
2441426
|
||||
],
|
||||
"min_ms": 38.14728125,
|
||||
"median_ms": 38.14728125,
|
||||
"max_ms": 38.14728125
|
||||
}
|
||||
}
|
||||
},
|
||||
"compact": {
|
||||
"independent_outputs_checked": 10,
|
||||
"elf_sha256": "f637e1d5fda112ca1a8b19aa1cee6589d70db30de894ec28529c7a3dce8d16d3",
|
||||
"report_sha256": "fa1ba95afd7a7d7d1b1047e82894ed0644608ddafc3ce9403949b62842721bd6",
|
||||
"cpu_hz": 64000000,
|
||||
"cpuid": "0x410fc241",
|
||||
"clock_stat": "0x10001",
|
||||
"watchdog": {
|
||||
"running": 1,
|
||||
"config": 1,
|
||||
"timeout_s": 60.0
|
||||
},
|
||||
"measurement_overhead_cycles": [
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20
|
||||
],
|
||||
"measurements": {
|
||||
"keypair": {
|
||||
"cycles": [
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260,
|
||||
19063260
|
||||
],
|
||||
"min_ms": 297.8634375,
|
||||
"median_ms": 297.8634375,
|
||||
"max_ms": 297.8634375
|
||||
},
|
||||
"sign_empty": {
|
||||
"cycles": [
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191,
|
||||
19166191
|
||||
],
|
||||
"min_ms": 299.471734375,
|
||||
"median_ms": 299.471734375,
|
||||
"max_ms": 299.471734375
|
||||
},
|
||||
"sign96": {
|
||||
"cycles": [
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725,
|
||||
19303725
|
||||
],
|
||||
"min_ms": 301.620703125,
|
||||
"median_ms": 301.620703125,
|
||||
"max_ms": 301.620703125
|
||||
},
|
||||
"sign256": {
|
||||
"cycles": [
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383,
|
||||
19438383
|
||||
],
|
||||
"min_ms": 303.724734375,
|
||||
"median_ms": 303.724734375,
|
||||
"max_ms": 303.724734375
|
||||
},
|
||||
"shared_secret": {
|
||||
"cycles": [
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456,
|
||||
17548456
|
||||
],
|
||||
"min_ms": 274.194625,
|
||||
"median_ms": 274.194625,
|
||||
"max_ms": 274.194625
|
||||
}
|
||||
}
|
||||
},
|
||||
"scalar_only": {
|
||||
"independent_outputs_checked": 10,
|
||||
"elf_sha256": "b4da043bc9e91fb4ddacce31e766d363e01dcfb861bff796c76d35391a1450d8",
|
||||
"report_sha256": "ce660aa04cacfa7ef671c943611ac2ce7b56e53fe5e91a2012e5d03a33dbdde4",
|
||||
"cpu_hz": 64000000,
|
||||
"cpuid": "0x410fc241",
|
||||
"clock_stat": "0x10001",
|
||||
"watchdog": {
|
||||
"running": 1,
|
||||
"config": 1,
|
||||
"timeout_s": 60.0
|
||||
},
|
||||
"measurement_overhead_cycles": [
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20,
|
||||
20
|
||||
],
|
||||
"measurements": {
|
||||
"keypair": {
|
||||
"cycles": [
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258,
|
||||
3017258
|
||||
],
|
||||
"min_ms": 47.14465625,
|
||||
"median_ms": 47.14465625,
|
||||
"max_ms": 47.14465625
|
||||
},
|
||||
"sign_empty": {
|
||||
"cycles": [
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189,
|
||||
3120189
|
||||
],
|
||||
"min_ms": 48.752953125,
|
||||
"median_ms": 48.752953125,
|
||||
"max_ms": 48.752953125
|
||||
},
|
||||
"sign96": {
|
||||
"cycles": [
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723,
|
||||
3257723
|
||||
],
|
||||
"min_ms": 50.901921875,
|
||||
"median_ms": 50.901921875,
|
||||
"max_ms": 50.901921875
|
||||
},
|
||||
"sign256": {
|
||||
"cycles": [
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381,
|
||||
3392381
|
||||
],
|
||||
"min_ms": 53.005953125,
|
||||
"median_ms": 53.005953125,
|
||||
"max_ms": 53.005953125
|
||||
},
|
||||
"shared_secret": {
|
||||
"cycles": [
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881,
|
||||
2428881
|
||||
],
|
||||
"min_ms": 37.951265625,
|
||||
"median_ms": 37.951265625,
|
||||
"max_ms": 37.951265625
|
||||
}
|
||||
}
|
||||
},
|
||||
"comparison": {
|
||||
"keypair": {
|
||||
"added_ms": 250.35071874999997,
|
||||
"ratio": 6.269130568328086
|
||||
},
|
||||
"sign_empty": {
|
||||
"added_ms": 250.73393749999997,
|
||||
"ratio": 6.144548042314438
|
||||
},
|
||||
"sign96": {
|
||||
"added_ms": 250.73393749999997,
|
||||
"ratio": 5.927291692062615
|
||||
},
|
||||
"sign256": {
|
||||
"added_ms": 250.73393750000002,
|
||||
"ratio": 5.731650631551293
|
||||
},
|
||||
"shared_secret": {
|
||||
"added_ms": 236.04734374999998,
|
||||
"ratio": 7.187789431258617
|
||||
}
|
||||
},
|
||||
"scalar_only_comparison": {
|
||||
"keypair": {
|
||||
"added_ms": -0.3680625000000006
|
||||
},
|
||||
"sign_empty": {
|
||||
"added_ms": 0.015156249999996874
|
||||
},
|
||||
"sign96": {
|
||||
"added_ms": 0.015156249999996874
|
||||
},
|
||||
"sign256": {
|
||||
"added_ms": 0.015156249999996874
|
||||
},
|
||||
"shared_secret": {
|
||||
"added_ms": -0.19601562500000114
|
||||
}
|
||||
}
|
||||
},
|
||||
"hardware_method": {
|
||||
"clock_hz": 64000000,
|
||||
"code_and_constants": "SRAM",
|
||||
"interrupts": "masked",
|
||||
"per_operation_samples": 18,
|
||||
"vectors": 2,
|
||||
"warmups_per_vector_and_operation": 1,
|
||||
"watchdog": "fed before each operation, outside the timed region; 60 second configured timeout",
|
||||
"counter": "Cortex-M4 DWT CYCCNT",
|
||||
"overhead": "20 cycles, included in the displayed timings",
|
||||
"normal_application_flash_changed": false,
|
||||
"bootloader_changed": false,
|
||||
"existing_application_and_gateway_services_restored": true
|
||||
},
|
||||
"benchmark_sources": {
|
||||
"tools/hil/nrf52_crypto_benchmark.c": "64f4d2f4d189e9d4b01a64b33f1f2d461a86bc7c276f4a514459325c7a022a23",
|
||||
"tools/hil/nrf52_crypto_benchmark.ld": "c12f3aaabad0a81c788c5eb869d09e5ecd5de5b2982af5c034daf2140b688f17"
|
||||
},
|
||||
"compiler": "arm-none-eabi-gcc 14.2.1",
|
||||
"benchmark_flags": [
|
||||
"-std=c99",
|
||||
"-Os",
|
||||
"-flto",
|
||||
"-mcpu=cortex-m4",
|
||||
"-mthumb",
|
||||
"-mfloat-abi=hard",
|
||||
"-mfpu=fpv4-sp-d16",
|
||||
"-ffunction-sections",
|
||||
"-fdata-sections",
|
||||
"-fno-strict-aliasing",
|
||||
"-DED25519_NO_SEED=1",
|
||||
"-DED25519_COMPACT_BASE=1",
|
||||
"-DED25519_COMPACT_SHA512=1"
|
||||
],
|
||||
"benchmark_modes": {
|
||||
"baseline": {
|
||||
"BENCH_COMPACT": 0,
|
||||
"ED25519_COMPACT_SCALAR": 0,
|
||||
"ED25519_COMPACT_FIELD": 0
|
||||
},
|
||||
"compact": {
|
||||
"BENCH_COMPACT": 1,
|
||||
"ED25519_COMPACT_SCALAR": 1,
|
||||
"ED25519_COMPACT_FIELD": 1
|
||||
},
|
||||
"scalar_only": {
|
||||
"BENCH_COMPACT": 2,
|
||||
"ED25519_COMPACT_SCALAR": 2,
|
||||
"ED25519_COMPACT_FIELD": 0,
|
||||
"note": "Scalar flag 2 is true in the same preprocessor gate as the selected production value 1."
|
||||
}
|
||||
},
|
||||
"rejected_field_candidate": {
|
||||
"reason": "Adds about 251 ms to signing and 236 ms to shared-secret calculation; synchronous radio servicing can be delayed.",
|
||||
"production_flash_images": {
|
||||
"3401": {
|
||||
"reduced_before": {
|
||||
"flash_text_bytes": 574764,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 575644,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "cc735f36b3976527b7a295fed78a43627c41e565b81ce54418ff1ecd22e712f2"
|
||||
},
|
||||
"reduced_after": {
|
||||
"flash_text_bytes": 558800,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 559680,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "4306af7914d4f2a21296d21537a6959e9d69bddb6c6f5ac24b007ce1bfaea34a"
|
||||
},
|
||||
"full_after": {
|
||||
"flash_text_bytes": 618056,
|
||||
"flash_data_bytes": 880,
|
||||
"flash_bytes": 618936,
|
||||
"bss_bytes": 234568,
|
||||
"elf_sha256": "320cf1ef5a436c77781f69618fee4824cf52518d6756f216fdebc8a2e3b46b71"
|
||||
},
|
||||
"reduced_saved_bytes": 15964
|
||||
},
|
||||
"4631": {
|
||||
"reduced_before": {
|
||||
"flash_text_bytes": 626000,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 626884,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "560e9863598a122fe39bc85fa150d0ec4c96482cd00e74779d99c74fe1407bb9"
|
||||
},
|
||||
"reduced_after": {
|
||||
"flash_text_bytes": 610036,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 610920,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "09355d3e839821ad3147be87199dd3cd608b3a1978cbd19234661f304d0a7e84"
|
||||
},
|
||||
"full_after": {
|
||||
"flash_text_bytes": 677680,
|
||||
"flash_data_bytes": 884,
|
||||
"flash_bytes": 678564,
|
||||
"bss_bytes": 234564,
|
||||
"elf_sha256": "5f75a4b1b699279d0746aa8c041015665948c6bc3ba02a1d1c1e146c23b7aa10"
|
||||
},
|
||||
"reduced_saved_bytes": 15964
|
||||
}
|
||||
},
|
||||
"additional_reduced_savings_bytes": 4384,
|
||||
"prior_4631_incremental_savings_bytes": {
|
||||
"compact_scalar_and_field": 14008,
|
||||
"gps_version_parser": 1940,
|
||||
"cli_reply_copy_compiler_policy": 16,
|
||||
"total": 15964
|
||||
}
|
||||
},
|
||||
"production_validation": {
|
||||
"3401_full": {
|
||||
"capability_markers": 14,
|
||||
"passed": true
|
||||
},
|
||||
"3401_reduced": {
|
||||
"capability_markers": 12,
|
||||
"passed": true
|
||||
},
|
||||
"4631_full": {
|
||||
"capability_markers": 16,
|
||||
"passed": true
|
||||
},
|
||||
"4631_reduced": {
|
||||
"capability_markers": 14,
|
||||
"passed": true
|
||||
},
|
||||
"checks": [
|
||||
"LoRa OTA required by production packaging",
|
||||
"Conservative RAM budget",
|
||||
"Compiled Bluetooth DFU handoff",
|
||||
"Application-only UF2 address range"
|
||||
]
|
||||
},
|
||||
"linked_arm_checks": {
|
||||
"3401": {
|
||||
"passed": true,
|
||||
"elf_sha256": "4f7ea9df20e9fbbcab97fc1f98d67cbaaea9fd59d79111b4c01dcf83b4338330",
|
||||
"instruction_meter": "native",
|
||||
"measurements": [
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 0,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1678474
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1706221
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1733968
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 1,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 1,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1290321
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 1,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1678524
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1706221
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1733968
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 2,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 2,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1289673
|
||||
}
|
||||
],
|
||||
"scope": "Actual linked ARM crypto frames/instruction counts only; excludes caller/ISR stacks and physical timing."
|
||||
},
|
||||
"4631": {
|
||||
"passed": true,
|
||||
"elf_sha256": "23fae794233d6df9d2c44cf490dba5ee1b4454f49d614a8291fd92e10e04eab1",
|
||||
"instruction_meter": "native",
|
||||
"measurements": [
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 0,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1678474
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1706221
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1733968
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 1,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 1,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1290321
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 1,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1678524
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1706221
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3512,
|
||||
"instructions": 1733968
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 2,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 2,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1289673
|
||||
}
|
||||
],
|
||||
"scope": "Actual linked ARM crypto frames/instruction counts only; excludes caller/ISR stacks and physical timing."
|
||||
}
|
||||
},
|
||||
"linked_arm_baseline_4631": {
|
||||
"passed": true,
|
||||
"elf_sha256": "2beff2f916231421287e0a774b6289df365336bfaa0d325a1521985b9001a18b",
|
||||
"instruction_meter": "native",
|
||||
"measurements": [
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 0,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1666244
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1693991
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 1,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1721738
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 1,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 1,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1290329
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 1,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1666294
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 96,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1693991
|
||||
},
|
||||
{
|
||||
"operation": "sign",
|
||||
"vector": 2,
|
||||
"message_bytes": 256,
|
||||
"stack_bytes": 3312,
|
||||
"instructions": 1721738
|
||||
},
|
||||
{
|
||||
"operation": "keypair",
|
||||
"vector": 2,
|
||||
"stack_bytes": 2808,
|
||||
"instructions": 1645602
|
||||
},
|
||||
{
|
||||
"operation": "shared_secret",
|
||||
"vector": 2,
|
||||
"stack_bytes": 768,
|
||||
"instructions": 1289681
|
||||
}
|
||||
],
|
||||
"scope": "Actual linked ARM crypto frames/instruction counts only; excludes caller/ISR stacks and physical timing."
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user