mirror of
https://github.com/liquidraver/ZephCore.git
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liquidraver
799d694914
- Lift duplicated identity-gen block from main_companion.cpp + main_repeater.cpp into ZephyrRNG::generateFirstBootIdentity(). Both mains shrink from ~40 lines to a 3-line helper call. - Add LocalIdentity::fromSeed() so seed-derived keygen doesn't need a one-shot RNG wrapper; delete SeededRNG. - Drop the per-byte ADC sampling loop: getBattMilliVolts() does an 8-sample average + 10ms regulator settle internally, costing 300-480ms of real wall-time and actively destroying the LSB jitter it was meant to harvest. Jitter mixer already dwarfs it. - Centralize the printk + sys_reboot pattern as Utils::cryptoPanicReboot(); drop the 2000ms pre-reboot k_msleep (printk is synchronous, sleep just blocked the mesh thread on the ZephyrRNG::random() retry-failure path). - Inline sample_cpu_jitter health check via online scalars instead of a 512-byte deltas[] array. Saves 1.5KB stack churn across boot and tracks every sample instead of only the first 128. - extract_via_aes_ctr now uses Utils::sha256 instead of open-coding psa_hash_compute.
51 lines
2.2 KiB
C++
51 lines
2.2 KiB
C++
/*
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* SPDX-License-Identifier: Apache-2.0
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* ZephCore Utils - crypto and helpers (Zephyr port)
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*/
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#pragma once
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#include <mesh/MeshCore.h>
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#include <string.h>
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#include <stddef.h>
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namespace mesh {
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class Utils {
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public:
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static void sha256(uint8_t *hash, size_t hash_len, const uint8_t *msg, int msg_len);
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static void sha256(uint8_t *hash, size_t hash_len, const uint8_t *frag1, int frag1_len, const uint8_t *frag2, int frag2_len);
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static int encrypt(const uint8_t *shared_secret, uint8_t *dest, const uint8_t *src, int src_len);
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static int decrypt(const uint8_t *shared_secret, uint8_t *dest, const uint8_t *src, int src_len);
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static int encryptThenMAC(const uint8_t *shared_secret, uint8_t *dest, const uint8_t *src, int src_len);
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static int MACThenDecrypt(const uint8_t *shared_secret, uint8_t *dest, const uint8_t *src, int src_len);
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/* Constant-time byte-equality. Returns true iff every byte of `a`
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* matches `b`. No early exit — timing is independent of input,
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* defeating timing-leak attacks on MAC/password/secret compares.
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* `volatile` accumulator survives `-Os` LTO — disassembly-verified
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* on Cortex-M4 (rak3401_1watt). Pattern from rweather/arduinolibs. */
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static bool constantTimeEqual(const void *a, const void *b, size_t n);
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/* Securely zero a buffer such that the compiler cannot elide the
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* writes as dead-store optimization. Uses volatile pointer writes —
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* standard idiom for clearing crypto secrets before stack unwind.
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* Use this for any buffer holding key material, seeds, or shared
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* secrets after their last use. */
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static void secureZeroize(void *buf, size_t n);
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/* Log a crypto-invariant failure to printk and cold-reboot.
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* Used when an entropy source, KDF, or other primitive cannot
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* produce a safe result — proceeding would risk weak keys or
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* bypassed authentication, so we restart rather than continue.
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* Does not return. */
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[[noreturn]] static void cryptoPanicReboot(const char *msg);
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static void toHex(char *dest, const uint8_t *src, size_t len);
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static bool fromHex(uint8_t *dest, int dest_size, const char *src_hex);
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static bool isHexChar(char c);
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static int parseTextParts(char *text, const char *parts[], int max_num, char separator = ',');
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};
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} /* namespace mesh */
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