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https://github.com/rstrouse/ESPSomfy-RTS.git
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97d8a90da8
- Load the token key in Web::startup(), before either web server starts, so no token can be made with the all-zero key; log a failed pref.begin(). - createAPIToken checks mbedtls' return codes. On a failure it leaves the token empty, which tokenMatches never accepts, instead of hex from uninitialised stack. - API_TOKEN_SIZE in ApiToken.h replaces the five char[65] buffers; the HMAC's description moves to createAPIToken, with the None form. - handleLogin builds the candidate token once and compares it once. - e2e: the serverId test skips on `secured` like its neighbours, names its values, and says it assumes the device sees this PC's address. - KNOWN_ISSUES keeps #81, which #108 removes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
28 lines
1 KiB
C
28 lines
1 KiB
C
#ifndef apitoken_h
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#define apitoken_h
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#include <stddef.h>
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#include <stdint.h>
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// The token key's size: 32 random bytes the device makes on first boot and
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// keeps in NVS. It never leaves the device.
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#define API_TOKEN_KEY_SIZE 32
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// A token's buffer: an HMAC-SHA256 in hex and its terminator.
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#define API_TOKEN_SIZE 65
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// True when given is the expected token. It takes the same time whatever
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// given holds, so the time doesn't tell how much of a guess was right. Only
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// expected's length shows, and every token has the same one. An empty
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// expected token, which is what a failed HMAC leaves, matches nothing.
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inline bool tokenMatches(const char *expected, const char *given) {
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if(!expected || !given || !expected[0]) return false;
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uint8_t diff = 0;
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for(size_t i = 0; expected[i]; i++) {
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diff |= (uint8_t)(expected[i] ^ *given);
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// A shorter given compares its terminator with the rest of expected.
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if(*given) given++;
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}
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// A longer given doesn't match either.
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diff |= (uint8_t)*given;
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return diff == 0;
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}
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#endif
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