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feat(util): add HMAC-SHA1 utility function

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fallenoak 2023-03-23 22:56:59 -05:00
parent fc622cceed
commit 1246a5a4da
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2 changed files with 46 additions and 0 deletions
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38
src/util/HMAC.cpp Normal file
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#include "util/HMAC.hpp"
#include <cstring>
#include <common/SHA1.hpp>
#define HMAC_SHA1_IPAD 0x36
#define HMAC_SHA1_OPAD 0x5C
#define HMAC_SHA1_BLOCK_SIZE 64
void HMAC_SHA1(const uint8_t* key, uint32_t keyLen, const uint8_t* data, uint32_t dataLen, uint8_t* out) {
uint8_t ibuf[HMAC_SHA1_BLOCK_SIZE], obuf[HMAC_SHA1_BLOCK_SIZE];
for (uint32_t i = 0; i < keyLen; i++) {
ibuf[i] = key[i] ^ HMAC_SHA1_IPAD;
obuf[i] = key[i] ^ HMAC_SHA1_OPAD;
}
for (uint32_t i = keyLen; i < HMAC_SHA1_BLOCK_SIZE; i++) {
ibuf[i] = HMAC_SHA1_IPAD;
obuf[i] = HMAC_SHA1_OPAD;
}
SHA1_CONTEXT ctx;
uint8_t idigest[SHA1_DIGEST_SIZE];
// Inner
SHA1_Init(&ctx);
SHA1_Update(&ctx, ibuf, HMAC_SHA1_BLOCK_SIZE);
SHA1_Update(&ctx, data, dataLen);
SHA1_Final(idigest, &ctx);
// Outer
SHA1_Init(&ctx);
SHA1_Update(&ctx, obuf, HMAC_SHA1_BLOCK_SIZE);
SHA1_Update(&ctx, idigest, SHA1_DIGEST_SIZE);
SHA1_Final(out, &ctx);
}

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src/util/HMAC.hpp Normal file
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#ifndef UTIL_HMAC_HPP
#define UTIL_HMAC_HPP
#include <cstdint>
void HMAC_SHA1(const uint8_t* key, uint32_t keyLen, const uint8_t* data, uint32_t dataLen, uint8_t* out);
#endif