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29 #include "utils/steering_data.hpp"
32 #include <mbedtls/sha256.h>
34 #include "utils/crc16.hpp"
38 void SteeringData::Init(uint8_t aLength)
40 assert(aLength <= kMaxSizeOfBloomFilter);
47 void SteeringData::ComputeJoinerId(const uint8_t *aEui64, uint8_t *aJoinerId)
49 const size_t kSizeHashSha256Output = 32;
50 const size_t kSizeEui64 = 8;
51 uint8_t hash[kSizeHashSha256Output];
52 mbedtls_sha256_context sha256;
54 mbedtls_sha256_init(&sha256);
55 mbedtls_sha256_starts(&sha256, 0);
56 mbedtls_sha256_update(&sha256, aEui64, kSizeEui64);
57 mbedtls_sha256_finish(&sha256, hash);
59 memcpy(aJoinerId, hash, kSizeJoinerId);
63 void SteeringData::ComputeBloomFilter(const uint8_t *aJoinerId)
65 Crc16 ccitt(Crc16::kCcitt);
66 Crc16 ansi(Crc16::kAnsi);
67 const uint16_t numBits = mLength * 8;
69 for (size_t i = 0; i < kSizeJoinerId; i++)
71 uint8_t byte = aJoinerId[i];
76 SetBit(static_cast<uint8_t>(ccitt.Get() % numBits));
77 SetBit(static_cast<uint8_t>(ansi.Get() % numBits));