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Add comments explaining UUID generation

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This commit is contained in:
Robert Müller 2023-02-20 20:05:26 +01:00
parent d347bfcbe9
commit 12e8f19421
1 changed files with 7 additions and 0 deletions
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7
src/engine/shared/uuid_manager.cpp
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@ -15,8 +15,11 @@ CUuid RandomUuid()
CUuid Result;
secure_random_fill(&Result, sizeof(Result));
// set version 4 (UUID is randomly generated)
Result.m_aData[6] &= 0x0f;
Result.m_aData[6] |= 0x40;
// set variant 1 (RFC 4122)
Result.m_aData[8] &= 0x3f;
Result.m_aData[8] |= 0x80;
@ -38,10 +41,14 @@ CUuid CalculateUuid(const char *pName)
Result.m_aData[i] = Digest.data[i];
}
// set version 3 (UUID is generated by MD5 hashing a namespace identifier and a name)
Result.m_aData[6] &= 0x0f;
Result.m_aData[6] |= 0x30;
// set variant 1 (RFC 4122)
Result.m_aData[8] &= 0x3f;
Result.m_aData[8] |= 0x80;
return Result;
}