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f55fd7d9f2
We need to compute SHA256 hashes for a __code_signature section, so recomputing a SHA256 hash of an entire file for an LC_UUID is a waste of time. We can instead compute it as a tree hash.
21 lines
430 B
C++
21 lines
430 B
C++
#include "mold.h"
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#include <random>
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namespace mold {
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std::array<u8, 16> get_uuid_v4() {
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std::array<u8, 16> bytes;
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std::random_device rand;
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u32 buf[4] = { rand(), rand(), rand(), rand() };
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memcpy(bytes.data(), buf, 16);
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// Indicate that this is UUIDv4 as defined by RFC4122.
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bytes[6] = (bytes[6] & 0b00001111) | 0b01000000;
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bytes[8] = (bytes[8] & 0b00111111) | 0b10000000;
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return bytes;
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}
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} // namespace mold
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