15 lines
359 B
C
15 lines
359 B
C
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#include <utsm/crypto.h>
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static u64 mix64_tweak(u64 x) {
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x ^= x >> 33;
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x *= 0xff51afd7ed558ccdULL;
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x ^= x >> 33;
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x *= 0xc4ceb9fe1a85ec53ULL;
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x ^= x >> 33;
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return x;
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}
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u64 utsm_make_tweak(u64 tweak_seed, u64 line_index, u64 key_epoch) {
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return mix64_tweak(tweak_seed ^ (line_index * 0x9e3779b97f4a7c15ULL) ^ (key_epoch << 32));
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}
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