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89 lines
1.4 KiB
Go
89 lines
1.4 KiB
Go
// +build !amd64 noasm
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package sip13
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import (
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"encoding/binary"
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"math/bits"
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)
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type sip struct {
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v0, v1, v2, v3 uint64
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}
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func (s *sip) round() {
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s.v0 += s.v1
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s.v2 += s.v3
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s.v1 = bits.RotateLeft64(s.v1, 13)
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s.v3 = bits.RotateLeft64(s.v3, 16)
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s.v1 ^= s.v0
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s.v3 ^= s.v2
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s.v0 = bits.RotateLeft64(s.v0, 32)
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s.v2 += s.v1
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s.v0 += s.v3
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s.v1 = bits.RotateLeft64(s.v1, 17)
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s.v3 = bits.RotateLeft64(s.v3, 21)
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s.v1 ^= s.v2
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s.v3 ^= s.v0
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s.v2 = bits.RotateLeft64(s.v2, 32)
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}
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func Sum64Str(k0, k1 uint64, p string) uint64 {
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return Sum64(k0, k1, []byte(p))
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}
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func Sum64(k0, k1 uint64, p []byte) uint64 {
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s := sip{
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v0: k0 ^ 0x736f6d6570736575,
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v1: k1 ^ 0x646f72616e646f6d,
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v2: k0 ^ 0x6c7967656e657261,
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v3: k1 ^ 0x7465646279746573,
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}
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b := uint64(len(p)) << 56
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for len(p) >= 8 {
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m := binary.LittleEndian.Uint64(p[:8])
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s.v3 ^= m
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s.round()
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s.v0 ^= m
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p = p[8:]
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}
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switch len(p) {
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case 7:
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b |= uint64(p[6]) << 48
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fallthrough
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case 6:
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b |= uint64(p[5]) << 40
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fallthrough
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case 5:
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b |= uint64(p[4]) << 32
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fallthrough
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case 4:
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b |= uint64(p[3]) << 24
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fallthrough
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case 3:
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b |= uint64(p[2]) << 16
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fallthrough
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case 2:
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b |= uint64(p[1]) << 8
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fallthrough
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case 1:
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b |= uint64(p[0])
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}
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// last block
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s.v3 ^= b
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s.round()
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s.v0 ^= b
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// finalization
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s.v2 ^= 0xff
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s.round()
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s.round()
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s.round()
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return s.v0 ^ s.v1 ^ s.v2 ^ s.v3
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}
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