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fumiama
2021-11-21 22:15:35 +08:00
parent d94b730a4e
commit 396bb12a7f
13 changed files with 1571 additions and 1 deletions
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tea_1.16.go Normal file
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//go:build !go1.17 && amd64
// +build !go1.17,amd64
package tea
import (
"encoding/binary"
)
// Encrypt tea 加密
// http://bbs.chinaunix.net/thread-583468-1-1.html
// 感谢xichen大佬对TEA的解释
//go:nosplit
func (t TEA) Decrypt(data []byte) []byte {
if len(data) < 16 || len(data)&7 != 0 {
return nil
}
dst := make([]byte, len(data))
var iv1, iv2, holder uint64
var v0, v1 uint32
for i := 0; i < len(dst); i += 8 {
holder = iv1
iv1 = binary.BigEndian.Uint64(data[i:])
iv2 ^= iv1
v0, v1 = uint32(iv2>>32), uint32(iv2)
v1 -= (v0 + 0xe3779b90) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xe3779b90) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x454021d7) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x454021d7) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0xa708a81e) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xa708a81e) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x08d12e65) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x08d12e65) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x6a99b4ac) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x6a99b4ac) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0xcc623af3) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xcc623af3) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x2e2ac13a) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x2e2ac13a) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x8ff34781) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x8ff34781) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0xf1bbcdc8) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xf1bbcdc8) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x5384540f) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x5384540f) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0xb54cda56) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xb54cda56) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x1715609d) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x1715609d) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x78dde6e4) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x78dde6e4) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0xdaa66d2b) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0xdaa66d2b) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x3c6ef372) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x3c6ef372) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
v1 -= (v0 + 0x9e3779b9) ^ ((v0 << 4) + t[2]) ^ ((v0 >> 5) + t[3])
v0 -= (v1 + 0x9e3779b9) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
iv2 = uint64(v0)<<32 | uint64(v1)
binary.BigEndian.PutUint64(dst[i:], iv2^holder)
}
return dst[dst[0]&7+3 : len(data)-7]
}
//go:nosplit
func NewTeaCipher(key []byte) (t TEA) {
if len(key) == 16 {
t[3] = binary.BigEndian.Uint32(key[12:])
t[2] = binary.BigEndian.Uint32(key[8:])
t[1] = binary.BigEndian.Uint32(key[4:])
t[0] = binary.BigEndian.Uint32(key[0:])
}
return
}