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crypto.go
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crypto.go
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package crypto
import (
"encoding/binary"
"errors"
"fmt"
"math/bits"
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/hmac"
"crypto/md5"
"crypto/rand"
"crypto/sha256"
"hash/crc32"
"golang.org/x/crypto/md4"
)
var (
_ = fmt.Sprintf("")
)
var (
ECBSize = 7
)
func AES_CFB(k []byte, iv []byte, m []byte, decrypt bool) []byte {
c, err := aes.NewCipher(k)
if err != nil {
panic(err)
}
var dst = make([]byte, len(m)+aes.BlockSize)
newCFB8(c, iv, decrypt).XORKeyStream(dst, m)
return dst[:len(m)]
}
func NewAESCFB8(k []byte, iv []byte, decrypt bool) cipher.Stream {
return AESInit(k, iv, decrypt)
}
func AESInit(k []byte, iv []byte, decrypt bool) cipher.Stream {
c, err := aes.NewCipher(k)
if err != nil {
panic(err)
}
return newCFB8(c, iv, decrypt)
}
func AES(handle cipher.Stream, m []byte) []byte {
var dst = make([]byte, len(m))
handle.XORKeyStream(dst, m)
return dst[:len(m)]
}
func ECB(in []byte) []byte {
var out = []byte{
(in[0] >> 1),
((in[0] & 0x01) << 6) | (in[1] >> 2),
((in[1] & 0x03) << 5) | (in[2] >> 3),
((in[2] & 0x07) << 4) | (in[3] >> 4),
((in[3] & 0x0F) << 3) | (in[4] >> 5),
((in[4] & 0x1F) << 2) | (in[5] >> 6),
((in[5] & 0x3F) << 1) | (in[6] >> 7),
((in[6] & 0x7F) >> 0),
}
for i := range out {
out[i] = (out[i] << 1) & 0xFE
}
return out
}
func ECBP(in []byte) []byte {
var out = ECB(in)
for i := range out {
out[i] |= uint8(bits.OnesCount8(out[i])) % 2
}
return out
}
func CBC(b []byte) []byte {
var (
i, pb uint8
res = make([]byte, 8)
)
b = PAD(b, 7)
for ; i < uint8(56); i++ {
if b[i/8]&(1<<(7-(i%8))) > 0 {
pb++
res[i/7] |= 1 << (7 - (i+i/7)%8)
}
if (i+1)%7 == 0 {
res[i/7] |= 1 - (pb % 2)
pb = 0
}
}
return res
}
func PAD(b []byte, n int) []byte {
var cb = make([]byte, n)
for i, vb := range b {
if i >= n {
break
}
cb[i] = vb
}
return cb
}
func DES(k []byte, d []byte) []byte {
var (
res = make([]byte, 8)
)
k = PAD(k, 7)
d = PAD(d, 8)
block, err := des.NewCipher(CBC(k[:7]))
if err != nil {
panic(err)
}
block.Encrypt(res, d)
return res
}
func DES_ECB(k []byte, d []byte) []byte {
var (
res = make([]byte, 8)
)
k = PAD(k, 7)
d = PAD(d, 8)
block, err := des.NewCipher(ECB(k[:7]))
if err != nil {
panic(err)
}
block.Encrypt(res, d)
return res
}
func DESL(k []byte, d []byte) []byte {
k = PAD(PAD(k, 16), 21)
ret := make([]byte, 24)
copy(ret, DES(k[:7], d))
copy(ret[8:], DES(k[7:14], d))
copy(ret[16:], DES(k[14:21], d))
return ret
}
func MD4(ms ...[]byte) ([]byte, error) {
h := md4.New()
for _, m := range ms {
if _, err := h.Write(m); err != nil {
return nil, err
}
}
return h.Sum(nil), nil
}
func HMAC_SHA256(k []byte, ms ...[]byte) []byte {
h := hmac.New(sha256.New, k)
for _, m := range ms {
h.Write(m)
}
return h.Sum(nil)
}
func MD5(ms ...[]byte) ([]byte, error) {
h := md5.New()
for _, m := range ms {
if _, err := h.Write(m); err != nil {
return nil, err
}
}
return h.Sum(nil), nil
}
func HMAC_MD5(k []byte, ms ...[]byte) ([]byte, error) {
h := hmac.New(md5.New, k)
for _, m := range ms {
if _, err := h.Write(m); err != nil {
return nil, err
}
}
return h.Sum(nil), nil
}
func Nonce(n int) ([]byte, error) {
var b = make([]byte, n)
if r, err := rand.Read(b); err != nil {
return nil, err
} else if r != n {
return nil, errors.New("nonce generation number read mismatch.")
}
return b, nil
}
func CRC32(m []byte) ([]byte, error) {
b := make([]byte, 4)
binary.LittleEndian.PutUint32(b, crc32.ChecksumIEEE(m))
return b, nil
}