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helpers.go
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/
helpers.go
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package password // import "github.com/nathanaelle/password/v2"
import (
"crypto/rand"
"encoding/base64"
"fmt"
"hash"
"strconv"
"strings"
)
var rawbase64 = base64.RawStdEncoding
var bc64 = base64.NewEncoding("./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789").WithPadding(base64.NoPadding)
func getrand(l int) []byte {
if l < 1 || l > 65536 {
panic("get rand size <l> is not valid")
}
ret := make([]byte, l)
_, err := rand.Read(ret)
if err != nil {
panic(err)
}
return ret
}
func getrandh64(l int) []byte {
if l < 1 || l > 65536 {
panic("get rand size <l> is not valid")
}
t := make([]byte, l)
_, err := rand.Read(t)
if err != nil {
panic(err)
}
ret := h64Encode(t)
return ret[:l]
}
func optionsSingleInt(str, optName string, maxLen int) map[string]interface{} {
if str == "" {
return nil
}
if len(str) > maxLen {
return nil
}
v, err := strconv.Atoi(str)
if err != nil {
return nil
}
ret := make(map[string]interface{})
ret[optName] = v
return ret
}
func options(str string) map[string]interface{} {
if str == "" {
return nil
}
if !strings.Contains(str, "=") {
return nil
}
list := strings.Split(str, ",")
ret := make(map[string]interface{})
for _, tok := range list {
kv := strings.SplitN(tok, "=", 2)
if len(kv) == 2 {
ret[kv[0]] = kv[1]
}
}
return ret
}
func optionInt(opt map[string]interface{}, k string, def int) (int, bool) {
if opt == nil {
return def, true
}
ienc, ok := opt[k]
if !ok {
return def, true
}
switch enc := ienc.(type) {
case string:
v, err := strconv.Atoi(enc)
if err != nil {
return 0, false
}
return v, true
case int:
return enc, true
}
return 0, false
}
func assert(t bool, i interface{}) {
if !t {
panic(i)
}
}
func bounded(min, v, max int) int {
if v < min {
return min
}
if v > max {
return max
}
return v
}
func repeatBytes(src []byte, lenDest int) []byte {
dest := make([]byte, 0, lenDest)
lenSrc := len(src)
mod := lenDest % lenSrc
rounds := (lenDest - mod)
if rounds > 0 {
for i := 0; i < rounds; i += lenSrc {
dest = append(dest, src...)
}
}
if mod != 0 {
dest = append(dest, src[0:mod]...)
}
assert(len(dest) == lenDest, fmt.Errorf("lenDest [%d] != len(dest) [%d] lenSrc [%d]", lenDest, len(dest), lenSrc))
return dest
}
func multiplyBytes(src []byte, scalar int) [][]byte {
ret := make([][]byte, scalar)
for i := range ret {
ret[i] = src
}
return ret
}
const (
h64 string = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
)
func h64Encode(src []byte) []byte {
if len(src) == 0 {
return nil
}
hashSize := len(src) * 4 / 3
if (len(src) % 3) != 0 {
hashSize++
}
hash := make([]byte, hashSize)
dst := hash
for len(src) > 0 {
switch len(src) {
default:
dst[0] = h64[src[0]&0x3f]
dst[1] = h64[((src[0]>>6)|(src[1]<<2))&0x3f]
dst[2] = h64[((src[1]>>4)|(src[2]<<4))&0x3f]
dst[3] = h64[(src[2]>>2)&0x3f]
src = src[3:]
dst = dst[4:]
case 2:
dst[0] = h64[src[0]&0x3f]
dst[1] = h64[((src[0]>>6)|(src[1]<<2))&0x3f]
dst[2] = h64[(src[1]>>4)&0x3f]
src = src[2:]
dst = dst[3:]
case 1:
dst[0] = h64[src[0]&0x3f]
dst[1] = h64[(src[0]>>6)&0x3f]
src = src[1:]
dst = dst[2:]
}
}
return hash
}
// used in SHA256-CRYPT SHA512-CRYPT MD5-CRYPT
func commonSum(h hash.Hash, vec ...[]byte) hash.Hash {
for _, s := range vec {
h.Write(s)
}
return h
}
// used in SHA256-CRYPT SHA512-CRYPT
func commonDispatch(i int, sumC, sumP, sumS []byte) [][]byte {
if i%42 == 0 {
return [][]byte{sumC, sumP}
}
if i%21 == 0 {
return [][]byte{sumP, sumC}
}
if i%14 == 0 {
return [][]byte{sumC, sumS, sumP}
}
if i%7 == 0 {
return [][]byte{sumP, sumS, sumC}
}
if i%6 == 0 {
return [][]byte{sumC, sumP, sumP}
}
if i%3 == 0 {
return [][]byte{sumP, sumP, sumC}
}
if i%2 == 0 {
return [][]byte{sumC, sumS, sumP, sumP}
}
return [][]byte{sumP, sumS, sumP, sumC}
}
func commonMixer(l int, caseA, caseB []byte) (ret [][]byte) {
for i := l; i > 0; i >>= 1 {
if (i % 2) != 0 {
ret = append(ret, caseA)
} else {
ret = append(ret, caseB)
}
}
return
}