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sha512.go
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sha512.go
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package password // import "github.com/nathanaelle/password/v2"
import (
"crypto/sha512"
"crypto/subtle"
"fmt"
"strings"
)
type (
sha512driver struct {
rounds int
}
sha512pwd struct {
rounds int
salt []byte
hashed [86]byte
}
)
const (
sha512MinRounds = 1000
sha512MaxRounds = 999999999
sha512DefRounds = 5000
sha512Prefix = "$6$"
)
// SHA512 is the exported driver for SHA512-CRYPT
var SHA512 = register(sha512driver{sha512DefRounds})
func (d sha512driver) String() string {
return "{SHA512-CRYPT}"
}
func (d sha512driver) Options() map[string]interface{} {
return map[string]interface{}{
"rounds": d.rounds,
}
}
func (d sha512driver) SetOptions(o map[string]interface{}) Definition {
iv, ok := o["rounds"]
if !ok {
return d
}
v, ok := iv.(int)
if !ok {
return d
}
return sha512driver{bounded(sha512MinRounds, v, sha512MaxRounds)}
}
func (d sha512driver) Default() Crypter {
return &sha512pwd{
rounds: d.rounds,
}
}
func (d sha512driver) Crypt(pwd, salt []byte, options map[string]interface{}) string {
return d.SetOptions(options).Default().Salt(salt).Crypt(pwd).String()
}
func (d sha512driver) CrypterFound(str string) (Crypter, bool) {
if len(str) < len(sha512Prefix) || str[0:len(sha512Prefix)] != sha512Prefix {
return nil, false
}
p := new(sha512pwd)
if err := p.Set(str); err != nil {
return nil, false
}
return p, true
}
func (p *sha512pwd) Salt(salt []byte) Crypter {
if salt == nil || len(salt) == 0 {
return &sha512pwd{p.rounds, getrandh64(16), p.hashed}
}
var s [16]byte
l := copy(s[:], salt)
return &sha512pwd{p.rounds, s[0:l], p.hashed}
}
func (p *sha512pwd) Hashed(hashed []byte) Crypter {
var s [86]byte
if hashed == nil || len(hashed) == 0 {
return &sha512pwd{p.rounds, p.salt, s}
}
copy(s[:], hashed)
return &sha512pwd{p.rounds, p.salt, s}
}
func (p *sha512pwd) Options() map[string]interface{} {
return p.Definition().Options()
}
func (p *sha512pwd) Definition() Definition {
return sha512driver{p.rounds}
}
func (p *sha512pwd) Crypt(pwd []byte) Crypter {
np := new(sha512pwd)
*np = *p
hashed := p.crypt(pwd)
copy(np.hashed[:], h64Encode(hashed[:]))
return np
}
func (p *sha512pwd) String() string {
hashencoded := string(p.hashed[:])
saltencoded := string(p.salt)
if p.rounds == sha512DefRounds {
return fmt.Sprintf(sha512Prefix+"%s$%s", saltencoded, hashencoded)
}
return fmt.Sprintf(sha512Prefix+"rounds=%d$%s$%s", p.rounds, saltencoded, hashencoded)
}
func (p *sha512pwd) Verify(pwd []byte) bool {
if pwd == nil || len(pwd) == 0 {
return false
}
h := p.crypt(pwd)
he := h64Encode(h[:])
return (subtle.ConstantTimeCompare(he, p.hashed[:]) == 1)
}
func (p *sha512pwd) Set(str string) error {
if p == nil {
return ERR_NOPE
}
if len(str) < len(sha512Prefix) || str[0:len(sha512Prefix)] != sha512Prefix {
return ERR_NOPE
}
if len(str) == len(sha512Prefix) {
*p = sha512pwd{rounds: sha512DefRounds}
return nil
}
list := strings.SplitN(str[len(sha512Prefix):], "$", 3)
if list[len(list)-1] == "" {
list = list[:len(list)-1]
}
opt := options(list[0])
if opt == nil {
np := (&sha512pwd{rounds: sha512DefRounds}).Salt([]byte(list[0]))
switch len(list) {
case 1:
*p = *(np.(*sha512pwd))
return nil
case 2:
*p = *(np.Hashed([]byte(list[1])).(*sha512pwd))
return nil
}
return ERR_NOPE
}
sr, ok := optionInt(opt, "rounds", sha512DefRounds)
if !ok {
return ERR_NOPE
}
np := (&sha512pwd{rounds: bounded(sha512MinRounds, sr, sha512MaxRounds)})
switch len(list) {
case 1:
*p = *np
return nil
case 2:
*p = *(np.Salt([]byte(list[1])).(*sha512pwd))
return nil
case 3:
*p = *(np.Salt([]byte(list[1])).Hashed([]byte(list[2])).(*sha512pwd))
return nil
}
return ERR_NOPE
}
func (p *sha512pwd) MarshalText() ([]byte, error) {
return []byte(p.String()), nil
}
func (p *sha512pwd) crypt(pwd []byte) [64]byte {
sumB := commonSum(sha512.New(), pwd, p.salt, pwd).Sum(nil)
A := commonSum(sha512.New(), pwd, p.salt, repeatBytes(sumB, len(pwd)))
sumA := commonSum(A, commonMixer(len(pwd), sumB, pwd)...).Sum(nil)
sumP := repeatBytes(commonSum(sha512.New(), multiplyBytes(pwd, len(pwd))...).Sum(nil), len(pwd))
sumS := repeatBytes(commonSum(sha512.New(), multiplyBytes(p.salt, (16+int(sumA[0])))...).Sum(nil), len(p.salt))
sumC := sumA
for i := 0; i < p.rounds; i++ {
sumC = commonSum(sha512.New(), commonDispatch(i, sumC, sumP, sumS)...).Sum(nil)
}
return [64]byte{
sumC[42], sumC[21], sumC[0],
sumC[1], sumC[43], sumC[22],
sumC[23], sumC[2], sumC[44],
sumC[45], sumC[24], sumC[3],
sumC[4], sumC[46], sumC[25],
sumC[26], sumC[5], sumC[47],
sumC[48], sumC[27], sumC[6],
sumC[7], sumC[49], sumC[28],
sumC[29], sumC[8], sumC[50],
sumC[51], sumC[30], sumC[9],
sumC[10], sumC[52], sumC[31],
sumC[32], sumC[11], sumC[53],
sumC[54], sumC[33], sumC[12],
sumC[13], sumC[55], sumC[34],
sumC[35], sumC[14], sumC[56],
sumC[57], sumC[36], sumC[15],
sumC[16], sumC[58], sumC[37],
sumC[38], sumC[17], sumC[59],
sumC[60], sumC[39], sumC[18],
sumC[19], sumC[61], sumC[40],
sumC[41], sumC[20], sumC[62],
sumC[63],
}
}