/
md5.go
214 lines (160 loc) · 4.1 KB
/
md5.go
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package password // import "github.com/nathanaelle/password"
import (
"strings"
"fmt"
"crypto/subtle"
"crypto/md5"
)
type (
md5driver struct{
prefix string
}
md5pwd struct{
prefix string
salt []byte
hashed [22]byte
}
)
const (
md5_def_rounds = 1000
md5_prefix = "$1$"
apr1_prefix = "$apr1$"
)
var MD5 Definition = md5driver{ md5_prefix }
var APR1 Definition = md5driver{ apr1_prefix }
func (d md5driver)String() string {
switch d.prefix {
case apr1_prefix:
return "{APR1-CRYPT}"
case md5_prefix:
return "{MD5-CRYPT}"
}
panic(ErrUnknownMD5Prefix)
}
func (d md5driver)Options() map[string]interface{} {
return map[string]interface{} {
}
}
func (d md5driver)SetOptions(o map[string]interface{}) Definition {
return md5driver { d.prefix }
}
func (d md5driver)Default() Crypter {
return &md5pwd{ prefix: d.prefix }
}
func (d md5driver)Crypt(pwd, salt []byte, options map[string]interface{}) string {
return d.SetOptions(options).Default().Salt(salt).Crypt(pwd).String()
}
func (d md5driver)CrypterFound(str string) (Crypter,bool) {
if _, ok := dispatch_md5_prefix(str); !ok {
return nil, false
}
p := new(md5pwd)
if err := p.Set(str); err != nil {
return nil, false
}
return p, true
}
func (p *md5pwd)Salt(salt []byte) Crypter {
if salt == nil || len(salt) == 0 {
return &md5pwd{ p.prefix, getrandh64(8), p.hashed }
}
var s [8]byte
l := copy(s[:], salt)
return &md5pwd{ p.prefix, s[0:l], p.hashed }
}
func (p *md5pwd)Hashed(hashed []byte) Crypter {
var s [22]byte
if hashed == nil || len(hashed) == 0 {
return &md5pwd{ p.prefix, p.salt, s }
}
copy(s[:], hashed)
return &md5pwd{ p.prefix, p.salt, s }
}
func (p *md5pwd) Options() map[string]interface{} {
return p.Definition().Options()
}
func (p *md5pwd) Definition() Definition {
return md5driver{}
}
func (p *md5pwd) Crypt(pwd []byte) Crypter {
np := new(md5pwd)
*np = *p
hashed := p.crypt(pwd)
copy(np.hashed[:], h64Encode(hashed[:]))
return np
}
func (p *md5pwd) String() string {
hashencoded := string(p.hashed[:])
saltencoded := string(p.salt)
return fmt.Sprintf(p.prefix+"%s$%s", saltencoded, hashencoded)
}
func (p *md5pwd) Verify(pwd []byte) bool {
h := p.crypt(pwd)
he := h64Encode(h[:])
return (subtle.ConstantTimeCompare(he, p.hashed[:]) == 1)
}
func dispatch_md5_prefix(str string) (string,bool) {
is_md5 := (len(str) >+ len(md5_prefix) && str[0:len(md5_prefix)] == md5_prefix)
is_apr1 := (len(str) >+ len(apr1_prefix) && str[0:len(apr1_prefix)] == apr1_prefix)
switch {
case is_md5:
return md5_prefix, true
case is_apr1:
return apr1_prefix, true
}
return "", false
}
func (p *md5pwd)Set(str string) error {
if p == nil {
return ERR_NOPE
}
my_prefix, ok := dispatch_md5_prefix(str)
if !ok {
return ERR_NOPE
}
if len(str) == len(my_prefix) {
*p = md5pwd{ prefix: my_prefix, }
return nil
}
list := strings.SplitN(str[len(my_prefix):], "$", 3)
if list[len(list)-1] == "" {
list = list[:len(list)-1]
}
switch(len(list)) {
case 1:
np := (&md5pwd{ prefix: my_prefix }).Salt([]byte(list[0]))
*p = *(np.(*md5pwd))
return nil
case 2:
np := (&md5pwd{ prefix: my_prefix }).Salt([]byte(list[0]))
*p = *(np.Hashed([]byte(list[1])).(*md5pwd))
return nil
}
return ERR_NOPE
}
func (p *md5pwd) MarshalText() ([]byte, error) {
return []byte(p.String()), nil
}
func (p *md5pwd) crypt(pwd []byte) [16]byte {
var sumA []byte
sumB := common_sum( md5.New(), pwd, p.salt, pwd).Sum(nil)
if len(pwd) < 1 {
A := common_sum( md5.New(), pwd, []byte(p.prefix), p.salt, repeat_bytes(sumB, len(pwd)) )
sumA = common_sum(A, common_mixer(len(pwd), []byte{0}, []byte{0})...).Sum(nil)
} else {
A := common_sum( md5.New(), pwd, []byte(p.prefix), p.salt, repeat_bytes(sumB, len(pwd)) )
sumA = common_sum(A, common_mixer(len(pwd), []byte{0}, pwd[0:1])...).Sum(nil)
}
sumC := sumA
for i := 0; i < md5_def_rounds; i++ {
sumC = common_sum( md5.New(), common_dispatch(i, sumC, pwd, p.salt)... ).Sum(nil)
}
return [16]byte{
sumC[12], sumC[6], sumC[0],
sumC[13], sumC[7], sumC[1],
sumC[14], sumC[8], sumC[2],
sumC[15], sumC[9], sumC[3],
sumC[5], sumC[10], sumC[4],
sumC[11],
}
}