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package dns

import (
"crypto/dsa"
"crypto/ecdsa"
"crypto/rsa"
"io"
"math/big"
"strings"
)

func (k *RR_DNSKEY) NewPrivateKey(s string) (PrivateKey, error) {
if s[len(s)-1] != '\n' { // We need a closing newline
return k.ReadPrivateKey(strings.NewReader(s+"\n"), "")
}
return k.ReadPrivateKey(strings.NewReader(s), "")
}

// NewPrivateKey reads a private key from the io.Reader q. The public key must be
// known, because some cryptographics algorithms embed the public inside the privatekey.
func (k *RR_DNSKEY) ReadPrivateKey(q io.Reader, file string) (PrivateKey, error) {
m, e := parseKey(q, file)
if m == nil {
return nil, e
}
if _, ok := m["private-key-format"]; !ok {
return nil, ErrPrivKey
}
if m["private-key-format"] != "v1.2" && m["private-key-format"] != "v1.3" {
return nil, ErrPrivKey
}
// TODO(mg): check if the pubkey matches the private key
switch m["algorithm"] {
case "3 (DSA)":
p, e := readPrivateKeyDSA(m)
if e != nil {
return nil, e
}
if !k.setPublicKeyInPrivate(p) {
return nil, ErrPrivKey
}
return p, e
case "1 (RSAMD5)":
fallthrough
case "5 (RSASHA1)":
fallthrough
case "7 (RSASHA1NSEC3SHA1)":
fallthrough
case "8 (RSASHA256)":
fallthrough
case "10 (RSASHA512)":
p, e := readPrivateKeyRSA(m)
if e != nil {
return nil, e
}
if !k.setPublicKeyInPrivate(p) {
return nil, ErrPrivKey
}
return p, e
case "12 (ECC-GOST)":
p, e := readPrivateKeyGOST(m)
if e != nil {
return nil, e
}
// setPublicKeyInPrivate(p)
return p, e
case "13 (ECDSAP256SHA256)":
fallthrough
case "14 (ECDSAP384SHA384)":
p, e := readPrivateKeyECDSA(m)
if e != nil {
return nil, e
}
if !k.setPublicKeyInPrivate(p) {
return nil, ErrPrivKey
}
return p, e
}
return nil, ErrPrivKey
}

// Read a private key (file) string and create a public key. Return the private key.
func readPrivateKeyRSA(m map[string]string) (PrivateKey, error) {
p := new(rsa.PrivateKey)
p.Primes = []*big.Int{nil, nil}
for k, v := range m {
switch k {
case "modulus", "publicexponent", "privateexponent", "prime1", "prime2":
v1, err := packBase64([]byte(v))
if err != nil {
return nil, err
}
switch k {
case "modulus":
p.PublicKey.N = big.NewInt(0)
p.PublicKey.N.SetBytes(v1)
case "publicexponent":
i := big.NewInt(0)
i.SetBytes(v1)
p.PublicKey.E = int(i.Int64()) // int64 should be large enough
case "privateexponent":
p.D = big.NewInt(0)
p.D.SetBytes(v1)
case "prime1":
p.Primes[0] = big.NewInt(0)
p.Primes[0].SetBytes(v1)
case "prime2":
p.Primes[1] = big.NewInt(0)
p.Primes[1].SetBytes(v1)
}
case "exponent1", "exponent2", "coefficient":
// not used in Go (yet)
case "created", "publish", "activate":
// not used in Go (yet)
}
}
return p, nil
}

func readPrivateKeyDSA(m map[string]string) (PrivateKey, error) {
p := new(dsa.PrivateKey)
p.X = big.NewInt(0)
for k, v := range m {
switch k {
case "private_value(x):":
v1, err := packBase64([]byte(v))
if err != nil {
return nil, err
}
p.X.SetBytes(v1)
case "created:", "publish:", "activate:":
/* not used in Go (yet) */
}
}
return p, nil
}

func readPrivateKeyECDSA(m map[string]string) (PrivateKey, error) {
p := new(ecdsa.PrivateKey)
p.D = big.NewInt(0)
// Need to check if we have everything
for k, v := range m {
switch k {
case "privatekey:":
v1, err := packBase64([]byte(v))
if err != nil {
return nil, err
}
p.D.SetBytes(v1)
case "created:", "publish:", "activate:":
/* not used in Go (yet) */
}
}
return p, nil
}

func readPrivateKeyGOST(m map[string]string) (PrivateKey, error) {
// p := new(ecdsa.PrivateKey)
// p.D = big.NewInt(0)
// Need to check if we have everything
for k, v := range m {
switch k {
case "gostasn1:":
v1, err := packBase64([]byte(v))
if err != nil {
return nil, err
}
v1 = v1
//p.D.SetBytes(v1)
case "created:", "publish:", "activate:":
/* not used in Go (yet) */
}
}
return nil, nil
}

// parseKey reads a private key from r. It returns a map[string]string,
// with the key-value pairs, or an error when the file is not correct.
func parseKey(r io.Reader, file string) (map[string]string, error) {
s := scanInit(r)
m := make(map[string]string)
c := make(chan lex)
k := ""
// Start the lexer
go klexer(s, c)
for l := range c {
// It should alternate
switch l.value {
case _KEY:
k = l.token
case _VALUE:
if k == "" {
return nil, &ParseError{file, "no private key seen", l}
}
//println("Setting", strings.ToLower(k), "to", l.token, "b")
m[strings.ToLower(k)] = l.token
k = ""
}
}
return m, nil
}

// klexer scans the sourcefile and returns tokens on the channel c.
func klexer(s *scan, c chan lex) {
var l lex
str := "" // Hold the current read text
commt := false
key := true
x, err := s.tokenText()
defer close(c)
for err == nil {
l.column = s.position.Column
l.line = s.position.Line
switch x {
case ':':
if commt {
break
}
l.token = str
if key {
l.value = _KEY
c <- l
// Next token is a space, eat it
s.tokenText()
key = false
str = ""
} else {
l.value = _VALUE
}
case ';':
commt = true
case '\n':
if commt {
// Reset a comment
commt = false
}
l.value = _VALUE
l.token = str
c <- l
str = ""
commt = false
key = true
default:
if commt {
break
}
str += string(x)
}
x, err = s.tokenText()
}
if len(str) > 0 {
// Send remainder
l.token = str
l.value = _VALUE
c <- l
}
}
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