49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
|
package dns
|
||
|
|
|
||
|
|
import (
|
||
|
|
"os"
|
||
|
|
"crypto/rsa"
|
||
|
|
"crypto/rand"
|
||
|
|
"encoding/base64"
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
// Generate a RSA key of the given bit size.
|
||
|
|
// The public parts are directly put inside the
|
||
|
|
// DNSKEY record. The private key is returned.
|
||
|
|
func (r *RR_DNSKEY) GenerateRSA(bits int) (*rsa.PrivateKey, os.Error) {
|
||
|
|
/*
|
||
|
|
-b <key size in bits>:
|
||
|
|
RSAMD5: [512..4096]
|
||
|
|
RSASHA1: [512..4096]
|
||
|
|
NSEC3RSASHA1: [512..4096]
|
||
|
|
RSASHA256: [512..4096]
|
||
|
|
RSASHA512: [1024..4096]
|
||
|
|
*/
|
||
|
|
priv, err := rsa.GenerateKey(rand.Reader, bits)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
//func GenerateKey(rand io.Reader, bits int) (priv *PrivateKey, err os.Error)
|
||
|
|
// Fill r.PubKey string "base64"
|
||
|
|
//priv.PublicKey.N (*big.Int) modulus
|
||
|
|
//priv.PublicKey.E (int) public exponent
|
||
|
|
keybuf := make([]byte, 1)
|
||
|
|
|
||
|
|
if priv.PublicKey.E < 256 {
|
||
|
|
keybuf[0] = uint8(priv.PublicKey.E)
|
||
|
|
} else {
|
||
|
|
keybuf[0] = 0
|
||
|
|
// keybuf[1]+[2] have the length
|
||
|
|
// keybuf[3:..3+lenght] have exponent
|
||
|
|
// not implemented
|
||
|
|
return nil, &Error{Error: "Exponent to large"}
|
||
|
|
}
|
||
|
|
keybuf = append(keybuf, priv.PublicKey.N.Bytes()...)
|
||
|
|
|
||
|
|
b64 := make([]byte, base64.StdEncoding.EncodedLen(len(keybuf)))
|
||
|
|
base64.StdEncoding.Encode(b64, keybuf)
|
||
|
|
r.PubKey = string(b64)
|
||
|
|
return priv, nil
|
||
|
|
}
|