/
rsa_generator.go
144 lines (122 loc) · 3.11 KB
/
rsa_generator.go
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package sign
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/base64"
"encoding/gob"
"encoding/pem"
)
type RsaGenerator struct {
privateKey rsa.PrivateKey
publicKey rsa.PublicKey
bitSize int
}
func NewRsaGenerator(bitSize int) (*RsaGenerator, error) {
reader := rand.Reader
if privateKey, err := rsa.GenerateKey(reader, bitSize); err != nil {
return nil, err
} else {
generator := &RsaGenerator{}
publicKey := privateKey.PublicKey
generator.publicKey = publicKey
generator.privateKey = *privateKey
generator.bitSize = bitSize
return generator, nil
}
}
func NewRsa2048Generator() (*RsaGenerator, error) {
return NewRsaGenerator(2048)
}
func NewRsa3072Generator() (*RsaGenerator, error) {
return NewRsaGenerator(3072)
}
func NewRsa4096Generator() (*RsaGenerator, error) {
return NewRsaGenerator(4096)
}
func (g *RsaGenerator) GenerateKeyOfPrivateKey() ([]byte, error) {
return saveGobKey(g.privateKey)
}
func (g *RsaGenerator) GenerateBase64KeyOfPrivateKey() (string, error) {
if key, e := g.GenerateKeyOfPrivateKey(); e != nil {
return "", e
} else {
return base64.StdEncoding.EncodeToString(key), nil
}
}
func (g *RsaGenerator) GeneratePemPrivateKey() (string, error) {
return savePEMKey(&g.privateKey)
}
func (g *RsaGenerator) GeneratePemPrivatePKCS1Key() (string, error) {
return savePEMPrivatePKCS1Key(&g.privateKey)
}
func (g *RsaGenerator) GeneratePemPublicKey() (string, error) {
return savePublicPEMKey(g.publicKey)
}
func (g *RsaGenerator) GeneratePemPublicPKIXKey() (string, error) {
return savePublicPKIXKey(g.publicKey)
}
func saveGobKey(key interface{}) ([]byte, error) {
buffer := &bytes.Buffer{}
encoder := gob.NewEncoder(buffer)
if err := encoder.Encode(key); err != nil {
return nil, err
} else {
return buffer.Bytes(), nil
}
}
func savePEMKey(key *rsa.PrivateKey) (string, error) {
var privateKey = &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
return pemToString(privateKey)
}
func savePEMPrivatePKCS1Key(privateKey *rsa.PrivateKey) (string, error) {
asn1Bytes := x509.MarshalPKCS1PrivateKey(privateKey)
var pemkey = &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: asn1Bytes,
}
return pemToString(pemkey)
}
func savePublicPEMKey(pubkey rsa.PublicKey) (string, error) {
if asn1Bytes, err := asn1.Marshal(pubkey); err != nil {
return "", err
} else {
var pemkey = &pem.Block{
Type: "PUBLIC KEY",
Bytes: asn1Bytes,
}
return pemToString(pemkey)
}
}
func savePublicPKIXKey(pubkey rsa.PublicKey) (string, error) {
if asn1Bytes, err := x509.MarshalPKIXPublicKey(&pubkey); err != nil {
return "", err
} else {
var pemkey = &pem.Block{
Type: "PUBLIC KEY",
Bytes: asn1Bytes,
}
return pemToString(pemkey)
}
}
func pemToBytes(b *pem.Block) ([]byte, error) {
buffer := &bytes.Buffer{}
if err := pem.Encode(buffer, b); err != nil {
return nil, err
} else {
return buffer.Bytes(), nil
}
}
func pemToString(b *pem.Block) (string, error) {
buffer := &bytes.Buffer{}
if err := pem.Encode(buffer, b); err != nil {
return "", err
} else {
return string(buffer.Bytes()), nil
}
}