/
rsacrypt.go
179 lines (159 loc) · 3.57 KB
/
rsacrypt.go
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package xginx
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
)
const (
//RSABits 默认rsa加密强度
RSABits = 2048
)
//RSAPublicKey rsa公钥
type RSAPublicKey struct {
pp *rsa.PublicKey
}
//LoadRSAPublicKey 加载一个公钥
func LoadRSAPublicKey(str string) (*RSAPublicKey, error) {
pp := &RSAPublicKey{}
err := pp.Load(str)
return pp, err
}
//Load 加载公钥
func (ptr *RSAPublicKey) Load(str string) error {
bb, err := HashLoad(str)
if err != nil {
return err
}
pp, err := x509.ParsePKCS1PublicKey(bb)
if err != nil {
return err
}
ptr.pp = pp
return nil
}
//Verify 公钥验签
func (ptr RSAPublicKey) Verify(src []byte, sign []byte) error {
h := sha256.New()
h.Write(src)
hashed := h.Sum(nil)
return rsa.VerifyPKCS1v15(ptr.pp, crypto.SHA256, hashed, sign)
}
func bytesSplit(buf []byte, lim int) [][]byte {
var chunk []byte
chunks := make([][]byte, 0, len(buf)/lim+1)
for len(buf) >= lim {
chunk, buf = buf[:lim], buf[lim:]
chunks = append(chunks, chunk)
}
if len(buf) > 0 {
chunks = append(chunks, buf[:len(buf)])
}
return chunks
}
//Encrypt 公钥加密
func (ptr RSAPublicKey) Encrypt(bb []byte) ([]byte, error) {
w := NewWriter()
bbs := bytesSplit(bb, ptr.pp.Size()-11)
for _, v := range bbs {
bv, err := rsa.EncryptPKCS1v15(rand.Reader, ptr.pp, v)
if err != nil {
return nil, err
}
err = w.WriteFull(bv)
if err != nil {
return nil, err
}
}
return w.Bytes(), nil
}
func (ptr RSAPublicKey) MustID() string {
id, err := ptr.ID()
if err != nil {
panic(err)
}
return id
}
func (ptr RSAPublicKey) ID() (string, error) {
bb := x509.MarshalPKCS1PublicKey(ptr.pp)
return EncodeAddressWithPrefix("rsa", Hash160From(bb))
}
//Dump 导出公钥
func (ptr RSAPublicKey) Dump() (string, error) {
bb := x509.MarshalPKCS1PublicKey(ptr.pp)
return HashDump(bb)
}
//RSAPrivateKey rsa私钥
type RSAPrivateKey struct {
pk *rsa.PrivateKey
}
//LoadRSAPrivateKey 加载一个私钥
func LoadRSAPrivateKey(str string, pass ...string) (*RSAPrivateKey, error) {
pk := &RSAPrivateKey{}
err := pk.Load(str, pass...)
return pk, err
}
//Load 加载rsa私钥
func (ptr *RSAPrivateKey) Load(str string, pass ...string) error {
bb, err := HashLoad(str, pass...)
if err != nil {
return err
}
pk, err := x509.ParsePKCS1PrivateKey([]byte(bb))
if err != nil {
return err
}
err = pk.Validate()
if err != nil {
return err
}
ptr.pk = pk
return nil
}
//Sign 私钥签名
func (ptr RSAPrivateKey) Sign(src []byte) ([]byte, error) {
h := sha256.New()
h.Write(src)
hashed := h.Sum(nil)
return rsa.SignPKCS1v15(rand.Reader, ptr.pk, crypto.SHA256, hashed)
}
//Decrypt 私钥解密
func (ptr RSAPrivateKey) Decrypt(bb []byte) ([]byte, error) {
w := NewWriter()
bbs := bytesSplit(bb, ptr.pk.Size())
for _, v := range bbs {
bv, err := rsa.DecryptPKCS1v15(rand.Reader, ptr.pk, v)
if err != nil {
return nil, err
}
err = w.WriteFull(bv)
if err != nil {
return nil, err
}
}
return w.Bytes(), nil
}
//PublicKey 获取对应的公钥
func (ptr RSAPrivateKey) PublicKey() *RSAPublicKey {
return &RSAPublicKey{pp: &ptr.pk.PublicKey}
}
//ID 获取RSA ID
func (ptr RSAPrivateKey) ID() (string, error) {
return ptr.PublicKey().ID()
}
//Dump 导出密钥
func (ptr RSAPrivateKey) Dump(pass ...string) (string, error) {
bb := x509.MarshalPKCS1PrivateKey(ptr.pk)
return HashDump(bb, pass...)
}
//NewRSAPrivateKey 创建一个rsa密钥对
func NewRSAPrivateKey() (*RSAPrivateKey, error) {
ret := &RSAPrivateKey{}
pk, err := rsa.GenerateKey(rand.Reader, RSABits)
if err != nil {
return nil, err
}
ret.pk = pk
return ret, nil
}