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sign.go
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sign.go
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package crypto
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"io"
"math/big"
"strings"
"github.com/Laisky/errors/v2"
)
// // EncodeRSAPrivateKey encode rsa private key to pem bytes
// func EncodeRSAPrivateKey(privateKey *rsa.PrivateKey) ([]byte, error) {
// x509Encoded := x509.MarshalPKCS1PrivateKey(privateKey)
// return pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded}), nil
// }
// // EncodeRSAPublicKey encode rsa public key to pem bytes
// func EncodeRSAPublicKey(publicKey *rsa.PublicKey) ([]byte, error) {
// x509EncodedPub := x509.MarshalPKCS1PublicKey(publicKey)
// return pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: x509EncodedPub}), nil
// }
// // DecodeRSAPrivateKey decode rsa private key from pem bytes
// func DecodeRSAPrivateKey(pemEncoded []byte) (*rsa.PrivateKey, error) {
// block, _ := pem.Decode(pemEncoded)
// privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
// if err != nil {
// return nil, errors.Wrap(err, "parse rsa private key")
// }
// return privateKey, nil
// }
// // DecodeRSAPublicKey decode rsa public key from pem bytes
// func DecodeRSAPublicKey(pemEncodedPub []byte) (*rsa.PublicKey, error) {
// blockPub, _ := pem.Decode(pemEncodedPub)
// pubkey, err := x509.ParsePKCS1PublicKey(blockPub.Bytes)
// if err != nil {
// return nil, errors.Wrap(err, "parse rsa public key")
// }
// return pubkey, nil
// }
// SignByRSAWithSHA256 generate signature by rsa private key use sha256
func SignByRSAWithSHA256(priKey *rsa.PrivateKey, content []byte) ([]byte, error) {
hashed := sha256.Sum256(content)
return rsa.SignPKCS1v15(rand.Reader, priKey, crypto.SHA256, hashed[:])
}
// VerifyByRSAWithSHA256 verify signature by rsa public key use sha256
func VerifyByRSAWithSHA256(pubKey *rsa.PublicKey, content []byte, sig []byte) error {
hash := sha256.Sum256(content)
return rsa.VerifyPKCS1v15(pubKey, crypto.SHA256, hash[:], sig)
}
// SignReaderByRSAWithSHA256 generate signature by rsa private key use sha256
func SignReaderByRSAWithSHA256(priKey *rsa.PrivateKey, reader io.Reader) (sig []byte, err error) {
hasher := sha256.New()
if _, err = io.Copy(hasher, reader); err != nil {
return nil, errors.Wrap(err, "read content")
}
return rsa.SignPKCS1v15(rand.Reader, priKey, crypto.SHA256, hasher.Sum(nil))
}
// VerifyReaderByRSAWithSHA256 verify signature by rsa public key use sha256
func VerifyReaderByRSAWithSHA256(pubKey *rsa.PublicKey, reader io.Reader, sig []byte) error {
hasher := sha256.New()
if _, err := io.Copy(hasher, reader); err != nil {
return errors.Wrap(err, "read content")
}
return rsa.VerifyPKCS1v15(pubKey, crypto.SHA256, hasher.Sum(nil), sig)
}
// SignByECDSAWithSHA256 generate signature by ecdsa private key use sha256
func SignByECDSAWithSHA256(priKey *ecdsa.PrivateKey, content []byte) (r, s *big.Int, err error) {
hash := sha256.Sum256(content)
return ecdsa.Sign(rand.Reader, priKey, hash[:])
}
// VerifyByECDSAWithSHA256 verify signature by ecdsa public key use sha256
func VerifyByECDSAWithSHA256(pubKey *ecdsa.PublicKey, content []byte, r, s *big.Int) bool {
hash := sha256.Sum256(content)
return ecdsa.Verify(pubKey, hash[:], r, s)
}
// SignByECDSAWithSHA256AndBase64 generate signature by ecdsa private key use sha256
func SignByECDSAWithSHA256AndBase64(priKey *ecdsa.PrivateKey, content []byte) (signature string, err error) {
hash := sha256.Sum256(content)
r, s, err := ecdsa.Sign(rand.Reader, priKey, hash[:])
if err != nil {
return "", errors.Wrap(err, "sign")
}
return EncodeES256SignByBase64(r, s), nil
}
// VerifyByECDSAWithSHA256 verify signature by ecdsa public key use sha256
func VerifyByECDSAWithSHA256AndBase64(pubKey *ecdsa.PublicKey, content []byte, signature string) (bool, error) {
hash := sha256.Sum256(content)
r, s, err := DecodeES256SignByBase64(signature)
if err != nil {
return false, errors.Wrap(err, "decode signature")
}
return ecdsa.Verify(pubKey, hash[:], r, s), nil
}
// SignReaderByECDSAWithSHA256 generate signature by ecdsa private key use sha256
func SignReaderByECDSAWithSHA256(priKey *ecdsa.PrivateKey, reader io.Reader) (r, s *big.Int, err error) {
hasher := sha256.New()
if _, err = io.Copy(hasher, reader); err != nil {
return nil, nil, errors.Wrap(err, "read content")
}
return ecdsa.Sign(rand.Reader, priKey, hasher.Sum(nil))
}
// VerifyReaderByECDSAWithSHA256 verify signature by ecdsa public key use sha256
func VerifyReaderByECDSAWithSHA256(pubKey *ecdsa.PublicKey, reader io.Reader, r, s *big.Int) (bool, error) {
hasher := sha256.New()
if _, err := io.Copy(hasher, reader); err != nil {
return false, errors.Wrap(err, "read content")
}
return ecdsa.Verify(pubKey, hasher.Sum(nil), r, s), nil
}
const ecdsaSignDelimiter = "."
// EncodeES256SignByHex format ecdsa sign to stirng
func EncodeES256SignByHex(r, s *big.Int) string {
return FormatBig2Hex(r) + ecdsaSignDelimiter + FormatBig2Hex(s)
}
// DecodeES256SignByHex parse ecdsa signature string to two *big.Int
func DecodeES256SignByHex(sign string) (r, s *big.Int, err error) {
ss := strings.Split(sign, ecdsaSignDelimiter)
if len(ss) != 2 {
return nil, nil, errors.Errorf("unknown format of signature `%s`, want `xxx.xxx`", sign)
}
var ok bool
if r, ok = ParseHex2Big(ss[0]); !ok {
return nil, nil, errors.Errorf("invalidate hex `%s`", ss[0])
}
if s, ok = ParseHex2Big(ss[1]); !ok {
return nil, nil, errors.Errorf("invalidate hex `%s`", ss[1])
}
return
}
// EncodeES256SignByBase64 format ecdsa signature to stirng
func EncodeES256SignByBase64(r, s *big.Int) string {
return FormatBig2Base64(r) + ecdsaSignDelimiter + FormatBig2Base64(s)
}
// DecodeES256SignByBase64 parse ecdsa signature string to two *big.Int
func DecodeES256SignByBase64(sign string) (r, s *big.Int, err error) {
ss := strings.Split(sign, ecdsaSignDelimiter)
if len(ss) != 2 {
return nil, nil, errors.Wrapf(err, "unknown format of signature `%s`, expect is `xxxx.xxxx`", sign)
}
if r, err = ParseBase642Big(ss[0]); err != nil {
return nil, nil, errors.Wrapf(err, "`%s` is not validate base64", ss[0])
}
if s, err = ParseBase642Big(ss[1]); err != nil {
return nil, nil, errors.Wrapf(err, "`%s` is not validate base64", ss[1])
}
return
}