330 lines
9.1 KiB
Go
330 lines
9.1 KiB
Go
package util
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/elliptic"
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"crypto/hmac"
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"crypto/md5"
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"crypto/rand"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"crypto/x509/pkix"
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"encoding/asn1"
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"fmt"
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"hash"
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"math/big"
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"reflect"
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"voucher/internal/pkg/cmb/sm2/model"
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)
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/*
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* reference to RFC5959 and RFC2898
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*/
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var (
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oidPBES2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 13} // id-PBES2(PBES2)
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oidPBKDF2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 12} // id-PBKDF2
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oidAES128CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 2}
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oidAES256CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 42}
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oidKEYMD5 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 5}
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oidKEYSHA1 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 7}
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oidKEYSHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 9}
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oidKEYSHA512 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 11}
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oidSM2 = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
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)
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type Sm2PrivateKey struct {
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Version int
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PrivateKey []byte
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NamedCurveOID asn1.ObjectIdentifier `asn1:"optional,explicit,tag:0"`
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PublicKey asn1.BitString `asn1:"optional,explicit,tag:1"`
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}
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type pkcs8 struct {
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Version int
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Algo pkix.AlgorithmIdentifier
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PrivateKey []byte
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}
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// EncryptedPrivateKeyInfo reference to https://www.rfc-editor.org/rfc/rfc5958.txt
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type EncryptedPrivateKeyInfo struct {
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EncryptionAlgorithm Pbes2Algorithms
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EncryptedData []byte
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}
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// Pbes2Algorithms reference to https://www.ietf.org/rfc/rfc2898.txt
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type Pbes2Algorithms struct {
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IdPBES2 asn1.ObjectIdentifier
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Pbes2Params Pbes2Params
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}
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// Pbes2Params reference to https://www.ietf.org/rfc/rfc2898.txt
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type Pbes2Params struct {
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KeyDerivationFunc Pbes2KDfs // PBES2-KDFs
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EncryptionScheme Pbes2Encs // PBES2-Encs
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}
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// Pbes2KDfs reference to https://www.ietf.org/rfc/rfc2898.txt
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type Pbes2KDfs struct {
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IdPBKDF2 asn1.ObjectIdentifier
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Pkdf2Params Pkdf2Params
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}
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type Pbes2Encs struct {
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EncryAlgo asn1.ObjectIdentifier
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IV []byte
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}
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// Pkdf2Params reference to https://www.ietf.org/rfc/rfc2898.txt
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type Pkdf2Params struct {
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Salt []byte
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IterationCount int
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Prf pkix.AlgorithmIdentifier
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}
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func ParsePrivateKey(bytes []byte, pwd []byte) (*model.PrivateKey, error) {
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var priKey Sm2PrivateKey
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var err error
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if pwd == nil {
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priKey, err = ParsePKCS8UnEncryptedPrivateKey(bytes)
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} else {
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priKey, err = ParsePKCS8EncryptedPrivateKey(bytes, pwd)
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}
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if err != nil {
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return nil, fmt.Errorf("parse private key err: %s", err.Error())
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}
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curve := NewP256Sm2()
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k := new(big.Int).SetBytes(priKey.PrivateKey)
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curveOrder := curve.Params().N
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if k.Cmp(curveOrder) >= 0 {
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return nil, fmt.Errorf("invalid elliptic curve private key value")
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}
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privateKey := make([]byte, (curveOrder.BitLen()+7)/8)
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for len(priKey.PrivateKey) > len(privateKey) {
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if priKey.PrivateKey[0] != 0 {
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return nil, fmt.Errorf("invalid private key")
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}
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priKey.PrivateKey = priKey.PrivateKey[1:]
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}
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copy(privateKey[len(privateKey)-len(priKey.PrivateKey):], priKey.PrivateKey)
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x, y := curve.ScalarBaseMult(privateKey)
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return &model.PrivateKey{
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PublicKey: &model.PublicKey{
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Curve: curve,
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X: x,
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Y: y,
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},
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D: k,
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}, nil
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}
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func ParsePKCS8UnEncryptedPrivateKey(bytes []byte) (Sm2PrivateKey, error) {
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var pk pkcs8
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var priKey Sm2PrivateKey
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if _, err := asn1.Unmarshal(bytes, &pk); err != nil {
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return priKey, err
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}
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if !reflect.DeepEqual(pk.Algo.Algorithm, oidSM2) {
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return priKey, fmt.Errorf("not sm2 elliptic curve")
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}
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if _, err := asn1.Unmarshal(pk.PrivateKey, &priKey); err != nil {
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return priKey, fmt.Errorf("privateKey is not sm2 private key: %s", err.Error())
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}
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return priKey, nil
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}
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func ParsePKCS8EncryptedPrivateKey(bytes, pwd []byte) (Sm2PrivateKey, error) {
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var keyInfo EncryptedPrivateKeyInfo
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var priKey Sm2PrivateKey
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_, err := asn1.Unmarshal(bytes, &keyInfo)
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if err != nil {
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return priKey, fmt.Errorf("privateKey is not sm2 encrypted private key: %s", err.Error())
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}
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if !reflect.DeepEqual(keyInfo.EncryptionAlgorithm.IdPBES2, oidPBES2) {
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return priKey, fmt.Errorf("x509: only support PBES2")
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}
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encryptionScheme := keyInfo.EncryptionAlgorithm.Pbes2Params.EncryptionScheme
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keyDerivationFunc := keyInfo.EncryptionAlgorithm.Pbes2Params.KeyDerivationFunc
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if !reflect.DeepEqual(keyDerivationFunc.IdPBKDF2, oidPBKDF2) {
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return priKey, fmt.Errorf("x509: only support PBKDF2")
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}
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pkdf2Params := keyDerivationFunc.Pkdf2Params
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if !reflect.DeepEqual(encryptionScheme.EncryAlgo, oidAES128CBC) &&
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!reflect.DeepEqual(encryptionScheme.EncryAlgo, oidAES256CBC) {
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return priKey, fmt.Errorf("x509: only support AES")
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}
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iv := encryptionScheme.IV
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salt := pkdf2Params.Salt
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iter := pkdf2Params.IterationCount
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encryptedKey := keyInfo.EncryptedData
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var key []byte
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switch {
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case pkdf2Params.Prf.Algorithm.Equal(oidKEYMD5):
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key = pbkdf(pwd, salt, iter, 32, md5.New)
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break
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case pkdf2Params.Prf.Algorithm.Equal(oidKEYSHA1):
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key = pbkdf(pwd, salt, iter, 32, sha1.New)
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break
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case pkdf2Params.Prf.Algorithm.Equal(oidKEYSHA256):
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key = pbkdf(pwd, salt, iter, 32, sha256.New)
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break
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case pkdf2Params.Prf.Algorithm.Equal(oidKEYSHA512):
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key = pbkdf(pwd, salt, iter, 32, sha512.New)
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break
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default:
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return priKey, fmt.Errorf("x509: unknown hash algorithm")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return priKey, err
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(encryptedKey, encryptedKey)
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return ParsePKCS8UnEncryptedPrivateKey(encryptedKey)
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}
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// copy from crypto/pbkdf2.go
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func pbkdf(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
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prf := hmac.New(h, password)
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hashLen := prf.Size()
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numBlocks := (keyLen + hashLen - 1) / hashLen
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var buf [4]byte
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dk := make([]byte, 0, numBlocks*hashLen)
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U := make([]byte, hashLen)
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for block := 1; block <= numBlocks; block++ {
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// N.B.: || means concatenation, ^ means XOR
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// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
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// U_1 = PRF(password, salt || uint(i))
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prf.Reset()
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prf.Write(salt)
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buf[0] = byte(block >> 24)
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buf[1] = byte(block >> 16)
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buf[2] = byte(block >> 8)
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buf[3] = byte(block)
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prf.Write(buf[:4])
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dk = prf.Sum(dk)
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T := dk[len(dk)-hashLen:]
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copy(U, T)
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// U_n = PRF(password, U_(n-1))
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for n := 2; n <= iter; n++ {
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prf.Reset()
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prf.Write(U)
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U = U[:0]
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U = prf.Sum(U)
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for x := range U {
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T[x] ^= U[x]
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}
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}
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}
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return dk[:keyLen]
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}
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func MarshalSm2PrivateKey(key *model.PrivateKey, pwd []byte) ([]byte, error) {
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if pwd == nil {
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return MarshalSm2UnEncryptedPrivateKey(key)
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}
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return MarshalSm2EncryptedPrivateKey(key, pwd)
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}
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func MarshalSm2EncryptedPrivateKey(priKey *model.PrivateKey, pwd []byte) ([]byte, error) {
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der, err := MarshalSm2UnEncryptedPrivateKey(priKey)
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if err != nil {
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return nil, err
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}
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iter := 2048
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salt := make([]byte, 8)
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iv := make([]byte, 16)
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rand.Reader.Read(salt)
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rand.Reader.Read(iv)
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key := pbkdf(pwd, salt, iter, 32, sha1.New) // 默认是SHA1
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padding := aes.BlockSize - len(der)%aes.BlockSize
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if padding > 0 {
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n := len(der)
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der = append(der, make([]byte, padding)...)
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for i := 0; i < padding; i++ {
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der[n+i] = byte(padding)
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}
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}
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encryptedKey := make([]byte, len(der))
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(encryptedKey, der)
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var algorithmIdentifier pkix.AlgorithmIdentifier
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algorithmIdentifier.Algorithm = oidKEYSHA1
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algorithmIdentifier.Parameters.Tag = 5
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algorithmIdentifier.Parameters.IsCompound = false
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algorithmIdentifier.Parameters.FullBytes = []byte{5, 0}
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keyDerivationFunc := Pbes2KDfs{
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oidPBKDF2,
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Pkdf2Params{
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salt,
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iter,
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algorithmIdentifier,
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},
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}
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encryptionScheme := Pbes2Encs{
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oidAES256CBC,
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iv,
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}
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pbes2Algorithms := Pbes2Algorithms{
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oidPBES2,
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Pbes2Params{
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keyDerivationFunc,
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encryptionScheme,
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},
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}
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encryptedPkey := EncryptedPrivateKeyInfo{
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pbes2Algorithms,
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encryptedKey,
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}
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return asn1.Marshal(encryptedPkey)
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}
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func MarshalSm2UnEncryptedPrivateKey(key *model.PrivateKey) ([]byte, error) {
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var r pkcs8
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var pri Sm2PrivateKey
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var algo pkix.AlgorithmIdentifier
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algo.Algorithm = oidSM2
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algo.Parameters.Class = 0
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algo.Parameters.Tag = 6
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algo.Parameters.IsCompound = false
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algo.Parameters.FullBytes = []byte{6, 8, 42, 129, 28, 207, 85, 1, 130, 45} // asn1.Marshal(asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 301})
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pri.Version = 1
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pri.NamedCurveOID = oidNamedCurveP256SM2
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pri.PublicKey = asn1.BitString{Bytes: elliptic.Marshal(key.Curve, key.X, key.Y)}
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pri.PrivateKey = key.D.Bytes()
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r.Version = 0
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r.Algo = algo
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r.PrivateKey, _ = asn1.Marshal(pri)
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return asn1.Marshal(r)
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}
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func MarshalSm2PublicKey(key *model.PublicKey) ([]byte, error) {
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var r PKIXPublicKey
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var algo pkix.AlgorithmIdentifier
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if key.Curve.Params() != NewP256Sm2().Params() {
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return nil, fmt.Errorf("x509: unsupported elliptic curve")
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}
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algo.Algorithm = oidSM2
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algo.Parameters.Class = 0
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algo.Parameters.Tag = 6
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algo.Parameters.IsCompound = false
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algo.Parameters.FullBytes = []byte{6, 8, 42, 129, 28, 207, 85, 1, 130, 45} // asn1.Marshal(asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 301})
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r.Algo = algo
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r.BitString = asn1.BitString{Bytes: elliptic.Marshal(key.Curve, key.X, key.Y)}
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return asn1.Marshal(r)
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}
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