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kdf_mac.go
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kdf_mac.go
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package pkcs12
import (
"hash"
"errors"
"crypto/rand"
"crypto/hmac"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"crypto/x509/pkix"
"encoding/asn1"
"golang.org/x/crypto/md4"
"github.com/tjfoc/gmsm/sm3"
cryptobin_md2 "github.com/deatil/go-cryptobin/hash/md2"
cryptobin_pbkdf "github.com/deatil/go-cryptobin/kdf/pbkdf"
)
// 可使用的 hash 方式
type Hash uint
const (
MD2 Hash = 1 + iota
MD4
MD5
SHA1
SHA224
SHA256
SHA384
SHA512
SHA512_224
SHA512_256
SM3
)
var (
// 默认 hash
DefaultHash = SHA1
)
var (
oidMD2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 2}
oidMD4 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 4}
oidMD5 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 5}
oidSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26}
oidSHA224 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 4}
oidSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1}
oidSHA384 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 2}
oidSHA512 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 3}
oidSHA512_224 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 5}
oidSHA512_256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 6}
oidSM3 = asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 401}
)
// 返回使用的 Hash 方式
func hashByOID(oid asn1.ObjectIdentifier) (func() hash.Hash, error) {
switch {
case oid.Equal(oidMD2):
return cryptobin_md2.New, nil
case oid.Equal(oidMD4):
return md4.New, nil
case oid.Equal(oidMD5):
return md5.New, nil
case oid.Equal(oidSHA1):
return sha1.New, nil
case oid.Equal(oidSHA224):
return sha256.New224, nil
case oid.Equal(oidSHA256):
return sha256.New, nil
case oid.Equal(oidSHA384):
return sha512.New384, nil
case oid.Equal(oidSHA512):
return sha512.New, nil
case oid.Equal(oidSHA512_224):
return sha512.New512_224, nil
case oid.Equal(oidSHA512_256):
return sha512.New512_256, nil
case oid.Equal(oidSM3):
return sm3.New, nil
}
return nil, errors.New("pkcs12: unsupported hash function")
}
// 返回使用的 Hash 对应的 asn1
func oidByHash(h Hash) (asn1.ObjectIdentifier, error) {
switch h {
case MD2:
return oidMD2, nil
case MD4:
return oidMD4, nil
case MD5:
return oidMD5, nil
case SHA1:
return oidSHA1, nil
case SHA224:
return oidSHA224, nil
case SHA256:
return oidSHA256, nil
case SHA384:
return oidSHA384, nil
case SHA512:
return oidSHA512, nil
case SHA512_224:
return oidSHA512_224, nil
case SHA512_256:
return oidSHA512_256, nil
case SM3:
return oidSM3, nil
}
return nil, errors.New("pkcs12: unsupported hash function")
}
// from PKCS#7:
type DigestInfo struct {
Algorithm pkix.AlgorithmIdentifier
Digest []byte
}
type MacData struct {
Mac DigestInfo
MacSalt []byte
Iterations int `asn1:"optional,default:1"`
}
func (this MacData) Verify(message []byte, password []byte) (err error) {
var alg asn1.ObjectIdentifier
var h func() hash.Hash
if this.Mac.Algorithm.Algorithm.String() != "" {
h, err = hashByOID(this.Mac.Algorithm.Algorithm)
if err != nil {
return err
}
} else {
alg, err = oidByHash(DefaultHash)
if err != nil {
return err
}
h, err = hashByOID(alg)
if err != nil {
return err
}
}
hashSize := h().Size()
key := cryptobin_pbkdf.Key(h, hashSize, 64, this.MacSalt, password, this.Iterations, 3, hashSize)
mac := hmac.New(h, key)
mac.Write(message)
expectedMAC := mac.Sum(nil)
if !hmac.Equal(this.Mac.Digest, expectedMAC) {
return ErrIncorrectPassword
}
return
}
// mac 配置
type MacOpts struct {
SaltSize int // 8
IterationCount int // 1
HMACHash Hash
}
func (this MacOpts) Compute(message []byte, password []byte) (data MacKDFParameters, err error) {
var alg asn1.ObjectIdentifier
var prfParam pkix.AlgorithmIdentifier
if this.HMACHash != 0 {
alg, err = oidByHash(this.HMACHash)
} else {
alg, err = oidByHash(DefaultHash)
}
if err != nil {
return nil, err
}
prfParam = pkix.AlgorithmIdentifier{
Algorithm: alg,
Parameters: asn1.RawValue{
Tag: asn1.TagNull,
},
}
h, err := hashByOID(alg)
if err != nil {
return nil, err
}
macSalt := make([]byte, this.SaltSize)
if _, err = rand.Read(macSalt); err != nil {
return nil, err
}
hashSize := h().Size()
key := cryptobin_pbkdf.Key(h, hashSize, 64, macSalt, password, this.IterationCount, 3, hashSize)
mac := hmac.New(h, key)
mac.Write(message)
digest := mac.Sum(nil)
data = MacData{
DigestInfo{
prfParam,
digest,
},
macSalt,
this.IterationCount,
}
return
}