/
signer_dsa.go
91 lines (71 loc) · 1.85 KB
/
signer_dsa.go
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package pkcs7
import (
"errors"
"math/big"
"crypto"
"crypto/dsa"
"crypto/rand"
"encoding/asn1"
)
type dsaSignature struct {
R, S *big.Int
}
// rsa 签名
type KeySignWithDSA struct {
hashFunc crypto.Hash
hashId asn1.ObjectIdentifier
identifier asn1.ObjectIdentifier
}
// oid
func (this KeySignWithDSA) HashOID() asn1.ObjectIdentifier {
return this.hashId
}
// oid
func (this KeySignWithDSA) OID() asn1.ObjectIdentifier {
return this.identifier
}
// 签名
func (this KeySignWithDSA) Sign(pkey crypto.PrivateKey, data []byte) ([]byte, []byte, error) {
var priv *dsa.PrivateKey
var ok bool
if priv, ok = pkey.(*dsa.PrivateKey); !ok {
return nil, nil, errors.New("pkcs7: PrivateKey is not dsa PrivateKey")
}
hashData := hashSignData(this.hashFunc, data)
r, s, err := dsa.Sign(rand.Reader, priv, hashData)
if err != nil {
return nil, nil, err
}
signData, err := asn1.Marshal(dsaSignature{r, s})
if err != nil {
return nil, nil, err
}
return hashData, signData, nil
}
// 验证
func (this KeySignWithDSA) Verify(pkey crypto.PublicKey, signed []byte, signature []byte) (bool, error) {
var pub *dsa.PublicKey
var ok bool
if pub, ok = pkey.(*dsa.PublicKey); !ok {
return false, errors.New("pkcs7: PublicKey is not dsa PublicKey")
}
var dsaSign dsaSignature
_, err := asn1.Unmarshal(signature, &dsaSign)
if err != nil {
return false, err
}
r := dsaSign.R
s := dsaSign.S
hashData := hashSignData(this.hashFunc, signed)
return dsa.Verify(pub, hashData, r, s), nil
}
// 检测证书
func (this KeySignWithDSA) Check(pkey any) bool {
if _, ok := pkey.(*dsa.PrivateKey); ok {
return true
}
if _, ok := pkey.(*dsa.PublicKey); ok {
return true
}
return false
}