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sign.go
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sign.go
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package gost
import (
"errors"
"crypto/rand"
"github.com/deatil/go-cryptobin/gost"
)
// 私钥签名
func (this Gost) Sign() Gost {
if this.privateKey == nil {
err := errors.New("privateKey empty.")
return this.AppendError(err)
}
hashed, err := this.dataHash(this.data)
if err != nil {
return this.AppendError(err)
}
parsedData, err := gost.Sign(rand.Reader, this.privateKey, hashed)
if err != nil {
return this.AppendError(err)
}
this.parsedData = parsedData
return this
}
// 公钥验证
// 使用原始数据[data]对比签名后数据
func (this Gost) Verify(data []byte) Gost {
if this.publicKey == nil {
err := errors.New("publicKey empty.")
return this.AppendError(err)
}
hashed, err := this.dataHash(data)
if err != nil {
return this.AppendError(err)
}
this.verify, err = gost.Verify(this.publicKey, hashed, this.data)
return this.AppendError(err)
}
// ===============
// 私钥签名
func (this Gost) SignASN1() Gost {
if this.privateKey == nil {
err := errors.New("privateKey empty.")
return this.AppendError(err)
}
hashed, err := this.dataHash(this.data)
if err != nil {
return this.AppendError(err)
}
parsedData, err := gost.SignASN1(rand.Reader, this.privateKey, hashed)
if err != nil {
return this.AppendError(err)
}
this.parsedData = parsedData
return this
}
// 公钥验证
// 使用原始数据[data]对比签名后数据
func (this Gost) VerifyASN1(data []byte) Gost {
if this.publicKey == nil {
err := errors.New("publicKey empty.")
return this.AppendError(err)
}
hashed, err := this.dataHash(data)
if err != nil {
return this.AppendError(err)
}
this.verify, err = gost.VerifyASN1(this.publicKey, hashed, this.data)
return this.AppendError(err)
}
// ===============
// 签名后数据
func (this Gost) dataHash(data []byte) ([]byte, error) {
if this.signHash == nil {
return nil, errors.New("hash func empty.")
}
h := this.signHash()
h.Write(data)
return h.Sum(nil), nil
}