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sign.go
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sign.go
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package rsa
import (
"errors"
"crypto"
"crypto/rsa"
"crypto/rand"
)
// 私钥签名
func (this RSA) Sign() RSA {
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)
}
this.parsedData, err = rsa.SignPKCS1v15(rand.Reader, this.privateKey, this.signHash, hashed)
return this.AppendError(err)
}
// 公钥验证
// 使用原始数据[data]对比签名后数据
func (this RSA) Verify(data []byte) RSA {
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)
}
err = rsa.VerifyPKCS1v15(this.publicKey, this.signHash, hashed, this.data)
if err != nil {
return this.AppendError(err)
}
this.verify = true
return this
}
// 签名后数据
func (this RSA) dataHash(data []byte) ([]byte, error) {
if this.signHash == crypto.Hash(0) {
return nil, errors.New("signHash empty.")
}
h := this.signHash.New()
h.Write(data)
return h.Sum(nil), nil
}