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sign.go
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sign.go
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package eddsa
import (
"errors"
"crypto"
"crypto/rand"
"crypto/ed25519"
)
// 私钥签名
func (this EdDSA) Sign() EdDSA {
if this.privateKey == nil {
err := errors.New("privateKey empty.")
return this.AppendError(err)
}
hashed := this.dataHash(this.data)
sig, err := this.privateKey.Sign(rand.Reader, hashed, this.options)
if err != nil {
return this.AppendError(err)
}
this.parsedData = sig
return this
}
// 公钥验证
func (this EdDSA) Verify(data []byte) EdDSA {
if this.publicKey == nil {
err := errors.New("publicKey empty.")
return this.AppendError(err)
}
hashed := this.dataHash(data)
err := ed25519.VerifyWithOptions(this.publicKey, hashed, this.data, this.options)
if err != nil {
return this.AppendError(err)
}
this.verify = true
return this
}
// 判断是否需要 hash 处理
func (this EdDSA) dataHash(data []byte) []byte {
hash := this.options.HashFunc()
if hash == crypto.SHA512 {
h := hash.New()
h.Write(data)
return h.Sum(nil)
}
return data
}