/
signer.go
56 lines (45 loc) · 993 Bytes
/
signer.go
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package rsa
import (
"crypto/rand"
"crypto/rsa"
)
type Signer struct {
err error
opts *signerOptions
privateKey *rsa.PrivateKey
}
var DefaultSigner = NewSigner()
func NewSigner(opts ...SignerOption) *Signer {
o := defaultSignerOptions()
for _, opt := range opts {
opt(o)
}
d := &Signer{opts: o}
d.privateKey, d.err = parsePrivateKey(d.opts.privateKey)
return d
}
// Name 名称
func (s *Signer) Name() string {
return Name
}
// Sign 签名
func (s *Signer) Sign(data []byte) ([]byte, error) {
if s.err != nil {
return nil, s.err
}
hash := s.opts.hash.Hash()
hashed := s.opts.hash.Sum(data)
switch s.opts.padding {
case PKCS:
return rsa.SignPKCS1v15(rand.Reader, s.privateKey, hash, hashed)
default:
return rsa.SignPSS(rand.Reader, s.privateKey, hash, hashed, &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthEqualsHash,
Hash: hash,
})
}
}
// Sign 签名
func Sign(data []byte) ([]byte, error) {
return DefaultSigner.Sign(data)
}