package rsa

import (
	"crypto"

	"xdx.jelly/xgcl/rsa/internal"
	"xdx.jelly/xgcl/sm"
)

var VerifyPKCS1v15 = internal.VerifyPKCS1v15
var SignPKCS1v15 = internal.SignPKCS1v15

// helper function for RSA_SM3 signature

// SignPKCS1v15WithSm3 signature with SM3
func SignPKCS1v15WithSm3(priv *PrivateKey, hashed []byte) ([]byte, error) {
	return SignPKCS1v15(nil, priv, sm.SM3, hashed)
}

// SignPKCS1v15WithSm3 signature with SHA256
func SignPKCS1v15WithSha256(priv *PrivateKey, hashed []byte) ([]byte, error) {
	return SignPKCS1v15(nil, priv, sm.SHA256, hashed)
}

// VerifyPKCS1v15WithSm3 verify with SM3
func VerifyPKCS1v15WithSm3(pub *PublicKey, hashed []byte, sig []byte) error {
	return VerifyPKCS1v15(pub, sm.SM3, hashed, sig)
}

// VerifyPKCS1v15WithSha256 verify with SHA256
func VerifyPKCS1v15WithSha256(pub *PublicKey, hashed []byte, sig []byte) error {
	return VerifyPKCS1v15(pub, sm.SHA256, hashed, sig)
}

// PKCS1v15 implement the sdf.RSAAdapter interface
type PKCS1v15 struct{}

// 0018用的是PKCS1v1.5 还有其他暂不实现
func NewPKCS1v15() PKCS1v15 {
	return PKCS1v15{}
}

func (PKCS1v15) Sign(priv *PrivateKey, hash crypto.Hash, hashed []byte) ([]byte, error) {
	return internal.SignPKCS1v15(nil, priv, sm.Hash{Hash: hash}, hashed)
}

func (PKCS1v15) Verify(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte) error {
	return internal.VerifyPKCS1v15(pub, sm.Hash{Hash: hash}, hashed, sig)
}