/
tool.go
109 lines (96 loc) · 2.71 KB
/
tool.go
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package rsa_filter
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
)
var defaultPssOption = &rsa.PSSOptions{
SaltLength: 32,
Hash: crypto.SHA256,
}
func encrypt(data []byte, publicKey *rsa.PublicKey) ([]byte, error) {
blockSize := publicKey.Size() - 66
var encryptedChunks [][]byte
for len(data) > 0 {
chunkSize := len(data)
if chunkSize > blockSize {
chunkSize = blockSize
}
// 取出要加密的块
chunk := data[:chunkSize]
data = data[chunkSize:]
// 使用RSA公钥加密块
encryptedChunk, err := rsa.EncryptOAEP(sha256.New(), rand.Reader, publicKey, chunk, nil)
if err != nil {
return nil, err
}
encryptedChunks = append(encryptedChunks, encryptedChunk)
}
return bytes.Join(encryptedChunks, nil), nil
}
func decrypt(data []byte, privateKey *rsa.PrivateKey) ([]byte, error) {
blockSize := (privateKey.N.BitLen() + 7) / 8
var decryptedChunks [][]byte
for len(data) > 0 {
chunkSize := len(data)
if chunkSize > blockSize {
chunkSize = blockSize
}
// 取出要加密的块
chunk := data[:chunkSize]
data = data[chunkSize:]
// 使用RSA公钥加密块
encryptedChunk, err := rsa.DecryptOAEP(sha256.New(), rand.Reader, privateKey, chunk, nil)
if err != nil {
return nil, err
}
decryptedChunks = append(decryptedChunks, encryptedChunk)
}
return bytes.Join(decryptedChunks, nil), nil
}
func sign(data []byte, privateKey *rsa.PrivateKey) ([]byte, error) {
hashed := sha256.Sum256(data)
return rsa.SignPSS(rand.Reader, privateKey, crypto.SHA256, hashed[:], defaultPssOption)
}
func verify(data []byte, signature []byte, publicKey *rsa.PublicKey) error {
hashed := sha256.Sum256(data)
return rsa.VerifyPSS(publicKey, crypto.SHA256, hashed[:], signature, defaultPssOption)
}
func parsePrivateKey(data []byte) (*rsa.PrivateKey, error) {
block, _ := pem.Decode(data)
if block == nil {
return nil, errors.New("private key error")
}
privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parse private key err")
}
// 转换为 RSA 公钥
rsaPrivateKey, ok := privateKey.(*rsa.PrivateKey)
if !ok {
return nil, fmt.Errorf("private key is not an RSA public key")
}
return rsaPrivateKey, nil
}
func parsePublicKey(data []byte) (*rsa.PublicKey, error) {
block, _ := pem.Decode(data)
if block == nil {
return nil, errors.New("private key error")
}
publicKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parse private key err: %w", err)
}
// 转换为 RSA 公钥
rsaPublicKey, ok := publicKey.(*rsa.PublicKey)
if !ok {
return nil, fmt.Errorf("public key is not an RSA public key")
}
return rsaPublicKey, nil
}