120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
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package rsax
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"os"
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)
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//生成RSA私钥和公钥，保存到文件中
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// 与下面命令等价
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// 生成私钥
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// openssl genrsa -out rsa_private_key.pem 1024
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// 生成公钥
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// openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
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// bits 证书大小 1024/2048
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func GenerateRSAKey(bits int) {
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//GenerateKey函数使用随机数据生成器random生成一对具有指定字位数的RSA密钥
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//Reader是一个全局、共享的密码用强随机数生成器
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privateKey, err := rsa.GenerateKey(rand.Reader, bits)
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if err != nil {
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panic(err)
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}
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//保存私钥
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//通过x509标准将得到的ras私钥序列化为ASN.1 的 DER编码字符串
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X509PrivateKey := x509.MarshalPKCS1PrivateKey(privateKey)
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//使用pem格式对x509输出的内容进行编码
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//创建文件保存私钥
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privateFile, err := os.Create("private.pem")
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if err != nil {
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panic(err)
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}
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defer privateFile.Close()
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//构建一个pem.Block结构体对象
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privateBlock := pem.Block{Type: "RSA Private Key", Bytes: X509PrivateKey}
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//将数据保存到文件
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pem.Encode(privateFile, &privateBlock)
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//保存公钥
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//获取公钥的数据
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publicKey := privateKey.PublicKey
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//X509对公钥编码
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X509PublicKey, err := x509.MarshalPKIXPublicKey(&publicKey)
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if err != nil {
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panic(err)
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}
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//pem格式编码
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//创建用于保存公钥的文件
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publicFile, err := os.Create("public.pem")
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if err != nil {
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panic(err)
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}
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defer publicFile.Close()
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//创建一个pem.Block结构体对象
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publicBlock := pem.Block{Type: "RSA Public Key", Bytes: X509PublicKey}
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//保存到文件
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pem.Encode(publicFile, &publicBlock)
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}
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// RSA加密
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// plainText 要加密的数据
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// path 公钥匙文件地址
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func RSA_Encrypt(plainText []byte, path string) []byte {
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//打开文件
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file, err := os.Open(path)
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if err != nil {
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panic(err)
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}
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defer file.Close()
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//读取文件的内容
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info, _ := file.Stat()
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buf := make([]byte, info.Size())
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file.Read(buf)
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//pem解码
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block, _ := pem.Decode(buf)
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//x509解码
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publicKeyInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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panic(err)
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}
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//类型断言
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publicKey := publicKeyInterface.(*rsa.PublicKey)
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//对明文进行加密
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cipherText, err := rsa.EncryptPKCS1v15(rand.Reader, publicKey, plainText)
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if err != nil {
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panic(err)
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}
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//返回密文
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return cipherText
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}
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//RSA解密
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// cipherText 需要解密的byte数据
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// path 私钥文件路径
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func RSA_Decrypt(cipherText []byte, path string) []byte {
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//打开文件
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file, err := os.Open(path)
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if err != nil {
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panic(err)
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}
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defer file.Close()
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//获取文件内容
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info, _ := file.Stat()
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buf := make([]byte, info.Size())
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file.Read(buf)
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//pem解码
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block, _ := pem.Decode(buf)
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//X509解码
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privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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panic(err)
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}
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//对密文进行解密
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plainText, _ := rsa.DecryptPKCS1v15(rand.Reader, privateKey, cipherText)
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//返回明文
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return plainText
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}
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