144 lines
3.5 KiB
Go
144 lines
3.5 KiB
Go
package rsa
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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/asn1"
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"encoding/pem"
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"fmt"
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"os"
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)
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func FileGet(path string) []byte {
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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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return buf
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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, buf []byte) []byte {
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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, buf []byte) []byte {
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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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private, err := x509.ParsePKCS8PrivateKey(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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v, err := rsa.DecryptPKCS1v15(rand.Reader, private.(*rsa.PrivateKey), cipherText)
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//返回明文
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return v
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}
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func MarshalPKCS8PrivateKey(key *rsa.PrivateKey) []byte {
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info := struct {
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Version int
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PrivateKeyAlgorithm []asn1.ObjectIdentifier
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PrivateKey []byte
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}{}
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info.Version = 0
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info.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
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info.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
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info.PrivateKey = x509.MarshalPKCS1PrivateKey(key)
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k, err := asn1.Marshal(info)
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if err != nil {
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panic(err.Error())
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}
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return k
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}
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func Demo() {
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//生成密钥对，保存到文件
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GenerateRSAKey(2048, "./")
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//加密
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data := []byte("hello world")
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encrypt := RSA_Encrypt(data, FileGet("public.pem"))
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fmt.Println(string(encrypt))
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// 解密
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decrypt := RSA_Decrypt(encrypt, FileGet("private.pem"))
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fmt.Println(string(decrypt))
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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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// bits 证书大小
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func GenerateRSAKey(bits int, path string) {
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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(path + "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(path + "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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