[TOC] ## rsa 的 加解密 1. 创建私钥： `openssl genrsa -out private.pem 1024` 密钥长度，1024觉得不够安全的话可以用2048，但是代价也相应增大 2. 创建公钥： `openssl rsa -in private.pem -pubout -out public.pem` 代码 ``` // 公钥和私钥可以从文件中读取 var privateKey = []byte(` -----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDZsfv1qscqYdy4vY+P4e3cAtmvppXQcRvrF1cB4drkv0haU24Y 7m5qYtT52Kr539RdbKKdLAM6s20lWy7+5C0DgacdwYWd/7PeCELyEipZJL07Vro7 Ate8Bfjya+wltGK9+XNUIHiumUKULW4KDx21+1NLAUeJ6PeW+DAkmJWF6QIDAQAB AoGBAJlNxenTQj6OfCl9FMR2jlMJjtMrtQT9InQEE7m3m7bLHeC+MCJOhmNVBjaM ZpthDORdxIZ6oCuOf6Z2+Dl35lntGFh5J7S34UP2BWzF1IyyQfySCNexGNHKT1G1 XKQtHmtc2gWWthEg+S6ciIyw2IGrrP2Rke81vYHExPrexf0hAkEA9Izb0MiYsMCB /jemLJB0Lb3Y/B8xjGjQFFBQT7bmwBVjvZWZVpnMnXi9sWGdgUpxsCuAIROXjZ40 IRZ2C9EouwJBAOPjPvV8Sgw4vaseOqlJvSq/C/pIFx6RVznDGlc8bRg7SgTPpjHG 4G+M3mVgpCX1a/EU1mB+fhiJ2LAZ/pTtY6sCQGaW9NwIWu3DRIVGCSMm0mYh/3X9 DAcwLSJoctiODQ1Fq9rreDE5QfpJnaJdJfsIJNtX1F+L3YceeBXtW0Ynz2MCQBI8 9KP274Is5FkWkUFNKnuKUK4WKOuEXEO+LpR+vIhs7k6WQ8nGDd4/mujoJBr5mkrw DPwqA3N5TMNDQVGv8gMCQQCaKGJgWYgvo3/milFfImbp+m7/Y3vCptarldXrYQWO AQjxwc71ZGBFDITYvdgJM1MTqc8xQek1FXn1vfpy2c6O -----END RSA PRIVATE KEY----- `) var publicKey = []byte(` -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDZsfv1qscqYdy4vY+P4e3cAtmv ppXQcRvrF1cB4drkv0haU24Y7m5qYtT52Kr539RdbKKdLAM6s20lWy7+5C0Dgacd wYWd/7PeCELyEipZJL07Vro7Ate8Bfjya+wltGK9+XNUIHiumUKULW4KDx21+1NL AUeJ6PeW+DAkmJWF6QIDAQAB -----END PUBLIC KEY----- `) // 加密 func RsaEncrypt(origData []byte) ([]byte, error) { block, _ := pem.Decode(publicKey) if block == nil { return nil, errors.New("public key error") } pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes) if err != nil { return nil, err } pub := pubInterface.(*rsa.PublicKey) return rsa.EncryptPKCS1v15(rand.Reader, pub, origData) } func RsaEncryptString(origData string) (string, error) { b, err := RsaEncrypt([]byte(origData)) if err != nil { return "", err } s := base64.StdEncoding.EncodeToString(b) return s, nil } // 解密 func RsaDecrypt(ciphertext []byte) ([]byte, error) { block, _ := pem.Decode(privateKey) if block == nil { return nil, errors.New("private key error!") } priv, err := x509.ParsePKCS1PrivateKey(block.Bytes) if err != nil { return nil, err } return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext) } func RsaDecryptString(s string) (string, error) { b, err := base64.StdEncoding.DecodeString(s) if err != nil { return "", err } decrypt, err := RsaDecrypt(b) if err != nil { return "", err } return string(decrypt), nil } func main() { data, err := RsaEncryptString("polaris@studygolang.com") if err != nil { panic(err) } origData, err := RsaDecryptString(data) if err != nil { panic(err) } fmt.Println(origData) } ```