【go语言】RSA加解密

时间：2021-11-19 20:29:00

关于go语言的RSA加解密的介绍，这里有一篇文章，已经介绍的很完整了。

对应的go语言的加解密代码，参考git。

因为原文跨语言是跟php，我这里要跟c语言进行交互，所以，这里贴上c语言的例子。

参考原文：http://hayageek.com/rsa-encryption-decryption-openssl-c/

#include <openssl/pem.h>

#include <openssl/ssl.h>

#include <openssl/rsa.h>

#include <openssl/evp.h>

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/buffer.h>

#include <stdio.h>

#include <stdint.h>

//编译

//gcc rsa_example.c -o example -L/usr/local/Cellar/openssl/1.0.2e/lib/ -lssl -lcrypto

//openssl的base64编解码: https://gist.github.com/barrysteyn/7308212

int Base64Encode(const unsigned char* buffer, size_t length, char** b64text) {

    BIO *bio, *b64;

    BUF_MEM *bufferPtr;

    b64 = BIO_new(BIO_f_base64());

    bio = BIO_new(BIO_s_mem());

    bio = BIO_push(b64, bio);

    BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);

    BIO_write(bio, buffer, length);

    BIO_flush(bio);

    BIO_get_mem_ptr(bio, &bufferPtr);

    BIO_set_close(bio, BIO_NOCLOSE);

    BIO_free_all(bio);

    *b64text=(*bufferPtr).data;

    return (); //success

}

int padding = RSA_PKCS1_PADDING;

RSA * createRSA(unsigned char * key,int public)

{

    RSA *rsa= NULL;

    BIO *keybio ;

    keybio = BIO_new_mem_buf(key, -);

    if (keybio==NULL)

    {

        printf( "Failed to create key BIO");

        return ;

    }

    if(public)

    {

        rsa = PEM_read_bio_RSA_PUBKEY(keybio, &rsa,NULL, NULL);

    }

    else

    {

        rsa = PEM_read_bio_RSAPrivateKey(keybio, &rsa,NULL, NULL);

    }

    if(rsa == NULL)

    {

        printf( "Failed to create RSA");

    }

    return rsa;

}

int public_encrypt(unsigned char * data,int data_len,unsigned char * key, unsigned char *encrypted)

{

    RSA * rsa = createRSA(key,);

    int result = RSA_public_encrypt(data_len,data,encrypted,rsa,padding);

    return result;

}

int private_decrypt(unsigned char * enc_data,int data_len,unsigned char * key, unsigned char *decrypted)

{

    RSA * rsa = createRSA(key,);

    int  result = RSA_private_decrypt(data_len,enc_data,decrypted,rsa,padding);

    return result;

}

int private_encrypt(unsigned char * data,int data_len,unsigned char * key, unsigned char *encrypted)

{

    RSA * rsa = createRSA(key,);

    int result = RSA_private_encrypt(data_len,data,encrypted,rsa,padding);

    return result;

}

int public_decrypt(unsigned char * enc_data,int data_len,unsigned char * key, unsigned char *decrypted)

{

    RSA * rsa = createRSA(key,);

    int  result = RSA_public_decrypt(data_len,enc_data,decrypted,rsa,padding);

    return result;

}

void printLastError(char *msg)

{

    char * err = malloc();;

    ERR_load_crypto_strings();

    ERR_error_string(ERR_get_error(), err);

    printf("%s ERROR: %s\n",msg, err);

    free(err);

}

int main(){

 char plainText[/] = ""; //原始数据为字符串1024；key length : 2048, 数据最长为 keylen/8个char

 char publicKey[]="-----BEGIN PUBLIC KEY-----\n"\

"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAy8Dbv8prpJ/0kKhlGeJY\n"\

"ozo2t60EG8L0561g13R29LvMR5hyvGZlGJpmn65+A4xHXInJYiPuKzrKUnApeLZ+\n"\

"vw1HocOAZtWK0z3r26uA8kQYOKX9Qt/DbCdvsF9wF8gRK0ptx9M6R13NvBxvVQAp\n"\

"fc9jB9nTzphOgM4JiEYvlV8FLhg9yZovMYd6Wwf3aoXK891VQxTr/kQYoq1Yp+68\n"\

"i6T4nNq7NWC+UNVjQHxNQMQMzU6lWCX8zyg3yH88OAQkUXIXKfQ+NkvYQ1cxaMoV\n"\

"PpY72+eVthKzpMeyHkBn7ciumk5qgLTEJAfWZpe4f4eFZj/Rc8Y8Jj2IS5kVPjUy\n"\

"wQIDAQAB\n"\

"-----END PUBLIC KEY-----\n";

 char privateKey[]="-----BEGIN RSA PRIVATE KEY-----\n"\

"MIIEowIBAAKCAQEAy8Dbv8prpJ/0kKhlGeJYozo2t60EG8L0561g13R29LvMR5hy\n"\

"vGZlGJpmn65+A4xHXInJYiPuKzrKUnApeLZ+vw1HocOAZtWK0z3r26uA8kQYOKX9\n"\

"Qt/DbCdvsF9wF8gRK0ptx9M6R13NvBxvVQApfc9jB9nTzphOgM4JiEYvlV8FLhg9\n"\

"yZovMYd6Wwf3aoXK891VQxTr/kQYoq1Yp+68i6T4nNq7NWC+UNVjQHxNQMQMzU6l\n"\

"WCX8zyg3yH88OAQkUXIXKfQ+NkvYQ1cxaMoVPpY72+eVthKzpMeyHkBn7ciumk5q\n"\

"gLTEJAfWZpe4f4eFZj/Rc8Y8Jj2IS5kVPjUywQIDAQABAoIBADhg1u1Mv1hAAlX8\n"\

"omz1Gn2f4AAW2aos2cM5UDCNw1SYmj+9SRIkaxjRsE/C4o9sw1oxrg1/z6kajV0e\n"\

"N/t008FdlVKHXAIYWF93JMoVvIpMmT8jft6AN/y3NMpivgt2inmmEJZYNioFJKZG\n"\

"X+/vKYvsVISZm2fw8NfnKvAQK55yu+GRWBZGOeS9K+LbYvOwcrjKhHz66m4bedKd\n"\

"gVAix6NE5iwmjNXktSQlJMCjbtdNXg/xo1/G4kG2p/MO1HLcKfe1N5FgBiXj3Qjl\n"\

"vgvjJZkh1as2KTgaPOBqZaP03738VnYg23ISyvfT/teArVGtxrmFP7939EvJFKpF\n"\

"1wTxuDkCgYEA7t0DR37zt+dEJy+5vm7zSmN97VenwQJFWMiulkHGa0yU3lLasxxu\n"\

"m0oUtndIjenIvSx6t3Y+agK2F3EPbb0AZ5wZ1p1IXs4vktgeQwSSBdqcM8LZFDvZ\n"\

"uPboQnJoRdIkd62XnP5ekIEIBAfOp8v2wFpSfE7nNH2u4CpAXNSF9HsCgYEA2l8D\n"\

"JrDE5m9Kkn+J4l+AdGfeBL1igPF3DnuPoV67BpgiaAgI4h25UJzXiDKKoa706S0D\n"\

"4XB74zOLX11MaGPMIdhlG+SgeQfNoC5lE4ZWXNyESJH1SVgRGT9nBC2vtL6bxCVV\n"\

"WBkTeC5D6c/QXcai6yw6OYyNNdp0uznKURe1xvMCgYBVYYcEjWqMuAvyferFGV+5\n"\

"nWqr5gM+yJMFM2bEqupD/HHSLoeiMm2O8KIKvwSeRYzNohKTdZ7FwgZYxr8fGMoG\n"\

"PxQ1VK9DxCvZL4tRpVaU5Rmknud9hg9DQG6xIbgIDR+f79sb8QjYWmcFGc1SyWOA\n"\

"SkjlykZ2yt4xnqi3BfiD9QKBgGqLgRYXmXp1QoVIBRaWUi55nzHg1XbkWZqPXvz1\n"\

"I3uMLv1jLjJlHk3euKqTPmC05HoApKwSHeA0/gOBmg404xyAYJTDcCidTg6hlF96\n"\

"ZBja3xApZuxqM62F6dV4FQqzFX0WWhWp5n301N33r0qR6FumMKJzmVJ1TA8tmzEF\n"\

"yINRAoGBAJqioYs8rK6eXzA8ywYLjqTLu/yQSLBn/4ta36K8DyCoLNlNxSuox+A5\n"\

"w6z2vEfRVQDq4Hm4vBzjdi3QfYLNkTiTqLcvgWZ+eX44ogXtdTDO7c+GeMKWz4XX\n"\

"uJSUVL5+CVjKLjZEJ6Qc2WZLl94xSwL71E41H4YciVnSCQxVc4Jw\n"\

"-----END RSA PRIVATE KEY-----\n";

unsigned char  encrypted[]={};

unsigned char decrypted[]={};

int encrypted_length= public_encrypt(plainText,strlen(plainText),publicKey,encrypted);

if(encrypted_length == -)

{

    printLastError("Public Encrypt failed ");

    exit();

}

printf("Encrypted length =%d\n",encrypted_length);

char *b64text;

Base64Encode( encrypted, encrypted_length, &b64text);

printf("Base64Encode = %s\n", b64text);

int decrypted_length = private_decrypt(encrypted,encrypted_length,privateKey, decrypted);

if(decrypted_length == -)

{

    printLastError("Private Decrypt failed ");

    exit();

}

printf("Decrypted Text =%s\n",decrypted);

printf("Decrypted Length =%d\n",decrypted_length);

encrypted_length= private_encrypt(plainText,strlen(plainText),privateKey,encrypted);

if(encrypted_length == -)

{

    printLastError("Private Encrypt failed");

    exit();

}

printf("Encrypted length =%d\n",encrypted_length);

decrypted_length = public_decrypt(encrypted,encrypted_length,publicKey, decrypted);

if(decrypted_length == -)

{

    printLastError("Public Decrypt failed");

    exit();

}

printf("Decrypted Text =%s\n",decrypted);

printf("Decrypted Length =%d\n",decrypted_length);

}

编译执行之后，可以得到加密之后的base64数据：

./example

Encrypted length =

Base64Encode = BXFuS6snRRhYUQhTYKG00UoGMzaptbZpaw7h+JEA+yP1sEd5dXaBEjdzzZ8jXRVfjigYFj41zEBSDsafxO440+vi/aODOAY1f4Q2dKf5eBLnXDyN9uT6uxCp67XgZC3YkN+iufMOKIEjSbb361kZrRLwl+6OUt4EYvkhmKl5YpklM+qQYyGW5xyCU5MYMUTXJoAthRTeNuoloSiZDQWKPH4i7bVfR/XDjXIA3iNWfoy5552L4AdtyRhRNvZ0RerbVtPqdWABvJX39hbskmGuzY9HtoxOQaoD0IWGHx29VmCM3JRrTvStnEKjYnUNT9ikbeK1gXX5JjU6HmLHbgPKUg==

Decrypted Text =

Decrypted Length =

Encrypted length =

Decrypted Text =

Decrypted Length =

把base64数据，传递给go语言（这里需要把对应的go语言的公钥、私钥替换成c语言中的示例），用私钥进行解密，可以得到对应的原始数据，这样验证 c 和 go之间的加解密OK。

go run rsa.go -d BXFuS6snRRhYUQhTYKG00UoGMzaptbZpaw7h+JEA+yP1sEd5dXaBEjdzzZ8jXRVfjigYFj41zEBSDsafxO440+vi/aODOAY1f4Q2dKf5eBLnXDyN9uT6uxCp67XgZC3YkN+iufMOKIEjSbb361kZrRLwl+6OUt4EYvkhmKl5YpklM+qQYyGW5xyCU5MYMUTXJoAthRTeNuoloSiZDQWKPH4i7bVfR/XDjXIA3iNWfoy5552L4AdtyRhRNvZ0RerbVtPqdWABvJX39hbskmGuzY9HtoxOQaoD0IWGHx29VmCM3JRrTvStnEKjYnUNT9ikbeK1gXX5JjU6HmLHbgPKUg==

[1024]

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