gmssl国密总结

1、gmssl组成

分为加密和通信两部分

2、加密

主要指的是sm2 sm3 sm4加密算法，以及相关的加密组件

3、通信

指的是gmtls

按照一个 GM/T 0024-2014规范实现的，采用双证书，签名证书+加密证书

4、生成证书

可使用地址https://github.com/jntass/TASSL/tree/master/Tassl_demo/mk_tls_cert 下的SM2certgen.sh生成双证书。

注意：生成请求时指定的摘要算法 在用请求生成证书时并不生效，需要重新指定，否则会使用默认的算法rsa-sha256

针对gmssl,签名算法一定要是sm2sign-with-sm3

针对tassl,只要加密用的是sm2即可，sm2sign-with-sm3不是必须

5、兼容性

指的是gmssl对openssl的兼容性

ssl/tls下，仅支持有限的套件：

ECDHE-SM2-WITH-SMS4-SM3

ECDHE-SM2-WITH-SMS4-SHA256

不是完全兼容的

采用老的openssl证书，要指定tls版本为1或1.2才可以，或者直接使用TSLv1_2_method，使用TSL_method不可以，号称的会自己检测版本并没有实现，貌似默认是使用1.1版本

6、双证书

gmssl对双证书和双密钥的设置

直接设置两个sm2证书和密钥就可以，没有新增接口，都是代码里自己适配：

keyusagedigitalSignature 类型的证书是签名证书，否则是加密证书,密钥呢，加密证书存在的时候是加密密钥，否则是签名密钥

这个其实是有漏洞的，必须先设置签名证书。。然后才是加密证书

tassl是有的，增加了一个设置加密密钥的接口SSL_use_enc_PrivateKey，设置证书的接口也是代码里适配的,证书类型需要keyusage（keyAgreementkeyEnciphermentdataEncipherment）

7、版本

以上总结仅针对GmSSL最新版(v2.3.1)和tassl当前最新版(2018-09-17)

8、最新版的openssl已经支持国密算法

仅仅支持国密的算法，通信还未支持

9、编程实现

server.c：

#include <stdio.h>

#include <string.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/ssl.h>

#include <openssl/pem.h>

#include <openssl/err.h>

#include <sys/socket.h>

#include <unistd.h>

#include <netinet/in.h> 

//#define CERTSERVER "/tmp/testopenssl/demoCA/cacert.pem"

//#define KEYSERVER "/tmp/testopenssl/demoCA/private/cakey.pem"

#define CERTSERVER "SS.pem"

#define KEYSERVER "SS.key.pem"

#define SM2_SERVER_ENC_CERT    "SE.pem"

#define SM2_SERVER_ENC_KEY      "SE.key.pem"

#define CHK_ERR(err, s) if((err) == -1) { perror(s); return -1; }else printf("%s  success! ",s);

#define CHK_RV(rv, s) if((rv) != 1) { printf("%s error ", s); return -1; }else printf("%s  success! ",s);

#define CHK_NULL(x, s) if((x) == NULL) { printf("%s error ", s); return -1; }else printf("%s  success! ",s);

#define CHK_SSL(err, s) if((err) == -1) { ERR_print_errors_fp(stderr);  return -1;}else printf("%s  success! ",s);

int main()

{

int rv, err;

SSL_CTX *ctx = NULL;

SSL_METHOD *meth = NULL;

int listen_sd;

int accept_sd;

struct sockaddr_in socketAddrServer;

struct sockaddr_in socketAddrClient;

socklen_t socketAddrClientLen;

SSL *ssl = NULL;

char buf[4096];

rv = SSL_library_init();

CHK_RV(rv, "SSL_library_init");

meth = (SSL_METHOD *)GMTLS_server_method();

ctx = SSL_CTX_new(meth);

CHK_NULL(ctx, "SSL_CTX_new");

rv = SSL_CTX_use_certificate_file(ctx, CERTSERVER, SSL_FILETYPE_PEM);

CHK_RV(rv, "SSL_CTX_use_certicificate_file");

rv = SSL_CTX_use_PrivateKey_file(ctx, KEYSERVER, SSL_FILETYPE_PEM);

CHK_RV(rv, "SSL_CTX_use_PrivateKey_file");

rv = SSL_CTX_check_private_key(ctx);

CHK_RV(rv, "SSL_CTX_check_private_key");

rv = SSL_CTX_use_certificate_file(ctx, SM2_SERVER_ENC_CERT, SSL_FILETYPE_PEM);

CHK_RV(rv, "SSL_CTX_use_certicificate_file2");

rv = SSL_CTX_use_PrivateKey_file(ctx, SM2_SERVER_ENC_KEY, SSL_FILETYPE_PEM);

CHK_RV(rv, "SSL_CTX_use_PrivateKey_file2");

rv = SSL_CTX_check_private_key(ctx);

CHK_RV(rv, "SSL_CTX_check_private_key2");

SSL_CTX_set_security_level(ctx, 0);

listen_sd = socket(AF_INET, SOCK_STREAM, 0);

CHK_ERR(listen_sd, "socket");

memset(&socketAddrServer, 0, sizeof(socketAddrServer));

socketAddrServer.sin_family = AF_INET;

socketAddrServer.sin_port = htons(8443);

socketAddrServer.sin_addr.s_addr = INADDR_ANY;

err = bind(listen_sd, (struct sockaddr *)&socketAddrServer, sizeof(socketAddrServer));

CHK_ERR(err, "bind");

err = listen(listen_sd, 5);

CHK_ERR(err, "listen");

socketAddrClientLen = sizeof(socketAddrClient);

accept_sd = accept(listen_sd, (struct sockaddr *)&socketAddrClient, &socketAddrClientLen);

CHK_ERR(accept_sd, "accept");

close(listen_sd);

printf("Connect from %lx, port %x ", socketAddrClient.sin_addr.s_addr, socketAddrClient.sin_port);

ssl = SSL_new(ctx);

CHK_NULL(ssl, "SSL_new");

rv = SSL_set_fd(ssl, accept_sd);

CHK_RV(rv, "SSL_set_fd");

rv = SSL_accept(ssl);

CHK_RV(rv, "SSL_accpet");

/* Check for Client authentication error */

  if (SSL_get_verify_result(ssl) != X509_V_OK) {

  printf("SSL Client Authentication error ");

  SSL_free(ssl);

  close(accept_sd);

  SSL_CTX_free(ctx);

  exit(0);

  }

/*Print out connection details*/

printf("SSL connection on socket %x,Version: %s, Cipher: %s ",

accept_sd,

SSL_get_version(ssl),

SSL_get_cipher(ssl));

rv = SSL_read(ssl, buf, sizeof(buf) - 1);

CHK_SSL(rv, "SSL_read");

buf[rv] = '';

printf("Got %d chars :%s ", rv, buf);

rv = SSL_write(ssl, "I accept your request", strlen("I accept your request"));

CHK_SSL(rv, "SSL_write");

close(accept_sd);

SSL_free(ssl);

SSL_CTX_free(ctx);

return 0;

}

client.c：

#include <stdio.h>

#include <string.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/ssl.h>

#include <openssl/pem.h>

#include <openssl/err.h>

#include <sys/socket.h>

#include <unistd.h>

#include <netinet/in.h> 

#include <arpa/inet.h>

#include <iostream>

#define SERVER_IP      "127.0.0.1"

#define SERVER_PORT    8443

int main( int argc, char* argv[] ) {

  int ret;

  ////////////

  // 初始化 //

  ////////////

  SSL_CTX* ctx;

  SSL_METHOD *meth;

  OpenSSL_add_ssl_algorithms();

  SSL_load_error_strings();

  //meth = (SSL_METHOD *)TLS_client_method();

  meth = (SSL_METHOD *)GMTLS_client_method();

  ctx = SSL_CTX_new (meth);

  if (!ctx) {

    ERR_print_errors_fp(stderr);

    std::cout<<"SSL_CTX_new error."<<std::endl;

    return -1;

  }

  //SSL_CTX_set_cipher_list(ctx, "ECDHE-RSA-AES256-GCM-SHA384");

//  SSL_CTX_set_max_proto_version(ctx,TLS1_2_VERSION);

//  SSL_CTX_set_min_proto_version(ctx,TLS1_2_VERSION);

  ///////////////////////

  // 建立原始的TCP连接 //

  ///////////////////////

  int client_socket;

  struct sockaddr_in addr_server;

  client_socket = socket (AF_INET, SOCK_STREAM, 0); 

  if( client_socket == -1  ) {

    std::cout<<"socket error."<<std::endl;

    return -1;

  }

  memset (&addr_server, 0, sizeof(addr_server));

  addr_server.sin_family          = AF_INET;

  addr_server.sin_addr.s_addr = inet_addr(SERVER_IP);

  addr_server.sin_port            = htons (SERVER_PORT);

  ret = connect(client_socket, (struct sockaddr*) &addr_server, sizeof(addr_server));

  if( ret == -1  ) {

    std::cout<<"connect error."<<std::endl;

    return -1;

  }

  /////////////////////////////////////

  // TCP连接已经建立，执行Client SSL //

  /////////////////////////////////////

  SSL*    ssl;

  X509*    server_certificate;

  char*    str;

  ssl = SSL_new (ctx);                       

  if( ssl == NULL ) {

    std::cout<<"SSL_new error."<<std::endl;

    return -1;

  }

  SSL_set_fd (ssl, client_socket);

  ret = SSL_connect (ssl);                   

  if( ret == -1 ) {

    std::cout<<"SSL_connect error."<<std::endl;

ERR_print_errors_fp(stderr);

    return -1;

  }

    ERR_print_errors_fp(stderr);

  // 接下来的获取密码和获取服务器端证书的两部是可选的，不会影响数据交换

  // 获取cipher

  std::cout<<"SSL connection using: "<<SSL_get_cipher(ssl)<<std::endl;

  // 获取服务器端的证书

  server_certificate = SSL_get_peer_certificate (ssl);     

  if( server_certificate != NULL ) {

    std::cout<<"Server certificate:"<<std::endl;

    str = X509_NAME_oneline (X509_get_subject_name (server_certificate),0,0);

    if( str == NULL ) {

      std::cout<<"X509_NAME_oneline error."<<std::endl;

    } else {

      std::cout<<"subject: "<<str<<std::endl;

      OPENSSL_free (str);

    }

    str = X509_NAME_oneline (X509_get_issuer_name  (server_certificate),0,0);

    if( str == NULL ) {

      std::cout<<"X509_NAME_oneline error."<<std::endl;

    } else {

      std::cout<<"issuer: "<<str<<std::endl;

      OPENSSL_free (str);

    }

    X509_free (server_certificate);

  } else {

    std::cout<<"Server does not have certificate. we sould Esc!"<<std::endl;

    return -1;

  }

  ////////////////

  //  数据交换  //

  ////////////////

  char    buf [4096];

  ret = SSL_write (ssl, "Hello World!", strlen("Hello World!")); 

  if( ret == -1 ) {

    std::cout<<"SSL_write error."<<std::endl;

    return -1;

  }

  ret = SSL_read (ssl, buf, sizeof(buf) - 1); 

  if( ret == -1 ) {

    std::cout<<"SSL_read error."<<std::endl;

    return -1;

  }

  buf[ret] = '';

  std::cout<<buf<<std::endl;

  SSL_shutdown(ssl);  /* send SSL/TLS close_notify */

  /////////////

  // Cleanup //

  /////////////

  close(client_socket);

  SSL_free (ssl);

  SSL_CTX_free (ctx);

  return 0;

}

作者：高文茂
链接：https://www.jianshu.com/p/0dc9708e34de
来源：简书
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