Question

亲爱的所有我制作的c ++代码，以签署消息m_digestData [DATA_SIZE + RSA_KEY_SIZE]。这些消息最初由一些长度为13字节的数据和长度为RSA_KEY_SIZE的256字节（2048位）的加密共享密钥组成。我只有RSA m_caKeyPairs结构，所以我首先将私钥存储在priv_key中，然后使用sign函数，我试图使用函数ERR_print_errors（）创建一个错误文件来存储错误。代码

OpenSSL_add_all_ciphers();
OpenSSL_add_all_digests();

//create private key
EVP_PKEY *priv_key = NULL;
priv_key = EVP_PKEY_new();
EVP_PKEY_set1_RSA(priv_key,m_caKeyPairs);

cout<<"i'm in sign digest"<<endl;

BIO *sgerr = NULL;
const char szPath[MAX_FILE_NAME_SIZE] = "sgerr.pem";
sgerr = BIO_new_file(szPath,"wb");
unsigned int *len = NULL;
unsigned char *sign = NULL;
EVP_MD_CTX *ctx = NULL;
ctx = EVP_MD_CTX_create();
const EVP_MD *md = EVP_get_digestbyname("SHA1");

EVP_SignInit(ctx, md);
EVP_SignUpdate(ctx, m_digestData, (DATA_SIZE + RSA_KEY_SIZE));
sign = (unsigned char *)OPENSSL_malloc(EVP_PKEY_size(priv_key));
EVP_SignFinal(ctx, sign, len, priv_key);

for(int i=0;i<(*len);i++)
{
    m_signedDigest[i] = *(sign + i);
}

ERR_print_errors(sgerr);
BIO_free(sgerr);

cout<<"signed digest is "<<endl;
for (int i = 0; i < RSA_KEY_SIZE; i++)
{
    printf("0x%.2x ", m_signedDigest[i]);
}

我的问题是：

错误文件为空
调试代码时出错： No source available for "EVP_SignFinal() at 0xb7ed6c59" for the function EVP_SignFinal(ctx, sign, len, priv_key);

即使我首先使用密钥大小

还有更多想法可以解决这个问题吗？

Answer 1

问题是在符号长度它指针只是使它如下所示并传递给方法作为参考这里是新的代码

      BIO *sgerr = NULL;
  const char szPath[MAX_FILE_NAME_SIZE] = "sgerr.pem";
  sgerr = BIO_new_file(szPath,"wb");

  cout<<"i'm in sign digest"<<endl;
  //create private key
  EVP_PKEY *priv_key = NULL;
  priv_key = EVP_PKEY_new();
  if (1 == EVP_PKEY_set1_RSA(priv_key,m_caKeyPairs))
  {
      int keytype = 0;
      keytype = EVP_PKEY_type(priv_key->type);
      cout<<"key type is "<<keytype<<endl;
         BIO *out = NULL;
         out = BIO_new_file("skey.pem","wb");

         PEM_write_bio_PrivateKey(
             out,                  /* write the key to the file we've opened */
             priv_key,               /* our key from earlier */
             EVP_des_ede3_cbc(), /* default cipher for encrypting the key on disk */
             (unsigned char *)"replace_me",       /* passphrase required for decrypting the key on disk */
             10,                 /* length of the passphrase string */
             NULL,               /* callback for requesting a password */
             NULL                /* data to pass to the callback */
         );
      cout<<"Successful key private created"<<endl;
  }
  else
  {
      cout<<"private key is bad"<<endl;
  }

EVP_MD_CTX *mdctx = NULL;
mdctx = EVP_MD_CTX_create();
size_t signlen = NULL;
//Initialize the DigestSign operation
if (1 == EVP_DigestSignInit(mdctx, NULL, EVP_sha1(), NULL, priv_key))
{
    cout<<"initialize correct"<<endl;
}
else
{
    cout<<"something wrong"<<endl;
}
//update with the message
if (1 == EVP_DigestSignUpdate(mdctx, m_digestData,(DATA_SIZE + RSA_KEY_SIZE)))
{
    cout<<"digest created successfully"<<endl;
    cout<<"digest is "<<endl;
    for (int i = 0; i < DIGEST_SIZE; i++)
    {
        printf("0x%.2x ", m_digest[i]);
    }
    cout<<endl;
}
else
{
    cout<<"something wrong"<<endl;
}
//Finalise the DigestSign operation determine the sign length
if (1 == EVP_DigestSignFinal(mdctx, NULL, &signlen))
{
    cout<<"sign length is "<<signlen<<endl;
}
else
{
    cout<<"something wrong"<<endl;
}

if (1 == EVP_DigestSignFinal(mdctx, m_signedDigest, &signlen))
{
    cout<<"sign successfully created"<<endl;
    cout<<"signed digest is " <<endl;
    for(int i=0;i<RSA_KEY_SIZE;i++)
    {
        printf("0x%.2x ", m_signedDigest[i]);
    }
        cout<<endl;
}
else
{
    cout<<"something wrong"<<endl;
}

注意我在类中使用了一些属性，如m_signedDigest []等等

使用rsa evp签署数据的c ++代码

1 个答案: