阅读和验证证书 [英] Reading and Verifying Certificates

问题描述

您好，我有两个证书，即mycert.crt和root.crt。我需要verfiy如果我的证书是由根证书签名。
我使用下面的代码这样做使用下面的代码，但我得到一个错误
分段错误（内核转储）

Hi I have two certificates, i.e mycert.crt and root.crt. and I need to verfiy if my certificate is signed by root certificate. I am using the following code to do so using the following code but I am getting an error Segmentation fault (core dumped)

static int verifyCerti (BYTE *cert1, BYTE *cert2, int certlenght1, int certlenght2);

int main (int ac, char **av)
{
    FILE     *f_in, *f_in2;
    BYTE     *certBuf, *certBuf2;
    UINT32   certBufLen,certBufLen2;
    UINT32   certLen,certLen2;
    int      result;


    //////////// Reading first certificate/////

    certBufLen = 0;
    certBuf = malloc (1);
    //for (i=0; i<nCerts; i++) {
    if ((f_in = fopen (av[1], "rb")) == NULL) {
        fprintf (stderr, "Unable to open file %s for input\n", av[1]);
        exit (1);
    }
    fseek (f_in, 0, SEEK_END);
    certLen = ftell (f_in);
    fseek (f_in, 0, SEEK_SET);
    certBuf = realloc (certBuf, certBufLen + certLen);

    if (fread (certBuf+certBufLen, 1, certLen, f_in) != certLen) {
        fprintf (stderr, "Failed to read file %s\n", av[1]);
        exit (1);
    }
    if (certBuf[certBufLen] != 0x30) {
        fprintf (stderr, "Certificate file %s not in binary format\n", av[1]);
        exit (1);
    }
    fclose (f_in);
    printf ("we reach here %s \n", av[1]);


    ////////////////Reading second certificate/////////////////////////////////////////////////


    certBufLen2 = 0;
    certBuf2 = malloc (1);
    if ((f_in2 = fopen (av[2], "rb")) == NULL) {
        fprintf (stderr, "Unable to open file %s for input\n", av[2]);
        exit (1);
    }
    fseek (f_in2, 0, SEEK_END);
    certLen2 = ftell (f_in2);
    fseek (f_in2, 0, SEEK_SET);
    certBuf2 = realloc (certBuf2, certBufLen2 + certLen2);

    if (fread (certBuf2+certBufLen2, 1, certLen2, f_in2) != certLen2) {
        fprintf (stderr, "Failed to read file %s\n", av[2]);
        exit (1);
    }
    if (certBuf2[certBufLen2] != 0x30) {
        fprintf (stderr, "Certificate file %s not in binary format\n", av[2]);
        exit (1);
    }
    fclose (f_in2);

    printf ("we reach here %s \n", av[2]);

    if (verifyCerti (certBuf, certBuf2, certBufLen, certBufLen2) < 0) {
        fprintf (stderr, "Certificate chain is incorrect\n");
        exit (1);
    }
}

static int verifyCerti (BYTE *cert1, BYTE *cert2, int certLen1, int certLen2)
{

    X509 *root;
    X509 *mycert;

    root = d2i_X509 (NULL, (unsigned char const **)&cert2, certLen2);
    mycert = d2i_X509 (NULL, (unsigned char const **)&cert1, certLen1);

    //Get root certificate into root
    //Get mycert into mycert.

    //Get the public key.

    EVP_PKEY *pubkey = X509_get_pubkey(root);


    //verify. result less than or 0 means not verified or some error.

    int result = X509_verify(mycert, pubkey);

    //free the public key.

    EVP_PKEY_free(pubkey);

    return result;    
}

错误是我认为因为X509_verify（），但我不确定

The error is i think because of X509_verify(), but I am not sure.

推荐答案

函数的目的是验证pkey（公钥）是否用serverCert验证， key。

The purpose of the function is to verify if the pkey (public key) verifies with the serverCert signed with a corresponding private key..

你应该实际传递的第二个参数是公共密钥，其相应的私钥已经签署了在parameter1传递的证书。我不认为您传递的是正确的公钥。

What you should actually be passing as the second parameter is the public key, whose corresponding private key had signed the certificate passed in parameter1. I don't think you are passing the correct public key.

尝试使用错误代码来获取失败。

Try to get the error codes for the failure using.

unsigned int errCode = ERR_get_error();

printf("\nError: %s\n", ERR_error_string(errCode, NULL));
printf("\nLib: %s\n", ERR_lib_error_string(errCode));
printf("\nFunc: %s\n", ERR_func_error_string(errCode));
printf("\nReason: %s\n", ERR_reason_error_string(errCode));

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