Hello!
I am really new with programming with OpenSSL, and I have the following
problem. I hope somebody can help me.
I am working with OpenSSL version 0.9.5a, under windows 98. I am using
the borland c++ compiler version 5.5. I have taken the example sign.c
from the demo directory, and I have changed some function calls
(different numbers of parameters), afterwards I have compiled and have
the exe generated. But it just won't work, it appears the following
error:
4294662763:error:0906B072:PEM
routines:PEM_get_EVP_CIPHER_INFO:unsupported
encryption:.\crypto\pem\pem_lib.c:506:
Can anybody tell me, what does this error means, and how can I correct
the programm so that it does work properly? Here is how the program
looks like
//---------------------------------------------------------------------------
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
# include <openssl/rsa.h>
# include <openssl/evp.h>
# include <openssl/objects.h>
# include <openssl/x509.h>
# include <openssl/err.h>
# include <openssl/pem.h>
# include <openssl/ssl.h>
void main()
{
int err;
int sig_len;
unsigned char sig_buf [4096];
/* I have generated this certificate using OpenSSL */
static char certfile[] = "certificado.pem";
static char keyfile[] = "privada.pem";
static char data[] = "This is the signed data";
EVP_MD_CTX md_ctx;
EVP_PKEY *pkey;
FILE *fp;
X509 *x509;
/* Just load the crypto library error strings,
* SSL_load_error_strings() loads the crypto AND the SSL ones */
/* SSL_load_error_strings();*/
ERR_load_crypto_strings();
/* Read private key */
fp = fopen (keyfile, "r");
if (fp == NULL)
exit (1);
pkey = PEM_read_PrivateKey(fp, NULL,NULL,NULL);
/* I have detected, that the error appears here. I think pkey takes the
value NULL, but I do not know why ! */
if (pkey == NULL)
{
ERR_print_errors_fp (stderr);
exit (1);
}
fclose(fp);
/* Do the signature */
EVP_SignInit(&md_ctx, EVP_md5());
EVP_SignUpdate(&md_ctx, data, strlen(data));
sig_len = sizeof(sig_buf);
err = EVP_SignFinal(&md_ctx,sig_buf,&sig_len,pkey);
if (err != 1)
{
ERR_print_errors_fp (stderr);
exit (1);
}
EVP_PKEY_free (pkey);
/* Read public key */
fp = fopen (certfile, "r");
if (fp == NULL)
exit (1);
x509 = (X509 *)PEM_ASN1_read ((char
*(*)())d2i_X509,PEM_STRING_X509,fp, NULL,NULL,NULL);
if (x509 == NULL)
{
ERR_print_errors_fp (stderr);
exit (1);
}
fclose (fp);
/* Get public key - eay*/
pkey=X509_extract_key(x509);
if (pkey == NULL)
{
ERR_print_errors_fp (stderr);
exit (1);
}
/* Verify the signature */
EVP_VerifyInit (&md_ctx, EVP_md5());
EVP_VerifyUpdate (&md_ctx, data, strlen((char*)data));
err = EVP_VerifyFinal (&md_ctx, sig_buf,sig_len,pkey);
if (err != 1)
{
ERR_print_errors_fp (stderr);
exit (1);
}
EVP_PKEY_free (pkey);
printf("Signature verified!\n");
}
//---------------------------------------------------------------------------
I also get the following warning while compiling
Warning W8075 signatures.c 60: Suspicious pointer conversion in function
main
And this correspondes to the following line:
sig_len = sizeof(sig_buf);
Well, I hope you could help me, thanks in advance
Mariana
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