Thank you for your help, but it doesn't work at all.
I need to sign a "char * msg" to obtain a "char * (or similar)"
for sending a signed mail.
I'm using for it Dr Stephen N Henson (you're great) sign program, which I call
in "sign(x509,pkey,data,p7);".
Afterwards I write the p7 object with "PEM_write_PKCS7(stdout,p7);" and it
works ok. But just when I try to cast it to unsigned char * I'm getting a
Segmentation Fault.
Thanks Patrik and Dr. Henson, in advance.
void sign_pkcs7(char *msg,unsigned char *der){
X509 *x509;
EVP_PKEY *pkey;
PKCS7 *p7;
BIO *in;
BIO *data;
int i;
unsigned char *msg_aux,*buf;
if (inf) printf("Funcion que construye la firma PKCS7\n");
data=BIO_new(BIO_s_bio());
if ((in=BIO_new_file("server.pem","r")) == NULL) goto err;
if ((x509=PEM_read_bio_X509(in,NULL,NULL,NULL)) == NULL) goto err;
BIO_reset(in);
if ((pkey=PEM_read_bio_PrivateKey(in,NULL,NULL,NULL)) == NULL) goto err;
BIO_free(in);
BIO_set_ex_data(data,sizeof(msg),msg);
p7=PKCS7_new();
sign(x509,pkey,data,p7);
printf("Now I will print the p7 object\n");
PEM_write_PKCS7(stdout,p7);
/*Here I've got the problem*/
/*printf("mark1\n");*/ /*I know if there is a segmentation fault, it won't
show the marks... but...*/
i=i2d_PKCS7(p7,NULL);
/*printf("mark2\n");*/
buf=malloc(i);
/*printf("mark3\n");*/
msg_aux=buf;
/*printf("mark4\n");*/
i=i2d_PKCS7(p7,&msg_aux);
printf("Printting PKCS7\n%s\n",msg_aux);
strcpy(der,msg_aux);
PKCS7_free(p7);
goto ok;
err:
ERR_load_crypto_strings();
ERR_print_errors_fp(stderr);
exit(-1);
ok:
}
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