Silvia Gisela Pavon Velasco wrote:
I'm trying to sign a file and when I try to compile it I get the following
warning in the EVP_SignFinal function:
$ cc -o sign_test -I/opt/openssl/include -lssl -lcrypto sign_test.c
cc: "sign_test.c", line 43: warning 604: Pointers are not
assignment-compatible.
cc: "sign_test.c", line 43: warning 563: Argument #3 is not the correct
type.
the third argument should be a pointer to a "unsigned int"
Although that warning I run the program but I get the next output:
$ sign_test
Key Size is 128 bytes
Sign size is
How should I declare the bytes_firma variable? Or the error is somewhere
else?
Code extract:
*******************************************************************
// Signing
unsigned char *firma;
int bytes_leidos;
int bytes_firma;
EVP_MD_CTX ctx;
char buf[TAM_BUF];
int err;
firma = (unsigned char *) malloc(EVP_PKEY_size(clave_EVP));
EVP_SignInit_ex(&ctx, EVP_md5(), NULL);
while (!feof(fp_ext)){
bytes_leidos = fread( (void *) buf, sizeof(char), TAM_BUF, fp_ext);
EVP_SignUpdate(&ctx, (void *) buf, bytes_leidos);
}//while
err = EVP_SignFinal(&ctx, firma, &bytes_firma, clave_EVP);m <-- in this
line occurs the error
if (err != 1){
ERR_print_errors_fp(stderr);
exit (1);
}//if
printf("Sign size is %s\n",bytes_firma);
you might try %d instead of %s ;-)
Nils
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