Apple certificate is invalide with PKCS7_verify

Question

I download AppleRootCertificate.cer and now I try to check if my in-app receipt certificate is valid (same as apples one).

I do it like apple present in his WWDS videos.

    BIO *b_receipt = BIO_new_mem_buf((void *)[receipt bytes], (long)[receipt length]);
    BIO *b_x509 = BIO_new_mem_buf((void *)[certificateData bytes], (long)[certificateData length]);

    // Convert receipt data to PKCS #7 Representation
    PKCS7 * p7 = d2i_PKCS7_bio(b_receipt, NULL);

    // Create the certificate store for matching white Apple cerif.
    X509_STORE * store = X509_STORE_new();
    X509 * appleRootCA = d2i_X509_bio(b_x509, NULL);
    X509_STORE_add_cert(store, appleRootCA);

    // Verify the Signature

    BIO * b_receiptPayload = BIO_new(BIO_s_mem());
    int result = PKCS7_verify(p7, NULL, store, NULL, b_receiptPayload, 0);
    NSLog(@"Result == %i", result); 

but the result is always 0 and not 1.

What do I do wrong?

Answer 1

As suggested by #noloader I print error whit ERR_get_error().

When I get : Error:0D0C50A1:lib(13):func(197):reason(161), I google it and discovered that I need to add this line above :

 OpenSSL_add_all_algorithms();

This solve all my problem :D