sk_X509_pop_free(a->cert,X509_free);
sk_X509_CRL_pop_free(a->crl,X509_CRL_free);
sk_PKCS7_SIGNER_INFO_pop_free(a->signer_info,PKCS7_SIGNER_INFO_free);
sk_X509_pop_free(a->cert,X509_free);
sk_X509_CRL_pop_free(a->crl,X509_CRL_free);
sk_PKCS7_SIGNER_INFO_pop_free(a->signer_info,PKCS7_SIGNER_INFO_free);