* @param cert certificate for which issuer ca info is required
* @return ca info, or NULL if not found
*/
- ca_info_t* (*get_issuer) (credential_store_t *this, const x509_t* cert);
+ ca_info_t* (*get_issuer) (credential_store_t *this, x509_t* cert);
/**
* @brief Verify an RSA signature given the ID of the signer