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//! OSX specific functionality for keys.
use core_foundation::base::TCFType;
use core_foundation::data::CFData;
use core_foundation::dictionary::CFDictionary;
use core_foundation::error::CFError;
use core_foundation::string::CFString;
use security_framework_sys::item::kSecAttrKeyType;
use security_framework_sys::key::*;
use std::ptr;

use key::SecKey;
use os::macos::item::KeyType;

/// An extension trait adding OSX specific functionality to `SecKey`.
pub trait SecKeyExt {
    /// Creates a new `SecKey` from a buffer containing key data.
    fn from_data(key_type: KeyType, key_data: &CFData) -> Result<SecKey, CFError>;
}

impl SecKeyExt for SecKey {
    fn from_data(key_type: KeyType, key_data: &CFData) -> Result<SecKey, CFError> {
        unsafe {
            let key = CFString::wrap_under_get_rule(kSecAttrKeyType);
            let dict = CFDictionary::from_CFType_pairs(&[(key, key_type.to_str())]);

            let mut err = ptr::null_mut();
            let key = SecKeyCreateFromData(
                dict.as_concrete_TypeRef(),
                key_data.as_concrete_TypeRef(),
                &mut err,
            );
            if key.is_null() {
                Err(CFError::wrap_under_create_rule(err))
            } else {
                Ok(SecKey::wrap_under_create_rule(key))
            }
        }
    }
}