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// crypto_generichash.h

pub const crypto_generichash_BYTES_MIN: usize = crypto_generichash_blake2b_BYTES_MIN;
pub const crypto_generichash_BYTES_MAX: usize = crypto_generichash_blake2b_BYTES_MAX;
pub const crypto_generichash_BYTES: usize = crypto_generichash_blake2b_BYTES;
pub const crypto_generichash_KEYBYTES_MIN: usize = crypto_generichash_blake2b_KEYBYTES_MIN;
pub const crypto_generichash_KEYBYTES_MAX: usize = crypto_generichash_blake2b_KEYBYTES_MAX;
pub const crypto_generichash_KEYBYTES: usize = crypto_generichash_blake2b_KEYBYTES;
pub const crypto_generichash_PRIMITIVE: &str = "blake2b";

#[allow(non_camel_case_types)]
pub enum crypto_generichash_state { }

extern {
    pub fn crypto_generichash_bytes_min() -> size_t;
    pub fn crypto_generichash_bytes_max() -> size_t;
    pub fn crypto_generichash_bytes() -> size_t;
    pub fn crypto_generichash_keybytes_min() -> size_t;
    pub fn crypto_generichash_keybytes_max() -> size_t;
    pub fn crypto_generichash_keybytes() -> size_t;
    pub fn crypto_generichash_primitive() -> *const c_char;

    pub fn crypto_generichash(
        out: *mut u8,
        outlen: size_t,
        in_: *const u8,
        inlen: c_ulonglong,
        key: *const u8,
        keylen: size_t)
        -> c_int;

    pub fn crypto_generichash_init(
        state: *mut crypto_generichash_state,
        key: *const u8,
        keylen: size_t,
        outlen: size_t)
        -> c_int;

    pub fn crypto_generichash_update(
        state: *mut crypto_generichash_state,
        in_: *const u8,
        inlen: c_ulonglong)
        -> c_int;

    pub fn crypto_generichash_final(
        state: *mut crypto_generichash_state,
        out: *mut u8,
        outlen: size_t)
        -> c_int;

    pub fn crypto_generichash_statebytes() -> size_t;
}

#[test]
fn test_crypto_generichash_bytes_min() {
    assert_eq!(unsafe { crypto_generichash_bytes_min() as usize },
                        crypto_generichash_BYTES_MIN)
}

#[test]
fn test_crypto_generichash_bytes_max() {
    assert_eq!(unsafe { crypto_generichash_bytes_max() as usize },
                        crypto_generichash_BYTES_MAX)
}

#[test]
fn test_crypto_generichash_bytes() {
    assert_eq!(unsafe { crypto_generichash_bytes() as usize },
                        crypto_generichash_BYTES)
}

#[test]
fn test_crypto_generichash_keybytes_min() {
    assert_eq!(unsafe { crypto_generichash_keybytes_min() as usize },
                        crypto_generichash_KEYBYTES_MIN)
}

#[test]
fn test_crypto_generichash_keybytes_max() {
    assert_eq!(unsafe { crypto_generichash_keybytes_max() as usize },
                        crypto_generichash_KEYBYTES_MAX)
}

#[test]
fn test_crypto_generichash_keybytes() {
    assert_eq!(unsafe { crypto_generichash_keybytes() as usize },
                        crypto_generichash_KEYBYTES)
}
#[test]
fn test_crypto_generichash_primitive() {
    unsafe {
        let s = crypto_generichash_primitive();
        let s = std::ffi::CStr::from_ptr(s).to_bytes();
        assert_eq!(s, crypto_generichash_PRIMITIVE.as_bytes());
    }
}

#[test]
fn test_crypto_generichash_statebytes() {
    assert!(unsafe { crypto_generichash_statebytes() } > 0);
}

#[test]
fn test_crypto_generichash() {
    let mut out = [0u8; crypto_generichash_BYTES];
    let m = [0u8; 64];
    let key = [0u8; crypto_generichash_KEYBYTES];

    assert_eq!(unsafe {
        crypto_generichash(out.as_mut_ptr(), out.len(),
                           m.as_ptr(), m.len() as u64,
                           key.as_ptr(), key.len())
    }, 0);
}

#[cfg(test)]
use std::mem;

#[test]
fn test_crypto_generichash_multipart() {
    let mut out = [0u8; crypto_generichash_BYTES];
    let m = [0u8; 64];
    let key = [0u8; crypto_generichash_KEYBYTES];

    let mut st = vec![0u8; unsafe { crypto_generichash_statebytes() }];
    let pst = unsafe { mem::transmute::<*mut u8, *mut crypto_generichash_state>(st.as_mut_ptr()) };

    assert_eq!(unsafe {
        crypto_generichash_init(pst,
                                key.as_ptr(), key.len(),
                                out.len())
    }, 0);

    assert_eq!(unsafe {
        crypto_generichash_update(pst,
                                m.as_ptr(), m.len() as u64)
    }, 0);

    assert_eq!(unsafe {
        crypto_generichash_update(pst,
                                m.as_ptr(), m.len() as u64)
    }, 0);

    assert_eq!(unsafe {
        crypto_generichash_final(pst,
                                out.as_mut_ptr(), out.len())
    }, 0);
}