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    use libc::*;

    pub type SHA_LONG = c_uint;

    pub const SHA_LBLOCK: c_int = 16;

    #[repr(C)]
    #[derive(Clone)]
    pub struct SHA_CTX {
        pub h0: SHA_LONG,
        pub h1: SHA_LONG,
        pub h2: SHA_LONG,
        pub h3: SHA_LONG,
        pub h4: SHA_LONG,
        pub Nl: SHA_LONG,
        pub Nh: SHA_LONG,
        pub data: [SHA_LONG; SHA_LBLOCK as usize],
        pub num: c_uint,
    }

    extern "C" {
        pub fn SHA1_Init(c: *mut SHA_CTX) -> c_int;
        pub fn SHA1_Update(c: *mut SHA_CTX, data: *const c_void, len: size_t) -> c_int;
        pub fn SHA1_Final(md: *mut c_uchar, c: *mut SHA_CTX) -> c_int;
        pub fn SHA1(d: *const c_uchar, n: size_t, md: *mut c_uchar) -> *mut c_uchar;
    }

    #[repr(C)]
    #[derive(Clone)]
    pub struct SHA256_CTX {
        pub h: [SHA_LONG; 8],
        pub Nl: SHA_LONG,
        pub Nh: SHA_LONG,
        pub data: [SHA_LONG; SHA_LBLOCK as usize],
        pub num: c_uint,
        pub md_len: c_uint,
    }

    extern "C" {
        pub fn SHA224_Init(c: *mut SHA256_CTX) -> c_int;
        pub fn SHA224_Update(c: *mut SHA256_CTX, data: *const c_void, len: size_t) -> c_int;
        pub fn SHA224_Final(md: *mut c_uchar, c: *mut SHA256_CTX) -> c_int;
        pub fn SHA224(d: *const c_uchar, n: size_t, md: *mut c_uchar) -> *mut c_uchar;
        pub fn SHA256_Init(c: *mut SHA256_CTX) -> c_int;
        pub fn SHA256_Update(c: *mut SHA256_CTX, data: *const c_void, len: size_t) -> c_int;
        pub fn SHA256_Final(md: *mut c_uchar, c: *mut SHA256_CTX) -> c_int;
        pub fn SHA256(d: *const c_uchar, n: size_t, md: *mut c_uchar) -> *mut c_uchar;
    }

    pub type SHA_LONG64 = u64;

    #[repr(C)]
    #[derive(Clone)]
    pub struct SHA512_CTX {
        pub h: [SHA_LONG64; 8],
        pub Nl: SHA_LONG64,
        pub Nh: SHA_LONG64,
        // this is a union but we don't want to require 1.19
        u: [SHA_LONG64; SHA_LBLOCK as usize],
        pub num: c_uint,
        pub md_len: c_uint,
    }

    extern "C" {
        pub fn SHA384_Init(c: *mut SHA512_CTX) -> c_int;
        pub fn SHA384_Update(c: *mut SHA512_CTX, data: *const c_void, len: size_t) -> c_int;
        pub fn SHA384_Final(md: *mut c_uchar, c: *mut SHA512_CTX) -> c_int;
        pub fn SHA384(d: *const c_uchar, n: size_t, md: *mut c_uchar) -> *mut c_uchar;
        pub fn SHA512_Init(c: *mut SHA512_CTX) -> c_int;
        pub fn SHA512_Update(c: *mut SHA512_CTX, data: *const c_void, len: size_t) -> c_int;
        pub fn SHA512_Final(md: *mut c_uchar, c: *mut SHA512_CTX) -> c_int;
        pub fn SHA512(d: *const c_uchar, n: size_t, md: *mut c_uchar) -> *mut c_uchar;
    }