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#[cfg(not(openssl))]
pub use sha2::{Digest, Sha256};

#[cfg(openssl)]
use openssl;

#[cfg(openssl)]
#[derive(Clone)]
pub struct Sha256 {
    ctx: sha::Sha256,
}

#[cfg(openssl)]
impl Sha256 {
    pub fn new() -> Sha256 {
        Sha256 {
            ctx: openssl::sha::Sha256::new(),
        }
    }
    pub fn update(&mut self, buf: &[u8]) {
        self.ctx.update(buf);
    }
    pub fn finalize(self) -> [u8; 32] {
        self.ctx.finish()
    }
}

#[test]
fn test_sha256() {
    // https://www.di-mgt.com.au/sha_testvectors.html

    let output = &[
        0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea, 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22,
        0x23, 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c, 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00,
        0x15, 0xad,
    ];

    let mut ctx = Sha256::new();
    ctx.update(&[0x61, 0x62, 0x63]);
    assert_eq!(&ctx.finalize().as_slice(), output);

    let mut ctx = Sha256::new();
    ctx.update(&[0x61]);
    ctx.update(&[0x62]);
    ctx.update(&[0x63]);
    assert_eq!(&ctx.finalize().as_slice(), output);

    let mut ctx = Sha256::new();
    ctx.update(&[0x61, 0x62]);
    ctx.update(&[0x63]);
    assert_eq!(&ctx.finalize().as_slice(), output);

    let mut ctx = Sha256::new();
    ctx.update(&[0x61]);
    ctx.update(&[0x62, 0x63]);
    assert_eq!(&ctx.finalize().as_slice(), output);
}