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//! `SHA-256`.
//!
//! There has been considerable degradation of public confidence in the
//! security conjectures for many hash functions, including `SHA-256`.
//! However, for the moment, there do not appear to be alternatives that
//! inspire satisfactory levels of confidence. One can hope that NIST's
//! SHA-3 competition will improve the situation.
use ffi::{crypto_hash_sha256,
          crypto_hash_sha256_state,
          crypto_hash_sha256_init,
          crypto_hash_sha256_update,
          crypto_hash_sha256_final,
          crypto_hash_sha256_BYTES};

hash_module!(crypto_hash_sha256,
             crypto_hash_sha256_state,
             crypto_hash_sha256_init,
             crypto_hash_sha256_update,
             crypto_hash_sha256_final,
             crypto_hash_sha256_BYTES,
             64);

#[cfg(test)]
mod test {
    use super::*;
    #[cfg(not(feature = "std"))] use prelude::*;

    #[test]
    fn test_vector_1() {
        // hash of empty string
        let x = [];
        let h_expected = [0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
                          0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
                          0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
                          0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55];
        let Digest(h) = hash(&x);
        assert!(h == h_expected);
    }

    #[test]
    fn test_vector_2() {
        // The quick brown fox jumps over the lazy dog
        let x = [0x54, 0x68, 0x65, 0x20, 0x71, 0x75, 0x69, 0x63,
                 0x6b, 0x20, 0x62, 0x72, 0x6f, 0x77, 0x6e, 0x20,
                 0x66, 0x6f, 0x78, 0x20, 0x6a, 0x75, 0x6d, 0x70,
                 0x73, 0x20, 0x6f, 0x76, 0x65, 0x72, 0x20, 0x74,
                 0x68, 0x65, 0x20, 0x6c, 0x61, 0x7a, 0x79, 0x20,
                 0x64, 0x6f, 0x67];
        let h_expected = [0xd7, 0xa8, 0xfb, 0xb3, 0x07, 0xd7, 0x80, 0x94,
                          0x69, 0xca, 0x9a, 0xbc, 0xb0, 0x08, 0x2e, 0x4f,
                          0x8d, 0x56, 0x51, 0xe4, 0x6d, 0x3c, 0xdb, 0x76,
                          0x2d, 0x02, 0xd0, 0xbf, 0x37, 0xc9, 0xe5, 0x92];
        let Digest(h) = hash(&x);
        assert!(h == h_expected);
    }

    fn test_nist_vector(filename: &str) {
        use rustc_serialize::hex::FromHex;
        use std::fs::File;
        use std::io::{BufRead, BufReader};

        let mut r = BufReader::new(File::open(filename).unwrap());
        let mut line = String::new();
        loop {
            line.clear();
            r.read_line(&mut line).unwrap();
            if line.len() == 0 {
                break;
            }
            let starts_with_len = line.starts_with("Len = ");
            if  starts_with_len {
                let len: usize = line[6..].trim().parse().unwrap();
                line.clear();
                r.read_line(&mut line).unwrap();
                let rawmsg = line[6..].from_hex().unwrap();
                let msg = &rawmsg[..len/8];
                line.clear();
                r.read_line(&mut line).unwrap();
                let md = line[5..].from_hex().unwrap();
                let Digest(digest) = hash(msg);
                assert!(&digest[..] == &md[..]);
            }
        }
    }

    #[test]
    fn test_vectors_nist_short() {
        test_nist_vector("testvectors/SHA256ShortMsg.rsp");
    }

    #[test]
    fn test_vectors_nist_long() {
        test_nist_vector("testvectors/SHA256LongMsg.rsp");
    }

    #[test]
    fn test_hash_state_empty() {
        // hash of empty string
        let h_expected = [0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
                          0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
                          0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
                          0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55];
        let hash_state = State::new();
        let Digest(h) = hash_state.finalize();
        assert!(h == h_expected);
    }

    #[test]
    fn test_hash_state_multi_parts() {
        // The quick brown fox jumps over the lazy dog
        let x = [0x54, 0x68, 0x65, 0x20, 0x71, 0x75, 0x69, 0x63,
                 0x6b, 0x20, 0x62, 0x72, 0x6f, 0x77, 0x6e, 0x20,
                 0x66, 0x6f, 0x78, 0x20, 0x6a, 0x75, 0x6d, 0x70,
                 0x73, 0x20, 0x6f, 0x76, 0x65, 0x72, 0x20, 0x74,
                 0x68, 0x65, 0x20, 0x6c, 0x61, 0x7a, 0x79, 0x20,
                 0x64, 0x6f, 0x67];
        let h_expected = [0xd7, 0xa8, 0xfb, 0xb3, 0x07, 0xd7, 0x80, 0x94,
                          0x69, 0xca, 0x9a, 0xbc, 0xb0, 0x08, 0x2e, 0x4f,
                          0x8d, 0x56, 0x51, 0xe4, 0x6d, 0x3c, 0xdb, 0x76,
                          0x2d, 0x02, 0xd0, 0xbf, 0x37, 0xc9, 0xe5, 0x92];
        let mut hash_state = State::new();
        for chunk in x.chunks(3) {
            hash_state.update(chunk);
        }
        let Digest(h) = hash_state.finalize();
        assert!(h == h_expected);
    }
}