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// Author: cirakg & claude ai
// Summary: One interface over SHA-1, SHA-256 (native) and SHA-512 (pure Monkey C).
//
// Connect IQ has native SHA-1 and SHA-256 (Toybox.Cryptography.Hash) but no
// SHA-512, which source/crypto/Sha512.mc implements from FIPS 180-4. OTP code
// asks for an algorithm by its Hashes.Algorithm value and doesn't care which
// implementation answers.
import Toybox.Cryptography;
import Toybox.Lang;
module Hashes {
// OTP and HMAC hash algorithms. The values are stored in entry records, so
// never renumber them.
enum Algorithm {
SHA1 = 0,
SHA256 = 1,
SHA512 = 2
}
// Input block size in bytes (what HMAC pads its key to).
function blockSize(alg as Algorithm) as Number {
return alg == SHA512 ? 128 : 64;
}
// Digest length in bytes.
function digestSize(alg as Algorithm) as Number {
if (alg == SHA1) {
return 20;
}
return alg == SHA256 ? 32 : 64;
}
// True for the three supported values (input from settings or imports is
// checked with this before it becomes an Algorithm).
function isValid(value as Number) as Boolean {
return value == SHA1 || value == SHA256 || value == SHA512;
}
// The digest of data.
function digest(alg as Algorithm, data as ByteArray) as ByteArray {
if (alg == SHA512) {
return Sha512.digest(data);
}
var hash = new Cryptography.Hash({
:algorithm => alg == SHA1 ? Cryptography.HASH_SHA1 : Cryptography.HASH_SHA256
});
if (data.size() > 0) {
hash.update(data);
}
return hash.digest();
}
}
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