Class Digest

core/src/main/java/io/questdb/std/str/Digest.java:37–134

public class Digest implements Utf8Sink {
    public enum DigestAlgorithm {
        MD5,
        SHA1,
        SHA256,
    }

    private final MessageDigest digest;
    private final byte[] buffer;

    public Digest(@NotNull DigestAlgorithm algorithm) {
        String algo = switch (algorithm) {
            case MD5 -> "MD5";
            case SHA1 -> "SHA-1";
            default -> "SHA-256";
        };
        try {
            this.digest = MessageDigest.getInstance(algo);
        } catch (NoSuchAlgorithmException e) {
            /*
             * Every implementation of the Java platform is required to support the
             * following standard MessageDigest algorithms:
             * - MD5
             * - SHA-1
             * - SHA-256
             */
            throw new RuntimeException("unreachable");
        }
        this.buffer = new byte[digest.getDigestLength()];
    }

    @Override
    public Utf8Sink put(@Nullable Utf8Sequence us) {
        if (us != null) {
            for (int i = 0, n = us.size(); i < n; i++) {
                this.digest.update(us.byteAt(i));
            }
        }
        return this;
    }

    @Override
    public Utf8Sink put(byte b) {
        this.digest.update(b);
        return this;
    }

    @Override
    public Utf8Sink putNonAscii(long lo, long hi) {
        for (long p = lo; p < hi; p++) {
            this.digest.update(Unsafe.getByte(p));
        }
        return this;
    }

    public void hash(@NotNull BinarySequence sequence, @NotNull CharSink<?> sink) {
        for (int i = 0; i < sequence.length(); i++) {
            this.digest.update(sequence.byteAt(i));