Issues with SHA1 hash implementation in Android

Question

I have two small snippets for calculating SHA1.

One is very fast but it seems that it isn\'t correct and the other is very slow but correct.
I think the F

Answer 1

Do this:

MessageDigest md = MessageDigest.getInstance("SHA1");
InputStream in = new FileInputStream("hereyourinputfilename");
byte[] buf = new byte[8192];
for (;;) {
    int len = in.read(buf);
    if (len < 0)
        break;
    md.update(buf, 0, len);
}
in.close();
byte[] hash = md.digest();

Performance comes from handling data by blocks. An 8 kB buffer, as here, ought to be blocky enough. You do not have to use a BufferedInputStream since the 8 kB buffer also serves as I/O buffer.