/** @throws UnsupportedOperationException if not supported */
public MessageDigest getDigestInstance() {
if (digestName.equals("SHA-1")) return SHA1.getInstance();
if (digestName.equals("SHA-256")) return SHA256Generator.getDigestInstance();
try {
return MessageDigest.getInstance(digestName);
} catch (NoSuchAlgorithmException e) {
throw new UnsupportedOperationException(e);
}
}
/**
* Reads the stream until EOF. Does not close the stream.
*
* @return hash SHA-1 hash, NOT a SHA-256 hash
*/
public SHA1Hash calculateHash(InputStream in) {
MessageDigest digest = SHA1.getInstance();
byte buf[] = new byte[64];
int read = 0;
try {
while ((read = in.read(buf)) != -1) {
digest.update(buf, 0, read);
}
} catch (IOException ioe) {
if (_log.shouldLog(Log.WARN)) _log.warn("Unable to hash the stream", ioe);
return null;
}
return new SHA1Hash(digest.digest());
}
@Provides
@Singleton
SHA1 provideSHA1() {
return SHA1.getInstance();
}
/** @return hash SHA-1 hash, NOT a SHA-256 hash */
public static SHA1Hash calculateHash(byte[] source, int offset, int len) {
MessageDigest h = SHA1.getInstance();
h.update(source, offset, len);
byte digested[] = h.digest();
return new SHA1Hash(digested);
}