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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
/* Copyright (c) Jython Developers */
package org.python.modules;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;
import org.python.core.ClassDictInit;
import org.python.core.Py;
import org.python.core.PyArray;
import org.python.core.PyFrozenSet;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.core.PyTuple;
import org.python.core.PyType;
import org.python.core.PyUnicode;
import org.python.core.Untraversable;
import org.python.core.util.StringUtil;
import org.python.expose.ExposedGet;
import org.python.expose.ExposedMethod;
import org.python.expose.ExposedType;
/**
* The Python _hashlib module: provides hashing algorithms via
* java.security.MessageDigest.
*
* The 'openssl' method prefix is to match CPython and provide what the pure python
* hashlib.py module expects.
*/
public class _hashlib implements ClassDictInit {
/** A mapping of Python algorithm names to MessageDigest names. */
private static final Map algorithmMap = new HashMap() {{
put("sha1", "sha-1");
put("sha224", "sha-224");
put("sha256", "sha-256");
put("sha384", "sha-384");
put("sha512", "sha-512");
}};
public static final PyFrozenSet openssl_md_meth_names =
new PyFrozenSet(new PyTuple(Py.newString("md5"), Py.newString("sha1"),
Py.newString("sha224"), Py.newString("sha256"), Py.newString("sha384"),
Py.newString("sha512")));
public static void classDictInit(PyObject dict) {
dict.__setitem__("__name__", Py.newString("_hashlib"));
dict.__setitem__("algorithmMap", null);
dict.__setitem__("classDictInit", null);
}
public static PyObject new$(String name) {
return new$(name, null);
}
public static PyObject new$(String name, PyObject obj) {
name = name.toLowerCase();
// NOTE: we're not disallowing other MessageDigest algorithms
if (algorithmMap.containsKey(name)) {
name = algorithmMap.get(name);
}
Hash hash = new Hash(name);
if (obj != null) {
hash.update(obj);
}
return hash;
}
public static PyObject openssl_md5() {
return openssl_md5(null);
}
public static PyObject openssl_md5(PyObject obj) {
return new$("md5", obj);
}
public static PyObject openssl_sha1() {
return openssl_sha1(null);
}
public static PyObject openssl_sha1(PyObject obj) {
return new$("sha1", obj);
}
public static PyObject openssl_sha224() {
return openssl_sha224(null);
}
public static PyObject openssl_sha224(PyObject obj) {
return new$("sha224", obj);
}
public static PyObject openssl_sha256() {
return openssl_sha256(null);
}
public static PyObject openssl_sha256(PyObject obj) {
return new$("sha256", obj);
}
public static PyObject openssl_sha384() {
return openssl_sha384(null);
}
public static PyObject openssl_sha384(PyObject obj) {
return new$("sha384", obj);
}
public static PyObject openssl_sha512() {
return openssl_sha512(null);
}
public static PyObject openssl_sha512(PyObject obj) {
return new$("sha512", obj);
}
/**
* A generic wrapper around a MessageDigest.
*/
@Untraversable
@ExposedType(name = "_hashlib.HASH")
public static class Hash extends PyObject {
public static final PyType TYPE = PyType.fromClass(Hash.class);
/** The hash algorithm name. */
@ExposedGet
public String name;
/** The hashing engine. */
private MessageDigest digest;
/** Supposed block sizes of algorithms for the block_size attribute. */
private static final Map blockSizes = new HashMap() {{
put("md5", 64);
put("sha-1", 64);
put("sha-224", 64);
put("sha-256", 64);
put("sha-384", 128);
put("sha-512", 128);
}};
public Hash(String name) {
this(name, getDigest(name));
}
private Hash(String name, MessageDigest digest) {
super(TYPE);
this.name = name;
this.digest = digest;
}
private static final MessageDigest getDigest(String name) {
try {
// since sha 224 is not present in java.security
if (name.equals("sha-224")) {
return new SHA224Digest();
}
return MessageDigest.getInstance(name);
} catch (NoSuchAlgorithmException nsae) {
throw Py.ValueError("unsupported hash type");
}
}
/**
* Clone the underlying MessageDigest.
*
* @return a copy of MessageDigest
*/
private MessageDigest cloneDigest() {
try {
synchronized (this) {
return (MessageDigest)digest.clone();
}
} catch (CloneNotSupportedException cnse) {
throw Py.RuntimeError(String.format("_hashlib.HASH (%s) internal error", name));
}
}
/**
* Safely calculate the digest without resetting state.
*
* @return a byte[] calculated digest
*/
private byte[] calculateDigest() {
return cloneDigest().digest();
}
public void update(PyObject obj) {
HASH_update(obj);
}
@ExposedMethod
final void HASH_update(PyObject obj) {
String string;
if (obj instanceof PyUnicode) {
string = ((PyUnicode)obj).encode();
} else if (obj instanceof PyString) {
string = obj.toString();
} else if (obj instanceof PyArray) {
string = ((PyArray)obj).tostring();
} else {
throw Py.TypeError("update() argument 1 must be string or read-only buffer, not "
+ obj.getType().fastGetName());
}
byte[] input = StringUtil.toBytes(string);
synchronized (this) {
digest.update(input);
}
}
public PyObject digest() {
return HASH_digest();
}
@ExposedMethod
final PyObject HASH_digest() {
return Py.newString(StringUtil.fromBytes(calculateDigest()));
}
public PyObject hexdigest() {
return HASH_hexdigest();
}
@ExposedMethod
final PyObject HASH_hexdigest() {
byte[] result = calculateDigest();
// Make hex version of the digest
char[] hexDigest = new char[result.length * 2];
for (int i = 0, j = 0; i < result.length; i++) {
int c = ((result[i] >> 4) & 0xf);
c = c > 9 ? c + 'a' - 10 : c + '0';
hexDigest[j++] = (char)c;
c = result[i] & 0xf;
c = c > 9 ? c + 'a' - 10 : c + '0';
hexDigest[j++] = (char)c;
}
return Py.newString(new String(hexDigest));
}
public PyObject copy() {
return HASH_copy();
}
@ExposedMethod
final PyObject HASH_copy() {
return new Hash(name, cloneDigest());
}
@ExposedGet(name = "digestsize")
public synchronized int getDigestSize() {
return digest.getDigestLength();
}
@ExposedGet(name = "digest_size")
public int getDigest_size() {
return getDigestSize();
}
@ExposedGet(name = "block_size")
public PyObject getBlockSize() {
Integer size = blockSizes.get(name);
if (size == null) {
return Py.None;
}
return Py.newInteger(size);
}
@Override
public String toString() {
return String.format("<%s HASH object @ %s>", name, Py.idstr(this));
}
}
}