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cpython/Modules/md5module.c

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/* MD5 module */
/* This module provides an interface to the MD5 algorithm */
/* See below for information about the original code this module was
based upon. Additional work performed by:
Andrew Kuchling (amk@amk.ca)
Greg Stein (gstein@lyra.org)
Trevor Perrin (trevp@trevp.net)
Copyright (C) 2005-2007 Gregory P. Smith (greg@krypto.org)
Licensed to PSF under a Contributor Agreement.
*/
/* MD5 objects */
#include "Python.h"
#include "hashlib.h"
/* Some useful types */
#if SIZEOF_INT == 4
typedef unsigned int MD5_INT32; /* 32-bit integer */
typedef PY_LONG_LONG MD5_INT64; /* 64-bit integer */
#else
/* not defined. compilation will die. */
#endif
/* The MD5 block size and message digest sizes, in bytes */
#define MD5_BLOCKSIZE 64
#define MD5_DIGESTSIZE 16
/* The structure for storing MD5 info */
struct md5_state {
MD5_INT64 length;
MD5_INT32 state[4], curlen;
unsigned char buf[MD5_BLOCKSIZE];
};
typedef struct {
PyObject_HEAD
struct md5_state hash_state;
} MD5object;
/* ------------------------------------------------------------------------
*
* This code for the MD5 algorithm was noted as public domain. The
* original headers are pasted below.
*
* Several changes have been made to make it more compatible with the
* Python environment and desired interface.
*
*/
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
/* rotate the hard way (platform optimizations could be done) */
#define ROLc(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
/* Endian Neutral macros that work on all platforms */
#define STORE32L(x, y) \
{ (y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
(y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
#define LOAD32L(x, y) \
{ x = ((unsigned long)((y)[3] & 255)<<24) | \
((unsigned long)((y)[2] & 255)<<16) | \
((unsigned long)((y)[1] & 255)<<8) | \
((unsigned long)((y)[0] & 255)); }
#define STORE64L(x, y) \
{ (y)[7] = (unsigned char)(((x)>>56)&255); (y)[6] = (unsigned char)(((x)>>48)&255); \
(y)[5] = (unsigned char)(((x)>>40)&255); (y)[4] = (unsigned char)(((x)>>32)&255); \
(y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
(y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
#ifndef MIN
#define MIN(x, y) ( ((x)<(y))?(x):(y) )
#endif
/* MD5 macros */
#define F(x,y,z) (z ^ (x & (y ^ z)))
#define G(x,y,z) (y ^ (z & (y ^ x)))
#define H(x,y,z) (x^y^z)
#define I(x,y,z) (y^(x|(~z)))
#define FF(a,b,c,d,M,s,t) \
a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;
#define GG(a,b,c,d,M,s,t) \
a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;
#define HH(a,b,c,d,M,s,t) \
a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;
#define II(a,b,c,d,M,s,t) \
a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;
static void md5_compress(struct md5_state *md5, unsigned char *buf)
{
MD5_INT32 i, W[16], a, b, c, d;
assert(md5 != NULL);
assert(buf != NULL);
/* copy the state into 512-bits into W[0..15] */
for (i = 0; i < 16; i++) {
LOAD32L(W[i], buf + (4*i));
}
/* copy state */
a = md5->state[0];
b = md5->state[1];
c = md5->state[2];
d = md5->state[3];
FF(a,b,c,d,W[0],7,0xd76aa478UL)
FF(d,a,b,c,W[1],12,0xe8c7b756UL)
FF(c,d,a,b,W[2],17,0x242070dbUL)
FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
FF(a,b,c,d,W[4],7,0xf57c0fafUL)
FF(d,a,b,c,W[5],12,0x4787c62aUL)
FF(c,d,a,b,W[6],17,0xa8304613UL)
FF(b,c,d,a,W[7],22,0xfd469501UL)
FF(a,b,c,d,W[8],7,0x698098d8UL)
FF(d,a,b,c,W[9],12,0x8b44f7afUL)
FF(c,d,a,b,W[10],17,0xffff5bb1UL)
FF(b,c,d,a,W[11],22,0x895cd7beUL)
FF(a,b,c,d,W[12],7,0x6b901122UL)
FF(d,a,b,c,W[13],12,0xfd987193UL)
FF(c,d,a,b,W[14],17,0xa679438eUL)
FF(b,c,d,a,W[15],22,0x49b40821UL)
GG(a,b,c,d,W[1],5,0xf61e2562UL)
GG(d,a,b,c,W[6],9,0xc040b340UL)
GG(c,d,a,b,W[11],14,0x265e5a51UL)
GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
GG(a,b,c,d,W[5],5,0xd62f105dUL)
GG(d,a,b,c,W[10],9,0x02441453UL)
GG(c,d,a,b,W[15],14,0xd8a1e681UL)
GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
GG(a,b,c,d,W[9],5,0x21e1cde6UL)
GG(d,a,b,c,W[14],9,0xc33707d6UL)
GG(c,d,a,b,W[3],14,0xf4d50d87UL)
GG(b,c,d,a,W[8],20,0x455a14edUL)
GG(a,b,c,d,W[13],5,0xa9e3e905UL)
GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
GG(c,d,a,b,W[7],14,0x676f02d9UL)
GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
HH(a,b,c,d,W[5],4,0xfffa3942UL)
HH(d,a,b,c,W[8],11,0x8771f681UL)
HH(c,d,a,b,W[11],16,0x6d9d6122UL)
HH(b,c,d,a,W[14],23,0xfde5380cUL)
HH(a,b,c,d,W[1],4,0xa4beea44UL)
HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
HH(b,c,d,a,W[10],23,0xbebfbc70UL)
HH(a,b,c,d,W[13],4,0x289b7ec6UL)
HH(d,a,b,c,W[0],11,0xeaa127faUL)
HH(c,d,a,b,W[3],16,0xd4ef3085UL)
HH(b,c,d,a,W[6],23,0x04881d05UL)
HH(a,b,c,d,W[9],4,0xd9d4d039UL)
HH(d,a,b,c,W[12],11,0xe6db99e5UL)
HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
HH(b,c,d,a,W[2],23,0xc4ac5665UL)
II(a,b,c,d,W[0],6,0xf4292244UL)
II(d,a,b,c,W[7],10,0x432aff97UL)
II(c,d,a,b,W[14],15,0xab9423a7UL)
II(b,c,d,a,W[5],21,0xfc93a039UL)
II(a,b,c,d,W[12],6,0x655b59c3UL)
II(d,a,b,c,W[3],10,0x8f0ccc92UL)
II(c,d,a,b,W[10],15,0xffeff47dUL)
II(b,c,d,a,W[1],21,0x85845dd1UL)
II(a,b,c,d,W[8],6,0x6fa87e4fUL)
II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
II(c,d,a,b,W[6],15,0xa3014314UL)
II(b,c,d,a,W[13],21,0x4e0811a1UL)
II(a,b,c,d,W[4],6,0xf7537e82UL)
II(d,a,b,c,W[11],10,0xbd3af235UL)
II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
II(b,c,d,a,W[9],21,0xeb86d391UL)
md5->state[0] = md5->state[0] + a;
md5->state[1] = md5->state[1] + b;
md5->state[2] = md5->state[2] + c;
md5->state[3] = md5->state[3] + d;
}
/**
Initialize the hash state
@param sha1 The hash state you wish to initialize
*/
void md5_init(struct md5_state *md5)
{
assert(md5 != NULL);
md5->state[0] = 0x67452301UL;
md5->state[1] = 0xefcdab89UL;
md5->state[2] = 0x98badcfeUL;
md5->state[3] = 0x10325476UL;
md5->curlen = 0;
md5->length = 0;
}
/**
Process a block of memory though the hash
@param sha1 The hash state
@param in The data to hash
@param inlen The length of the data (octets)
*/
void md5_process(struct md5_state *md5,
const unsigned char *in, unsigned long inlen)
{
unsigned long n;
assert(md5 != NULL);
assert(in != NULL);
assert(md5->curlen <= sizeof(md5->buf));
while (inlen > 0) {
if (md5->curlen == 0 && inlen >= MD5_BLOCKSIZE) {
md5_compress(md5, (unsigned char *)in);
md5->length += MD5_BLOCKSIZE * 8;
in += MD5_BLOCKSIZE;
inlen -= MD5_BLOCKSIZE;
} else {
n = MIN(inlen, (MD5_BLOCKSIZE - md5->curlen));
memcpy(md5->buf + md5->curlen, in, (size_t)n);
md5->curlen += n;
in += n;
inlen -= n;
if (md5->curlen == MD5_BLOCKSIZE) {
md5_compress(md5, md5->buf);
md5->length += 8*MD5_BLOCKSIZE;
md5->curlen = 0;
}
}
}
}
/**
Terminate the hash to get the digest
@param sha1 The hash state
@param out [out] The destination of the hash (16 bytes)
*/
void md5_done(struct md5_state *md5, unsigned char *out)
{
int i;
assert(md5 != NULL);
assert(out != NULL);
assert(md5->curlen < sizeof(md5->buf));
/* increase the length of the message */
md5->length += md5->curlen * 8;
/* append the '1' bit */
md5->buf[md5->curlen++] = (unsigned char)0x80;
/* if the length is currently above 56 bytes we append zeros
* then compress. Then we can fall back to padding zeros and length
* encoding like normal.
*/
if (md5->curlen > 56) {
while (md5->curlen < 64) {
md5->buf[md5->curlen++] = (unsigned char)0;
}
md5_compress(md5, md5->buf);
md5->curlen = 0;
}
/* pad upto 56 bytes of zeroes */
while (md5->curlen < 56) {
md5->buf[md5->curlen++] = (unsigned char)0;
}
/* store length */
STORE64L(md5->length, md5->buf+56);
md5_compress(md5, md5->buf);
/* copy output */
for (i = 0; i < 4; i++) {
STORE32L(md5->state[i], out+(4*i));
}
}
/* .Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
/* .Revision: 1.10 $ */
/* .Date: 2007/05/12 14:25:28 $ */
/*
* End of copied MD5 code.
*
* ------------------------------------------------------------------------
*/
static PyTypeObject MD5type;
static MD5object *
newMD5object(void)
{
return (MD5object *)PyObject_New(MD5object, &MD5type);
}
/* Internal methods for a hash object */
static void
MD5_dealloc(PyObject *ptr)
{
PyObject_Del(ptr);
}
/* External methods for a hash object */
PyDoc_STRVAR(MD5_copy__doc__, "Return a copy of the hash object.");
static PyObject *
MD5_copy(MD5object *self, PyObject *unused)
{
MD5object *newobj;
if (Py_TYPE(self) == &MD5type) {
if ( (newobj = newMD5object())==NULL)
return NULL;
} else {
if ( (newobj = newMD5object())==NULL)
return NULL;
}
newobj->hash_state = self->hash_state;
return (PyObject *)newobj;
}
PyDoc_STRVAR(MD5_digest__doc__,
"Return the digest value as a string of binary data.");
static PyObject *
MD5_digest(MD5object *self, PyObject *unused)
{
unsigned char digest[MD5_DIGESTSIZE];
struct md5_state temp;
temp = self->hash_state;
md5_done(&temp, digest);
return PyBytes_FromStringAndSize((const char *)digest, MD5_DIGESTSIZE);
}
PyDoc_STRVAR(MD5_hexdigest__doc__,
"Return the digest value as a string of hexadecimal digits.");
static PyObject *
MD5_hexdigest(MD5object *self, PyObject *unused)
{
unsigned char digest[MD5_DIGESTSIZE];
struct md5_state temp;
PyObject *retval;
Py_UNICODE *hex_digest;
int i, j;
/* Get the raw (binary) digest value */
temp = self->hash_state;
md5_done(&temp, digest);
/* Create a new string */
retval = PyUnicode_FromStringAndSize(NULL, MD5_DIGESTSIZE * 2);
if (!retval)
return NULL;
hex_digest = PyUnicode_AS_UNICODE(retval);
if (!hex_digest) {
Py_DECREF(retval);
return NULL;
}
/* Make hex version of the digest */
for(i=j=0; i<MD5_DIGESTSIZE; i++) {
char c;
c = (digest[i] >> 4) & 0xf;
c = (c>9) ? c+'a'-10 : c + '0';
hex_digest[j++] = c;
c = (digest[i] & 0xf);
c = (c>9) ? c+'a'-10 : c + '0';
hex_digest[j++] = c;
}
return retval;
}
PyDoc_STRVAR(MD5_update__doc__,
"Update this hash object's state with the provided string.");
static PyObject *
MD5_update(MD5object *self, PyObject *args)
{
PyObject *obj;
Py_buffer buf;
if (!PyArg_ParseTuple(args, "O:update", &obj))
return NULL;
GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
md5_process(&self->hash_state, buf.buf, buf.len);
PyBuffer_Release(&buf);
Py_INCREF(Py_None);
return Py_None;
}
static PyMethodDef MD5_methods[] = {
{"copy", (PyCFunction)MD5_copy, METH_NOARGS, MD5_copy__doc__},
{"digest", (PyCFunction)MD5_digest, METH_NOARGS, MD5_digest__doc__},
{"hexdigest", (PyCFunction)MD5_hexdigest, METH_NOARGS, MD5_hexdigest__doc__},
{"update", (PyCFunction)MD5_update, METH_VARARGS, MD5_update__doc__},
{NULL, NULL} /* sentinel */
};
static PyObject *
MD5_get_block_size(PyObject *self, void *closure)
{
return PyLong_FromLong(MD5_BLOCKSIZE);
}
static PyObject *
MD5_get_name(PyObject *self, void *closure)
{
return PyUnicode_FromStringAndSize("MD5", 3);
}
static PyObject *
md5_get_digest_size(PyObject *self, void *closure)
{
return PyLong_FromLong(MD5_DIGESTSIZE);
}
static PyGetSetDef MD5_getseters[] = {
{"block_size",
(getter)MD5_get_block_size, NULL,
NULL,
NULL},
{"name",
(getter)MD5_get_name, NULL,
NULL,
NULL},
{"digest_size",
(getter)md5_get_digest_size, NULL,
NULL,
NULL},
{NULL} /* Sentinel */
};
static PyTypeObject MD5type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_md5.md5", /*tp_name*/
sizeof(MD5object), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
MD5_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
MD5_methods, /* tp_methods */
NULL, /* tp_members */
MD5_getseters, /* tp_getset */
};
/* The single module-level function: new() */
PyDoc_STRVAR(MD5_new__doc__,
"Return a new MD5 hash object; optionally initialized with a string.");
static PyObject *
MD5_new(PyObject *self, PyObject *args, PyObject *kwdict)
{
static char *kwlist[] = {"string", NULL};
MD5object *new;
PyObject *data_obj = NULL;
Py_buffer buf;
if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
&data_obj)) {
return NULL;
}
if (data_obj)
GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
if ((new = newMD5object()) == NULL) {
if (data_obj)
PyBuffer_Release(&buf);
return NULL;
}
md5_init(&new->hash_state);
if (PyErr_Occurred()) {
Py_DECREF(new);
if (data_obj)
PyBuffer_Release(&buf);
return NULL;
}
if (data_obj) {
md5_process(&new->hash_state, buf.buf, buf.len);
PyBuffer_Release(&buf);
}
return (PyObject *)new;
}
/* List of functions exported by this module */
static struct PyMethodDef MD5_functions[] = {
{"md5", (PyCFunction)MD5_new, METH_VARARGS|METH_KEYWORDS, MD5_new__doc__},
{NULL, NULL} /* Sentinel */
};
/* Initialize this module. */
#define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
static struct PyModuleDef _md5module = {
PyModuleDef_HEAD_INIT,
"_md5",
NULL,
-1,
MD5_functions,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__md5(void)
{
Py_TYPE(&MD5type) = &PyType_Type;
if (PyType_Ready(&MD5type) < 0)
return NULL;
return PyModule_Create(&_md5module);
}
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