/* 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 ([email protected])

Greg Stein ([email protected])

Trevor Perrin ([email protected])

Copyright (C) 2005-2007 Gregory P. Smith ([email protected])

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, [email protected], 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, Py_ssize_t inlen)

{

Py_ssize_t 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, (Py_ssize_t)(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_UCS1 *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_New(MD5_DIGESTSIZE * 2, 127);

if (!retval)

return NULL;

hex_digest = PyUnicode_1BYTE_DATA(retval);

/* Make hex version of the digest */

for(i=j=0; i<MD5_DIGESTSIZE; i++) {

unsigned char c;

c = (digest[i] >> 4) & 0xf;

hex_digest[j++] = Py_hexdigits[c];

c = (digest[i] & 0xf);

hex_digest[j++] = Py_hexdigits[c];

}

assert(_PyUnicode_CheckConsistency(retval, 1));

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);

}