340 lines
8.5 KiB
C
340 lines
8.5 KiB
C
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/* MD5 module */
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/* This module provides an interface to the RSA Data Security,
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Inc. MD5 Message-Digest Algorithm, described in RFC 1321.
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It requires the files md5c.c and md5.h (which are slightly changed
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from the versions in the RFC to avoid the "global.h" file.) */
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/* MD5 objects */
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#include "Python.h"
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#include "structmember.h"
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#include "md5.h"
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typedef struct {
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PyObject_HEAD
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md5_state_t md5; /* the context holder */
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} md5object;
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static PyTypeObject MD5type;
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#define is_md5object(v) ((v)->ob_type == &MD5type)
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static md5object *
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newmd5object(void)
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{
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md5object *md5p;
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md5p = PyObject_New(md5object, &MD5type);
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if (md5p == NULL)
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return NULL;
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md5_init(&md5p->md5); /* actual initialisation */
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return md5p;
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}
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/* MD5 methods */
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static void
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md5_dealloc(md5object *md5p)
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{
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PyObject_Del(md5p);
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}
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/* MD5 methods-as-attributes */
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static PyObject *
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md5_update(md5object *self, PyObject *args)
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{
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Py_buffer view;
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Py_ssize_t n;
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unsigned char *buf;
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if (!PyArg_ParseTuple(args, "s*:update", &view))
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return NULL;
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n = view.len;
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buf = (unsigned char *) view.buf;
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while (n > 0) {
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Py_ssize_t nbytes;
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if (n > INT_MAX)
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nbytes = INT_MAX;
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else
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nbytes = n;
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md5_append(&self->md5, buf,
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Py_SAFE_DOWNCAST(nbytes, Py_ssize_t, unsigned int));
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buf += nbytes;
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n -= nbytes;
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}
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PyBuffer_Release(&view);
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(update_doc,
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"update (arg)\n\
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\n\
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Update the md5 object with the string arg. Repeated calls are\n\
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equivalent to a single call with the concatenation of all the\n\
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arguments.");
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static PyObject *
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md5_digest(md5object *self)
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{
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md5_state_t mdContext;
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unsigned char aDigest[16];
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/* make a temporary copy, and perform the final */
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mdContext = self->md5;
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md5_finish(&mdContext, aDigest);
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return PyString_FromStringAndSize((char *)aDigest, 16);
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}
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PyDoc_STRVAR(digest_doc,
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"digest() -> string\n\
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\n\
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Return the digest of the strings passed to the update() method so\n\
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far. This is a 16-byte string which may contain non-ASCII characters,\n\
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including null bytes.");
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static PyObject *
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md5_hexdigest(md5object *self)
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{
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md5_state_t mdContext;
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unsigned char digest[16];
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unsigned char hexdigest[32];
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int i, j;
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/* make a temporary copy, and perform the final */
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mdContext = self->md5;
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md5_finish(&mdContext, digest);
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/* Make hex version of the digest */
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for(i=j=0; i<16; i++) {
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char c;
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c = (digest[i] >> 4) & 0xf;
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c = (c>9) ? c+'a'-10 : c + '0';
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hexdigest[j++] = c;
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c = (digest[i] & 0xf);
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c = (c>9) ? c+'a'-10 : c + '0';
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hexdigest[j++] = c;
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}
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return PyString_FromStringAndSize((char*)hexdigest, 32);
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}
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PyDoc_STRVAR(hexdigest_doc,
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"hexdigest() -> string\n\
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\n\
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Like digest(), but returns the digest as a string of hexadecimal digits.");
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static PyObject *
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md5_copy(md5object *self)
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{
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md5object *md5p;
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if ((md5p = newmd5object()) == NULL)
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return NULL;
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md5p->md5 = self->md5;
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return (PyObject *)md5p;
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}
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PyDoc_STRVAR(copy_doc,
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"copy() -> md5 object\n\
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\n\
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Return a copy (``clone'') of the md5 object.");
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static PyMethodDef md5_methods[] = {
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{"update", (PyCFunction)md5_update, METH_VARARGS, update_doc},
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{"digest", (PyCFunction)md5_digest, METH_NOARGS, digest_doc},
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{"hexdigest", (PyCFunction)md5_hexdigest, METH_NOARGS, hexdigest_doc},
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{"copy", (PyCFunction)md5_copy, METH_NOARGS, copy_doc},
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{NULL, NULL} /* sentinel */
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};
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static PyObject *
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md5_get_block_size(PyObject *self, void *closure)
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{
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return PyInt_FromLong(64);
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}
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static PyObject *
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md5_get_digest_size(PyObject *self, void *closure)
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{
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return PyInt_FromLong(16);
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}
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static PyObject *
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md5_get_name(PyObject *self, void *closure)
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{
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return PyString_FromStringAndSize("MD5", 3);
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}
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static PyGetSetDef md5_getseters[] = {
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{"digest_size",
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(getter)md5_get_digest_size, NULL,
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NULL,
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NULL},
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{"block_size",
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(getter)md5_get_block_size, NULL,
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NULL,
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NULL},
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{"name",
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(getter)md5_get_name, NULL,
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NULL,
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NULL},
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/* the old md5 and sha modules support 'digest_size' as in PEP 247.
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* the old sha module also supported 'digestsize'. ugh. */
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{"digestsize",
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(getter)md5_get_digest_size, NULL,
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NULL,
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NULL},
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{NULL} /* Sentinel */
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};
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PyDoc_STRVAR(module_doc,
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"This module implements the interface to RSA's MD5 message digest\n\
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algorithm (see also Internet RFC 1321). Its use is quite\n\
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straightforward: use the new() to create an md5 object. You can now\n\
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feed this object with arbitrary strings using the update() method, and\n\
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at any point you can ask it for the digest (a strong kind of 128-bit\n\
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checksum, a.k.a. ``fingerprint'') of the concatenation of the strings\n\
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fed to it so far using the digest() method.\n\
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\n\
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Functions:\n\
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\n\
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new([arg]) -- return a new md5 object, initialized with arg if provided\n\
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md5([arg]) -- DEPRECATED, same as new, but for compatibility\n\
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\n\
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Special Objects:\n\
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\n\
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MD5Type -- type object for md5 objects");
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PyDoc_STRVAR(md5type_doc,
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"An md5 represents the object used to calculate the MD5 checksum of a\n\
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string of information.\n\
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\n\
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Methods:\n\
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\n\
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update() -- updates the current digest with an additional string\n\
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digest() -- return the current digest value\n\
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hexdigest() -- return the current digest as a string of hexadecimal digits\n\
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copy() -- return a copy of the current md5 object");
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static PyTypeObject MD5type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"_md5.md5", /*tp_name*/
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sizeof(md5object), /*tp_size*/
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0, /*tp_itemsize*/
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/* methods */
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(destructor)md5_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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md5type_doc, /*tp_doc*/
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0, /*tp_traverse*/
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0, /*tp_clear*/
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0, /*tp_richcompare*/
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0, /*tp_weaklistoffset*/
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0, /*tp_iter*/
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0, /*tp_iternext*/
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md5_methods, /*tp_methods*/
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0, /*tp_members*/
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md5_getseters, /*tp_getset*/
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};
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/* MD5 functions */
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static PyObject *
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MD5_new(PyObject *self, PyObject *args)
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{
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md5object *md5p;
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Py_buffer view = { 0 };
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Py_ssize_t n;
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unsigned char *buf;
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if (!PyArg_ParseTuple(args, "|s*:new", &view))
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return NULL;
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if ((md5p = newmd5object()) == NULL) {
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PyBuffer_Release(&view);
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return NULL;
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}
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n = view.len;
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buf = (unsigned char *) view.buf;
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while (n > 0) {
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Py_ssize_t nbytes;
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if (n > INT_MAX)
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nbytes = INT_MAX;
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else
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nbytes = n;
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md5_append(&md5p->md5, buf,
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Py_SAFE_DOWNCAST(nbytes, Py_ssize_t, unsigned int));
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buf += nbytes;
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n -= nbytes;
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}
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PyBuffer_Release(&view);
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return (PyObject *)md5p;
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}
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PyDoc_STRVAR(new_doc,
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"new([arg]) -> md5 object\n\
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\n\
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Return a new md5 object. If arg is present, the method call update(arg)\n\
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is made.");
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/* List of functions exported by this module */
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static PyMethodDef md5_functions[] = {
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{"new", (PyCFunction)MD5_new, METH_VARARGS, new_doc},
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{NULL, NULL} /* Sentinel */
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};
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/* Initialize this module. */
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PyMODINIT_FUNC
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init_md5(void)
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{
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PyObject *m, *d;
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Py_TYPE(&MD5type) = &PyType_Type;
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if (PyType_Ready(&MD5type) < 0)
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return;
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m = Py_InitModule3("_md5", md5_functions, module_doc);
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if (m == NULL)
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return;
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d = PyModule_GetDict(m);
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PyDict_SetItemString(d, "MD5Type", (PyObject *)&MD5type);
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PyModule_AddIntConstant(m, "digest_size", 16);
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/* No need to check the error here, the caller will do that */
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}
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