Mercurial > hg
annotate mercurial/thirdparty/sha1dc/cext.c @ 44082:c3f741bb2f33
sha1dc: declare all variables at begininng of block
This is required to appease ancient C language standards, which
msvc 2008 still requires for Python 2.7 on Windows.
Differential Revision: https://phab.mercurial-scm.org/D7877
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 14 Jan 2020 17:39:12 -0800 |
parents | bde1cd4c99d9 |
children | 29a110e2776e |
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1 #define PY_SSIZE_T_CLEAN |
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2 #include <Python.h> |
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3 |
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4 #include "lib/sha1.h" |
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5 |
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6 #if PY_MAJOR_VERSION >= 3 |
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7 #define IS_PY3K |
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8 #endif |
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9 |
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10 /* helper to switch things like string literal depending on Python version */ |
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11 #ifdef IS_PY3K |
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12 #define PY23(py2, py3) py3 |
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13 #else |
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14 #define PY23(py2, py3) py2 |
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15 #endif |
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16 |
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17 static char sha1dc_doc[] = "Efficient detection of SHA1 collision constructs."; |
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18 |
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19 /* clang-format off */ |
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20 typedef struct { |
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21 PyObject_HEAD |
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22 SHA1_CTX ctx; |
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23 } pysha1ctx; |
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24 /* clang-format on */ |
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25 |
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26 static int pysha1ctx_init(pysha1ctx *self, PyObject *args) |
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27 { |
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28 const char *data = NULL; |
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29 Py_ssize_t len; |
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30 |
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31 SHA1DCInit(&(self->ctx)); |
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32 /* We don't want "safe" sha1s, wherein sha1dc can give you a |
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33 different hash for something that's trying to give you a |
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34 collision. We just want to detect collisions. |
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35 */ |
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36 SHA1DCSetSafeHash(&(self->ctx), 0); |
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37 if (!PyArg_ParseTuple(args, PY23("|s#", "|y#"), &data, &len)) { |
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38 return -1; |
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39 } |
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40 if (data) { |
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41 SHA1DCUpdate(&(self->ctx), data, len); |
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42 } |
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43 return 0; |
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44 } |
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45 |
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46 static void pysha1ctx_dealloc(pysha1ctx *self) |
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47 { |
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48 PyObject_Del(self); |
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49 } |
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50 |
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51 static PyObject *pysha1ctx_update(pysha1ctx *self, PyObject *args) |
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52 { |
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53 const char *data; |
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54 Py_ssize_t len; |
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55 if (!PyArg_ParseTuple(args, PY23("s#", "y#"), &data, &len)) { |
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56 return NULL; |
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57 } |
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58 SHA1DCUpdate(&(self->ctx), data, len); |
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59 Py_RETURN_NONE; |
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60 } |
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61 |
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62 /* it is intentional that this take a ctx by value, as that clones the |
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63 context so we can keep using .update() without poisoning the state |
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64 with padding. |
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65 */ |
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66 static int finalize(SHA1_CTX ctx, unsigned char *hash_out) |
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67 { |
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68 if (SHA1DCFinal(hash_out, &ctx)) { |
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69 PyErr_SetString(PyExc_OverflowError, |
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70 "sha1 collision attack detected"); |
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71 return 0; |
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72 } |
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73 return 1; |
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74 } |
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75 |
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76 static PyObject *pysha1ctx_digest(pysha1ctx *self) |
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77 { |
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78 unsigned char hash[20]; |
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79 if (!finalize(self->ctx, hash)) { |
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80 return NULL; |
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81 } |
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82 return PyBytes_FromStringAndSize((char *)hash, 20); |
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83 } |
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84 |
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85 static PyObject *pysha1ctx_hexdigest(pysha1ctx *self) |
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86 { |
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87 static const char hexdigit[] = "0123456789abcdef"; |
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88 unsigned char hash[20]; |
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89 char hexhash[40]; |
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90 int i; |
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91 if (!finalize(self->ctx, hash)) { |
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92 return NULL; |
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93 } |
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94 for (i = 0; i < 20; ++i) { |
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95 hexhash[i * 2] = hexdigit[hash[i] >> 4]; |
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96 hexhash[i * 2 + 1] = hexdigit[hash[i] & 15]; |
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97 } |
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98 return PyString_FromStringAndSize(hexhash, 40); |
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99 } |
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100 |
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101 static PyTypeObject sha1ctxType; |
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102 |
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103 static PyObject *pysha1ctx_copy(pysha1ctx *self) |
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104 { |
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105 pysha1ctx *clone = (pysha1ctx *)PyObject_New(pysha1ctx, &sha1ctxType); |
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106 if (!clone) { |
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107 return NULL; |
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108 } |
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109 clone->ctx = self->ctx; |
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110 return (PyObject *)clone; |
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111 } |
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112 |
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113 static PyMethodDef pysha1ctx_methods[] = { |
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114 {"update", (PyCFunction)pysha1ctx_update, METH_VARARGS, |
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115 "Update this hash object's state with the provided bytes."}, |
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116 {"digest", (PyCFunction)pysha1ctx_digest, METH_NOARGS, |
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117 "Return the digest value as a string of binary data."}, |
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118 {"hexdigest", (PyCFunction)pysha1ctx_hexdigest, METH_NOARGS, |
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119 "Return the digest value as a string of hexadecimal digits."}, |
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120 {"copy", (PyCFunction)pysha1ctx_copy, METH_NOARGS, |
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121 "Return a copy of the hash object."}, |
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122 {NULL}, |
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123 }; |
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124 |
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125 /* clang-format off */ |
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126 static PyTypeObject sha1ctxType = { |
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127 PyVarObject_HEAD_INIT(NULL, 0) /* header */ |
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128 "sha1dc.sha1", /* tp_name */ |
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129 sizeof(pysha1ctx), /* tp_basicsize */ |
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130 0, /* tp_itemsize */ |
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131 (destructor)pysha1ctx_dealloc, /* tp_dealloc */ |
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132 0, /* tp_print */ |
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133 0, /* tp_getattr */ |
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134 0, /* tp_setattr */ |
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135 0, /* tp_compare */ |
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136 0, /* tp_repr */ |
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137 0, /* tp_as_number */ |
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138 0, /* tp_as_sequence */ |
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139 0, /* tp_as_mapping */ |
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140 0, /* tp_hash */ |
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141 0, /* tp_call */ |
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142 0, /* tp_str */ |
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143 0, /* tp_getattro */ |
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144 0, /* tp_setattro */ |
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145 0, /* tp_as_buffer */ |
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146 Py_TPFLAGS_DEFAULT, /* tp_flags */ |
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147 "sha1 implementation that looks for collisions", /* tp_doc */ |
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148 0, /* tp_traverse */ |
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149 0, /* tp_clear */ |
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150 0, /* tp_richcompare */ |
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151 0, /* tp_weaklistoffset */ |
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152 0, /* tp_iter */ |
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153 0, /* tp_iternext */ |
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154 pysha1ctx_methods, /* tp_methods */ |
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155 0, /* tp_members */ |
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156 0, /* tp_getset */ |
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157 0, /* tp_base */ |
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158 0, /* tp_dict */ |
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159 0, /* tp_descr_get */ |
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160 0, /* tp_descr_set */ |
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161 0, /* tp_dictoffset */ |
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162 (initproc)pysha1ctx_init, /* tp_init */ |
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163 0, /* tp_alloc */ |
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164 }; |
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165 /* clang-format on */ |
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166 |
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167 static PyMethodDef methods[] = { |
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168 {NULL, NULL}, |
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169 }; |
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170 |
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171 static void module_init(PyObject *mod) |
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172 { |
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173 sha1ctxType.tp_new = PyType_GenericNew; |
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174 if (PyType_Ready(&sha1ctxType) < 0) { |
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175 return; |
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176 } |
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177 Py_INCREF(&sha1ctxType); |
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178 |
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179 PyModule_AddObject(mod, "sha1", (PyObject *)&sha1ctxType); |
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180 } |
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181 |
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182 #ifdef IS_PY3K |
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183 static struct PyModuleDef sha1dc_module = {PyModuleDef_HEAD_INIT, "sha1dc", |
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184 sha1dc_doc, -1, methods}; |
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185 |
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186 PyMODINIT_FUNC PyInit_sha1dc(void) |
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187 { |
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188 PyObject *mod = PyModule_Create(&sha1dc_module); |
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189 module_init(mod); |
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190 return mod; |
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191 } |
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192 #else |
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193 PyMODINIT_FUNC initsha1dc(void) |
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194 { |
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195 PyObject *mod = Py_InitModule3("sha1dc", methods, sha1dc_doc); |
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196 module_init(mod); |
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197 } |
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198 #endif |