/usr/lib/python2.7/dist-packages/scrypt.py is in python-scrypt 0.6.1-5.1+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | import imp
import os
import sys
from ctypes import (cdll,
POINTER, pointer,
c_char_p,
c_size_t, c_double, c_int, c_uint64, c_uint32,
create_string_buffer)
_scrypt = cdll.LoadLibrary(imp.find_module('_scrypt')[1])
_scryptenc_buf = _scrypt.exp_scryptenc_buf
_scryptenc_buf.argtypes = [c_char_p, # const uint_t *inbuf
c_size_t, # size_t inbuflen
c_char_p, # uint8_t *outbuf
c_char_p, # const uint8_t *passwd
c_size_t, # size_t passwdlen
c_size_t, # size_t maxmem
c_double, # double maxmemfrac
c_double, # double maxtime
]
_scryptenc_buf.restype = c_int
_scryptdec_buf = _scrypt.exp_scryptdec_buf
_scryptdec_buf.argtypes = [c_char_p, # const uint8_t *inbuf
c_size_t, # size_t inbuflen
c_char_p, # uint8_t *outbuf
POINTER(c_size_t), # size_t *outlen
c_char_p, # const uint8_t *passwd
c_size_t, # size_t passwdlen
c_size_t, # size_t maxmem
c_double, # double maxmemfrac
c_double, # double maxtime
]
_scryptdec_buf.restype = c_int
_crypto_scrypt = _scrypt.exp_crypto_scrypt
_crypto_scrypt.argtypes = [c_char_p, # const uint8_t *passwd
c_size_t, # size_t passwdlen
c_char_p, # const uint8_t *salt
c_size_t, # size_t saltlen
c_uint64, # uint64_t N
c_uint32, # uint32_t r
c_uint32, # uint32_t p
c_char_p, # uint8_t *buf
c_size_t, # size_t buflen
]
_crypto_scrypt.restype = c_int
ERROR_MESSAGES = ['success',
'getrlimit or sysctl(hw.usermem) failed',
'clock_getres or clock_gettime failed',
'error computing derived key',
'could not read salt from /dev/urandom',
'error in OpenSSL',
'malloc failed',
'data is not a valid scrypt-encrypted block',
'unrecognized scrypt format',
'decrypting file would take too much memory',
'decrypting file would take too long',
'password is incorrect',
'error writing output file',
'error reading input file']
MAXMEM_DEFAULT = 0
MAXMEMFRAC_DEFAULT = 0.5
MAXTIME_DEFAULT = 300.0
MAXTIME_DEFAULT_ENC = 5.0
IS_PY2 = sys.version_info < (3, 0, 0, 'final', 0)
class error(Exception):
def __init__(self, scrypt_code):
if isinstance(scrypt_code, int):
self._scrypt_code = scrypt_code
super(error, self).__init__(ERROR_MESSAGES[scrypt_code])
else:
self._scrypt_code = -1
super(error, self).__init__(scrypt_code)
def _ensure_bytes(data):
if IS_PY2 and isinstance(data, unicode):
raise TypeError('can not encrypt/decrypt unicode objects')
if not IS_PY2 and isinstance(data, str):
return bytes(data, 'utf-8')
return data
def encrypt(input, password,
maxtime=MAXTIME_DEFAULT_ENC,
maxmem=MAXMEM_DEFAULT,
maxmemfrac=MAXMEMFRAC_DEFAULT):
"""
Encrypt a string using a password. The resulting data will have len =
len(input) + 128.
Notes for Python 2:
- `input` and `password` must be str instances
- The result will be a str instance
Notes for Python 3:
- `input` and `password` can be both str and bytes. If they are str
instances, they will be encoded with utf-8
- The result will be a bytes instance
Exceptions raised:
- TypeError on invalid input
- scrypt.error if encryption failed
For more information on the `maxtime`, `maxmem`, and `maxmemfrac`
parameters, see the scrypt documentation.
"""
input = _ensure_bytes(input)
password = _ensure_bytes(password)
outbuf = create_string_buffer(len(input) + 128)
result = _scryptenc_buf(input, len(input),
outbuf,
password, len(password),
maxmem, maxmemfrac, maxtime)
if result:
raise error(result)
return outbuf.raw
def decrypt(input, password,
maxtime=MAXTIME_DEFAULT,
maxmem=MAXMEM_DEFAULT,
maxmemfrac=MAXMEMFRAC_DEFAULT,
encoding='utf-8'):
"""
Decrypt a string using a password.
Notes for Python 2:
- `input` and `password` must be str instances
- The result will be a str instance
- The encoding parameter is ignored
Notes for Python 3:
- `input` and `password` can be both str and bytes. If they are str
instances, they wil be encoded with utf-8. `input` *should*
really be a bytes instance, since that's what `encrypt` returns.
- The result will be a str instance encoded with `encoding`.
If encoding=None, the result will be a bytes instance.
Exceptions raised:
- TypeError on invalid input
- scrypt.error if decryption failed
For more information on the `maxtime`, `maxmem`, and `maxmemfrac`
parameters, see the scrypt documentation.
"""
outbuf = create_string_buffer(len(input))
outbuflen = pointer(c_size_t(0))
input = _ensure_bytes(input)
password = _ensure_bytes(password)
result = _scryptdec_buf(input, len(input),
outbuf, outbuflen,
password, len(password),
maxmem, maxmemfrac, maxtime)
if result:
raise error(result)
out_bytes = outbuf.raw[:outbuflen.contents.value]
if IS_PY2 or encoding is None:
return out_bytes
return str(out_bytes, encoding)
def hash(password, salt, N=1 << 14, r=8, p=1, buflen=64):
"""
Compute scrypt(password, salt, N, r, p, buflen).
The parameters r, p, and buflen must satisfy r * p < 2^30 and
buflen <= (2^32 - 1) * 32. The parameter N must be a power of 2
greater than 1. N, r and p must all be positive.
Notes for Python 2:
- `password` and `salt` must be str instances
- The result will be a str instance
Notes for Python 3:
- `password` and `salt` can be both str and bytes. If they are str
instances, they wil be encoded with utf-8.
- The result will be a bytes instance
Exceptions raised:
- TypeError on invalid input
- scrypt.error if scrypt failed
"""
outbuf = create_string_buffer(buflen)
password = _ensure_bytes(password)
salt = _ensure_bytes(salt)
if r * p >= (1 << 30) or N <= 1 or (N & (N - 1)) != 0 or p < 1 or r < 1:
raise error('hash parameters are wrong (r*p should be < 2**30, and N should be a power of two > 1)')
result = _crypto_scrypt(password, len(password),
salt, len(salt),
N, r, p,
outbuf, buflen)
if result:
raise error('could not compute hash')
return outbuf.raw
__all__ = ['error', 'encrypt', 'decrypt', 'hash']
|