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annotate libtomcrypt/demos/demo_dynamic.py @ 1933:e093ddc5b585

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Fix extra default -i arguments for multihop When multihop executes dbclient it should only add -i arguments from the original commandline, not the default id_dropbear key. Otherwise multiple -i arguments keep getting added which results in servers disconnecting with too many auth attempts
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 11:56:10 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2
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3 """
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4 demo_dynamic.py v2b
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5
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6 This program demonstrates Python's use of the dynamic
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7 language support additions to LTC, namely access to LTC
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8 constants, struct and union sizes, and the binding of a
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9 math package to LTC. Also provided are simple code
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10 fragments to illustrate how one might write a Python
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11 wrapper for LTC and how an app might call the wrapper.
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12 This or a similar model should work for Ruby and other
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13 dynamic languages.
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14
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15 This instance uses Python's ctypes and requires a single
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16 .dylib linking together LTC and a math library. Building
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17 a single .dylib is needed because LTC wants a fairly tight
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18 relationship between itself and the mathlib. (ctypes can
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19 load multiple .dylibs, but it does not support this level
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20 of tight coupling between otherwise independent libraries.)
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21
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22 My .dylib was created on OSX/macOS with the following:
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23 sudo make -j5 -f makefile.shared \
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24 CFLAGS="-DUSE_TFM -DTFM_DESC -I/usr/local/include" \
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25 EXTRALIBS=/usr/local/lib/libtfm.a install
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26
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27 For python 2.7.12 on Ubuntu Xenial the following worked for
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28 me (without MPI support):
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29 sudo make -f makefile.shared install PREFIX="/usr"
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30
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31 Reminder: you don't need to bind in a math library unless
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32 you are going to use LTC functions that need a
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33 mathlib. For example, public key crypto requires
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34 a mathlib; hashing and symmetric encryption do not.
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35
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36 ------
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37
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38 This code was originally written for Python 2.7 with the
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39 ctypes standard library. This version is modified to run
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40 under both Python 2.7 and 3.6.
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41
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42 Arguably the biggest change for Python3 has to do with
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43 strings. Under Python2, native strings are ASCII bytes and
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44 passing them to LTC is natural and requires no conversion.
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45 Under Python3 all native strings are Unicode which requires
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46 they be converted to bytes before use by LTC.
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47
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48 Note the following for Python3.
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49 - ASCII keys, IVs and other string arguments must be
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50 'bytes'. Define them with a 'b' prefix or convert
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51 via the 'bytes()' function.
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52 - "strings" returned from LTC are bytes and conversion
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53 to Unicode might be necessary for proper printing.
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54 If so, use <string>.decode('utf-8').
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55 - The Python2 'print' statement becomes a function in
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56 Python3 which requires parenthesis, eg. 'print()'.
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57
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58 NB: Unicode is achieved under Python2 by either defining
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59 a Unicode string with a 'u' prefix or passing ASCII
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60 strings thru the 'unicode()' function.
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61
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62 Larry Bugbee
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63 March 2014 v1
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64 August 2017 v2b
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65
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66 """
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67
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68
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69 import sys
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70 from ctypes import *
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71 from ctypes.util import find_library
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72
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73 # switches to enable/disable selected output
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74 SHOW_ALL_CONSTANTS = True
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75 SHOW_ALL_SIZES = True
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76 SHOW_SELECTED_CONSTANTS = True
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77 SHOW_SELECTED_SIZES = True
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78 SHOW_BUILD_OPTIONS_ALGS = True
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79 SHOW_SHA256_EXAMPLE = True
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80 SHOW_CHACHA_EXAMPLE = True
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81
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82 print(' ')
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83 print(' demo_dynamic.py')
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84
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85 def inprint(s, indent=0):
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86 "prints strings indented, including multline strings"
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87 for line in s.split('\n'):
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88 print(' '*indent + line)
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89
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90 #-------------------------------------------------------------------------------
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91 # load the .dylib
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92
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93 libname = 'tomcrypt'
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94 libpath = find_library(libname)
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95 print(' ')
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96 print(' path to library %s: %s' % (libname, libpath))
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97
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98 LTC = cdll.LoadLibrary(libpath)
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99 print(' loaded: %s' % LTC)
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100 print(' ')
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101
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102
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103 #-------------------------------------------------------------------------------
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104 # get list of all supported constants followed by a list of all
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105 # supported sizes. One alternative: these lists may be parsed
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106 # and used as needed.
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107
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108 if SHOW_ALL_CONSTANTS:
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109 print('-'*60)
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110 print(' all supported constants and their values:')
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111
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112 # get size to allocate for constants output list
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113 str_len = c_int(0)
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114 ret = LTC.crypt_list_all_constants(None, byref(str_len))
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115 print(' need to allocate %d bytes to build list \n' % str_len.value)
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116
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117 # allocate that size and get (name, size) pairs, each pair
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118 # separated by a newline char.
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119 names_sizes = c_buffer(str_len.value)
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120 ret = LTC.crypt_list_all_constants(names_sizes, byref(str_len))
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121 print(names_sizes.value.decode("utf-8"))
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122 print(' ')
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123
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124
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125 if SHOW_ALL_SIZES:
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126 print('-'*60)
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127 print(' all supported sizes:')
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128
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129 # get size to allocate for sizes output list
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130 str_len = c_int(0)
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131 ret = LTC.crypt_list_all_sizes(None, byref(str_len))
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132 print(' need to allocate %d bytes to build list \n' % str_len.value)
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133
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diff changeset
134 # allocate that size and get (name, size) pairs, each pair
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parents:
diff changeset
135 # separated by a newline char.
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
136 names_sizes = c_buffer(str_len.value)
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parents:
diff changeset
137 ret = LTC.crypt_list_all_sizes(names_sizes, byref(str_len))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
138 print(names_sizes.value.decode("utf-8"))
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parents:
diff changeset
139 print(' ')
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parents:
diff changeset
140
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
141
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
142 #-------------------------------------------------------------------------------
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parents:
diff changeset
143 # get individually named constants and sizes
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parents:
diff changeset
144
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diff changeset
145 if SHOW_SELECTED_CONSTANTS:
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parents:
diff changeset
146 print('-'*60)
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diff changeset
147 print('\n selected constants:')
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parents:
diff changeset
148
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diff changeset
149 names = [
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
150 b'ENDIAN_LITTLE',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
151 b'ENDIAN_64BITWORD',
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 b'PK_PUBLIC',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
153 b'LTC_MILLER_RABIN_REPS',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
154 b'CTR_COUNTER_BIG_ENDIAN',
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parents:
diff changeset
155 ]
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diff changeset
156 for name in names:
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diff changeset
157 const_value = c_int(0)
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parents:
diff changeset
158 rc = LTC.crypt_get_constant(name, byref(const_value))
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parents:
diff changeset
159 value = const_value.value
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diff changeset
160 print(' %-25s %d' % (name.decode("utf-8"), value))
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parents:
diff changeset
161 print(' ')
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parents:
diff changeset
162
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
163 if SHOW_SELECTED_SIZES:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
164 print('-'*60)
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parents:
diff changeset
165 print('\n selected sizes:')
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parents:
diff changeset
166
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diff changeset
167 names = [
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
168 b'rijndael_key',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
169 b'rsa_key',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 b'symmetric_CTR',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
171 b'twofish_key',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 b'ecc_point',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 b'gcm_state',
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 b'sha512_state',
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parents:
diff changeset
175 ]
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
176 for name in names:
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diff changeset
177 size_value = c_int(0)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
178 rc = LTC.crypt_get_size(name, byref(size_value))
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diff changeset
179 value = size_value.value
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diff changeset
180 print(' %-25s %d' % (name.decode("utf-8"), value))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
181 print(' ')
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parents:
diff changeset
182
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
183
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
184 #-------------------------------------------------------------------------------
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
185 #-------------------------------------------------------------------------------
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
186 # LibTomCrypt exposes one interesting string that can be accessed
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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187 # via Python's ctypes module, "crypt_build_settings", which
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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188 # provides a list of this build's compiler switches and supported
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
189 # algorithms. If someday LTC exposes other interesting strings,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
190 # they can be found with:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
191 # nm /usr/local/lib/libtomcrypt.dylib | grep " D "
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diff changeset
192
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
193 def get_named_string(lib, name):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
194 return c_char_p.in_dll(lib, name).value.decode("utf-8")
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
195
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
196 if SHOW_BUILD_OPTIONS_ALGS:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
197 print('-'*60)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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198 print('This is a string compiled into LTC showing compile')
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
199 print('options and algorithms supported by this build \n')
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diff changeset
200 # print(get_named_string(LTC, 'crypt_build_settings'))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 inprint(get_named_string(LTC, 'crypt_build_settings'), 4)
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diff changeset
202
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
203
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
204 #-------------------------------------------------------------------------------
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diff changeset
205 #-------------------------------------------------------------------------------
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diff changeset
206 # here is an example of how Python code can be written to access
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diff changeset
207 # LTC's implementation of SHA256 and ChaCha,
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parents:
diff changeset
208
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diff changeset
209 # - - - - - - - - - - - - -
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diff changeset
210 # definitions
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diff changeset
211
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diff changeset
212 from binascii import hexlify, unhexlify
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diff changeset
213
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
214 def _err2str(err):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 # define return type
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 errstr = LTC.error_to_string
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
217 errstr.restype = c_char_p
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parents:
diff changeset
218 # get and return err string
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 return errstr(err)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 def _get_size(name):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 size = c_int(0)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 rc = LTC.crypt_get_size(bytes(name), byref(size))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 if rc != 0:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 raise Exception('LTC.crypt_get_size(%s) rc = %d' % (name, rc))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 return size.value
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 def _get_constant(name):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 constant = c_int(0)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 rc = LTC.crypt_get_constant(bytes(name), byref(constant))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 if rc != 0:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 raise Exception('LTC.crypt_get_constant(%s) rc = %d' % (name, rc))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 return constant.value
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 CRYPT_OK = _get_constant(b'CRYPT_OK')
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 class SHA256(object):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 def __init__(self):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 self.state = c_buffer(_get_size(b'sha256_state'))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 LTC.sha256_init(byref(self.state))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 def update(self, data):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 LTC.sha256_process(byref(self.state), data, len(data))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 def digest(self):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 md = c_buffer(32)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 LTC.sha256_done(byref(self.state), byref(md))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 return md.raw
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 class ChaCha(object):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 def __init__(self, key, rounds):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 self.state = c_buffer(_get_size(b'chacha_state'))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 self.counter = c_int(1)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 err = LTC.chacha_setup(byref(self.state), key, len(key), rounds)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 if err != CRYPT_OK:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 raise Exception('LTC.chacha_setup(), err = %d, "%s"' % (err, _err2str(err)))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 def set_iv32(self, iv):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 err = LTC.chacha_ivctr32(byref(self.state), iv, len(iv), byref(self.counter))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 if err != CRYPT_OK:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 raise Exception('LTC.chacha_ivctr32(), err = %d, "%s"' % (err, _err2str(err)))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 def crypt(self, datain):
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 dataout = c_buffer(len(datain))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 err = LTC.chacha_crypt(byref(self.state), datain, len(datain), byref(dataout))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 if err != CRYPT_OK:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 raise Exception('LTC.chacha_crypt(), err = %d, "%s"' % (err, _err2str(err)))
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 return dataout.raw
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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266 # - - - - - - - - - - - - -
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267 # a SHA256 app fragment
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268
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269 if SHOW_SHA256_EXAMPLE:
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270 print('-'*60)
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271 data = b'hello world' # we want bytes, not Unicode
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272
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273 sha256 = SHA256()
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274 sha256.update(data)
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275 md = sha256.digest()
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276
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277 template = '\n the SHA256 digest for "%s" is %s \n'
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278 print(template % (data, hexlify(md)))
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279
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280 # - - - - - - - - - - - - -
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281 # a ChaCha app fragment
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282
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283 if SHOW_CHACHA_EXAMPLE:
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284 print('-'*60)
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285 key = b'hownowbrowncow\x00\x00' # exactly 16 or 32 bytes
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286 rounds = 12 # common values: 8, 12, 20
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287 iv = b'123456789012' # exactly 12 bytes
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288 plain = b'Kilroy was here, there, and everywhere!'
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289
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290 cha = ChaCha(key, rounds)
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291 cha.set_iv32(iv)
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292 cipher = cha.crypt(plain)
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293
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294 template = '\n ChaCha%d ciphertext for "%s" is "%s"'
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295 print(template % (rounds, plain, hexlify(cipher)))
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296
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297 cha.set_iv32(iv) # reset to decrypt
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298 decrypted = cha.crypt(cipher)
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299
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300 template = ' ChaCha%d decoded text for "%s" is "%s" \n'
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301 print(template % (rounds, plain, decrypted.decode("utf-8")))
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302
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303 # Footnote: Keys should be erased fm memory as soon as possible after use,
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304 # and that includes Python. For a tip on how to do that in Python, see
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305 # http://buggywhip.blogspot.com/2010/12/erase-keys-and-credit-card-numbers-in.html
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306
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307 #-------------------------------------------------------------------------------
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308 #-------------------------------------------------------------------------------
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309 #-------------------------------------------------------------------------------