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@@ -58,7 +58,8 @@ SHOW_CHACHA_EXAMPLE = True
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print
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print(' demo_dynamic.py')
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-#---------------------------------------------------------------
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+
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+#-------------------------------------------------------------------------------
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# load the .dylib
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libname = 'tomcrypt'
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@@ -71,8 +72,7 @@ print(' loaded: %s' % LTC)
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print
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-
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-#---------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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# get list of all supported constants followed by a list of all
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# supported sizes. One alternative: these lists may be parsed
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# and used as needed.
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@@ -84,7 +84,7 @@ if SHOW_ALL_CONSTANTS:
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# get size to allocate for constants output list
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str_len = c_int(0)
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ret = LTC.crypt_list_all_constants(None, byref(str_len))
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- print ' need to allocate %d bytes \n' % str_len.value
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+ print ' need to allocate %d bytes to build list \n' % str_len.value
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# allocate that size and get (name, size) pairs, each pair
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# separated by a newline char.
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@@ -101,7 +101,7 @@ if SHOW_ALL_SIZES:
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# get size to allocate for sizes output list
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str_len = c_int(0)
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ret = LTC.crypt_list_all_sizes(None, byref(str_len))
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- print ' need to allocate %d bytes \n' % str_len.value
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+ print ' need to allocate %d bytes to build list \n' % str_len.value
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# allocate that size and get (name, size) pairs, each pair
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# separated by a newline char.
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@@ -111,7 +111,7 @@ if SHOW_ALL_SIZES:
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print
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-#---------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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# get individually named constants and sizes
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# print selected constants
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@@ -131,6 +131,7 @@ if SHOW_SELECTED_CONSTANTS:
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rc = LTC.crypt_get_constant(name, byref(const_value))
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value = const_value.value
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print ' %-25s %d' % (name, value)
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+ print
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# print selected sizes
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if SHOW_SELECTED_SIZES:
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@@ -151,10 +152,11 @@ if SHOW_SELECTED_SIZES:
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rc = LTC.crypt_get_size(name, byref(size_value))
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value = size_value.value
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print ' %-25s %d' % (name, value)
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+ print
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-#---------------------------------------------------------------
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-#---------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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# LibTomCrypt exposes one interesting string that can be accessed
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# via Python's ctypes module, "crypt_build_settings", which
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# provides a list of this build's compiler switches and supported
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@@ -170,12 +172,10 @@ if SHOW_BUILD_OPTIONS_ALGS:
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print 'This is a string compiled into LTC showing compile '
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print 'options and algorithms supported by this build \n'
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print get_named_string(LTC, 'crypt_build_settings')
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- print
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-
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-#---------------------------------------------------------------
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-#---------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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# here is an example of how Python code can be written to access
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# LTC's implementation of SHA256 and ChaCha,
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@@ -235,7 +235,7 @@ class ChaCha(object):
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return dataout.raw
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# - - - - - - - - - - - - -
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-# a SHA256 app fragment...
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+# a SHA256 app fragment
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# from wrapper import * # uncomment in real life
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@@ -251,7 +251,7 @@ if SHOW_SHA256_EXAMPLE:
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print template % (data, md.encode('hex'))
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# - - - - - - - - - - - - -
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-# a ChaCha app fragment...
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+# a ChaCha app fragment
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if SHOW_CHACHA_EXAMPLE:
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print '-'*60
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@@ -274,8 +274,10 @@ if SHOW_CHACHA_EXAMPLE:
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template = ' ChaCha%d decoded text for "%s" is "%s" \n'
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print template % (rounds, plain, decrypted)
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+# Footnote: Keys should be erased fm memory as soon as possible after use,
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+# and that includes Python. For a tip on how to do that in Python, see
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+# http://buggywhip.blogspot.com/2010/12/erase-keys-and-credit-card-numbers-in.html
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-
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-#---------------------------------------------------------------
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-#---------------------------------------------------------------
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-#---------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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+#-------------------------------------------------------------------------------
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Larry Bugbee