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Use subarray() instead of slice() for performance

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This commit is contained in:
Kovid Goyal 2016-03-22 08:22:48 +05:30
parent e7cdb2b3dc
commit 4bee4a6e83
1 changed files with 6 additions and 4 deletions
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10
src/pyj/aes.pyj
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@ -1,6 +1,8 @@
# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
# globals: crypto
# Internal API {{{
def string_to_bytes_encoder(string):
@ -23,7 +25,7 @@ def as_hex(bytes):
def bytes_to_string_decoder(bytes, offset):
offset = offset or 0
if offset:
bytes = bytes.slice(offset)
bytes = bytes.subarray(offset)
return TextDecoder('utf-8').decode(bytes)
def bytes_to_string_slow(bytes, offset):
@ -214,10 +216,10 @@ def random_bytes_insecure(sz):
def random_bytes_secure(sz):
ans = Uint8Array(sz)
window.crypto.getRandomValues(ans)
crypto.getRandomValues(ans)
return ans
random_bytes = random_bytes_secure if type(window) is not 'undefined' and window.crypto and type(window.crypto.getRandomValues) is 'function' else random_bytes_insecure
random_bytes = random_bytes_secure if type(crypto) is not 'undefined' and type(crypto.getRandomValues) is 'function' else random_bytes_insecure
if random_bytes is random_bytes_insecure:
print('WARNING: Using insecure RNG for AES')
# }}}
@ -302,7 +304,7 @@ class CBC(ModeOfOperation):
raise ValueError('Corrupt message')
mlen = outputbytes.length - 1 - padsz - tag_bytes.length
mstart = 1 + tag_bytes.length
outputbytes = outputbytes.slice(mstart, mstart + mlen)
outputbytes = outputbytes.subarray(mstart, mstart + mlen)
return bytes_to_string(outputbytes)
class Counter: