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Merge pull request #1229 from triska/faster_decryption

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ENHANCED: library(crypto): Retain a compact internal representation of the ciphertext throughout decryption.
This commit is contained in:
Mark Thom
2022-01-17 17:03:29 -07:00
committed by GitHub
parent c6400550e1 516ed1fd5b
commit 6c8dc49216
1 changed files with 5 additions and 2 deletions
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7
src/lib/crypto.pl
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@@ -1,5 +1,5 @@
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Written 2020, 2021 by Markus Triska (triska@metalevel.at)
Written 2020, 2021, 2022 by Markus Triska (triska@metalevel.at)
Part of Scryer Prolog.
Predicates for cryptographic applications.
@@ -46,6 +46,7 @@
:- use_module(library(format)).
:- use_module(library(charsio)).
:- use_module(library(si)).
:- use_module(library(iso_ext), [partial_string/3]).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
hex_bytes(?Hex, ?Bytes) is det.
@@ -594,7 +595,9 @@ crypto_data_decrypt(CipherText0, Algorithm, Key, IV, PlainText, Options) :-
member(Encoding, [utf8,octet]),
encoding_chars(octet, CipherText0, CipherText1),
maplist(char_code, TagChars, Tag),
append(CipherText1, TagChars, CipherText),
% we append the tag very efficiently, retaining a compact
% internal string representation of the ciphertext
partial_string(CipherText1, CipherText, TagChars),
( Algorithm = 'chacha20-poly1305' -> true
; domain_error('chacha20-poly1305', Algorithm, crypto_data_decrypt/6)
),