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LibCrypto: Add ChaCha20
This commit is contained in:
parent
5397278bfc
commit
7bd0ebb1ab
Notes:
sideshowbarker
2024-07-17 11:51:19 +09:00
Author: https://github.com/stelar7 Commit: https://github.com/SerenityOS/serenity/commit/7bd0ebb1ab Pull-request: https://github.com/SerenityOS/serenity/pull/13602 Reviewed-by: https://github.com/ADKaster Reviewed-by: https://github.com/IdanHo Reviewed-by: https://github.com/alimpfard
@ -2,6 +2,7 @@ set(TEST_SOURCES
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TestAES.cpp
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TestBigInteger.cpp
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TestChecksum.cpp
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TestChaCha20.cpp
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TestCurves.cpp
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TestHash.cpp
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TestHMAC.cpp
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141
Tests/LibCrypto/TestChaCha20.cpp
Normal file
141
Tests/LibCrypto/TestChaCha20.cpp
Normal file
@ -0,0 +1,141 @@
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/*
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* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteBuffer.h>
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#include <LibCrypto/Cipher/ChaCha20.h>
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#include <LibTest/TestCase.h>
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// https://datatracker.ietf.org/doc/html/rfc7539#appendix-A.2
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TEST_CASE(test_vector_1)
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{
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u8 key[32] = {};
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u8 nonce[12] = {};
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u32 initial_block_counter = {};
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u8 plaintext[64] = {};
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u8 ciphertext[64] {
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0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90, 0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
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0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a, 0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
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0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d, 0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
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0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c, 0xc3, 0x87, 0xb6, 0x69, 0xb2, 0xee, 0x65, 0x86
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};
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auto result = MUST(ByteBuffer::create_uninitialized(64));
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auto output = result.bytes();
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Crypto::Cipher::ChaCha20 cipher(ReadonlyBytes { key, 32 }, ReadonlyBytes { nonce, 12 }, initial_block_counter);
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cipher.encrypt(ReadonlyBytes { plaintext, 64 }, output);
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auto expected = ReadonlyBytes { ciphertext, 64 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_2)
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{
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u8 key[32] {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
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};
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u8 nonce[12] {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2
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};
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u32 initial_block_counter { 1 };
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u8 plaintext[375] {
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0x41, 0x6e, 0x79, 0x20, 0x73, 0x75, 0x62, 0x6d, 0x69, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x74,
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0x6f, 0x20, 0x74, 0x68, 0x65, 0x20, 0x49, 0x45, 0x54, 0x46, 0x20, 0x69, 0x6e, 0x74, 0x65, 0x6e,
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0x64, 0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x74, 0x68, 0x65, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x72,
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0x69, 0x62, 0x75, 0x74, 0x6f, 0x72, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x70, 0x75, 0x62, 0x6c, 0x69,
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0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x61, 0x73, 0x20, 0x61, 0x6c, 0x6c, 0x20, 0x6f, 0x72,
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0x20, 0x70, 0x61, 0x72, 0x74, 0x20, 0x6f, 0x66, 0x20, 0x61, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46,
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0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74, 0x20,
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0x6f, 0x72, 0x20, 0x52, 0x46, 0x43, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x73,
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0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x77, 0x69,
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0x74, 0x68, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78, 0x74,
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0x20, 0x6f, 0x66, 0x20, 0x61, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46, 0x20, 0x61, 0x63, 0x74, 0x69,
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0x76, 0x69, 0x74, 0x79, 0x20, 0x69, 0x73, 0x20, 0x63, 0x6f, 0x6e, 0x73, 0x69, 0x64, 0x65, 0x72,
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0x65, 0x64, 0x20, 0x61, 0x6e, 0x20, 0x22, 0x49, 0x45, 0x54, 0x46, 0x20, 0x43, 0x6f, 0x6e, 0x74,
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0x72, 0x69, 0x62, 0x75, 0x74, 0x69, 0x6f, 0x6e, 0x22, 0x2e, 0x20, 0x53, 0x75, 0x63, 0x68, 0x20,
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0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x69, 0x6e, 0x63, 0x6c, 0x75,
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0x64, 0x65, 0x20, 0x6f, 0x72, 0x61, 0x6c, 0x20, 0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e,
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0x74, 0x73, 0x20, 0x69, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46, 0x20, 0x73, 0x65, 0x73, 0x73, 0x69,
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0x6f, 0x6e, 0x73, 0x2c, 0x20, 0x61, 0x73, 0x20, 0x77, 0x65, 0x6c, 0x6c, 0x20, 0x61, 0x73, 0x20,
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0x77, 0x72, 0x69, 0x74, 0x74, 0x65, 0x6e, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x65, 0x6c, 0x65, 0x63,
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0x74, 0x72, 0x6f, 0x6e, 0x69, 0x63, 0x20, 0x63, 0x6f, 0x6d, 0x6d, 0x75, 0x6e, 0x69, 0x63, 0x61,
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0x74, 0x69, 0x6f, 0x6e, 0x73, 0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e,
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0x79, 0x20, 0x74, 0x69, 0x6d, 0x65, 0x20, 0x6f, 0x72, 0x20, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x2c,
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0x20, 0x77, 0x68, 0x69, 0x63, 0x68, 0x20, 0x61, 0x72, 0x65, 0x20, 0x61, 0x64, 0x64, 0x72, 0x65,
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0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
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};
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u8 ciphertext[375] {
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0xa3, 0xfb, 0xf0, 0x7d, 0xf3, 0xfa, 0x2f, 0xde, 0x4f, 0x37, 0x6c, 0xa2, 0x3e, 0x82, 0x73, 0x70,
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0x41, 0x60, 0x5d, 0x9f, 0x4f, 0x4f, 0x57, 0xbd, 0x8c, 0xff, 0x2c, 0x1d, 0x4b, 0x79, 0x55, 0xec,
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0x2a, 0x97, 0x94, 0x8b, 0xd3, 0x72, 0x29, 0x15, 0xc8, 0xf3, 0xd3, 0x37, 0xf7, 0xd3, 0x70, 0x05,
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0x0e, 0x9e, 0x96, 0xd6, 0x47, 0xb7, 0xc3, 0x9f, 0x56, 0xe0, 0x31, 0xca, 0x5e, 0xb6, 0x25, 0x0d,
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0x40, 0x42, 0xe0, 0x27, 0x85, 0xec, 0xec, 0xfa, 0x4b, 0x4b, 0xb5, 0xe8, 0xea, 0xd0, 0x44, 0x0e,
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0x20, 0xb6, 0xe8, 0xdb, 0x09, 0xd8, 0x81, 0xa7, 0xc6, 0x13, 0x2f, 0x42, 0x0e, 0x52, 0x79, 0x50,
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0x42, 0xbd, 0xfa, 0x77, 0x73, 0xd8, 0xa9, 0x05, 0x14, 0x47, 0xb3, 0x29, 0x1c, 0xe1, 0x41, 0x1c,
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0x68, 0x04, 0x65, 0x55, 0x2a, 0xa6, 0xc4, 0x05, 0xb7, 0x76, 0x4d, 0x5e, 0x87, 0xbe, 0xa8, 0x5a,
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0xd0, 0x0f, 0x84, 0x49, 0xed, 0x8f, 0x72, 0xd0, 0xd6, 0x62, 0xab, 0x05, 0x26, 0x91, 0xca, 0x66,
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0x42, 0x4b, 0xc8, 0x6d, 0x2d, 0xf8, 0x0e, 0xa4, 0x1f, 0x43, 0xab, 0xf9, 0x37, 0xd3, 0x25, 0x9d,
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0xc4, 0xb2, 0xd0, 0xdf, 0xb4, 0x8a, 0x6c, 0x91, 0x39, 0xdd, 0xd7, 0xf7, 0x69, 0x66, 0xe9, 0x28,
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0xe6, 0x35, 0x55, 0x3b, 0xa7, 0x6c, 0x5c, 0x87, 0x9d, 0x7b, 0x35, 0xd4, 0x9e, 0xb2, 0xe6, 0x2b,
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0x08, 0x71, 0xcd, 0xac, 0x63, 0x89, 0x39, 0xe2, 0x5e, 0x8a, 0x1e, 0x0e, 0xf9, 0xd5, 0x28, 0x0f,
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0xa8, 0xca, 0x32, 0x8b, 0x35, 0x1c, 0x3c, 0x76, 0x59, 0x89, 0xcb, 0xcf, 0x3d, 0xaa, 0x8b, 0x6c,
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0xcc, 0x3a, 0xaf, 0x9f, 0x39, 0x79, 0xc9, 0x2b, 0x37, 0x20, 0xfc, 0x88, 0xdc, 0x95, 0xed, 0x84,
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0xa1, 0xbe, 0x05, 0x9c, 0x64, 0x99, 0xb9, 0xfd, 0xa2, 0x36, 0xe7, 0xe8, 0x18, 0xb0, 0x4b, 0x0b,
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0xc3, 0x9c, 0x1e, 0x87, 0x6b, 0x19, 0x3b, 0xfe, 0x55, 0x69, 0x75, 0x3f, 0x88, 0x12, 0x8c, 0xc0,
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0x8a, 0xaa, 0x9b, 0x63, 0xd1, 0xa1, 0x6f, 0x80, 0xef, 0x25, 0x54, 0xd7, 0x18, 0x9c, 0x41, 0x1f,
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0x58, 0x69, 0xca, 0x52, 0xc5, 0xb8, 0x3f, 0xa3, 0x6f, 0xf2, 0x16, 0xb9, 0xc1, 0xd3, 0x00, 0x62,
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0xbe, 0xbc, 0xfd, 0x2d, 0xc5, 0xbc, 0xe0, 0x91, 0x19, 0x34, 0xfd, 0xa7, 0x9a, 0x86, 0xf6, 0xe6,
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0x98, 0xce, 0xd7, 0x59, 0xc3, 0xff, 0x9b, 0x64, 0x77, 0x33, 0x8f, 0x3d, 0xa4, 0xf9, 0xcd, 0x85,
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0x14, 0xea, 0x99, 0x82, 0xcc, 0xaf, 0xb3, 0x41, 0xb2, 0x38, 0x4d, 0xd9, 0x02, 0xf3, 0xd1, 0xab,
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0x7a, 0xc6, 0x1d, 0xd2, 0x9c, 0x6f, 0x21, 0xba, 0x5b, 0x86, 0x2f, 0x37, 0x30, 0xe3, 0x7c, 0xfd,
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0xc4, 0xfd, 0x80, 0x6c, 0x22, 0xf2, 0x21
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};
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auto result = MUST(ByteBuffer::create_uninitialized(375));
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auto output = result.bytes();
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Crypto::Cipher::ChaCha20 cipher(ReadonlyBytes { key, 32 }, ReadonlyBytes { nonce, 12 }, initial_block_counter);
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cipher.encrypt(ReadonlyBytes { plaintext, 375 }, output);
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auto expected = ReadonlyBytes { ciphertext, 375 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_3)
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{
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u8 key[32] {
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0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
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0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0
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};
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u8 nonce[12] {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2
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};
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u32 initial_block_counter { 42 };
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u8 plaintext[127] {
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0x27, 0x54, 0x77, 0x61, 0x73, 0x20, 0x62, 0x72, 0x69, 0x6c, 0x6c, 0x69, 0x67, 0x2c, 0x20, 0x61,
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0x6e, 0x64, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x6c, 0x69, 0x74, 0x68, 0x79, 0x20, 0x74, 0x6f,
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0x76, 0x65, 0x73, 0x0a, 0x44, 0x69, 0x64, 0x20, 0x67, 0x79, 0x72, 0x65, 0x20, 0x61, 0x6e, 0x64,
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0x20, 0x67, 0x69, 0x6d, 0x62, 0x6c, 0x65, 0x20, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x77,
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0x61, 0x62, 0x65, 0x3a, 0x0a, 0x41, 0x6c, 0x6c, 0x20, 0x6d, 0x69, 0x6d, 0x73, 0x79, 0x20, 0x77,
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0x65, 0x72, 0x65, 0x20, 0x74, 0x68, 0x65, 0x20, 0x62, 0x6f, 0x72, 0x6f, 0x67, 0x6f, 0x76, 0x65,
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0x73, 0x2c, 0x0a, 0x41, 0x6e, 0x64, 0x20, 0x74, 0x68, 0x65, 0x20, 0x6d, 0x6f, 0x6d, 0x65, 0x20,
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0x72, 0x61, 0x74, 0x68, 0x73, 0x20, 0x6f, 0x75, 0x74, 0x67, 0x72, 0x61, 0x62, 0x65, 0x2e
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};
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u8 ciphertext[127] {
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0x62, 0xe6, 0x34, 0x7f, 0x95, 0xed, 0x87, 0xa4, 0x5f, 0xfa, 0xe7, 0x42, 0x6f, 0x27, 0xa1, 0xdf,
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0x5f, 0xb6, 0x91, 0x10, 0x04, 0x4c, 0x0d, 0x73, 0x11, 0x8e, 0xff, 0xa9, 0x5b, 0x01, 0xe5, 0xcf,
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0x16, 0x6d, 0x3d, 0xf2, 0xd7, 0x21, 0xca, 0xf9, 0xb2, 0x1e, 0x5f, 0xb1, 0x4c, 0x61, 0x68, 0x71,
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0xfd, 0x84, 0xc5, 0x4f, 0x9d, 0x65, 0xb2, 0x83, 0x19, 0x6c, 0x7f, 0xe4, 0xf6, 0x05, 0x53, 0xeb,
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0xf3, 0x9c, 0x64, 0x02, 0xc4, 0x22, 0x34, 0xe3, 0x2a, 0x35, 0x6b, 0x3e, 0x76, 0x43, 0x12, 0xa6,
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0x1a, 0x55, 0x32, 0x05, 0x57, 0x16, 0xea, 0xd6, 0x96, 0x25, 0x68, 0xf8, 0x7d, 0x3f, 0x3f, 0x77,
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0x04, 0xc6, 0xa8, 0xd1, 0xbc, 0xd1, 0xbf, 0x4d, 0x50, 0xd6, 0x15, 0x4b, 0x6d, 0xa7, 0x31, 0xb1,
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0x87, 0xb5, 0x8d, 0xfd, 0x72, 0x8a, 0xfa, 0x36, 0x75, 0x7a, 0x79, 0x7a, 0xc1, 0x88, 0xd1
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};
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auto result = MUST(ByteBuffer::create_uninitialized(127));
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auto output = result.bytes();
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Crypto::Cipher::ChaCha20 cipher(ReadonlyBytes { key, 32 }, ReadonlyBytes { nonce, 12 }, initial_block_counter);
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cipher.encrypt(ReadonlyBytes { plaintext, 127 }, output);
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auto expected = ReadonlyBytes { ciphertext, 127 };
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EXPECT_EQ(result, expected);
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}
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@ -18,6 +18,7 @@ set(SOURCES
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Checksum/Adler32.cpp
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Checksum/CRC32.cpp
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Cipher/AES.cpp
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Cipher/ChaCha20.cpp
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Curves/SECP256r1.cpp
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Curves/X25519.cpp
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Curves/X448.cpp
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160
Userland/Libraries/LibCrypto/Cipher/ChaCha20.cpp
Normal file
160
Userland/Libraries/LibCrypto/Cipher/ChaCha20.cpp
Normal file
@ -0,0 +1,160 @@
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/*
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* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteReader.h>
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#include <AK/Endian.h>
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#include <LibCrypto/Cipher/ChaCha20.h>
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namespace Crypto::Cipher {
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ChaCha20::ChaCha20(ReadonlyBytes key, ReadonlyBytes nonce, u32 initial_counter)
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{
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VERIFY(key.size() == 16 || key.size() == 32);
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VERIFY(nonce.size() == 8 || nonce.size() == 12);
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// The first four words (0-3) are constants
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if (key.size() == 32) {
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m_state[0] = CONSTANT_32_BYTES[0];
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m_state[1] = CONSTANT_32_BYTES[1];
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m_state[2] = CONSTANT_32_BYTES[2];
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m_state[3] = CONSTANT_32_BYTES[3];
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} else {
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m_state[0] = CONSTANT_16_BYTES[0];
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m_state[1] = CONSTANT_16_BYTES[1];
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m_state[2] = CONSTANT_16_BYTES[2];
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m_state[3] = CONSTANT_16_BYTES[3];
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}
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// The next eight words (4-11) are taken from the key by reading the bytes in little-endian order, in 4-byte chunks.
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for (u32 i = 0; i < 16; i += 4) {
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m_state[(i / 4) + 4] = AK::convert_between_host_and_little_endian(ByteReader::load32(key.offset(i)));
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}
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// NOTE: For the 128-bit keys we read the same bytes twice to fill the state
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u32 key_offset = key.size() == 32 ? 16 : 0;
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for (u32 i = 0; i < 16; i += 4) {
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m_state[(i / 4) + 8] = AK::convert_between_host_and_little_endian(ByteReader::load32(key.offset(key_offset + i)));
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}
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// Word 12 is a block counter. Since each block is 64-bytes, a 32-bit word is enough for 256 gigabytes of data.
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m_state[12] = initial_counter;
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// Words 13-15 are a nonce, which should not be repeated for the same key.
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// The 13th word is the first 32 bits of the input nonce taken as a little-endian integer,
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// while the 15th word is the last 32 bits.
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|
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// NOTE: In the case of an 8-byte nonce, we skip the 13th word
|
||||
u32 nonce_offset = nonce.size() == 8 ? 1 : 0;
|
||||
for (u32 i = 0; i < 12; i += 4) {
|
||||
m_state[(i / 4) + 13 + nonce_offset] = AK::convert_between_host_and_little_endian(ByteReader::load32(nonce.offset(i)));
|
||||
}
|
||||
}
|
||||
|
||||
// https://datatracker.ietf.org/doc/html/rfc7539#section-2.3
|
||||
void ChaCha20::generate_block()
|
||||
{
|
||||
// Copy the current state into the block
|
||||
memcpy(m_block, m_state, 16 * sizeof(u32));
|
||||
|
||||
// ChaCha20 runs 20 rounds, alternating between "column rounds" and "diagonal rounds".
|
||||
// Each round consists of four quarter-rounds
|
||||
for (u32 i = 0; i < 20; i += 2) {
|
||||
// Column rounds
|
||||
do_quarter_round(m_block[0], m_block[4], m_block[8], m_block[12]);
|
||||
do_quarter_round(m_block[1], m_block[5], m_block[9], m_block[13]);
|
||||
do_quarter_round(m_block[2], m_block[6], m_block[10], m_block[14]);
|
||||
do_quarter_round(m_block[3], m_block[7], m_block[11], m_block[15]);
|
||||
|
||||
// Diagonal rounds
|
||||
do_quarter_round(m_block[0], m_block[5], m_block[10], m_block[15]);
|
||||
do_quarter_round(m_block[1], m_block[6], m_block[11], m_block[12]);
|
||||
do_quarter_round(m_block[2], m_block[7], m_block[8], m_block[13]);
|
||||
do_quarter_round(m_block[3], m_block[4], m_block[9], m_block[14]);
|
||||
}
|
||||
|
||||
// At the end of 20 rounds, we add the original input words to the output words,
|
||||
for (u32 i = 0; i < 16; i++) {
|
||||
m_block[i] += m_state[i];
|
||||
}
|
||||
|
||||
// and serialize the result by sequencing the words one-by-one in little-endian order.
|
||||
for (u32 i = 0; i < 16; i++) {
|
||||
m_block[i] = AK::convert_between_host_and_little_endian(m_block[i]);
|
||||
}
|
||||
}
|
||||
|
||||
ALWAYS_INLINE static void rotl(u32& x, u32 n)
|
||||
{
|
||||
x = (x << n) | (x >> (32 - n));
|
||||
}
|
||||
|
||||
// https://datatracker.ietf.org/doc/html/rfc8439#section-2.1
|
||||
void ChaCha20::do_quarter_round(u32& a, u32& b, u32& c, u32& d)
|
||||
{
|
||||
a += b;
|
||||
d ^= a;
|
||||
rotl(d, 16);
|
||||
|
||||
c += d;
|
||||
b ^= c;
|
||||
rotl(b, 12);
|
||||
|
||||
a += b;
|
||||
d ^= a;
|
||||
rotl(d, 8);
|
||||
|
||||
c += d;
|
||||
b ^= c;
|
||||
rotl(b, 7);
|
||||
}
|
||||
|
||||
void ChaCha20::run_cipher(ReadonlyBytes input, Bytes& output)
|
||||
{
|
||||
size_t offset = 0;
|
||||
size_t block_offset = 0;
|
||||
while (offset < input.size()) {
|
||||
if (block_offset == 0 || block_offset >= 64) {
|
||||
// Generate a new XOR block
|
||||
generate_block();
|
||||
|
||||
// Increment the block counter, and carry over to block 13
|
||||
m_state[12]++;
|
||||
if (m_state[12] == 0) {
|
||||
m_state[13]++;
|
||||
}
|
||||
|
||||
block_offset = 0;
|
||||
}
|
||||
|
||||
// XOR the input and the current block
|
||||
u32 n = min(input.size() - offset, 64 - block_offset);
|
||||
u8* key_block = (u8*)m_block + block_offset;
|
||||
for (u32 i = 0; i < n; i++) {
|
||||
u8 input_byte = input.offset_pointer(offset)[i];
|
||||
u8 key_byte = key_block[i];
|
||||
u8 output_byte = input_byte ^ key_byte;
|
||||
|
||||
ByteReader::store(output.offset_pointer(offset + i), output_byte);
|
||||
}
|
||||
|
||||
offset += n;
|
||||
block_offset += n;
|
||||
}
|
||||
}
|
||||
|
||||
void ChaCha20::encrypt(ReadonlyBytes input, Bytes& output)
|
||||
{
|
||||
VERIFY(input.size() <= output.size());
|
||||
this->run_cipher(input, output);
|
||||
}
|
||||
|
||||
void ChaCha20::decrypt(ReadonlyBytes input, Bytes& output)
|
||||
{
|
||||
VERIFY(input.size() <= output.size());
|
||||
this->run_cipher(input, output);
|
||||
}
|
||||
|
||||
}
|
31
Userland/Libraries/LibCrypto/Cipher/ChaCha20.h
Normal file
31
Userland/Libraries/LibCrypto/Cipher/ChaCha20.h
Normal file
@ -0,0 +1,31 @@
|
||||
/*
|
||||
* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/ByteBuffer.h>
|
||||
|
||||
namespace Crypto::Cipher {
|
||||
|
||||
class ChaCha20 {
|
||||
static constexpr u32 CONSTANT_16_BYTES[] { 0x61707865, 0x3120646E, 0x79622D36, 0x6B206574 };
|
||||
static constexpr u32 CONSTANT_32_BYTES[] { 0x61707865, 0x3320646E, 0x79622D32, 0x6B206574 };
|
||||
|
||||
public:
|
||||
ChaCha20(ReadonlyBytes key, ReadonlyBytes nonce, u32 initial_counter = 0);
|
||||
|
||||
void encrypt(ReadonlyBytes input, Bytes& output);
|
||||
void decrypt(ReadonlyBytes input, Bytes& output);
|
||||
|
||||
private:
|
||||
void run_cipher(ReadonlyBytes input, Bytes& output);
|
||||
void generate_block();
|
||||
ALWAYS_INLINE void do_quarter_round(u32& a, u32& b, u32& c, u32& d);
|
||||
|
||||
u32 m_state[16] {};
|
||||
u32 m_block[16] {};
|
||||
};
|
||||
}
|
Loading…
Reference in New Issue
Block a user