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LibCrypto: Add Poly1305
This commit is contained in:
stelar7
Ali Mohammad Pur
parent
e109b967a1
commit
c237991222
Notes:
sideshowbarker
2024-07-17 14:16:58 +09:00
Author: https://github.com/stelar7 Commit: https://github.com/SerenityOS/serenity/commit/c237991222 Pull-request: https://github.com/SerenityOS/serenity/pull/13549 Reviewed-by: https://github.com/alimpfard
5 changed files with 567 additions and 0 deletions
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@ -5,6 +5,7 @@ set(TEST_SOURCES
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TestCurves.cpp
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TestHash.cpp
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TestHMAC.cpp
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TestPoly1305.cpp
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TestRSA.cpp
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)
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305
Tests/LibCrypto/TestPoly1305.cpp
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305
Tests/LibCrypto/TestPoly1305.cpp
Normal file
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@ -0,0 +1,305 @@
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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/Authentication/Poly1305.h>
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#include <LibTest/TestCase.h>
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// https://datatracker.ietf.org/doc/html/rfc8439#appendix-A.3
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TEST_CASE(test_vector_1)
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{
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u8 key[32] { 0 };
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u8 message[64] { 0 };
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u8 expected_result[16] { 0 };
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 64 });
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auto result = MUST(mac.digest());
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EXPECT(memcmp(result.data(), expected_result, 16) == 0);
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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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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70, 0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e
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};
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u8 message[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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0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
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};
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u8 expected_result[16] {
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0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70, 0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 375 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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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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0x36, 0xe5, 0xf6, 0xb5, 0xc5, 0xe0, 0x60, 0x70, 0xf0, 0xef, 0xca, 0x96, 0x22, 0x7a, 0x86, 0x3e,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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u8 message[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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0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
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};
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u8 expected_result[16] {
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0xf3, 0x47, 0x7e, 0x7c, 0xd9, 0x54, 0x17, 0xaf, 0x89, 0xa6, 0xb8, 0x79, 0x4c, 0x31, 0x0c, 0xf0
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 375 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_4)
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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 message[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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0x76, 0x65, 0x73, 0x0a, 0x44, 0x69, 0x64, 0x20, 0x67, 0x79, 0x72, 0x65, 0x20, 0x61, 0x6e, 0x64,
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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 expected_result[16] {
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0x45, 0x41, 0x66, 0x9a, 0x7e, 0xaa, 0xee, 0x61, 0xe7, 0x08, 0xdc, 0x7c, 0xbc, 0xc5, 0xeb, 0x62
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 127 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_5)
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{
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u8 key[32] {
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0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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u8 message[16] {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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u8 expected_result[16] {
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0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 16 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_6)
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{
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u8 key[32] {
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0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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u8 message[16] {
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0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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u8 expected_result[16] {
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0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 16 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_7)
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{
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u8 key[32] {
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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u8 message[48] {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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u8 expected_result[16] {
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0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
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mac.update(ReadonlyBytes { message, 48 });
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auto result = MUST(mac.digest());
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auto expected = ReadonlyBytes { expected_result, 16 };
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EXPECT_EQ(result, expected);
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}
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TEST_CASE(test_vector_8)
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{
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u8 key[32] {
|
||||
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 message[48] {
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
||||
0xFB, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
|
||||
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
|
||||
};
|
||||
|
||||
u8 expected_result[16] {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
|
||||
mac.update(ReadonlyBytes { message, 48 });
|
||||
auto result = MUST(mac.digest());
|
||||
auto expected = ReadonlyBytes { expected_result, 16 };
|
||||
EXPECT_EQ(result, expected);
|
||||
}
|
||||
|
||||
TEST_CASE(test_vector_9)
|
||||
{
|
||||
u8 key[32] {
|
||||
0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 message[16] {
|
||||
0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
|
||||
};
|
||||
|
||||
u8 expected_result[16] {
|
||||
0xFA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
|
||||
};
|
||||
|
||||
Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
|
||||
mac.update(ReadonlyBytes { message, 16 });
|
||||
auto result = MUST(mac.digest());
|
||||
auto expected = ReadonlyBytes { expected_result, 16 };
|
||||
EXPECT_EQ(result, expected);
|
||||
}
|
||||
|
||||
TEST_CASE(test_vector_10)
|
||||
{
|
||||
u8 key[32] {
|
||||
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 message[64] {
|
||||
0xE3, 0x35, 0x94, 0xD7, 0x50, 0x5E, 0x43, 0xB9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x33, 0x94, 0xD7, 0x50, 0x5E, 0x43, 0x79, 0xCD, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 expected_result[16] {
|
||||
0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
|
||||
mac.update(ReadonlyBytes { message, 64 });
|
||||
auto result = MUST(mac.digest());
|
||||
auto expected = ReadonlyBytes { expected_result, 16 };
|
||||
EXPECT_EQ(result, expected);
|
||||
}
|
||||
|
||||
TEST_CASE(test_vector_11)
|
||||
{
|
||||
u8 key[32] {
|
||||
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 message[48] {
|
||||
0xE3, 0x35, 0x94, 0xD7, 0x50, 0x5E, 0x43, 0xB9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x33, 0x94, 0xD7, 0x50, 0x5E, 0x43, 0x79, 0xCD, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
u8 expected_result[16] {
|
||||
0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
|
||||
Crypto::Authentication::Poly1305 mac(ReadonlyBytes { key, 32 });
|
||||
mac.update(ReadonlyBytes { message, 48 });
|
||||
auto result = MUST(mac.digest());
|
||||
auto expected = ReadonlyBytes { expected_result, 16 };
|
||||
EXPECT_EQ(result, expected);
|
||||
}
|
||||
226
Userland/Libraries/LibCrypto/Authentication/Poly1305.cpp
Normal file
226
Userland/Libraries/LibCrypto/Authentication/Poly1305.cpp
Normal file
|
|
@ -0,0 +1,226 @@
|
|||
/*
|
||||
* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include <AK/ByteReader.h>
|
||||
#include <AK/Endian.h>
|
||||
#include <LibCrypto/Authentication/Poly1305.h>
|
||||
|
||||
namespace Crypto::Authentication {
|
||||
|
||||
Poly1305::Poly1305(ReadonlyBytes key)
|
||||
{
|
||||
for (size_t i = 0; i < 16; i += 4) {
|
||||
m_state.r[i / 4] = AK::convert_between_host_and_little_endian(ByteReader::load32(key.offset(i)));
|
||||
}
|
||||
|
||||
// r[3], r[7], r[11], and r[15] are required to have their top four bits clear (be smaller than 16)
|
||||
// r[4], r[8], and r[12] are required to have their bottom two bits clear (be divisible by 4)
|
||||
m_state.r[0] &= 0x0FFFFFFF;
|
||||
m_state.r[1] &= 0x0FFFFFFC;
|
||||
m_state.r[2] &= 0x0FFFFFFC;
|
||||
m_state.r[3] &= 0x0FFFFFFC;
|
||||
|
||||
for (size_t i = 16; i < 32; i += 4) {
|
||||
m_state.s[(i - 16) / 4] = AK::convert_between_host_and_little_endian(ByteReader::load32(key.offset(i)));
|
||||
}
|
||||
}
|
||||
|
||||
void Poly1305::update(ReadonlyBytes message)
|
||||
{
|
||||
size_t offset = 0;
|
||||
while (offset < message.size()) {
|
||||
u32 n = min(message.size() - offset, 16 - m_state.block_count);
|
||||
memcpy(m_state.blocks + m_state.block_count, message.offset_pointer(offset), n);
|
||||
m_state.block_count += n;
|
||||
offset += n;
|
||||
|
||||
if (m_state.block_count == 16) {
|
||||
process_block();
|
||||
m_state.block_count = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void Poly1305::process_block()
|
||||
{
|
||||
u32 a[5];
|
||||
u8 n = m_state.block_count;
|
||||
|
||||
// Add one bit beyond the number of octets. For a 16-byte block,
|
||||
// this is equivalent to adding 2^128 to the number. For the shorter
|
||||
// block, it can be 2^120, 2^112, or any power of two that is evenly
|
||||
// divisible by 8, all the way down to 2^8.
|
||||
m_state.blocks[n++] = 0x01;
|
||||
|
||||
// If the block is not 17 bytes long (the last block), pad it with zeros.
|
||||
// This is meaningless if you are treating the blocks as numbers.
|
||||
while (n < 17) {
|
||||
m_state.blocks[n++] = 0x00;
|
||||
}
|
||||
|
||||
// Read the block as a little-endian number.
|
||||
for (size_t i = 0; i < 16; i += 4) {
|
||||
a[i / 4] = AK::convert_between_host_and_little_endian(ByteReader::load32(m_state.blocks + i));
|
||||
}
|
||||
a[4] = m_state.blocks[16];
|
||||
|
||||
// Add this number to the accumulator.
|
||||
m_state.a[0] += a[0];
|
||||
m_state.a[1] += a[1];
|
||||
m_state.a[2] += a[2];
|
||||
m_state.a[3] += a[3];
|
||||
m_state.a[4] += a[4];
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
|
||||
// Only consider the least significant bits
|
||||
a[0] = m_state.a[0] & 0xFFFFFFFF;
|
||||
a[1] = m_state.a[1] & 0xFFFFFFFF;
|
||||
a[2] = m_state.a[2] & 0xFFFFFFFF;
|
||||
a[3] = m_state.a[3] & 0xFFFFFFFF;
|
||||
a[4] = m_state.a[4] & 0xFFFFFFFF;
|
||||
|
||||
// Multiply by r
|
||||
m_state.a[0] = (u64)a[0] * m_state.r[0];
|
||||
m_state.a[1] = (u64)a[0] * m_state.r[1] + (u64)a[1] * m_state.r[0];
|
||||
m_state.a[2] = (u64)a[0] * m_state.r[2] + (u64)a[1] * m_state.r[1] + (u64)a[2] * m_state.r[0];
|
||||
m_state.a[3] = (u64)a[0] * m_state.r[3] + (u64)a[1] * m_state.r[2] + (u64)a[2] * m_state.r[1] + (u64)a[3] * m_state.r[0];
|
||||
m_state.a[4] = (u64)a[1] * m_state.r[3] + (u64)a[2] * m_state.r[2] + (u64)a[3] * m_state.r[1] + (u64)a[4] * m_state.r[0];
|
||||
m_state.a[5] = (u64)a[2] * m_state.r[3] + (u64)a[3] * m_state.r[2] + (u64)a[4] * m_state.r[1];
|
||||
m_state.a[6] = (u64)a[3] * m_state.r[3] + (u64)a[4] * m_state.r[2];
|
||||
m_state.a[7] = (u64)a[4] * m_state.r[3];
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
m_state.a[5] += m_state.a[4] >> 32;
|
||||
m_state.a[6] += m_state.a[5] >> 32;
|
||||
m_state.a[7] += m_state.a[6] >> 32;
|
||||
|
||||
// Save the high part of the accumulator
|
||||
a[0] = m_state.a[4] & 0xFFFFFFFC;
|
||||
a[1] = m_state.a[5] & 0xFFFFFFFF;
|
||||
a[2] = m_state.a[6] & 0xFFFFFFFF;
|
||||
a[3] = m_state.a[7] & 0xFFFFFFFF;
|
||||
|
||||
// Only consider the least significant bits
|
||||
m_state.a[0] &= 0xFFFFFFFF;
|
||||
m_state.a[1] &= 0xFFFFFFFF;
|
||||
m_state.a[2] &= 0xFFFFFFFF;
|
||||
m_state.a[3] &= 0xFFFFFFFF;
|
||||
m_state.a[4] &= 0x00000003;
|
||||
|
||||
// Fast modular reduction (first pass)
|
||||
m_state.a[0] += a[0];
|
||||
m_state.a[0] += (a[0] >> 2) | (a[1] << 30);
|
||||
m_state.a[1] += a[1];
|
||||
m_state.a[1] += (a[1] >> 2) | (a[2] << 30);
|
||||
m_state.a[2] += a[2];
|
||||
m_state.a[2] += (a[2] >> 2) | (a[3] << 30);
|
||||
m_state.a[3] += a[3];
|
||||
m_state.a[3] += (a[3] >> 2);
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
|
||||
// Save the high part of the accumulator
|
||||
a[0] = m_state.a[4] & 0xFFFFFFFC;
|
||||
|
||||
// Only consider the least significant bits
|
||||
m_state.a[0] &= 0xFFFFFFFF;
|
||||
m_state.a[1] &= 0xFFFFFFFF;
|
||||
m_state.a[2] &= 0xFFFFFFFF;
|
||||
m_state.a[3] &= 0xFFFFFFFF;
|
||||
m_state.a[4] &= 0x00000003;
|
||||
|
||||
// Fast modular reduction (second pass)
|
||||
m_state.a[0] += a[0];
|
||||
m_state.a[0] += a[0] >> 2;
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
|
||||
// Only consider the least significant bits
|
||||
m_state.a[0] &= 0xFFFFFFFF;
|
||||
m_state.a[1] &= 0xFFFFFFFF;
|
||||
m_state.a[2] &= 0xFFFFFFFF;
|
||||
m_state.a[3] &= 0xFFFFFFFF;
|
||||
m_state.a[4] &= 0x00000003;
|
||||
}
|
||||
|
||||
ErrorOr<ByteBuffer> Poly1305::digest()
|
||||
{
|
||||
if (m_state.block_count != 0)
|
||||
process_block();
|
||||
|
||||
u32 b[4];
|
||||
|
||||
// Save the accumulator
|
||||
b[0] = m_state.a[0] & 0xFFFFFFFF;
|
||||
b[1] = m_state.a[1] & 0xFFFFFFFF;
|
||||
b[2] = m_state.a[2] & 0xFFFFFFFF;
|
||||
b[3] = m_state.a[3] & 0xFFFFFFFF;
|
||||
|
||||
// Compute a + 5
|
||||
m_state.a[0] += 5;
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
|
||||
// Select mask based on (a + 5) >= 2^130
|
||||
u32 mask = ((m_state.a[4] & 0x04) >> 2) - 1;
|
||||
|
||||
// Select based on mask
|
||||
m_state.a[0] = (m_state.a[0] & ~mask) | (b[0] & mask);
|
||||
m_state.a[1] = (m_state.a[1] & ~mask) | (b[1] & mask);
|
||||
m_state.a[2] = (m_state.a[2] & ~mask) | (b[2] & mask);
|
||||
m_state.a[3] = (m_state.a[3] & ~mask) | (b[3] & mask);
|
||||
|
||||
// Finally, the value of the secret key "s" is added to the accumulator,
|
||||
// and the 128 least significant bits are serialized in little-endian
|
||||
// order to form the tag.
|
||||
m_state.a[0] += m_state.s[0];
|
||||
m_state.a[1] += m_state.s[1];
|
||||
m_state.a[2] += m_state.s[2];
|
||||
m_state.a[3] += m_state.s[3];
|
||||
|
||||
// Carry
|
||||
m_state.a[1] += m_state.a[0] >> 32;
|
||||
m_state.a[2] += m_state.a[1] >> 32;
|
||||
m_state.a[3] += m_state.a[2] >> 32;
|
||||
m_state.a[4] += m_state.a[3] >> 32;
|
||||
|
||||
// Only consider the least significant bits
|
||||
b[0] = m_state.a[0] & 0xFFFFFFFF;
|
||||
b[1] = m_state.a[1] & 0xFFFFFFFF;
|
||||
b[2] = m_state.a[2] & 0xFFFFFFFF;
|
||||
b[3] = m_state.a[3] & 0xFFFFFFFF;
|
||||
|
||||
ByteBuffer output = TRY(ByteBuffer::create_uninitialized(16));
|
||||
|
||||
for (auto i = 0; i < 4; i++) {
|
||||
ByteReader::store(output.offset_pointer(i * 4), AK::convert_between_host_and_little_endian(b[i]));
|
||||
}
|
||||
|
||||
return output;
|
||||
}
|
||||
|
||||
}
|
||||
34
Userland/Libraries/LibCrypto/Authentication/Poly1305.h
Normal file
34
Userland/Libraries/LibCrypto/Authentication/Poly1305.h
Normal file
|
|
@ -0,0 +1,34 @@
|
|||
/*
|
||||
* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/ByteBuffer.h>
|
||||
|
||||
namespace Crypto::Authentication {
|
||||
|
||||
struct State {
|
||||
u32 r[4] {};
|
||||
u32 s[4] {};
|
||||
u64 a[8] {};
|
||||
u8 blocks[17] {};
|
||||
u8 block_count {};
|
||||
};
|
||||
|
||||
class Poly1305 {
|
||||
|
||||
public:
|
||||
explicit Poly1305(ReadonlyBytes key);
|
||||
void update(ReadonlyBytes message);
|
||||
ErrorOr<ByteBuffer> digest();
|
||||
|
||||
private:
|
||||
void process_block();
|
||||
|
||||
State m_state;
|
||||
};
|
||||
|
||||
}
|
||||
|
|
@ -5,6 +5,7 @@ set(SOURCES
|
|||
ASN1/DER.cpp
|
||||
ASN1/PEM.cpp
|
||||
Authentication/GHash.cpp
|
||||
Authentication/Poly1305.cpp
|
||||
BigInt/Algorithms/BitwiseOperations.cpp
|
||||
BigInt/Algorithms/Division.cpp
|
||||
BigInt/Algorithms/GCD.cpp
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue