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LibCrypto: Add UnsignedBigInteger and implement addition

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UnsignedBigInteger stores an unsigned ainteger of arbitrary length.

A big integer is represented  as a vector of word. Each
word is an unsigned int.
This commit is contained in:
Itamar 2020-04-07 22:37:42 +03:00 • committed by Andreas Kling
parent 8c645916b4
commit 6201f741d4
4 changed files with 209 additions and 1 deletions
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57
Userland/test-crypto.cpp
View file

@ -1,6 +1,8 @@
#include <LibC/limits.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCrypto/Authentication/HMAC.h>
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
#include <LibCrypto/Cipher/AES.h>
#include <LibCrypto/Hash/MD5.h>
#include <LibCrypto/Hash/SHA2.h>
@ -35,6 +37,9 @@ int hmac_md5_tests();
int hmac_sha256_tests();
int hmac_sha512_tests();
// Big Integer
int bigint_tests();
// stop listing tests
void print_buffer(const ByteBuffer& buffer, int split)
@ -227,6 +232,9 @@ auto main(int argc, char** argv) -> int
printf("unknown hash function '%s'\n", suite);
return 1;
}
if (mode_sv == "bigint") {
return bigint_tests();
}
encrypting = mode_sv == "encrypt";
if (encrypting || mode_sv == "decrypt") {
if (suite == nullptr)
@ -294,6 +302,9 @@ void hmac_sha256_test_process();
void hmac_sha512_test_name();
void hmac_sha512_test_process();
void bigint_test_fibo500();
void bigint_addition_edgecases();
int aes_cbc_tests()
{
aes_cbc_test_name();
@ -781,3 +792,49 @@ void hmac_sha512_test_process()
PASS;
}
}
int bigint_tests()
{
bigint_test_fibo500();
bigint_addition_edgecases();
return 0;
}
void bigint_test_fibo500()
{
{
I_TEST((BigInteger | Fibonacci500));
Crypto::UnsignedBigInteger num1(0);
Crypto::UnsignedBigInteger num2(1);
for (int i = 0; i < 500; ++i) {
Crypto::UnsignedBigInteger t = num1.add(num2);
num2 = num1;
num1 = t;
}
bool pass = (num1.words() == AK::Vector<u32> { 315178285, 505575602, 1883328078, 125027121, 3649625763, 347570207, 74535262, 3832543808, 2472133297, 1600064941, 65273441 });
if (pass)
PASS;
else {
FAIL(Incorrect Result);
}
}
}
void bigint_addition_edgecases()
{
{
I_TEST((BigInteger | Edge Cases));
Crypto::UnsignedBigInteger num1;
Crypto::UnsignedBigInteger num2(70);
Crypto::UnsignedBigInteger num3 = num1.add(num2);
bool pass = (num3 == num2);
pass &= (num1 == Crypto::UnsignedBigInteger(0));
if (pass) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
}