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LibCrypto: Add UnsignedBigInteger subtraction and comparison

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This commit is contained in:
Itamar 2020-04-08 13:07:47 +03:00 • committed by Andreas Kling
parent 6201f741d4
commit e0cf40518c
3 changed files with 138 additions and 8 deletions
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72
Userland/test-crypto.cpp
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@ -304,6 +304,7 @@ void hmac_sha512_test_process();
void bigint_test_fibo500();
void bigint_addition_edgecases();
void bigint_subtraction();
int aes_cbc_tests()
{
@ -797,21 +798,26 @@ int bigint_tests()
{
bigint_test_fibo500();
bigint_addition_edgecases();
bigint_subtraction();
return 0;
}
Crypto::UnsignedBigInteger bigint_fibonacci(size_t n)
{
Crypto::UnsignedBigInteger num1(0);
Crypto::UnsignedBigInteger num2(1);
for (size_t i = 0; i < n; ++i) {
Crypto::UnsignedBigInteger t = num1.add(num2);
num2 = num1;
num1 = t;
}
return num1;
}
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 });
bool pass = (bigint_fibonacci(500).words() == AK::Vector<u32> { 315178285, 505575602, 1883328078, 125027121, 3649625763, 347570207, 74535262, 3832543808, 2472133297, 1600064941, 65273441 });
if (pass)
PASS;
@ -838,3 +844,53 @@ void bigint_addition_edgecases()
}
}
}
void bigint_subtraction()
{
{
I_TEST((BigInteger | Simple Subtraction 1));
Crypto::UnsignedBigInteger num1(80);
Crypto::UnsignedBigInteger num2(70);
if (num1.sub(num2) == Crypto::UnsignedBigInteger(10)) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
{
I_TEST((BigInteger | Simple Subtraction 2));
Crypto::UnsignedBigInteger num1(50);
Crypto::UnsignedBigInteger num2(70);
if (num1.sub(num2).is_invalid()) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
{
I_TEST((BigInteger | Subtraction with borrow));
Crypto::UnsignedBigInteger num1(UINT32_MAX);
Crypto::UnsignedBigInteger num2(1);
Crypto::UnsignedBigInteger num3 = num1.add(num2);
Crypto::UnsignedBigInteger result = num3.sub(num2);
if (result == num1) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
{
I_TEST((BigInteger | Subtraction with large numbers));
Crypto::UnsignedBigInteger num1 = bigint_fibonacci(343);
Crypto::UnsignedBigInteger num2 = bigint_fibonacci(218);
Crypto::UnsignedBigInteger result = num1.sub(num2);
if ((result.add(num2) == num1)
&& (result.words() == Vector<u32> { 811430588, 2958904896, 1130908877, 2830569969, 3243275482, 3047460725, 774025231, 7990 })) {
PASS;
} else {
FAIL(Incorrect Result);
}
}
}