Remove unnecessary files in third_party/bigint

This patch follows the initial check in of big integer library at
https://pdfium.googlesource.com/pdfium/+/7504b3d87d6143661746d85c3c3e4052939b4e52

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/773923002

1 files changed, 0 insertions, 70 deletions

diff --git a/third_party/bigint/BigIntegerAlgorithms.cc b/third_party/bigint/BigIntegerAlgorithms.cc
deleted file mode 100644
index 7edebda76a..0000000000
--- a/third_party/bigint/BigIntegerAlgorithms.cc
+++ /dev/null
@@ -1,70 +0,0 @@
-#include "BigIntegerAlgorithms.hh"
-
-BigUnsigned gcd(BigUnsigned a, BigUnsigned b) {
-	BigUnsigned trash;
-	// Neat in-place alternating technique.
-	for (;;) {
-		if (b.isZero())
-			return a;
-		a.divideWithRemainder(b, trash);
-		if (a.isZero())
-			return b;
-		b.divideWithRemainder(a, trash);
-	}
-}
-
-void extendedEuclidean(BigInteger m, BigInteger n,
-		BigInteger &g, BigInteger &r, BigInteger &s) {
-	if (&g == &r || &g == &s || &r == &s)
-		throw "BigInteger extendedEuclidean: Outputs are aliased";
-	BigInteger r1(1), s1(0), r2(0), s2(1), q;
-	/* Invariants:
-	 * r1*m(orig) + s1*n(orig) == m(current)
-	 * r2*m(orig) + s2*n(orig) == n(current) */
-	for (;;) {
-		if (n.isZero()) {
-			r = r1; s = s1; g = m;
-			return;
-		}
-		// Subtract q times the second invariant from the first invariant.
-		m.divideWithRemainder(n, q);
-		r1 -= q*r2; s1 -= q*s2;
-
-		if (m.isZero()) {
-			r = r2; s = s2; g = n;
-			return;
-		}
-		// Subtract q times the first invariant from the second invariant.
-		n.divideWithRemainder(m, q);
-		r2 -= q*r1; s2 -= q*s1;
-	}
-}
-
-BigUnsigned modinv(const BigInteger &x, const BigUnsigned &n) {
-	BigInteger g, r, s;
-	extendedEuclidean(x, n, g, r, s);
-	if (g == 1)
-		// r*x + s*n == 1, so r*x === 1 (mod n), so r is the answer.
-		return (r % n).getMagnitude(); // (r % n) will be nonnegative
-	else
-		throw "BigInteger modinv: x and n have a common factor";
-}
-
-BigUnsigned modexp(const BigInteger &base, const BigUnsigned &exponent,
-		const BigUnsigned &modulus) {
-	BigUnsigned ans = 1, base2 = (base % modulus).getMagnitude();
-	BigUnsigned::Index i = exponent.bitLength();
-	// For each bit of the exponent, most to least significant...
-	while (i > 0) {
-		i--;
-		// Square.
-		ans *= ans;
-		ans %= modulus;
-		// And multiply if the bit is a 1.
-		if (exponent.getBit(i)) {
-			ans *= base2;
-			ans %= modulus;
-		}
-	}
-	return ans;
-}