zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libssl/openssl-1.1.1o/crypto/bn/bn_add.c b/ap/lib/libssl/openssl-1.1.1o/crypto/bn/bn_add.c
new file mode 100644
index 0000000..8ffe496
--- /dev/null
+++ b/ap/lib/libssl/openssl-1.1.1o/crypto/bn/bn_add.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "internal/cryptlib.h"
+#include "bn_local.h"
+
+/* signed add of b to a. */
+int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
+{
+ int ret, r_neg, cmp_res;
+
+ bn_check_top(a);
+ bn_check_top(b);
+
+ if (a->neg == b->neg) {
+ r_neg = a->neg;
+ ret = BN_uadd(r, a, b);
+ } else {
+ cmp_res = BN_ucmp(a, b);
+ if (cmp_res > 0) {
+ r_neg = a->neg;
+ ret = BN_usub(r, a, b);
+ } else if (cmp_res < 0) {
+ r_neg = b->neg;
+ ret = BN_usub(r, b, a);
+ } else {
+ r_neg = 0;
+ BN_zero(r);
+ ret = 1;
+ }
+ }
+
+ r->neg = r_neg;
+ bn_check_top(r);
+ return ret;
+}
+
+/* signed sub of b from a. */
+int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
+{
+ int ret, r_neg, cmp_res;
+
+ bn_check_top(a);
+ bn_check_top(b);
+
+ if (a->neg != b->neg) {
+ r_neg = a->neg;
+ ret = BN_uadd(r, a, b);
+ } else {
+ cmp_res = BN_ucmp(a, b);
+ if (cmp_res > 0) {
+ r_neg = a->neg;
+ ret = BN_usub(r, a, b);
+ } else if (cmp_res < 0) {
+ r_neg = !b->neg;
+ ret = BN_usub(r, b, a);
+ } else {
+ r_neg = 0;
+ BN_zero(r);
+ ret = 1;
+ }
+ }
+
+ r->neg = r_neg;
+ bn_check_top(r);
+ return ret;
+}
+
+/* unsigned add of b to a, r can be equal to a or b. */
+int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
+{
+ int max, min, dif;
+ const BN_ULONG *ap, *bp;
+ BN_ULONG *rp, carry, t1, t2;
+
+ bn_check_top(a);
+ bn_check_top(b);
+
+ if (a->top < b->top) {
+ const BIGNUM *tmp;
+
+ tmp = a;
+ a = b;
+ b = tmp;
+ }
+ max = a->top;
+ min = b->top;
+ dif = max - min;
+
+ if (bn_wexpand(r, max + 1) == NULL)
+ return 0;
+
+ r->top = max;
+
+ ap = a->d;
+ bp = b->d;
+ rp = r->d;
+
+ carry = bn_add_words(rp, ap, bp, min);
+ rp += min;
+ ap += min;
+
+ while (dif) {
+ dif--;
+ t1 = *(ap++);
+ t2 = (t1 + carry) & BN_MASK2;
+ *(rp++) = t2;
+ carry &= (t2 == 0);
+ }
+ *rp = carry;
+ r->top += carry;
+
+ r->neg = 0;
+ bn_check_top(r);
+ return 1;
+}
+
+/* unsigned subtraction of b from a, a must be larger than b. */
+int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
+{
+ int max, min, dif;
+ BN_ULONG t1, t2, borrow, *rp;
+ const BN_ULONG *ap, *bp;
+
+ bn_check_top(a);
+ bn_check_top(b);
+
+ max = a->top;
+ min = b->top;
+ dif = max - min;
+
+ if (dif < 0) { /* hmm... should not be happening */
+ BNerr(BN_F_BN_USUB, BN_R_ARG2_LT_ARG3);
+ return 0;
+ }
+
+ if (bn_wexpand(r, max) == NULL)
+ return 0;
+
+ ap = a->d;
+ bp = b->d;
+ rp = r->d;
+
+ borrow = bn_sub_words(rp, ap, bp, min);
+ ap += min;
+ rp += min;
+
+ while (dif) {
+ dif--;
+ t1 = *(ap++);
+ t2 = (t1 - borrow) & BN_MASK2;
+ *(rp++) = t2;
+ borrow &= (t1 == 0);
+ }
+
+ while (max && *--rp == 0)
+ max--;
+
+ r->top = max;
+ r->neg = 0;
+ bn_pollute(r);
+
+ return 1;
+}
+