1 files changed, 171 insertions, 0 deletions
diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/bn/bn_add.c b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/bn/bn_add.c
new file mode 100644
index 000000000..8ffe49618
--- /dev/null
+++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/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;
+}
+