Upgrade openssl from 1.1.0e to 1.1.1b, with source code. 4.0.78

trunk/3rdparty/openssl-1.1-fit/crypto/bn/bn_shift.c

@@ -0,0 +1,257 @@
+/*
+ * 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 <assert.h>
+#include "internal/cryptlib.h"
+#include "bn_lcl.h"
+
+int BN_lshift1(BIGNUM *r, const BIGNUM *a)
+{
+    register BN_ULONG *ap, *rp, t, c;
+    int i;
+
+    bn_check_top(r);
+    bn_check_top(a);
+
+    if (r != a) {
+        r->neg = a->neg;
+        if (bn_wexpand(r, a->top + 1) == NULL)
+            return 0;
+        r->top = a->top;
+    } else {
+        if (bn_wexpand(r, a->top + 1) == NULL)
+            return 0;
+    }
+    ap = a->d;
+    rp = r->d;
+    c = 0;
+    for (i = 0; i < a->top; i++) {
+        t = *(ap++);
+        *(rp++) = ((t << 1) | c) & BN_MASK2;
+        c = (t & BN_TBIT) ? 1 : 0;
+    }
+    if (c) {
+        *rp = 1;
+        r->top++;
+    }
+    bn_check_top(r);
+    return 1;
+}
+
+int BN_rshift1(BIGNUM *r, const BIGNUM *a)
+{
+    BN_ULONG *ap, *rp, t, c;
+    int i, j;
+
+    bn_check_top(r);
+    bn_check_top(a);
+
+    if (BN_is_zero(a)) {
+        BN_zero(r);
+        return 1;
+    }
+    i = a->top;
+    ap = a->d;
+    j = i - (ap[i - 1] == 1);
+    if (a != r) {
+        if (bn_wexpand(r, j) == NULL)
+            return 0;
+        r->neg = a->neg;
+    }
+    rp = r->d;
+    t = ap[--i];
+    c = (t & 1) ? BN_TBIT : 0;
+    if (t >>= 1)
+        rp[i] = t;
+    while (i > 0) {
+        t = ap[--i];
+        rp[i] = ((t >> 1) & BN_MASK2) | c;
+        c = (t & 1) ? BN_TBIT : 0;
+    }
+    r->top = j;
+    if (!r->top)
+        r->neg = 0; /* don't allow negative zero */
+    bn_check_top(r);
+    return 1;
+}
+
+int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
+{
+    int ret;
+
+    if (n < 0) {
+        BNerr(BN_F_BN_LSHIFT, BN_R_INVALID_SHIFT);
+        return 0;
+    }
+
+    ret = bn_lshift_fixed_top(r, a, n);
+
+    bn_correct_top(r);
+    bn_check_top(r);
+
+    return ret;
+}
+
+/*
+ * In respect to shift factor the execution time is invariant of
+ * |n % BN_BITS2|, but not |n / BN_BITS2|. Or in other words pre-condition
+ * for constant-time-ness is |n < BN_BITS2| or |n / BN_BITS2| being
+ * non-secret.
+ */
+int bn_lshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n)
+{
+    int i, nw;
+    unsigned int lb, rb;
+    BN_ULONG *t, *f;
+    BN_ULONG l, m, rmask = 0;
+
+    assert(n >= 0);
+
+    bn_check_top(r);
+    bn_check_top(a);
+
+    nw = n / BN_BITS2;
+    if (bn_wexpand(r, a->top + nw + 1) == NULL)
+        return 0;
+
+    if (a->top != 0) {
+        lb = (unsigned int)n % BN_BITS2;
+        rb = BN_BITS2 - lb;
+        rb %= BN_BITS2;            /* say no to undefined behaviour */
+        rmask = (BN_ULONG)0 - rb;  /* rmask = 0 - (rb != 0) */
+        rmask |= rmask >> 8;
+        f = &(a->d[0]);
+        t = &(r->d[nw]);
+        l = f[a->top - 1];
+        t[a->top] = (l >> rb) & rmask;
+        for (i = a->top - 1; i > 0; i--) {
+            m = l << lb;
+            l = f[i - 1];
+            t[i] = (m | ((l >> rb) & rmask)) & BN_MASK2;
+        }
+        t[0] = (l << lb) & BN_MASK2;
+    } else {
+        /* shouldn't happen, but formally required */
+        r->d[nw] = 0;
+    }
+    if (nw != 0)
+        memset(r->d, 0, sizeof(*t) * nw);
+
+    r->neg = a->neg;
+    r->top = a->top + nw + 1;
+    r->flags |= BN_FLG_FIXED_TOP;
+
+    return 1;
+}
+
+int BN_rshift(BIGNUM *r, const BIGNUM *a, int n)
+{
+    int i, j, nw, lb, rb;
+    BN_ULONG *t, *f;
+    BN_ULONG l, tmp;
+
+    bn_check_top(r);
+    bn_check_top(a);
+
+    if (n < 0) {
+        BNerr(BN_F_BN_RSHIFT, BN_R_INVALID_SHIFT);
+        return 0;
+    }
+
+    nw = n / BN_BITS2;
+    rb = n % BN_BITS2;
+    lb = BN_BITS2 - rb;
+    if (nw >= a->top || a->top == 0) {
+        BN_zero(r);
+        return 1;
+    }
+    i = (BN_num_bits(a) - n + (BN_BITS2 - 1)) / BN_BITS2;
+    if (r != a) {
+        if (bn_wexpand(r, i) == NULL)
+            return 0;
+        r->neg = a->neg;
+    } else {
+        if (n == 0)
+            return 1;           /* or the copying loop will go berserk */
+    }
+
+    f = &(a->d[nw]);
+    t = r->d;
+    j = a->top - nw;
+    r->top = i;
+
+    if (rb == 0) {
+        for (i = j; i != 0; i--)
+            *(t++) = *(f++);
+    } else {
+        l = *(f++);
+        for (i = j - 1; i != 0; i--) {
+            tmp = (l >> rb) & BN_MASK2;
+            l = *(f++);
+            *(t++) = (tmp | (l << lb)) & BN_MASK2;
+        }
+        if ((l = (l >> rb) & BN_MASK2))
+            *(t) = l;
+    }
+    if (!r->top)
+        r->neg = 0; /* don't allow negative zero */
+    bn_check_top(r);
+    return 1;
+}
+
+/*
+ * In respect to shift factor the execution time is invariant of
+ * |n % BN_BITS2|, but not |n / BN_BITS2|. Or in other words pre-condition
+ * for constant-time-ness for sufficiently[!] zero-padded inputs is
+ * |n < BN_BITS2| or |n / BN_BITS2| being non-secret.
+ */
+int bn_rshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n)
+{
+    int i, top, nw;
+    unsigned int lb, rb;
+    BN_ULONG *t, *f;
+    BN_ULONG l, m, mask;
+
+    bn_check_top(r);
+    bn_check_top(a);
+
+    assert(n >= 0);
+
+    nw = n / BN_BITS2;
+    if (nw >= a->top) {
+        /* shouldn't happen, but formally required */
+        BN_zero(r);
+        return 1;
+    }
+
+    rb = (unsigned int)n % BN_BITS2;
+    lb = BN_BITS2 - rb;
+    lb %= BN_BITS2;            /* say no to undefined behaviour */
+    mask = (BN_ULONG)0 - lb;   /* mask = 0 - (lb != 0) */
+    mask |= mask >> 8;
+    top = a->top - nw;
+    if (r != a && bn_wexpand(r, top) == NULL)
+        return 0;
+
+    t = &(r->d[0]);
+    f = &(a->d[nw]);
+    l = f[0];
+    for (i = 0; i < top - 1; i++) {
+        m = f[i + 1];
+        t[i] = (l >> rb) | ((m << lb) & mask);
+        l = m;
+    }
+    t[i] = l >> rb;
+
+    r->neg = a->neg;
+    r->top = top;
+    r->flags |= BN_FLG_FIXED_TOP;
+
+    return 1;
+}