Initial commit of BoringSSL for Android.

1 files changed, 620 insertions, 0 deletions

diff --git a/src/crypto/bn/div.c b/src/crypto/bn/div.c
new file mode 100644
index 0000000..d65957a
--- /dev/null
+++ b/src/crypto/bn/div.c
@@ -0,0 +1,620 @@
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.] */
+
+#include <openssl/bn.h>
+
+#include <limits.h>
+#include <openssl/err.h>
+
+#include "internal.h"
+
+
+#define asm __asm__
+
+#if !defined(OPENSSL_NO_ASM)
+# if defined(__GNUC__) && __GNUC__>=2
+#  if defined(OPENSSL_X86)
+   /*
+    * There were two reasons for implementing this template:
+    * - GNU C generates a call to a function (__udivdi3 to be exact)
+    *   in reply to ((((BN_ULLONG)n0)<<BN_BITS2)|n1)/d0 (I fail to
+    *   understand why...);
+    * - divl doesn't only calculate quotient, but also leaves
+    *   remainder in %edx which we can definitely use here:-)
+    *
+    *					<appro@fy.chalmers.se>
+    */
+#undef div_asm
+#  define div_asm(n0,n1,d0)		\
+	({  asm volatile (			\
+		"divl	%4"			\
+		: "=a"(q), "=d"(rem)		\
+		: "a"(n1), "d"(n0), "g"(d0)	\
+		: "cc");			\
+	    q;					\
+	})
+#  define REMAINDER_IS_ALREADY_CALCULATED
+#  elif defined(OPENSSL_X86_64)
+   /*
+    * Same story here, but it's 128-bit by 64-bit division. Wow!
+    *					<appro@fy.chalmers.se>
+    */
+#  undef div_asm
+#  define div_asm(n0,n1,d0)		\
+	({  asm volatile (			\
+		"divq	%4"			\
+		: "=a"(q), "=d"(rem)		\
+		: "a"(n1), "d"(n0), "g"(d0)	\
+		: "cc");			\
+	    q;					\
+	})
+#  define REMAINDER_IS_ALREADY_CALCULATED
+#  endif /* __<cpu> */
+# endif /* __GNUC__ */
+#endif /* OPENSSL_NO_ASM */
+
+/* BN_div computes  dv := num / divisor,  rounding towards
+ * zero, and sets up rm  such that  dv*divisor + rm = num  holds.
+ * Thus:
+ *     dv->neg == num->neg ^ divisor->neg  (unless the result is zero)
+ *     rm->neg == num->neg                 (unless the remainder is zero)
+ * If 'dv' or 'rm' is NULL, the respective value is not returned. */
+int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
+           BN_CTX *ctx) {
+  int norm_shift, i, loop;
+  BIGNUM *tmp, wnum, *snum, *sdiv, *res;
+  BN_ULONG *resp, *wnump;
+  BN_ULONG d0, d1;
+  int num_n, div_n;
+  int no_branch = 0;
+
+  /* Invalid zero-padding would have particularly bad consequences
+   * so don't just rely on bn_check_top() here */
+  if ((num->top > 0 && num->d[num->top - 1] == 0) ||
+      (divisor->top > 0 && divisor->d[divisor->top - 1] == 0)) {
+    OPENSSL_PUT_ERROR(BN, BN_div, BN_R_NOT_INITIALIZED);
+    return 0;
+  }
+
+  if ((num->flags & BN_FLG_CONSTTIME) != 0 ||
+      (divisor->flags & BN_FLG_CONSTTIME) != 0) {
+    no_branch = 1;
+  }
+
+  if (BN_is_zero(divisor)) {
+    OPENSSL_PUT_ERROR(BN, BN_div, BN_R_DIV_BY_ZERO);
+    return 0;
+  }
+
+  if (!no_branch && BN_ucmp(num, divisor) < 0) {
+    if (rm != NULL) {
+      if (BN_copy(rm, num) == NULL) {
+        return 0;
+      }
+    }
+    if (dv != NULL) {
+      BN_zero(dv);
+    }
+    return 1;
+  }
+
+  BN_CTX_start(ctx);
+  tmp = BN_CTX_get(ctx);
+  snum = BN_CTX_get(ctx);
+  sdiv = BN_CTX_get(ctx);
+  if (dv == NULL) {
+    res = BN_CTX_get(ctx);
+  } else {
+    res = dv;
+  }
+  if (sdiv == NULL || res == NULL || tmp == NULL || snum == NULL) {
+    goto err;
+  }
+
+  /* First we normalise the numbers */
+  norm_shift = BN_BITS2 - ((BN_num_bits(divisor)) % BN_BITS2);
+  if (!(BN_lshift(sdiv, divisor, norm_shift))) {
+    goto err;
+  }
+  sdiv->neg = 0;
+  norm_shift += BN_BITS2;
+  if (!(BN_lshift(snum, num, norm_shift))) {
+    goto err;
+  }
+  snum->neg = 0;
+
+  if (no_branch) {
+    /* Since we don't know whether snum is larger than sdiv,
+     * we pad snum with enough zeroes without changing its
+     * value.
+     */
+    if (snum->top <= sdiv->top + 1) {
+      if (bn_wexpand(snum, sdiv->top + 2) == NULL) {
+        goto err;
+      }
+      for (i = snum->top; i < sdiv->top + 2; i++) {
+        snum->d[i] = 0;
+      }
+      snum->top = sdiv->top + 2;
+    } else {
+      if (bn_wexpand(snum, snum->top + 1) == NULL) {
+        goto err;
+      }
+      snum->d[snum->top] = 0;
+      snum->top++;
+    }
+  }
+
+  div_n = sdiv->top;
+  num_n = snum->top;
+  loop = num_n - div_n;
+  /* Lets setup a 'window' into snum
+   * This is the part that corresponds to the current
+   * 'area' being divided */
+  wnum.neg = 0;
+  wnum.d = &(snum->d[loop]);
+  wnum.top = div_n;
+  /* only needed when BN_ucmp messes up the values between top and max */
+  wnum.dmax = snum->dmax - loop; /* so we don't step out of bounds */
+
+  /* Get the top 2 words of sdiv */
+  /* div_n=sdiv->top; */
+  d0 = sdiv->d[div_n - 1];
+  d1 = (div_n == 1) ? 0 : sdiv->d[div_n - 2];
+
+  /* pointer to the 'top' of snum */
+  wnump = &(snum->d[num_n - 1]);
+
+  /* Setup to 'res' */
+  res->neg = (num->neg ^ divisor->neg);
+  if (!bn_wexpand(res, (loop + 1))) {
+    goto err;
+  }
+  res->top = loop - no_branch;
+  resp = &(res->d[loop - 1]);
+
+  /* space for temp */
+  if (!bn_wexpand(tmp, (div_n + 1))) {
+    goto err;
+  }
+
+  if (!no_branch) {
+    if (BN_ucmp(&wnum, sdiv) >= 0) {
+      bn_sub_words(wnum.d, wnum.d, sdiv->d, div_n);
+      *resp = 1;
+    } else {
+      res->top--;
+    }
+  }
+
+  /* if res->top == 0 then clear the neg value otherwise decrease
+   * the resp pointer */
+  if (res->top == 0) {
+    res->neg = 0;
+  } else {
+    resp--;
+  }
+
+  for (i = 0; i < loop - 1; i++, wnump--, resp--) {
+    BN_ULONG q, l0;
+    /* the first part of the loop uses the top two words of snum and sdiv to
+     * calculate a BN_ULONG q such that | wnum - sdiv * q | < sdiv */
+    BN_ULONG n0, n1, rem = 0;
+
+    n0 = wnump[0];
+    n1 = wnump[-1];
+    if (n0 == d0) {
+      q = BN_MASK2;
+    } else {
+      /* n0 < d0 */
+#ifdef BN_LLONG
+      BN_ULLONG t2;
+
+#if defined(BN_LLONG) && !defined(div_asm)
+      q = (BN_ULONG)(((((BN_ULLONG)n0) << BN_BITS2) | n1) / d0);
+#else
+      q = div_asm(n0, n1, d0);
+#endif
+
+#ifndef REMAINDER_IS_ALREADY_CALCULATED
+      /* rem doesn't have to be BN_ULLONG. The least we know it's less that d0,
+       * isn't it? */
+      rem = (n1 - q * d0) & BN_MASK2;
+#endif
+
+      t2 = (BN_ULLONG)d1 * q;
+
+      for (;;) {
+        if (t2 <= ((((BN_ULLONG)rem) << BN_BITS2) | wnump[-2]))
+          break;
+        q--;
+        rem += d0;
+        if (rem < d0)
+          break; /* don't let rem overflow */
+        t2 -= d1;
+      }
+#else /* !BN_LLONG */
+      BN_ULONG t2l, t2h;
+
+#if defined(div_asm)
+      q = div_asm(n0, n1, d0);
+#else
+      q = bn_div_words(n0, n1, d0);
+#endif
+
+#ifndef REMAINDER_IS_ALREADY_CALCULATED
+      rem = (n1 - q * d0) & BN_MASK2;
+#endif
+
+#if defined(BN_UMULT_LOHI)
+      BN_UMULT_LOHI(t2l, t2h, d1, q);
+#elif defined(BN_UMULT_HIGH)
+      t2l = d1 * q;
+      t2h = BN_UMULT_HIGH(d1, q);
+#else
+      {
+        BN_ULONG ql, qh;
+        t2l = LBITS(d1);
+        t2h = HBITS(d1);
+        ql = LBITS(q);
+        qh = HBITS(q);
+        mul64(t2l, t2h, ql, qh); /* t2=(BN_ULLONG)d1*q; */
+      }
+#endif
+
+      for (;;) {
+        if ((t2h < rem) || ((t2h == rem) && (t2l <= wnump[-2])))
+          break;
+        q--;
+        rem += d0;
+        if (rem < d0)
+          break; /* don't let rem overflow */
+        if (t2l < d1)
+          t2h--;
+        t2l -= d1;
+      }
+#endif /* !BN_LLONG */
+    }
+
+    l0 = bn_mul_words(tmp->d, sdiv->d, div_n, q);
+    tmp->d[div_n] = l0;
+    wnum.d--;
+    /* ingore top values of the bignums just sub the two
+     * BN_ULONG arrays with bn_sub_words */
+    if (bn_sub_words(wnum.d, wnum.d, tmp->d, div_n + 1)) {
+      /* Note: As we have considered only the leading
+       * two BN_ULONGs in the calculation of q, sdiv * q
+       * might be greater than wnum (but then (q-1) * sdiv
+       * is less or equal than wnum)
+       */
+      q--;
+      if (bn_add_words(wnum.d, wnum.d, sdiv->d, div_n)) {
+        /* we can't have an overflow here (assuming
+         * that q != 0, but if q == 0 then tmp is
+         * zero anyway) */
+        (*wnump)++;
+      }
+    }
+    /* store part of the result */
+    *resp = q;
+  }
+  bn_correct_top(snum);
+  if (rm != NULL) {
+    /* Keep a copy of the neg flag in num because if rm==num
+     * BN_rshift() will overwrite it.
+     */
+    int neg = num->neg;
+    BN_rshift(rm, snum, norm_shift);
+    if (!BN_is_zero(rm)) {
+      rm->neg = neg;
+    }
+  }
+  if (no_branch) {
+    bn_correct_top(res);
+  }
+  BN_CTX_end(ctx);
+  return 1;
+
+err:
+  BN_CTX_end(ctx);
+  return 0;
+}
+
+int BN_nnmod(BIGNUM *r, const BIGNUM *m, const BIGNUM *d, BN_CTX *ctx) {
+  if (!(BN_mod(r, m, d, ctx))) {
+    return 0;
+  }
+  if (!r->neg) {
+    return 1;
+  }
+
+  /* now -|d| < r < 0, so we have to set r := r + |d|. */
+  return (d->neg ? BN_sub : BN_add)(r, r, d);
+}
+
+int BN_mod_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
+               BN_CTX *ctx) {
+  if (!BN_add(r, a, b)) {
+    return 0;
+  }
+  return BN_nnmod(r, r, m, ctx);
+}
+
+int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+                     const BIGNUM *m) {
+  if (!BN_uadd(r, a, b)) {
+    return 0;
+  }
+  if (BN_ucmp(r, m) >= 0) {
+    return BN_usub(r, r, m);
+  }
+  return 1;
+}
+
+int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
+               BN_CTX *ctx) {
+  if (!BN_sub(r, a, b)) {
+    return 0;
+  }
+  return BN_nnmod(r, r, m, ctx);
+}
+
+/* BN_mod_sub variant that may be used if both  a  and  b  are non-negative
+ * and less than  m */
+int BN_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+                     const BIGNUM *m) {
+  if (!BN_sub(r, a, b)) {
+    return 0;
+  }
+  if (r->neg) {
+    return BN_add(r, r, m);
+  }
+  return 1;
+}
+
+int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
+               BN_CTX *ctx) {
+  BIGNUM *t;
+  int ret = 0;
+
+  BN_CTX_start(ctx);
+  t = BN_CTX_get(ctx);
+  if (t == NULL) {
+    goto err;
+  }
+
+  if (a == b) {
+    if (!BN_sqr(t, a, ctx)) {
+      goto err;
+    }
+  } else {
+    if (!BN_mul(t, a, b, ctx)) {
+      goto err;
+    }
+  }
+
+  if (!BN_nnmod(r, t, m, ctx)) {
+    goto err;
+  }
+
+  ret = 1;
+
+err:
+  BN_CTX_end(ctx);
+  return ret;
+}
+
+int BN_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx) {
+  if (!BN_sqr(r, a, ctx)) {
+    return 0;
+  }
+
+  /* r->neg == 0,  thus we don't need BN_nnmod */
+  return BN_mod(r, r, m, ctx);
+}
+
+int BN_mod_lshift(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *m,
+                  BN_CTX *ctx) {
+  BIGNUM *abs_m = NULL;
+  int ret;
+
+  if (!BN_nnmod(r, a, m, ctx)) {
+    return 0;
+  }
+
+  if (m->neg) {
+    abs_m = BN_dup(m);
+    if (abs_m == NULL) {
+      return 0;
+    }
+    abs_m->neg = 0;
+  }
+
+  ret = BN_mod_lshift_quick(r, r, n, (abs_m ? abs_m : m));
+
+  if (abs_m) {
+    BN_free(abs_m);
+  }
+  return ret;
+}
+
+int BN_mod_lshift_quick(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *m) {
+  if (r != a) {
+    if (BN_copy(r, a) == NULL) {
+      return 0;
+    }
+  }
+
+  while (n > 0) {
+    int max_shift;
+
+    /* 0 < r < m */
+    max_shift = BN_num_bits(m) - BN_num_bits(r);
+    /* max_shift >= 0 */
+
+    if (max_shift < 0) {
+      OPENSSL_PUT_ERROR(BN, BN_mod_lshift_quick, BN_R_INPUT_NOT_REDUCED);
+      return 0;
+    }
+
+    if (max_shift > n) {
+      max_shift = n;
+    }
+
+    if (max_shift) {
+      if (!BN_lshift(r, r, max_shift)) {
+        return 0;
+      }
+      n -= max_shift;
+    } else {
+      if (!BN_lshift1(r, r)) {
+        return 0;
+      }
+      --n;
+    }
+
+    /* BN_num_bits(r) <= BN_num_bits(m) */
+    if (BN_cmp(r, m) >= 0) {
+      if (!BN_sub(r, r, m)) {
+        return 0;
+      }
+    }
+  }
+
+  return 1;
+}
+
+int BN_mod_lshift1(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx) {
+  if (!BN_lshift1(r, a)) {
+    return 0;
+  }
+
+  return BN_nnmod(r, r, m, ctx);
+}
+
+int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m) {
+  if (!BN_lshift1(r, a)) {
+    return 0;
+  }
+  if (BN_cmp(r, m) >= 0) {
+    return BN_sub(r, r, m);
+  }
+
+  return 1;
+}
+
+BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w) {
+  BN_ULONG ret = 0;
+  int i, j;
+
+  w &= BN_MASK2;
+
+  if (!w) {
+    /* actually this an error (division by zero) */
+    return (BN_ULONG) - 1;
+  }
+
+  if (a->top == 0) {
+    return 0;
+  }
+
+  /* normalize input (so bn_div_words doesn't complain) */
+  j = BN_BITS2 - BN_num_bits_word(w);
+  w <<= j;
+  if (!BN_lshift(a, a, j)) {
+    return (BN_ULONG) - 1;
+  }
+
+  for (i = a->top - 1; i >= 0; i--) {
+    BN_ULONG l, d;
+
+    l = a->d[i];
+    d = bn_div_words(ret, l, w);
+    ret = (l - ((d * w) & BN_MASK2)) & BN_MASK2;
+    a->d[i] = d;
+  }
+
+  if ((a->top > 0) && (a->d[a->top - 1] == 0)) {
+    a->top--;
+  }
+
+  ret >>= j;
+  return ret;
+}
+
+BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w) {
+#ifndef BN_LLONG
+  BN_ULONG ret = 0;
+#else
+  BN_ULLONG ret = 0;
+#endif
+  int i;
+
+  if (w == 0) {
+    return (BN_ULONG) -1;
+  }
+
+  w &= BN_MASK2;
+  for (i = a->top - 1; i >= 0; i--) {
+#ifndef BN_LLONG
+    ret = ((ret << BN_BITS4) | ((a->d[i] >> BN_BITS4) & BN_MASK2l)) % w;
+    ret = ((ret << BN_BITS4) | (a->d[i] & BN_MASK2l)) % w;
+#else
+    ret = (BN_ULLONG)(((ret << (BN_ULLONG)BN_BITS2) | a->d[i]) % (BN_ULLONG)w);
+#endif
+  }
+  return (BN_ULONG)ret;
+}