--- /dev/null
+/* Copyright (C) 1995-1997 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.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
+ *
+ * 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 above 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 acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ *
+ * Portions of the attached software ("Contribution") are developed by
+ * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
+ *
+ * The Contribution is licensed pursuant to the Eric Young open source
+ * license provided above.
+ *
+ * The binary polynomial arithmetic software is originally written by
+ * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
+ * Laboratories. */
+
+#ifndef OPENSSL_HEADER_BN_H
+#define OPENSSL_HEADER_BN_H
+
+#include <openssl/base.h>
+#include <openssl/thread.h>
+
+#include <inttypes.h> // for PRIu64 and friends
+#include <stdio.h> // for FILE*
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// BN provides support for working with arbitrary sized integers. For example,
+// although the largest integer supported by the compiler might be 64 bits, BN
+// will allow you to work with numbers until you run out of memory.
+
+
+// BN_ULONG is the native word size when working with big integers.
+//
+// Note: on some platforms, inttypes.h does not define print format macros in
+// C++ unless |__STDC_FORMAT_MACROS| defined. As this is a public header, bn.h
+// does not define |__STDC_FORMAT_MACROS| itself. C++ source files which use the
+// FMT macros must define it externally.
+#if defined(OPENSSL_64_BIT)
+#define BN_ULONG uint64_t
+#define BN_BITS2 64
+#define BN_DEC_FMT1 "%" PRIu64
+#define BN_DEC_FMT2 "%019" PRIu64
+#define BN_HEX_FMT1 "%" PRIx64
+#define BN_HEX_FMT2 "%016" PRIx64
+#elif defined(OPENSSL_32_BIT)
+#define BN_ULONG uint32_t
+#define BN_BITS2 32
+#define BN_DEC_FMT1 "%" PRIu32
+#define BN_DEC_FMT2 "%09" PRIu32
+#define BN_HEX_FMT1 "%" PRIx32
+#define BN_HEX_FMT2 "%08" PRIx64
+#else
+#error "Must define either OPENSSL_32_BIT or OPENSSL_64_BIT"
+#endif
+
+
+// Allocation and freeing.
+
+// BN_new creates a new, allocated BIGNUM and initialises it.
+OPENSSL_EXPORT BIGNUM *BN_new(void);
+
+// BN_init initialises a stack allocated |BIGNUM|.
+OPENSSL_EXPORT void BN_init(BIGNUM *bn);
+
+// BN_free frees the data referenced by |bn| and, if |bn| was originally
+// allocated on the heap, frees |bn| also.
+OPENSSL_EXPORT void BN_free(BIGNUM *bn);
+
+// BN_clear_free erases and frees the data referenced by |bn| and, if |bn| was
+// originally allocated on the heap, frees |bn| also.
+OPENSSL_EXPORT void BN_clear_free(BIGNUM *bn);
+
+// BN_dup allocates a new BIGNUM and sets it equal to |src|. It returns the
+// allocated BIGNUM on success or NULL otherwise.
+OPENSSL_EXPORT BIGNUM *BN_dup(const BIGNUM *src);
+
+// BN_copy sets |dest| equal to |src| and returns |dest| or NULL on allocation
+// failure.
+OPENSSL_EXPORT BIGNUM *BN_copy(BIGNUM *dest, const BIGNUM *src);
+
+// BN_clear sets |bn| to zero and erases the old data.
+OPENSSL_EXPORT void BN_clear(BIGNUM *bn);
+
+// BN_value_one returns a static BIGNUM with value 1.
+OPENSSL_EXPORT const BIGNUM *BN_value_one(void);
+
+
+// Basic functions.
+
+// BN_num_bits returns the minimum number of bits needed to represent the
+// absolute value of |bn|.
+OPENSSL_EXPORT unsigned BN_num_bits(const BIGNUM *bn);
+
+// BN_num_bytes returns the minimum number of bytes needed to represent the
+// absolute value of |bn|.
+OPENSSL_EXPORT unsigned BN_num_bytes(const BIGNUM *bn);
+
+// BN_zero sets |bn| to zero.
+OPENSSL_EXPORT void BN_zero(BIGNUM *bn);
+
+// BN_one sets |bn| to one. It returns one on success or zero on allocation
+// failure.
+OPENSSL_EXPORT int BN_one(BIGNUM *bn);
+
+// BN_set_word sets |bn| to |value|. It returns one on success or zero on
+// allocation failure.
+OPENSSL_EXPORT int BN_set_word(BIGNUM *bn, BN_ULONG value);
+
+// BN_set_u64 sets |bn| to |value|. It returns one on success or zero on
+// allocation failure.
+OPENSSL_EXPORT int BN_set_u64(BIGNUM *bn, uint64_t value);
+
+// BN_set_negative sets the sign of |bn|.
+OPENSSL_EXPORT void BN_set_negative(BIGNUM *bn, int sign);
+
+// BN_is_negative returns one if |bn| is negative and zero otherwise.
+OPENSSL_EXPORT int BN_is_negative(const BIGNUM *bn);
+
+
+// Conversion functions.
+
+// BN_bin2bn sets |*ret| to the value of |len| bytes from |in|, interpreted as
+// a big-endian number, and returns |ret|. If |ret| is NULL then a fresh
+// |BIGNUM| is allocated and returned. It returns NULL on allocation
+// failure.
+OPENSSL_EXPORT BIGNUM *BN_bin2bn(const uint8_t *in, size_t len, BIGNUM *ret);
+
+// BN_bn2bin serialises the absolute value of |in| to |out| as a big-endian
+// integer, which must have |BN_num_bytes| of space available. It returns the
+// number of bytes written. Note this function leaks the magnitude of |in|. If
+// |in| is secret, use |BN_bn2bin_padded| instead.
+OPENSSL_EXPORT size_t BN_bn2bin(const BIGNUM *in, uint8_t *out);
+
+// BN_le2bn sets |*ret| to the value of |len| bytes from |in|, interpreted as
+// a little-endian number, and returns |ret|. If |ret| is NULL then a fresh
+// |BIGNUM| is allocated and returned. It returns NULL on allocation
+// failure.
+OPENSSL_EXPORT BIGNUM *BN_le2bn(const uint8_t *in, size_t len, BIGNUM *ret);
+
+// BN_bn2le_padded serialises the absolute value of |in| to |out| as a
+// little-endian integer, which must have |len| of space available, padding
+// out the remainder of out with zeros. If |len| is smaller than |BN_num_bytes|,
+// the function fails and returns 0. Otherwise, it returns 1.
+OPENSSL_EXPORT int BN_bn2le_padded(uint8_t *out, size_t len, const BIGNUM *in);
+
+// BN_bn2bin_padded serialises the absolute value of |in| to |out| as a
+// big-endian integer. The integer is padded with leading zeros up to size
+// |len|. If |len| is smaller than |BN_num_bytes|, the function fails and
+// returns 0. Otherwise, it returns 1.
+OPENSSL_EXPORT int BN_bn2bin_padded(uint8_t *out, size_t len, const BIGNUM *in);
+
+// BN_bn2cbb_padded behaves like |BN_bn2bin_padded| but writes to a |CBB|.
+OPENSSL_EXPORT int BN_bn2cbb_padded(CBB *out, size_t len, const BIGNUM *in);
+
+// BN_bn2hex returns an allocated string that contains a NUL-terminated, hex
+// representation of |bn|. If |bn| is negative, the first char in the resulting
+// string will be '-'. Returns NULL on allocation failure.
+OPENSSL_EXPORT char *BN_bn2hex(const BIGNUM *bn);
+
+// BN_hex2bn parses the leading hex number from |in|, which may be proceeded by
+// a '-' to indicate a negative number and may contain trailing, non-hex data.
+// If |outp| is not NULL, it constructs a BIGNUM equal to the hex number and
+// stores it in |*outp|. If |*outp| is NULL then it allocates a new BIGNUM and
+// updates |*outp|. It returns the number of bytes of |in| processed or zero on
+// error.
+OPENSSL_EXPORT int BN_hex2bn(BIGNUM **outp, const char *in);
+
+// BN_bn2dec returns an allocated string that contains a NUL-terminated,
+// decimal representation of |bn|. If |bn| is negative, the first char in the
+// resulting string will be '-'. Returns NULL on allocation failure.
+OPENSSL_EXPORT char *BN_bn2dec(const BIGNUM *a);
+
+// BN_dec2bn parses the leading decimal number from |in|, which may be
+// proceeded by a '-' to indicate a negative number and may contain trailing,
+// non-decimal data. If |outp| is not NULL, it constructs a BIGNUM equal to the
+// decimal number and stores it in |*outp|. If |*outp| is NULL then it
+// allocates a new BIGNUM and updates |*outp|. It returns the number of bytes
+// of |in| processed or zero on error.
+OPENSSL_EXPORT int BN_dec2bn(BIGNUM **outp, const char *in);
+
+// BN_asc2bn acts like |BN_dec2bn| or |BN_hex2bn| depending on whether |in|
+// begins with "0X" or "0x" (indicating hex) or not (indicating decimal). A
+// leading '-' is still permitted and comes before the optional 0X/0x. It
+// returns one on success or zero on error.
+OPENSSL_EXPORT int BN_asc2bn(BIGNUM **outp, const char *in);
+
+// BN_print writes a hex encoding of |a| to |bio|. It returns one on success
+// and zero on error.
+OPENSSL_EXPORT int BN_print(BIO *bio, const BIGNUM *a);
+
+// BN_print_fp acts like |BIO_print|, but wraps |fp| in a |BIO| first.
+OPENSSL_EXPORT int BN_print_fp(FILE *fp, const BIGNUM *a);
+
+// BN_get_word returns the absolute value of |bn| as a single word. If |bn| is
+// too large to be represented as a single word, the maximum possible value
+// will be returned.
+OPENSSL_EXPORT BN_ULONG BN_get_word(const BIGNUM *bn);
+
+// BN_get_u64 sets |*out| to the absolute value of |bn| as a |uint64_t| and
+// returns one. If |bn| is too large to be represented as a |uint64_t|, it
+// returns zero.
+OPENSSL_EXPORT int BN_get_u64(const BIGNUM *bn, uint64_t *out);
+
+
+// ASN.1 functions.
+
+// BN_parse_asn1_unsigned parses a non-negative DER INTEGER from |cbs| writes
+// the result to |ret|. It returns one on success and zero on failure.
+OPENSSL_EXPORT int BN_parse_asn1_unsigned(CBS *cbs, BIGNUM *ret);
+
+// BN_marshal_asn1 marshals |bn| as a non-negative DER INTEGER and appends the
+// result to |cbb|. It returns one on success and zero on failure.
+OPENSSL_EXPORT int BN_marshal_asn1(CBB *cbb, const BIGNUM *bn);
+
+
+// BIGNUM pools.
+//
+// Certain BIGNUM operations need to use many temporary variables and
+// allocating and freeing them can be quite slow. Thus such operations typically
+// take a |BN_CTX| parameter, which contains a pool of |BIGNUMs|. The |ctx|
+// argument to a public function may be NULL, in which case a local |BN_CTX|
+// will be created just for the lifetime of that call.
+//
+// A function must call |BN_CTX_start| first. Then, |BN_CTX_get| may be called
+// repeatedly to obtain temporary |BIGNUM|s. All |BN_CTX_get| calls must be made
+// before calling any other functions that use the |ctx| as an argument.
+//
+// Finally, |BN_CTX_end| must be called before returning from the function.
+// When |BN_CTX_end| is called, the |BIGNUM| pointers obtained from
+// |BN_CTX_get| become invalid.
+
+// BN_CTX_new returns a new, empty BN_CTX or NULL on allocation failure.
+OPENSSL_EXPORT BN_CTX *BN_CTX_new(void);
+
+// BN_CTX_free frees all BIGNUMs contained in |ctx| and then frees |ctx|
+// itself.
+OPENSSL_EXPORT void BN_CTX_free(BN_CTX *ctx);
+
+// BN_CTX_start "pushes" a new entry onto the |ctx| stack and allows future
+// calls to |BN_CTX_get|.
+OPENSSL_EXPORT void BN_CTX_start(BN_CTX *ctx);
+
+// BN_CTX_get returns a new |BIGNUM|, or NULL on allocation failure. Once
+// |BN_CTX_get| has returned NULL, all future calls will also return NULL until
+// |BN_CTX_end| is called.
+OPENSSL_EXPORT BIGNUM *BN_CTX_get(BN_CTX *ctx);
+
+// BN_CTX_end invalidates all |BIGNUM|s returned from |BN_CTX_get| since the
+// matching |BN_CTX_start| call.
+OPENSSL_EXPORT void BN_CTX_end(BN_CTX *ctx);
+
+
+// Simple arithmetic
+
+// BN_add sets |r| = |a| + |b|, where |r| may be the same pointer as either |a|
+// or |b|. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+
+// BN_uadd sets |r| = |a| + |b|, where |a| and |b| are non-negative and |r| may
+// be the same pointer as either |a| or |b|. It returns one on success and zero
+// on allocation failure.
+OPENSSL_EXPORT int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+
+// BN_add_word adds |w| to |a|. It returns one on success and zero otherwise.
+OPENSSL_EXPORT int BN_add_word(BIGNUM *a, BN_ULONG w);
+
+// BN_sub sets |r| = |a| - |b|, where |r| may be the same pointer as either |a|
+// or |b|. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+
+// BN_usub sets |r| = |a| - |b|, where |a| and |b| are non-negative integers,
+// |b| < |a| and |r| may be the same pointer as either |a| or |b|. It returns
+// one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+
+// BN_sub_word subtracts |w| from |a|. It returns one on success and zero on
+// allocation failure.
+OPENSSL_EXPORT int BN_sub_word(BIGNUM *a, BN_ULONG w);
+
+// BN_mul sets |r| = |a| * |b|, where |r| may be the same pointer as |a| or
+// |b|. Returns one on success and zero otherwise.
+OPENSSL_EXPORT int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ BN_CTX *ctx);
+
+// BN_mul_word sets |bn| = |bn| * |w|. It returns one on success or zero on
+// allocation failure.
+OPENSSL_EXPORT int BN_mul_word(BIGNUM *bn, BN_ULONG w);
+
+// BN_sqr sets |r| = |a|^2 (i.e. squares), where |r| may be the same pointer as
+// |a|. Returns one on success and zero otherwise. This is more efficient than
+// BN_mul(r, a, a, ctx).
+OPENSSL_EXPORT int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx);
+
+// BN_div divides |numerator| by |divisor| and places the result in |quotient|
+// and the remainder in |rem|. Either of |quotient| or |rem| may be NULL, in
+// which case the respective value is not returned. The result is rounded
+// towards zero; thus if |numerator| is negative, the remainder will be zero or
+// negative. It returns one on success or zero on error.
+OPENSSL_EXPORT int BN_div(BIGNUM *quotient, BIGNUM *rem,
+ const BIGNUM *numerator, const BIGNUM *divisor,
+ BN_CTX *ctx);
+
+// BN_div_word sets |numerator| = |numerator|/|divisor| and returns the
+// remainder or (BN_ULONG)-1 on error.
+OPENSSL_EXPORT BN_ULONG BN_div_word(BIGNUM *numerator, BN_ULONG divisor);
+
+// BN_sqrt sets |*out_sqrt| (which may be the same |BIGNUM| as |in|) to the
+// square root of |in|, using |ctx|. It returns one on success or zero on
+// error. Negative numbers and non-square numbers will result in an error with
+// appropriate errors on the error queue.
+OPENSSL_EXPORT int BN_sqrt(BIGNUM *out_sqrt, const BIGNUM *in, BN_CTX *ctx);
+
+
+// Comparison functions
+
+// BN_cmp returns a value less than, equal to or greater than zero if |a| is
+// less than, equal to or greater than |b|, respectively.
+OPENSSL_EXPORT int BN_cmp(const BIGNUM *a, const BIGNUM *b);
+
+// BN_cmp_word is like |BN_cmp| except it takes its second argument as a
+// |BN_ULONG| instead of a |BIGNUM|.
+OPENSSL_EXPORT int BN_cmp_word(const BIGNUM *a, BN_ULONG b);
+
+// BN_ucmp returns a value less than, equal to or greater than zero if the
+// absolute value of |a| is less than, equal to or greater than the absolute
+// value of |b|, respectively.
+OPENSSL_EXPORT int BN_ucmp(const BIGNUM *a, const BIGNUM *b);
+
+// BN_equal_consttime returns one if |a| is equal to |b|, and zero otherwise.
+// It takes an amount of time dependent on the sizes of |a| and |b|, but
+// independent of the contents (including the signs) of |a| and |b|.
+OPENSSL_EXPORT int BN_equal_consttime(const BIGNUM *a, const BIGNUM *b);
+
+// BN_abs_is_word returns one if the absolute value of |bn| equals |w| and zero
+// otherwise.
+OPENSSL_EXPORT int BN_abs_is_word(const BIGNUM *bn, BN_ULONG w);
+
+// BN_is_zero returns one if |bn| is zero and zero otherwise.
+OPENSSL_EXPORT int BN_is_zero(const BIGNUM *bn);
+
+// BN_is_one returns one if |bn| equals one and zero otherwise.
+OPENSSL_EXPORT int BN_is_one(const BIGNUM *bn);
+
+// BN_is_word returns one if |bn| is exactly |w| and zero otherwise.
+OPENSSL_EXPORT int BN_is_word(const BIGNUM *bn, BN_ULONG w);
+
+// BN_is_odd returns one if |bn| is odd and zero otherwise.
+OPENSSL_EXPORT int BN_is_odd(const BIGNUM *bn);
+
+// BN_is_pow2 returns 1 if |a| is a power of two, and 0 otherwise.
+OPENSSL_EXPORT int BN_is_pow2(const BIGNUM *a);
+
+
+// Bitwise operations.
+
+// BN_lshift sets |r| equal to |a| << n. The |a| and |r| arguments may be the
+// same |BIGNUM|. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
+
+// BN_lshift1 sets |r| equal to |a| << 1, where |r| and |a| may be the same
+// pointer. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_lshift1(BIGNUM *r, const BIGNUM *a);
+
+// BN_rshift sets |r| equal to |a| >> n, where |r| and |a| may be the same
+// pointer. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_rshift(BIGNUM *r, const BIGNUM *a, int n);
+
+// BN_rshift1 sets |r| equal to |a| >> 1, where |r| and |a| may be the same
+// pointer. It returns one on success and zero on allocation failure.
+OPENSSL_EXPORT int BN_rshift1(BIGNUM *r, const BIGNUM *a);
+
+// BN_set_bit sets the |n|th, least-significant bit in |a|. For example, if |a|
+// is 2 then setting bit zero will make it 3. It returns one on success or zero
+// on allocation failure.
+OPENSSL_EXPORT int BN_set_bit(BIGNUM *a, int n);
+
+// BN_clear_bit clears the |n|th, least-significant bit in |a|. For example, if
+// |a| is 3, clearing bit zero will make it two. It returns one on success or
+// zero on allocation failure.
+OPENSSL_EXPORT int BN_clear_bit(BIGNUM *a, int n);
+
+// BN_is_bit_set returns one if the |n|th least-significant bit in |a| exists
+// and is set. Otherwise, it returns zero.
+OPENSSL_EXPORT int BN_is_bit_set(const BIGNUM *a, int n);
+
+// BN_mask_bits truncates |a| so that it is only |n| bits long. It returns one
+// on success or zero if |n| is negative.
+//
+// This differs from OpenSSL which additionally returns zero if |a|'s word
+// length is less than or equal to |n|, rounded down to a number of words. Note
+// word size is platform-dependent, so this behavior is also difficult to rely
+// on in OpenSSL and not very useful.
+OPENSSL_EXPORT int BN_mask_bits(BIGNUM *a, int n);
+
+// BN_count_low_zero_bits returns the number of low-order zero bits in |bn|, or
+// the number of factors of two which divide it. It returns zero if |bn| is
+// zero.
+OPENSSL_EXPORT int BN_count_low_zero_bits(const BIGNUM *bn);
+
+
+// Modulo arithmetic.
+
+// BN_mod_word returns |a| mod |w| or (BN_ULONG)-1 on error.
+OPENSSL_EXPORT BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
+
+// BN_mod_pow2 sets |r| = |a| mod 2^|e|. It returns 1 on success and
+// 0 on error.
+OPENSSL_EXPORT int BN_mod_pow2(BIGNUM *r, const BIGNUM *a, size_t e);
+
+// BN_nnmod_pow2 sets |r| = |a| mod 2^|e| where |r| is always positive.
+// It returns 1 on success and 0 on error.
+OPENSSL_EXPORT int BN_nnmod_pow2(BIGNUM *r, const BIGNUM *a, size_t e);
+
+// BN_mod is a helper macro that calls |BN_div| and discards the quotient.
+#define BN_mod(rem, numerator, divisor, ctx) \
+ BN_div(NULL, (rem), (numerator), (divisor), (ctx))
+
+// BN_nnmod is a non-negative modulo function. It acts like |BN_mod|, but 0 <=
+// |rem| < |divisor| is always true. It returns one on success and zero on
+// error.
+OPENSSL_EXPORT int BN_nnmod(BIGNUM *rem, const BIGNUM *numerator,
+ const BIGNUM *divisor, BN_CTX *ctx);
+
+// BN_mod_add sets |r| = |a| + |b| mod |m|. It returns one on success and zero
+// on error.
+OPENSSL_EXPORT int BN_mod_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ const BIGNUM *m, BN_CTX *ctx);
+
+// BN_mod_add_quick acts like |BN_mod_add| but requires that |a| and |b| be
+// non-negative and less than |m|.
+OPENSSL_EXPORT int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ const BIGNUM *m);
+
+// BN_mod_sub sets |r| = |a| - |b| mod |m|. It returns one on success and zero
+// on error.
+OPENSSL_EXPORT int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ const BIGNUM *m, BN_CTX *ctx);
+
+// BN_mod_sub_quick acts like |BN_mod_sub| but requires that |a| and |b| be
+// non-negative and less than |m|.
+OPENSSL_EXPORT int BN_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ const BIGNUM *m);
+
+// BN_mod_mul sets |r| = |a|*|b| mod |m|. It returns one on success and zero
+// on error.
+OPENSSL_EXPORT int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ const BIGNUM *m, BN_CTX *ctx);
+
+// BN_mod_sqr sets |r| = |a|^2 mod |m|. It returns one on success and zero
+// on error.
+OPENSSL_EXPORT int BN_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *m,
+ BN_CTX *ctx);
+
+// BN_mod_lshift sets |r| = (|a| << n) mod |m|, where |r| and |a| may be the
+// same pointer. It returns one on success and zero on error.
+OPENSSL_EXPORT int BN_mod_lshift(BIGNUM *r, const BIGNUM *a, int n,
+ const BIGNUM *m, BN_CTX *ctx);
+
+// BN_mod_lshift_quick acts like |BN_mod_lshift| but requires that |a| be
+// non-negative and less than |m|.
+OPENSSL_EXPORT int BN_mod_lshift_quick(BIGNUM *r, const BIGNUM *a, int n,
+ const BIGNUM *m);
+
+// BN_mod_lshift1 sets |r| = (|a| << 1) mod |m|, where |r| and |a| may be the
+// same pointer. It returns one on success and zero on error.
+OPENSSL_EXPORT int BN_mod_lshift1(BIGNUM *r, const BIGNUM *a, const BIGNUM *m,
+ BN_CTX *ctx);
+
+// BN_mod_lshift1_quick acts like |BN_mod_lshift1| but requires that |a| be
+// non-negative and less than |m|.
+OPENSSL_EXPORT int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a,
+ const BIGNUM *m);
+
+// BN_mod_sqrt returns a newly-allocated |BIGNUM|, r, such that
+// r^2 == a (mod p). |p| must be a prime. It returns NULL on error or if |a| is
+// not a square mod |p|. In the latter case, it will add |BN_R_NOT_A_SQUARE| to
+// the error queue.
+OPENSSL_EXPORT BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p,
+ BN_CTX *ctx);
+
+
+// Random and prime number generation.
+
+// The following are values for the |top| parameter of |BN_rand|.
+#define BN_RAND_TOP_ANY (-1)
+#define BN_RAND_TOP_ONE 0
+#define BN_RAND_TOP_TWO 1
+
+// The following are values for the |bottom| parameter of |BN_rand|.
+#define BN_RAND_BOTTOM_ANY 0
+#define BN_RAND_BOTTOM_ODD 1
+
+// BN_rand sets |rnd| to a random number of length |bits|. It returns one on
+// success and zero otherwise.
+//
+// |top| must be one of the |BN_RAND_TOP_*| values. If |BN_RAND_TOP_ONE|, the
+// most-significant bit, if any, will be set. If |BN_RAND_TOP_TWO|, the two
+// most significant bits, if any, will be set. If |BN_RAND_TOP_ANY|, no extra
+// action will be taken and |BN_num_bits(rnd)| may not equal |bits| if the most
+// significant bits randomly ended up as zeros.
+//
+// |bottom| must be one of the |BN_RAND_BOTTOM_*| values. If
+// |BN_RAND_BOTTOM_ODD|, the least-significant bit, if any, will be set. If
+// |BN_RAND_BOTTOM_ANY|, no extra action will be taken.
+OPENSSL_EXPORT int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
+
+// BN_pseudo_rand is an alias for |BN_rand|.
+OPENSSL_EXPORT int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
+
+// BN_rand_range is equivalent to |BN_rand_range_ex| with |min_inclusive| set
+// to zero and |max_exclusive| set to |range|.
+OPENSSL_EXPORT int BN_rand_range(BIGNUM *rnd, const BIGNUM *range);
+
+// BN_rand_range_ex sets |rnd| to a random value in
+// [min_inclusive..max_exclusive). It returns one on success and zero
+// otherwise.
+OPENSSL_EXPORT int BN_rand_range_ex(BIGNUM *r, BN_ULONG min_inclusive,
+ const BIGNUM *max_exclusive);
+
+// BN_pseudo_rand_range is an alias for BN_rand_range.
+OPENSSL_EXPORT int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
+
+// BN_GENCB holds a callback function that is used by generation functions that
+// can take a very long time to complete. Use |BN_GENCB_set| to initialise a
+// |BN_GENCB| structure.
+//
+// The callback receives the address of that |BN_GENCB| structure as its last
+// argument and the user is free to put an arbitrary pointer in |arg|. The other
+// arguments are set as follows:
+// event=BN_GENCB_GENERATED, n=i: after generating the i'th possible prime
+// number.
+// event=BN_GENCB_PRIME_TEST, n=-1: when finished trial division primality
+// checks.
+// event=BN_GENCB_PRIME_TEST, n=i: when the i'th primality test has finished.
+//
+// The callback can return zero to abort the generation progress or one to
+// allow it to continue.
+//
+// When other code needs to call a BN generation function it will often take a
+// BN_GENCB argument and may call the function with other argument values.
+#define BN_GENCB_GENERATED 0
+#define BN_GENCB_PRIME_TEST 1
+
+struct bn_gencb_st {
+ void *arg; // callback-specific data
+ int (*callback)(int event, int n, struct bn_gencb_st *);
+};
+
+// BN_GENCB_set configures |callback| to call |f| and sets |callout->arg| to
+// |arg|.
+OPENSSL_EXPORT void BN_GENCB_set(BN_GENCB *callback,
+ int (*f)(int event, int n,
+ struct bn_gencb_st *),
+ void *arg);
+
+// BN_GENCB_call calls |callback|, if not NULL, and returns the return value of
+// the callback, or 1 if |callback| is NULL.
+OPENSSL_EXPORT int BN_GENCB_call(BN_GENCB *callback, int event, int n);
+
+// BN_generate_prime_ex sets |ret| to a prime number of |bits| length. If safe
+// is non-zero then the prime will be such that (ret-1)/2 is also a prime.
+// (This is needed for Diffie-Hellman groups to ensure that the only subgroups
+// are of size 2 and (p-1)/2.).
+//
+// If |add| is not NULL, the prime will fulfill the condition |ret| % |add| ==
+// |rem| in order to suit a given generator. (If |rem| is NULL then |ret| %
+// |add| == 1.)
+//
+// If |cb| is not NULL, it will be called during processing to give an
+// indication of progress. See the comments for |BN_GENCB|. It returns one on
+// success and zero otherwise.
+OPENSSL_EXPORT int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,
+ const BIGNUM *add, const BIGNUM *rem,
+ BN_GENCB *cb);
+
+// BN_prime_checks is magic value that can be used as the |checks| argument to
+// the primality testing functions in order to automatically select a number of
+// Miller-Rabin checks that gives a false positive rate of ~2^{-80}.
+#define BN_prime_checks 0
+
+// bn_primality_result_t enumerates the outcomes of primality-testing.
+enum bn_primality_result_t {
+ bn_probably_prime,
+ bn_composite,
+ bn_non_prime_power_composite,
+};
+
+// BN_enhanced_miller_rabin_primality_test tests whether |w| is probably a prime
+// number using the Enhanced Miller-Rabin Test (FIPS 186-4 C.3.2) with
+// |iterations| iterations and returns the result in |out_result|. Enhanced
+// Miller-Rabin tests primality for odd integers greater than 3, returning
+// |bn_probably_prime| if the number is probably prime,
+// |bn_non_prime_power_composite| if the number is a composite that is not the
+// power of a single prime, and |bn_composite| otherwise. If |iterations| is
+// |BN_prime_checks|, then a value that results in a false positive rate lower
+// than the number-field sieve security level of |w| is used. It returns one on
+// success and zero on failure. If |cb| is not NULL, then it is called during
+// each iteration of the primality test.
+OPENSSL_EXPORT int BN_enhanced_miller_rabin_primality_test(
+ enum bn_primality_result_t *out_result, const BIGNUM *w, int iterations,
+ BN_CTX *ctx, BN_GENCB *cb);
+
+// BN_primality_test sets |*is_probably_prime| to one if |candidate| is
+// probably a prime number by the Miller-Rabin test or zero if it's certainly
+// not.
+//
+// If |do_trial_division| is non-zero then |candidate| will be tested against a
+// list of small primes before Miller-Rabin tests. The probability of this
+// function returning a false positive is 2^{2*checks}. If |checks| is
+// |BN_prime_checks| then a value that results in a false positive rate lower
+// than the number-field sieve security level of |candidate| is used. If |cb| is
+// not NULL then it is called during the checking process. See the comment above
+// |BN_GENCB|.
+//
+// The function returns one on success and zero on error.
+//
+// (If you are unsure whether you want |do_trial_division|, don't set it.)
+OPENSSL_EXPORT int BN_primality_test(int *is_probably_prime,
+ const BIGNUM *candidate, int checks,
+ BN_CTX *ctx, int do_trial_division,
+ BN_GENCB *cb);
+
+// BN_is_prime_fasttest_ex returns one if |candidate| is probably a prime
+// number by the Miller-Rabin test, zero if it's certainly not and -1 on error.
+//
+// If |do_trial_division| is non-zero then |candidate| will be tested against a
+// list of small primes before Miller-Rabin tests. The probability of this
+// function returning one when |candidate| is composite is 2^{2*checks}. If
+// |checks| is |BN_prime_checks| then a value that results in a false positive
+// rate lower than the number-field sieve security level of |candidate| is used.
+// If |cb| is not NULL then it is called during the checking process. See the
+// comment above |BN_GENCB|.
+//
+// WARNING: deprecated. Use |BN_primality_test|.
+OPENSSL_EXPORT int BN_is_prime_fasttest_ex(const BIGNUM *candidate, int checks,
+ BN_CTX *ctx, int do_trial_division,
+ BN_GENCB *cb);
+
+// BN_is_prime_ex acts the same as |BN_is_prime_fasttest_ex| with
+// |do_trial_division| set to zero.
+//
+// WARNING: deprecated: Use |BN_primality_test|.
+OPENSSL_EXPORT int BN_is_prime_ex(const BIGNUM *candidate, int checks,
+ BN_CTX *ctx, BN_GENCB *cb);
+
+
+// Number theory functions
+
+// BN_gcd sets |r| = gcd(|a|, |b|). It returns one on success and zero
+// otherwise.
+OPENSSL_EXPORT int BN_gcd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+ BN_CTX *ctx);
+
+// BN_mod_inverse sets |out| equal to |a|^-1, mod |n|. If |out| is NULL, a
+// fresh BIGNUM is allocated. It returns the result or NULL on error.
+//
+// If |n| is even then the operation is performed using an algorithm that avoids
+// some branches but which isn't constant-time. This function shouldn't be used
+// for secret values; use |BN_mod_inverse_blinded| instead. Or, if |n| is
+// guaranteed to be prime, use
+// |BN_mod_exp_mont_consttime(out, a, m_minus_2, m, ctx, m_mont)|, taking
+// advantage of Fermat's Little Theorem.
+OPENSSL_EXPORT BIGNUM *BN_mod_inverse(BIGNUM *out, const BIGNUM *a,
+ const BIGNUM *n, BN_CTX *ctx);
+
+// BN_mod_inverse_blinded sets |out| equal to |a|^-1, mod |n|, where |n| is the
+// Montgomery modulus for |mont|. |a| must be non-negative and must be less
+// than |n|. |n| must be greater than 1. |a| is blinded (masked by a random
+// value) to protect it against side-channel attacks. On failure, if the failure
+// was caused by |a| having no inverse mod |n| then |*out_no_inverse| will be
+// set to one; otherwise it will be set to zero.
+//
+// Note this function may incorrectly report |a| has no inverse if the random
+// blinding value has no inverse. It should only be used when |n| has few
+// non-invertible elements, such as an RSA modulus.
+int BN_mod_inverse_blinded(BIGNUM *out, int *out_no_inverse, const BIGNUM *a,
+ const BN_MONT_CTX *mont, BN_CTX *ctx);
+
+// BN_mod_inverse_odd sets |out| equal to |a|^-1, mod |n|. |a| must be
+// non-negative and must be less than |n|. |n| must be odd. This function
+// shouldn't be used for secret values; use |BN_mod_inverse_blinded| instead.
+// Or, if |n| is guaranteed to be prime, use
+// |BN_mod_exp_mont_consttime(out, a, m_minus_2, m, ctx, m_mont)|, taking
+// advantage of Fermat's Little Theorem. It returns one on success or zero on
+// failure. On failure, if the failure was caused by |a| having no inverse mod
+// |n| then |*out_no_inverse| will be set to one; otherwise it will be set to
+// zero.
+int BN_mod_inverse_odd(BIGNUM *out, int *out_no_inverse, const BIGNUM *a,
+ const BIGNUM *n, BN_CTX *ctx);
+
+
+// Montgomery arithmetic.
+
+// BN_MONT_CTX contains the precomputed values needed to work in a specific
+// Montgomery domain.
+
+// BN_MONT_CTX_new_for_modulus returns a fresh |BN_MONT_CTX| given the modulus,
+// |mod| or NULL on error.
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_new_for_modulus(const BIGNUM *mod,
+ BN_CTX *ctx);
+
+// BN_MONT_CTX_free frees memory associated with |mont|.
+OPENSSL_EXPORT void BN_MONT_CTX_free(BN_MONT_CTX *mont);
+
+// BN_MONT_CTX_copy sets |to| equal to |from|. It returns |to| on success or
+// NULL on error.
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to,
+ const BN_MONT_CTX *from);
+
+// BN_MONT_CTX_set_locked takes |lock| and checks whether |*pmont| is NULL. If
+// so, it creates a new |BN_MONT_CTX| and sets the modulus for it to |mod|. It
+// then stores it as |*pmont|. It returns one on success and zero on error.
+//
+// If |*pmont| is already non-NULL then it does nothing and returns one.
+int BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, CRYPTO_MUTEX *lock,
+ const BIGNUM *mod, BN_CTX *bn_ctx);
+
+// BN_to_montgomery sets |ret| equal to |a| in the Montgomery domain. |a| is
+// assumed to be in the range [0, n), where |n| is the Montgomery modulus. It
+// returns one on success or zero on error.
+OPENSSL_EXPORT int BN_to_montgomery(BIGNUM *ret, const BIGNUM *a,
+ const BN_MONT_CTX *mont, BN_CTX *ctx);
+
+// BN_from_montgomery sets |ret| equal to |a| * R^-1, i.e. translates values out
+// of the Montgomery domain. |a| is assumed to be in the range [0, n), where |n|
+// is the Montgomery modulus. It returns one on success or zero on error.
+OPENSSL_EXPORT int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a,
+ const BN_MONT_CTX *mont, BN_CTX *ctx);
+
+// BN_mod_mul_montgomery set |r| equal to |a| * |b|, in the Montgomery domain.
+// Both |a| and |b| must already be in the Montgomery domain (by
+// |BN_to_montgomery|). In particular, |a| and |b| are assumed to be in the
+// range [0, n), where |n| is the Montgomery modulus. It returns one on success
+// or zero on error.
+OPENSSL_EXPORT int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a,
+ const BIGNUM *b,
+ const BN_MONT_CTX *mont, BN_CTX *ctx);
+
+
+// Exponentiation.
+
+// BN_exp sets |r| equal to |a|^{|p|}. It does so with a square-and-multiply
+// algorithm that leaks side-channel information. It returns one on success or
+// zero otherwise.
+OPENSSL_EXPORT int BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+ BN_CTX *ctx);
+
+// BN_mod_exp sets |r| equal to |a|^{|p|} mod |m|. It does so with the best
+// algorithm for the values provided. It returns one on success or zero
+// otherwise. The |BN_mod_exp_mont_consttime| variant must be used if the
+// exponent is secret.
+OPENSSL_EXPORT int BN_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx);
+
+OPENSSL_EXPORT int BN_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ const BN_MONT_CTX *mont);
+
+OPENSSL_EXPORT int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a,
+ const BIGNUM *p, const BIGNUM *m,
+ BN_CTX *ctx,
+ const BN_MONT_CTX *mont);
+
+
+// Deprecated functions
+
+// BN_bn2mpi serialises the value of |in| to |out|, using a format that consists
+// of the number's length in bytes represented as a 4-byte big-endian number,
+// and the number itself in big-endian format, where the most significant bit
+// signals a negative number. (The representation of numbers with the MSB set is
+// prefixed with null byte). |out| must have sufficient space available; to
+// find the needed amount of space, call the function with |out| set to NULL.
+OPENSSL_EXPORT size_t BN_bn2mpi(const BIGNUM *in, uint8_t *out);
+
+// BN_mpi2bn parses |len| bytes from |in| and returns the resulting value. The
+// bytes at |in| are expected to be in the format emitted by |BN_bn2mpi|.
+//
+// If |out| is NULL then a fresh |BIGNUM| is allocated and returned, otherwise
+// |out| is reused and returned. On error, NULL is returned and the error queue
+// is updated.
+OPENSSL_EXPORT BIGNUM *BN_mpi2bn(const uint8_t *in, size_t len, BIGNUM *out);
+
+// BN_mod_exp_mont_word is like |BN_mod_exp_mont| except that the base |a| is
+// given as a |BN_ULONG| instead of a |BIGNUM *|. It returns one on success
+// or zero otherwise.
+OPENSSL_EXPORT int BN_mod_exp_mont_word(BIGNUM *r, BN_ULONG a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ const BN_MONT_CTX *mont);
+
+// BN_mod_exp2_mont calculates (a1^p1) * (a2^p2) mod m. It returns 1 on success
+// or zero otherwise.
+OPENSSL_EXPORT int BN_mod_exp2_mont(BIGNUM *r, const BIGNUM *a1,
+ const BIGNUM *p1, const BIGNUM *a2,
+ const BIGNUM *p2, const BIGNUM *m,
+ BN_CTX *ctx, const BN_MONT_CTX *mont);
+
+// BN_MONT_CTX_new returns a fresh |BN_MONT_CTX| or NULL on allocation failure.
+// Use |BN_MONT_CTX_new_for_modulus| instead.
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_new(void);
+
+// BN_MONT_CTX_set sets up a Montgomery context given the modulus, |mod|. It
+// returns one on success and zero on error. Use |BN_MONT_CTX_new_for_modulus|
+// instead.
+OPENSSL_EXPORT int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod,
+ BN_CTX *ctx);
+
+
+// Private functions
+
+struct bignum_st {
+ // d is a pointer to an array of |width| |BN_BITS2|-bit chunks in
+ // little-endian order. This stores the absolute value of the number.
+ BN_ULONG *d;
+ // width is the number of elements of |d| which are valid. This value is not
+ // necessarily minimal; the most-significant words of |d| may be zero.
+ // |width| determines a potentially loose upper-bound on the absolute value
+ // of the |BIGNUM|.
+ //
+ // Functions taking |BIGNUM| inputs must compute the same answer for all
+ // possible widths. |bn_minimal_width|, |bn_set_minimal_width|, and other
+ // helpers may be used to recover the minimal width, provided it is not
+ // secret. If it is secret, use a different algorithm. Functions may output
+ // minimal or non-minimal |BIGNUM|s depending on secrecy requirements, but
+ // those which cause widths to unboundedly grow beyond the minimal value
+ // should be documented such.
+ //
+ // Note this is different from historical |BIGNUM| semantics.
+ int width;
+ // dmax is number of elements of |d| which are allocated.
+ int dmax;
+ // neg is one if the number if negative and zero otherwise.
+ int neg;
+ // flags is a bitmask of |BN_FLG_*| values
+ int flags;
+};
+
+struct bn_mont_ctx_st {
+ // RR is R^2, reduced modulo |N|. It is used to convert to Montgomery form.
+ BIGNUM RR;
+ // N is the modulus. It is always stored in minimal form, so |N.top|
+ // determines R.
+ BIGNUM N;
+ BN_ULONG n0[2]; // least significant words of (R*Ri-1)/N
+};
+
+OPENSSL_EXPORT unsigned BN_num_bits_word(BN_ULONG l);
+
+#define BN_FLG_MALLOCED 0x01
+#define BN_FLG_STATIC_DATA 0x02
+// |BN_FLG_CONSTTIME| has been removed and intentionally omitted so code relying
+// on it will not compile. Consumers outside BoringSSL should use the
+// higher-level cryptographic algorithms exposed by other modules. Consumers
+// within the library should call the appropriate timing-sensitive algorithm
+// directly.
+
+
+#if defined(__cplusplus)
+} // extern C
+
+#if !defined(BORINGSSL_NO_CXX)
+extern "C++" {
+
+namespace bssl {
+
+BORINGSSL_MAKE_DELETER(BIGNUM, BN_free)
+BORINGSSL_MAKE_DELETER(BN_CTX, BN_CTX_free)
+BORINGSSL_MAKE_DELETER(BN_MONT_CTX, BN_MONT_CTX_free)
+
+class BN_CTXScope {
+ public:
+ BN_CTXScope(BN_CTX *ctx) : ctx_(ctx) { BN_CTX_start(ctx_); }
+ ~BN_CTXScope() { BN_CTX_end(ctx_); }
+
+ private:
+ BN_CTX *ctx_;
+
+ BN_CTXScope(BN_CTXScope &) = delete;
+ BN_CTXScope &operator=(BN_CTXScope &) = delete;
+};
+
+} // namespace bssl
+
+} // extern C++
+#endif
+
+#endif
+
+#define BN_R_ARG2_LT_ARG3 100
+#define BN_R_BAD_RECIPROCAL 101
+#define BN_R_BIGNUM_TOO_LONG 102
+#define BN_R_BITS_TOO_SMALL 103
+#define BN_R_CALLED_WITH_EVEN_MODULUS 104
+#define BN_R_DIV_BY_ZERO 105
+#define BN_R_EXPAND_ON_STATIC_BIGNUM_DATA 106
+#define BN_R_INPUT_NOT_REDUCED 107
+#define BN_R_INVALID_RANGE 108
+#define BN_R_NEGATIVE_NUMBER 109
+#define BN_R_NOT_A_SQUARE 110
+#define BN_R_NOT_INITIALIZED 111
+#define BN_R_NO_INVERSE 112
+#define BN_R_PRIVATE_KEY_TOO_LARGE 113
+#define BN_R_P_IS_NOT_PRIME 114
+#define BN_R_TOO_MANY_ITERATIONS 115
+#define BN_R_TOO_MANY_TEMPORARY_VARIABLES 116
+#define BN_R_BAD_ENCODING 117
+#define BN_R_ENCODE_ERROR 118
+#define BN_R_INVALID_INPUT 119
+
+#endif // OPENSSL_HEADER_BN_H
git://repos.xcallymotion.com / motion2.git / blobdiff