Add visibility rules.

This change marks public symbols as dynamically exported. This means
that it becomes viable to build a shared library of libcrypto and libssl
with -fvisibility=hidden.

On Windows, one not only needs to mark functions for export in a
component, but also for import when using them from a different
component. Because of this we have to build with
|BORINGSSL_IMPLEMENTATION| defined when building the code. Other
components, when including our headers, won't have that defined and then
the |OPENSSL_EXPORT| tag becomes an import tag instead. See the #defines
in base.h

In the asm code, symbols are now hidden by default and those that need
to be exported are wrapped by a C function.

In order to support Chromium, a couple of libssl functions were moved to
ssl.h from ssl_locl.h: ssl_get_new_session and ssl_update_cache.

Change-Id: Ib4b76e2f1983ee066e7806c24721e8626d08a261
Reviewed-on: https://boringssl-review.googlesource.com/1350
Reviewed-by: Adam Langley <agl@google.com>

1 files changed, 156 insertions, 135 deletions

diff --git a/include/openssl/bn.h b/include/openssl/bn.h
index 1635aabd..d9863941 100644
--- a/include/openssl/bn.h
+++ b/include/openssl/bn.h
@@ -152,72 +152,72 @@ extern "C" {
 /* Allocation and freeing. */
 
 /* BN_new creates a new, allocated BIGNUM and initialises it. */
-BIGNUM *BN_new(void);
+OPENSSL_EXPORT BIGNUM *BN_new(void);
 
 /* BN_init initialises a stack allocated |BIGNUM|. */
-void BN_init(BIGNUM *bn);
+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. */
-void BN_free(BIGNUM *bn);
+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. */
-void BN_clear_free(BIGNUM *bn);
+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. */
-BIGNUM *BN_dup(const BIGNUM *src);
+OPENSSL_EXPORT BIGNUM *BN_dup(const BIGNUM *src);
 
 /* BN_copy sets |dest| equal to |src| and returns |dest|. */
-BIGNUM *BN_copy(BIGNUM *dest, const BIGNUM *src);
+OPENSSL_EXPORT BIGNUM *BN_copy(BIGNUM *dest, const BIGNUM *src);
 
 /* BN_clear sets |bn| to zero and erases the old data. */
-void BN_clear(BIGNUM *bn);
+OPENSSL_EXPORT void BN_clear(BIGNUM *bn);
 
 /* BN_value_one returns a static BIGNUM with value 1. */
-const BIGNUM *BN_value_one(void);
+OPENSSL_EXPORT const BIGNUM *BN_value_one(void);
 
 /* BN_with_flags initialises a stack allocated |BIGNUM| with pointers to the
  * contents of |in| but with |flags| ORed into the flags field.
  *
  * Note: the two BIGNUMs share state and so |out| should /not/ be passed to
  * |BN_free|. */
-void BN_with_flags(BIGNUM *out, const BIGNUM *in, int flags);
+OPENSSL_EXPORT void BN_with_flags(BIGNUM *out, const BIGNUM *in, int flags);
 
 
 /* Basic functions. */
 
 /* BN_num_bits returns the minimum number of bits needed to represent the
  * absolute value of |bn|. */
-unsigned BN_num_bits(const BIGNUM *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|. */
-unsigned BN_num_bytes(const BIGNUM *bn);
+OPENSSL_EXPORT unsigned BN_num_bytes(const BIGNUM *bn);
 
 /* BN_zero sets |bn| to zero. */
-void BN_zero(BIGNUM *bn);
+OPENSSL_EXPORT void BN_zero(BIGNUM *bn);
 
 /* BN_one sets |bn| to one. It returns one on success or zero on allocation
  * failure. */
-int BN_one(BIGNUM *bn);
+OPENSSL_EXPORT int BN_one(BIGNUM *bn);
 
 /* BN_set_word sets |bn| to |value|. It returns one on success or zero on
  * allocation failure. */
-int BN_set_word(BIGNUM *bn, BN_ULONG value);
+OPENSSL_EXPORT int BN_set_word(BIGNUM *bn, BN_ULONG value);
 
 /* BN_set_negative sets the sign of |bn|. */
-void BN_set_negative(BIGNUM *bn, int sign);
+OPENSSL_EXPORT void BN_set_negative(BIGNUM *bn, int sign);
 
 /* BN_is_negative returns one if |bn| is negative and zero otherwise. */
-int BN_is_negative(const BIGNUM *bn);
+OPENSSL_EXPORT int BN_is_negative(const BIGNUM *bn);
 
 /* BN_get_flags returns |bn->flags| & |flags|. */
-int BN_get_flags(const BIGNUM *bn, int flags);
+OPENSSL_EXPORT int BN_get_flags(const BIGNUM *bn, int flags);
 
 /* BN_set_flags sets |flags| on |bn|. */
-void BN_set_flags(BIGNUM *bn, int flags);
+OPENSSL_EXPORT void BN_set_flags(BIGNUM *bn, int flags);
 
 
 /* Conversion functions. */
@@ -226,23 +226,23 @@ void BN_set_flags(BIGNUM *bn, int flags);
  * 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. */
-BIGNUM *BN_bin2bn(const uint8_t *in, size_t len, BIGNUM *ret);
+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. */
-size_t BN_bn2bin(const BIGNUM *in, uint8_t *out);
+OPENSSL_EXPORT size_t BN_bn2bin(const BIGNUM *in, uint8_t *out);
 
 /* 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. */
-int BN_bn2bin_padded(uint8_t *out, size_t len, const BIGNUM *in);
+OPENSSL_EXPORT int BN_bn2bin_padded(uint8_t *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. */
-char *BN_bn2hex(const BIGNUM *bn);
+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.
@@ -250,12 +250,12 @@ char *BN_bn2hex(const BIGNUM *bn);
  * 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. */
-int BN_hex2bn(BIGNUM **outp, const char *in);
+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. */
-char *BN_bn2dec(const BIGNUM *a);
+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,
@@ -263,25 +263,25 @@ char *BN_bn2dec(const BIGNUM *a);
  * 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. */
-int BN_dec2bn(BIGNUM **outp, const char *in);
+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. */
-int BN_asc2bn(BIGNUM **outp, const char *in);
+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. */
-int BN_print(BIO *bio, const BIGNUM *a);
+OPENSSL_EXPORT int BN_print(BIO *bio, const BIGNUM *a);
 
 /* BN_print_fp acts like |BIO_print|, but wraps |fp| in a |BIO| first. */
-int BN_print_fp(FILE *fp, const BIGNUM *a);
+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. */
-BN_ULONG BN_get_word(const BIGNUM *bn);
+OPENSSL_EXPORT BN_ULONG BN_get_word(const BIGNUM *bn);
 
 
 /* BIGNUM pools.
@@ -301,154 +301,156 @@ BN_ULONG BN_get_word(const BIGNUM *bn);
  * |BN_CTX_get| become invalid. */
 
 /* BN_CTX_new returns a new, empty BN_CTX or NULL on allocation failure. */
-BN_CTX *BN_CTX_new(void);
+OPENSSL_EXPORT BN_CTX *BN_CTX_new(void);
 
 /* BN_CTX_free frees all BIGNUMs contained in |ctx| and then frees |ctx|
  * itself. */
-void BN_CTX_free(BN_CTX *ctx);
+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|. */
-void BN_CTX_start(BN_CTX *ctx);
+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. */
-BIGNUM *BN_CTX_get(BN_CTX *ctx);
+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. */
-void BN_CTX_end(BN_CTX *ctx);
+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. */
-int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+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. */
-int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+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. */
-int BN_add_word(BIGNUM *a, BN_ULONG w);
+OPENSSL_EXPORT int BN_add_word(BIGNUM *a, BN_ULONG w);
 
 /* BN_sub sets |r| = |a| + |b|, where |r| must be a distinct pointer from |a|
  * and |b|. It returns one on success and zero on allocation failure. */
-int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+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| must be a distinct pointer from |a| and |b|. It returns
  * one on success and zero on allocation failure. */
-int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b);
+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. */
-int BN_sub_word(BIGNUM *a, BN_ULONG w);
+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. */
-int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
+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. */
-int BN_mul_word(BIGNUM *bn, BN_ULONG w);
+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). */
-int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *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. */
-int BN_div(BIGNUM *quotient, BIGNUM *rem, const BIGNUM *numerator,
-           const BIGNUM *divisor, BN_CTX *ctx);
+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. */
-BN_ULONG BN_div_word(BIGNUM *numerator, BN_ULONG divisor);
+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. */
-int BN_sqrt(BIGNUM *out_sqrt, const BIGNUM *in, BN_CTX *ctx);
+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. */
-int BN_cmp(const BIGNUM *a, const BIGNUM *b);
+OPENSSL_EXPORT int BN_cmp(const BIGNUM *a, const BIGNUM *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. */
-int BN_ucmp(const BIGNUM *a, const BIGNUM *b);
+OPENSSL_EXPORT int BN_ucmp(const BIGNUM *a, const BIGNUM *b);
 
 /* BN_abs_is_word returns one if the absolute value of |bn| equals |w| and zero
  * otherwise. */
-int BN_abs_is_word(const BIGNUM *bn, BN_ULONG w);
+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. */
-int BN_is_zero(const BIGNUM *bn);
+OPENSSL_EXPORT int BN_is_zero(const BIGNUM *bn);
 
 /* BN_is_one returns one if |bn| equals one and zero otherwise. */
-int BN_is_one(const BIGNUM *bn);
+OPENSSL_EXPORT int BN_is_one(const BIGNUM *bn);
 
 /* BN_is_word returns one if |bn| is exactly |w| and zero otherwise. */
-int BN_is_word(const BIGNUM *bn, BN_ULONG w);
+OPENSSL_EXPORT int BN_is_word(const BIGNUM *bn, BN_ULONG w);
 
 /* BN_is_odd returns one if |bn| is odd and zero otherwise. */
-int BN_is_odd(const BIGNUM *bn);
+OPENSSL_EXPORT int BN_is_odd(const BIGNUM *bn);
 
 
 /* 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. */
-int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
+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. */
-int BN_lshift1(BIGNUM *r, const BIGNUM *a);
+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. */
-int BN_rshift(BIGNUM *r, const BIGNUM *a, int n);
+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. */
-int BN_rshift1(BIGNUM *r, const BIGNUM *a);
+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. */
-int BN_set_bit(BIGNUM *a, int n);
+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. */
-int BN_clear_bit(BIGNUM *a, int n);
+OPENSSL_EXPORT int BN_clear_bit(BIGNUM *a, int n);
 
 /* BN_is_bit_set returns the value of the |n|th, least-significant bit in |a|,
  * or zero if the bit doesn't exist. */
-int BN_is_bit_set(const BIGNUM *a, int n);
+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 greater than the length of |a| already. */
-int BN_mask_bits(BIGNUM *a, int n);
+OPENSSL_EXPORT int BN_mask_bits(BIGNUM *a, int n);
 
 
 /* Modulo arithmetic. */
 
 /* BN_mod_word returns |a| mod |w|. */
-BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
+OPENSSL_EXPORT BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
 
 /* BN_mod is a helper macro that calls |BN_div| and discards the quotient. */
 #define BN_mod(rem, numerator, divisor, ctx) \
@@ -456,57 +458,62 @@ BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
 
 /* BN_nnmod is a non-negative modulo function. It acts like |BN_mod|, but 0 <=
  * |rem| < |divisor| is always true. */
-int BN_nnmod(BIGNUM *rem, const BIGNUM *numerator, const BIGNUM *divisor,
-             BN_CTX *ctx);
+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. */
-int BN_mod_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
-               BN_CTX *ctx);
+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|. */
-int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
-                     const BIGNUM *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. */
-int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
-               BN_CTX *ctx);
+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|. */
-int BN_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
-                     const BIGNUM *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. */
-int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
-               BN_CTX *ctx);
+OPENSSL_EXPORT int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+                              const BIGNUM *m, BN_CTX *ctx);
 
 /* BN_mod_mul sets |r| = |a|^2 mod |m|. It returns one on success and zero
  * on error. */
-int BN_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx);
+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. */
-int BN_mod_lshift(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *m,
-                  BN_CTX *ctx);
+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|. */
-int BN_mod_lshift_quick(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *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. */
-int BN_mod_lshift1(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx);
+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|. */
-int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m);
+OPENSSL_EXPORT int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a,
+                                        const BIGNUM *m);
 
 /* BN_mod_sqrt returns a |BIGNUM|, r, such that r^2 == a (mod p). */
-BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx);
+OPENSSL_EXPORT BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p,
+                                   BN_CTX *ctx);
 
 
 /* Random and prime number generation. */
@@ -520,17 +527,17 @@ BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx);
  *
  * If |bottom| is non-zero, the least-significant bit will be set. The function
  * returns one on success or zero otherwise. */
-int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
+OPENSSL_EXPORT int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
 
 /* BN_pseudo_rand is an alias for |BN_rand|. */
-int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
+OPENSSL_EXPORT int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
 
 /* BN_rand_range sets |rnd| to a random value [0..range). It returns one on
  * success and zero otherwise. */
-int BN_rand_range(BIGNUM *rnd, const BIGNUM *range);
+OPENSSL_EXPORT int BN_rand_range(BIGNUM *rnd, const BIGNUM *range);
 
 /* BN_pseudo_rand_range is an alias for BN_rand_range. */
-int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
+OPENSSL_EXPORT int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
 
 /* BN_generate_dsa_nonce generates a random number 0 <= out < range. Unlike
  * BN_rand_range, it also includes the contents of |priv| and |message| in the
@@ -538,9 +545,10 @@ int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
  * secret. This is intended for use in DSA and ECDSA where an RNG weakness
  * leads directly to private key exposure unless this function is used.
  * It returns one on success and zero on error. */
-int BN_generate_dsa_nonce(BIGNUM *out, const BIGNUM *range, const BIGNUM *priv,
-                          const uint8_t *message, size_t message_len,
-                          BN_CTX *ctx);
+OPENSSL_EXPORT int BN_generate_dsa_nonce(BIGNUM *out, const BIGNUM *range,
+                                         const BIGNUM *priv,
+                                         const uint8_t *message,
+                                         size_t message_len, BN_CTX *ctx);
 
 /* 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
@@ -570,13 +578,14 @@ struct bn_gencb_st {
 
 /* BN_GENCB_set configures |callback| to call |f| and sets |callout->arg| to
  * |arg|. */
-void BN_GENCB_set(BN_GENCB *callback,
-                  int (*f)(int event, int n, struct bn_gencb_st *),
-                  void *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. */
-int BN_GENCB_call(BN_GENCB *callback, int event, int n);
+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.
@@ -590,8 +599,9 @@ int BN_GENCB_call(BN_GENCB *callback, int event, int n);
  * 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. */
-int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe, const BIGNUM *add,
-                         const BIGNUM *rem, BN_GENCB *cb);
+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
@@ -612,9 +622,10 @@ int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe, const BIGNUM *add,
  * The function returns one on success and zero on error.
  *
  * (If you are unsure whether you want |do_trial_division|, don't set it.) */
-int BN_primality_test(int *is_probably_prime, const BIGNUM *candidate,
-                      int checks, BN_CTX *ctx, int do_trial_division,
-                      BN_GENCB *cb);
+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.
@@ -627,33 +638,35 @@ int BN_primality_test(int *is_probably_prime, const BIGNUM *candidate,
  * called during the checking process. See the comment above |BN_GENCB|.
  *
  * WARNING: deprecated. Use |BN_primality_test|. */
-int BN_is_prime_fasttest_ex(const BIGNUM *candidate, int checks, BN_CTX *ctx,
-                            int do_trial_division, BN_GENCB *cb);
+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|. */
-int BN_is_prime_ex(const BIGNUM *candidate, int checks, BN_CTX *ctx,
-                   BN_GENCB *cb);
+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. */
-int BN_gcd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
+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 either of |a| or |n|
  * have |BN_FLG_CONSTTIME| set then the operation is performed in constant
  * time. If |out| is NULL, a fresh BIGNUM is allocated. It returns the result
  * or NULL on error. */
-BIGNUM *BN_mod_inverse(BIGNUM *out, const BIGNUM *a, const BIGNUM *n,
-                       BN_CTX *ctx);
+OPENSSL_EXPORT BIGNUM *BN_mod_inverse(BIGNUM *out, const BIGNUM *a,
+                                      const BIGNUM *n, BN_CTX *ctx);
 
 /* BN_kronecker returns the Kronecker symbol of |a| and |b| (which is -1, 0 or
  * 1), or -2 on error. */
-int BN_kronecker(const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
+OPENSSL_EXPORT int BN_kronecker(const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
 
 
 /* Montgomery arithmetic. */
@@ -662,22 +675,24 @@ int BN_kronecker(const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
  * Montgomery domain. */
 
 /* BN_MONT_CTX_new returns a fresh BN_MONT_CTX or NULL on allocation failure. */
-BN_MONT_CTX *BN_MONT_CTX_new(void);
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_new(void);
 
 /* BN_MONT_CTX_init initialises a stack allocated |BN_MONT_CTX|. */
-void BN_MONT_CTX_init(BN_MONT_CTX *mont);
+OPENSSL_EXPORT void BN_MONT_CTX_init(BN_MONT_CTX *mont);
 
 /* BN_MONT_CTX_free frees the contexts of |mont| and, if it was originally
  * allocated with |BN_MONT_CTX_new|, |mont| itself. */
-void BN_MONT_CTX_free(BN_MONT_CTX *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. */
-BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from);
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to,
+                                             BN_MONT_CTX *from);
 
 /* BN_MONT_CTX_set sets up a Montgomery context given the modulus, |mod|. It
  * returns one on success and zero on error. */
-int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx);
+OPENSSL_EXPORT int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod,
+                                   BN_CTX *ctx);
 
 /* BN_MONT_CTX_set_locked takes the lock indicated by |lock| and checks whether
  * |*pmont| is NULL. If so, it creates a new |BN_MONT_CTX| and sets the modulus
@@ -685,24 +700,26 @@ int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx);
  * error.
  *
  * If |*pmont| is already non-NULL then the existing value is returned. */
-BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock,
-                                    const BIGNUM *mod, BN_CTX *ctx);
+OPENSSL_EXPORT BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont,
+                                                   int lock, const BIGNUM *mod,
+                                                   BN_CTX *ctx);
 
 /* BN_to_montgomery sets |ret| equal to |a| in the Montgomery domain. It
  * returns one on success and zero on error. */
-int BN_to_montgomery(BIGNUM *ret, const BIGNUM *a, const BN_MONT_CTX *mont,
-                     BN_CTX *ctx);
+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. It returns one on success or zero on error. */
-int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, const BN_MONT_CTX *mont,
-                       BN_CTX *ctx);
+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|). It returns one on success or zero on error. */
-int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
-                          const BN_MONT_CTX *mont, BN_CTX *ctx);
+OPENSSL_EXPORT int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a,
+                                         const BIGNUM *b,
+                                         const BN_MONT_CTX *mont, BN_CTX *ctx);
 
 
 /* Exponentiation. */
@@ -710,27 +727,31 @@ int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
 /* 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. */
-int BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx);
+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 and can run in constant time if
  * |BN_FLG_CONSTTIME| is set for |p|. It returns one on success or zero
  * otherwise. */
-int BN_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m,
-               BN_CTX *ctx);
-
-int BN_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-                    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
-
-int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
-                              const BIGNUM *m, BN_CTX *ctx,
-                              BN_MONT_CTX *in_mont);
-
-int BN_mod_exp_mont_word(BIGNUM *r, BN_ULONG a, const BIGNUM *p,
-                         const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
-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, BN_MONT_CTX *m_ctx);
+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,
+                                   BN_MONT_CTX *m_ctx);
+
+OPENSSL_EXPORT int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a,
+                                             const BIGNUM *p, const BIGNUM *m,
+                                             BN_CTX *ctx, BN_MONT_CTX *in_mont);
+
+OPENSSL_EXPORT int BN_mod_exp_mont_word(BIGNUM *r, BN_ULONG a, const BIGNUM *p,
+                                        const BIGNUM *m, BN_CTX *ctx,
+                                        BN_MONT_CTX *m_ctx);
+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, BN_MONT_CTX *m_ctx);
 
 
 /* Private functions */