Merge pull request #138 from libtom/relicense

Re-license

LICENSE

@@ -1,29 +1,26 @@
-LibTomMath is licensed under DUAL licensing terms.
+                          The LibTom license
 
-Choose and use the license of your needs.
+This is free and unencumbered software released into the public domain.
 
-[LICENSE #1]
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
 
-LibTomMath is public domain.  As should all quality software be.
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
 
-Tom St Denis
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
 
-[/LICENSE #1]
-
-[LICENSE #2]
-
-            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
-                    Version 2, December 2004
-
- Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
-
- Everyone is permitted to copy and distribute verbatim or modified
- copies of this license document, and changing it is allowed as long
- as the name is changed.
-
-            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. You just DO WHAT THE FUCK YOU WANT TO. 
-
-[/LICENSE #2]
+For more information, please refer to <http://unlicense.org/>

bn_error.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 static const struct {

bn_fast_mp_invmod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes the modular inverse via binary extended euclidean algorithm,

bn_fast_mp_montgomery_reduce.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes xR**-1 == x (mod N) via Montgomery Reduction

bn_fast_s_mp_mul_digs.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Fast (comba) multiplier

bn_fast_s_mp_mul_high_digs.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* this is a modified version of fast_s_mul_digs that only produces

bn_fast_s_mp_sqr.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* the jist of squaring...

bn_mp_2expt.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes a = 2**b

bn_mp_abs.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* b = |a|

bn_mp_add.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* high level addition (handles signs) */

bn_mp_add_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* single digit addition */

bn_mp_addmod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* d = a + b (mod c) */

bn_mp_and.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* AND two ints together */

bn_mp_clamp.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* trim unused digits

bn_mp_clear.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* clear one (frees)  */

bn_mp_clear_multi.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 #include <stdarg.h>

bn_mp_cmp.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* compare two ints (signed)*/

bn_mp_cmp_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* compare a digit */

bn_mp_cmp_mag.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* compare maginitude of two ints (unsigned) */

bn_mp_cnt_lsb.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 static const int lnz[16] = {

bn_mp_complement.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* b = ~a */

bn_mp_copy.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* copy, b = a */

bn_mp_count_bits.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* returns the number of bits in an int */

bn_mp_div.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 #ifdef BN_MP_DIV_SMALL

bn_mp_div_2.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* b = a/2 */

bn_mp_div_2d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */

bn_mp_div_3.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* divide by three (based on routine from MPI and the GMP manual) */

bn_mp_div_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 static int s_is_power_of_two(mp_digit b, int *p)

bn_mp_dr_is_modulus.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines if a number is a valid DR modulus */

bn_mp_dr_reduce.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* reduce "x" in place modulo "n" using the Diminished Radix algorithm.

bn_mp_dr_setup.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines the setup value */

bn_mp_exch.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* swap the elements of two integers, for cases where you can't simply swap the

bn_mp_export.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* based on gmp's mpz_export.

bn_mp_expt_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* wrapper function for mp_expt_d_ex() */

bn_mp_expt_d_ex.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* calculate c = a**b  using a square-multiply algorithm */

bn_mp_exptmod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 

bn_mp_exptmod_fast.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes Y == G**X mod P, HAC pp.616, Algorithm 14.85

bn_mp_exteuclid.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Extended euclidean algorithm of (a, b) produces

bn_mp_fread.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 #ifndef LTM_NO_FILE

bn_mp_fwrite.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 #ifndef LTM_NO_FILE

bn_mp_gcd.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Greatest Common Divisor using the binary method */

bn_mp_get_bit.c

@@ -10,8 +10,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Checks the bit at position b and returns MP_YES

bn_mp_get_double.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 double mp_get_double(const mp_int *a)

bn_mp_get_int.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* get the lower 32-bits of an mp_int */

bn_mp_get_long.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* get the lower unsigned long of an mp_int, platform dependent */

bn_mp_get_long_long.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* get the lower unsigned long long of an mp_int, platform dependent */

bn_mp_grow.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* grow as required */

bn_mp_import.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* based on gmp's mpz_import.

bn_mp_init.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* init a new mp_int */

bn_mp_init_copy.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* creates "a" then copies b into it */

bn_mp_init_multi.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 #include <stdarg.h>

bn_mp_init_set.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* initialize and set a digit */

bn_mp_init_set_int.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* initialize and set a digit */

bn_mp_init_size.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* init an mp_init for a given size */

bn_mp_invmod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* hac 14.61, pp608 */

bn_mp_invmod_slow.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* hac 14.61, pp608 */

bn_mp_is_square.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Check if remainders are possible squares - fast exclude non-squares */

bn_mp_jacobi.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes the jacobi c = (a | n) (or Legendre if n is prime)

bn_mp_karatsuba_mul.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* c = |a| * |b| using Karatsuba Multiplication using

bn_mp_karatsuba_sqr.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Karatsuba squaring, computes b = a*a using three

bn_mp_kronecker.c

@@ -10,8 +10,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /*

bn_mp_lcm.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes least common multiple as |a*b|/(a, b) */

bn_mp_lshd.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* shift left a certain amount of digits */

bn_mp_mod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */

bn_mp_mod_2d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* calc a value mod 2**b */

bn_mp_mod_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 int mp_mod_d(const mp_int *a, mp_digit b, mp_digit *c)

bn_mp_montgomery_calc_normalization.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /*

bn_mp_montgomery_reduce.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* computes xR**-1 == x (mod N) via Montgomery Reduction */

bn_mp_montgomery_setup.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* setups the montgomery reduction stuff */

bn_mp_mul.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* high level multiplication (handles sign) */

bn_mp_mul_2.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* b = a*2 */

bn_mp_mul_2d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* shift left by a certain bit count */

bn_mp_mul_d.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* multiply by a digit */

bn_mp_mulmod.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* d = a * b (mod c) */

bn_mp_n_root.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* wrapper function for mp_n_root_ex()

bn_mp_n_root_ex.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* find the n'th root of an integer

bn_mp_neg.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* b = -a */

bn_mp_or.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* OR two ints together */

bn_mp_prime_fermat.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* performs one Fermat test.

bn_mp_prime_frobenius_underwood.c

@@ -10,8 +10,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /*

bn_mp_prime_is_divisible.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines if an integers is divisible by one

bn_mp_prime_is_prime.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* portable integer log of two with small footprint */

bn_mp_prime_miller_rabin.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* Miller-Rabin test of "a" to the base of "b" as described in

bn_mp_prime_next_prime.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* finds the next prime after the number "a" using "t" trials

bn_mp_prime_rabin_miller_trials.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 

bn_mp_prime_random_ex.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* makes a truly random prime of a given size (bits),

bn_mp_prime_strong_lucas_selfridge.c

@@ -10,8 +10,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /*

bn_mp_radix_size.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* returns size of ASCII reprensentation */

bn_mp_radix_smap.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* chars used in radix conversions */

bn_mp_rand.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* First the OS-specific special cases

bn_mp_read_radix.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* read a string [ASCII] in a given radix */

bn_mp_read_signed_bin.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* read signed bin, big endian, first byte is 0==positive or 1==negative */

bn_mp_read_unsigned_bin.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* reads a unsigned char array, assumes the msb is stored first [big endian] */

bn_mp_reduce.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* reduces x mod m, assumes 0 < x < m**2, mu is

bn_mp_reduce_2k.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* reduces a modulo n where n is of the form 2**p - d */

bn_mp_reduce_2k_l.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* reduces a modulo n where n is of the form 2**p - d

bn_mp_reduce_2k_setup.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines the setup value */

bn_mp_reduce_2k_setup_l.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines the setup value */

bn_mp_reduce_is_2k.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines if mp_reduce_2k can be used */

bn_mp_reduce_is_2k_l.c

@@ -9,8 +9,7 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* determines if reduce_2k_l can be used */