Revert "remove headers too"

This reverts commit 2b6a81d.

Author: minad

bn_error.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_ERROR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 static const struct {
    int code;
    const char *msg;

bn_fast_mp_invmod.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_FAST_MP_INVMOD_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* computes the modular inverse via binary extended euclidean algorithm,
  * that is c = 1/a mod b
  *

bn_fast_mp_montgomery_reduce.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_FAST_MP_MONTGOMERY_REDUCE_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* computes xR**-1 == x (mod N) via Montgomery Reduction
  *
  * This is an optimized implementation of montgomery_reduce

bn_fast_s_mp_mul_digs.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_FAST_S_MP_MUL_DIGS_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* Fast (comba) multiplier
  *
  * This is the fast column-array [comba] multiplier.  It is

bn_fast_s_mp_mul_high_digs.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* this is a modified version of fast_s_mul_digs that only produces
  * output digits *above* digs.  See the comments for fast_s_mul_digs
  * to see how it works.

bn_fast_s_mp_sqr.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_FAST_S_MP_SQR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* the jist of squaring...
  * you do like mult except the offset of the tmpx [one that
  * starts closer to zero] can't equal the offset of tmpy.

bn_mp_2expt.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_2EXPT_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* computes a = 2**b
  *
  * Simple algorithm which zeroes the int, grows it then just sets one bit

bn_mp_abs.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_ABS_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* b = |a|
  *
  * Simple function copies the input and fixes the sign to positive

bn_mp_add.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_ADD_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* high level addition (handles signs) */
 int mp_add(const mp_int *a, const mp_int *b, mp_int *c)
 {

bn_mp_add_d.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_ADD_D_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* single digit addition */
 int mp_add_d(const mp_int *a, mp_digit b, mp_int *c)
 {

bn_mp_addmod.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_ADDMOD_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* d = a + b (mod c) */
 int mp_addmod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
 {

bn_mp_and.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_AND_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* AND two ints together */
 int mp_and(const mp_int *a, const mp_int *b, mp_int *c)
 {

bn_mp_clamp.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CLAMP_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* trim unused digits
  *
  * This is used to ensure that leading zero digits are

bn_mp_clear.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CLEAR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* clear one (frees)  */
 void mp_clear(mp_int *a)
 {

bn_mp_clear_multi.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CLEAR_MULTI_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 #include <stdarg.h>
 
 void mp_clear_multi(mp_int *mp, ...)

bn_mp_cmp.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CMP_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* compare two ints (signed)*/
 int mp_cmp(const mp_int *a, const mp_int *b)
 {

bn_mp_cmp_d.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CMP_D_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* compare a digit */
 int mp_cmp_d(const mp_int *a, mp_digit b)
 {

bn_mp_cmp_mag.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CMP_MAG_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* compare maginitude of two ints (unsigned) */
 int mp_cmp_mag(const mp_int *a, const mp_int *b)
 {

bn_mp_cnt_lsb.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_CNT_LSB_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 static const int lnz[16] = {
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
 };

bn_mp_complement.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_COMPLEMENT_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* b = ~a */
 int mp_complement(const mp_int *a, mp_int *b)
 {

bn_mp_copy.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_COPY_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* copy, b = a */
 int mp_copy(const mp_int *a, mp_int *b)
 {

bn_mp_count_bits.c

@@ -1,5 +1,17 @@
 #include "tommath_private.h"
 #ifdef BN_MP_COUNT_BITS_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
 /* returns the number of bits in an int */
 int mp_count_bits(const mp_int *a)
 {