dropbear: libtommath/bn_mp_unpack.c comparison

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-:b59623a64678
+:d529a52b2f7c
+#include "tommath_private.h"
+#ifdef BN_MP_UNPACK_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+/* based on gmp's mpz_import.
+* see http://gmplib.org/manual/Integer-Import-and-Export.html
+*/
+mp_err mp_unpack(mp_int *rop, size_t count, mp_order order, size_t size,
+mp_endian endian, size_t nails, const void *op)
+{
+mp_err err;
+size_t odd_nails, nail_bytes, i, j;
+unsigned char odd_nail_mask;
+mp_zero(rop);
+if (endian == MP_NATIVE_ENDIAN) {
+MP_GET_ENDIANNESS(endian);
+}
+odd_nails = (nails % 8u);
+odd_nail_mask = 0xff;
+for (i = 0; i < odd_nails; ++i) {
+odd_nail_mask ^= (unsigned char)(1u << (7u - i));
+}
+nail_bytes = nails / 8u;
+for (i = 0; i < count; ++i) {
+for (j = 0; j < (size - nail_bytes); ++j) {
+unsigned char byte = *((const unsigned char *)op +
+(((order == MP_MSB_FIRST) ? i : ((count - 1u) - i)) * size) +
+((endian == MP_BIG_ENDIAN) ? (j + nail_bytes) : (((size - 1u) - j) - nail_bytes)));
+if ((err = mp_mul_2d(rop, (j == 0u) ? (int)(8u - odd_nails) : 8, rop)) != MP_OKAY) {
+return err;
+}
+rop->dp[0] |= (j == 0u) ? (mp_digit)(byte & odd_nail_mask) : (mp_digit)byte;
+rop->used  += 1;
+}
+}
+mp_clamp(rop);
+return MP_OKAY;
+}
+#endif

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