| #include <tommath.h> |
| #ifdef BN_MP_READ_UNSIGNED_BIN_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. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| * |
| * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org |
| */ |
| |
| /* reads a unsigned char array, assumes the msb is stored first [big endian] */ |
| int |
| mp_read_unsigned_bin (mp_int * a, unsigned char *b, int c) |
| { |
| int res; |
| |
| /* make sure there are at least two digits */ |
| if (a->alloc < 2) { |
| if ((res = mp_grow(a, 2)) != MP_OKAY) { |
| return res; |
| } |
| } |
| |
| /* zero the int */ |
| mp_zero (a); |
| |
| /* read the bytes in */ |
| while (c-- > 0) { |
| if ((res = mp_mul_2d (a, 8, a)) != MP_OKAY) { |
| return res; |
| } |
| |
| #ifndef MP_8BIT |
| a->dp[0] |= *b++; |
| a->used += 1; |
| #else |
| a->dp[0] = (*b & MP_MASK); |
| a->dp[1] |= ((*b++ >> 7U) & 1); |
| a->used += 2; |
| #endif |
| } |
| mp_clamp (a); |
| return MP_OKAY; |
| } |
| #endif |