diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c')
-rw-r--r-- | third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c new file mode 100644 index 0000000..9e904c5 --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_grow.c @@ -0,0 +1,38 @@ +#include "tommath_private.h" +#ifdef BN_MP_GROW_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ + +/* grow as required */ +mp_err mp_grow(mp_int *a, int size) +{ + int i; + mp_digit *tmp; + + /* if the alloc size is smaller alloc more ram */ + if (a->alloc < size) { + /* reallocate the array a->dp + * + * We store the return in a temporary variable + * in case the operation failed we don't want + * to overwrite the dp member of a. + */ + tmp = (mp_digit *) MP_REALLOC(a->dp, + (size_t)a->alloc * sizeof(mp_digit), + (size_t)size * sizeof(mp_digit)); + if (tmp == NULL) { + /* reallocation failed but "a" is still valid [can be freed] */ + return MP_MEM; + } + + /* reallocation succeeded so set a->dp */ + a->dp = tmp; + + /* zero excess digits */ + i = a->alloc; + a->alloc = size; + MP_ZERO_DIGITS(a->dp + i, a->alloc - i); + } + return MP_OKAY; +} +#endif |