diff options
Diffstat (limited to 'lib/mpi/mpicoder.c')
| -rw-r--r-- | lib/mpi/mpicoder.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c index 5a0f75a3bf01..659d787fb2fd 100644 --- a/lib/mpi/mpicoder.c +++ b/lib/mpi/mpicoder.c @@ -137,11 +137,12 @@ static int count_lzeros(MPI a) * the data to-be-written on -EOVERFLOW in case buf_len was too * small. * @sign: if not NULL, it will be set to the sign of a. + * @skip_lzeros:Skip the leading zeros of the MPI before writing to buffer. * * Return: 0 on success or error code in case of error */ int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes, - int *sign) + int *sign, bool skip_lzeros) { uint8_t *p; #if BYTES_PER_MPI_LIMB == 4 @@ -152,7 +153,7 @@ int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes, #error please implement for this limb size. #endif unsigned int n = mpi_get_size(a); - int i, lzeros; + int i, lzeros = 0; if (!buf || !nbytes) return -EINVAL; @@ -160,7 +161,8 @@ int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes, if (sign) *sign = a->sign; - lzeros = count_lzeros(a); + if (skip_lzeros) + lzeros = count_lzeros(a); if (buf_len < n - lzeros) { *nbytes = n - lzeros; @@ -219,7 +221,7 @@ void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign) if (!buf) return NULL; - ret = mpi_read_buffer(a, buf, n, nbytes, sign); + ret = mpi_read_buffer(a, buf, n, nbytes, sign, true); if (ret) { kfree(buf); |