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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
* The license is detailed in the file LICENSE.md, and applies to this file.
*
* Written by Nir Drucker and Shay Gueron
* AWS Cryptographic Algorithms Group.
* (ndrucker@amazon.com, gueron@amazon.com)
*/
#include "decode.h"
#include "utilities.h"
// Convert a sequence of uint8_t elements which fully uses all 8-bits of
// an uint8_t element to a sequence of uint8_t which uses just a single
// bit per byte (either 0 or 1).
EXTERNC void
convert_to_redundant_rep(OUT uint8_t *out,
IN const uint8_t *in,
IN const uint64_t len)
{
uint8_t tmp;
for(uint32_t i = 0; i < (len / 8); i++)
{
tmp = in[i];
for(uint8_t j = 0; j < 8; j++)
{
out[8 * i + j] |= (tmp & 0x1);
tmp >>= 1;
}
}
// Convert the reminder
tmp = in[len / 8];
for(uint32_t j = 8 * (len / 8); j < len; j++)
{
out[j] |= (tmp & 0x1);
tmp >>= 1;
}
}
EXTERNC uint64_t
count_ones(IN const uint8_t *in, IN const uint32_t len)
{
uint64_t acc = 0;
for(uint32_t i = 0; i < len; i++)
{
acc += __builtin_popcount(in[i]);
}
return acc;
}
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