mirror of
https://github.com/yuzu-emu/mbedtls
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c0dfcd4bf1
This reduces clutter, making the functions more readable. Also, it makes lcov see each line as covered. This is not cheating, as the lines that were previously seen as not covered are not supposed to be reached anyway (failing branches of the selftests). Thanks to this and previous test suite enhancements, lcov now sees chacha20.c and poly1305.c at 100% line coverage, and for chachapoly.c only two lines are not covered (error returns from lower-level module that should never happen except perhaps if an alternative implementation returns an unexpected error).
534 lines
16 KiB
C
534 lines
16 KiB
C
/**
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* \file poly1305.c
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*
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* \brief Poly1305 authentication algorithm.
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*
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* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_POLY1305_C)
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#if !defined(MBEDTLS_POLY1305_ALT)
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#include "mbedtls/poly1305.h"
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#include <string.h>
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#if defined(MBEDTLS_SELF_TEST)
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_printf printf
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#endif /* MBEDTLS_PLATFORM_C */
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#endif /* MBEDTLS_SELF_TEST */
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#define POLY1305_BLOCK_SIZE_BYTES ( 16U )
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#define BYTES_TO_U32_LE( data, offset ) \
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( (uint32_t) data[offset] \
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| (uint32_t) ( (uint32_t) data[( offset ) + 1] << 8 ) \
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| (uint32_t) ( (uint32_t) data[( offset ) + 2] << 16 ) \
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| (uint32_t) ( (uint32_t) data[( offset ) + 3] << 24 ) \
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)
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/**
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* \brief Process blocks with Poly1305.
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*
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* \param ctx The Poly1305 context.
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* \param nblocks Number of blocks to process. Note that this function
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* only processes full blocks.
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* \param input Buffer containing the input block(s).
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* \param needs_padding Set to 0 if the padding bit has already been applied
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* to the input data before calling this function.
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* Otherwise, set this parameter to 1.
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*/
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static void mbedtls_poly1305_process( mbedtls_poly1305_context *ctx,
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size_t nblocks,
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const unsigned char *input,
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uint32_t needs_padding )
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{
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uint64_t d0, d1, d2, d3;
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uint32_t acc0, acc1, acc2, acc3, acc4;
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uint32_t r0, r1, r2, r3;
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uint32_t rs1, rs2, rs3;
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size_t offset = 0U;
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size_t i;
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r0 = ctx->r[0];
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r1 = ctx->r[1];
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r2 = ctx->r[2];
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r3 = ctx->r[3];
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rs1 = r1 + ( r1 >> 2U );
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rs2 = r2 + ( r2 >> 2U );
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rs3 = r3 + ( r3 >> 2U );
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acc0 = ctx->acc[0];
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acc1 = ctx->acc[1];
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acc2 = ctx->acc[2];
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acc3 = ctx->acc[3];
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acc4 = ctx->acc[4];
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/* Process full blocks */
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for ( i = 0U; i < nblocks; i++ )
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{
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/* Compute: acc += block */
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/* Note that the input block is treated as a 128-bit little-endian integer */
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d0 = (uint64_t) acc0 + BYTES_TO_U32_LE( input, offset + 0 );
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d1 = (uint64_t) acc1 + BYTES_TO_U32_LE( input, offset + 4 ) + ( d0 >> 32U );
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d2 = (uint64_t) acc2 + BYTES_TO_U32_LE( input, offset + 8 ) + ( d1 >> 32U );
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d3 = (uint64_t) acc3 + BYTES_TO_U32_LE( input, offset + 12 ) + ( d2 >> 32U );
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acc0 = (uint32_t) d0;
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acc1 = (uint32_t) d1;
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acc2 = (uint32_t) d2;
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acc3 = (uint32_t) d3;
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acc4 += (uint32_t) ( d3 >> 32U ) + needs_padding;
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/* Compute: acc *= r */
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d0 = ( (uint64_t) acc0 * r0 ) +
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( (uint64_t) acc1 * rs3 ) +
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( (uint64_t) acc2 * rs2 ) +
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( (uint64_t) acc3 * rs1 );
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d1 = ( (uint64_t) acc0 * r1 ) +
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( (uint64_t) acc1 * r0 ) +
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( (uint64_t) acc2 * rs3 ) +
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( (uint64_t) acc3 * rs2 ) +
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( (uint64_t) acc4 * rs1 );
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d2 = ( (uint64_t) acc0 * r2 ) +
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( (uint64_t) acc1 * r1 ) +
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( (uint64_t) acc2 * r0 ) +
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( (uint64_t) acc3 * rs3 ) +
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( (uint64_t) acc4 * rs2 );
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d3 = ( (uint64_t) acc0 * r3 ) +
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( (uint64_t) acc1 * r2 ) +
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( (uint64_t) acc2 * r1 ) +
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( (uint64_t) acc3 * r0 ) +
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( (uint64_t) acc4 * rs3 );
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acc4 *= r0;
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/* Compute: acc %= (2^130 - 5) (partial remainder) */
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d1 += ( d0 >> 32 );
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d2 += ( d1 >> 32 );
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d3 += ( d2 >> 32 );
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acc0 = (uint32_t) d0;
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acc1 = (uint32_t) d1;
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acc2 = (uint32_t) d2;
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acc3 = (uint32_t) d3;
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acc4 = (uint32_t) ( d3 >> 32 ) + acc4;
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d0 = (uint64_t) acc0 + ( acc4 >> 2 ) + ( acc4 & 0xFFFFFFFCU );
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acc4 &= 3U;
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acc0 = (uint32_t) d0;
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d0 = (uint64_t) acc1 + ( d0 >> 32U );
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acc1 = (uint32_t) d0;
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d0 = (uint64_t) acc2 + ( d0 >> 32U );
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acc2 = (uint32_t) d0;
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d0 = (uint64_t) acc3 + ( d0 >> 32U );
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acc3 = (uint32_t) d0;
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d0 = (uint64_t) acc4 + ( d0 >> 32U );
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acc4 = (uint32_t) d0;
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offset += POLY1305_BLOCK_SIZE_BYTES;
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}
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ctx->acc[0] = acc0;
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ctx->acc[1] = acc1;
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ctx->acc[2] = acc2;
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ctx->acc[3] = acc3;
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ctx->acc[4] = acc4;
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}
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/**
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* \brief Compute the Poly1305 MAC
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*
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* \param ctx The Poly1305 context.
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* \param mac The buffer to where the MAC is written. Must be
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* big enough to contain the 16-byte MAC.
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*/
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static void mbedtls_poly1305_compute_mac( const mbedtls_poly1305_context *ctx,
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unsigned char mac[16] )
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{
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uint64_t d;
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uint32_t g0, g1, g2, g3, g4;
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uint32_t acc0, acc1, acc2, acc3, acc4;
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uint32_t mask;
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uint32_t mask_inv;
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acc0 = ctx->acc[0];
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acc1 = ctx->acc[1];
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acc2 = ctx->acc[2];
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acc3 = ctx->acc[3];
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acc4 = ctx->acc[4];
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/* Before adding 's' we need to ensure that the accumulator is mod 2^130 - 5.
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* We do this by calculating acc - (2^130 - 5), then checking if
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* the 131st bit is set. If it is, then reduce: acc -= (2^130 - 5)
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*/
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/* Calculate acc + -(2^130 - 5) */
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d = ( (uint64_t) acc0 + 5U );
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g0 = (uint32_t) d;
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d = ( (uint64_t) acc1 + ( d >> 32 ) );
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g1 = (uint32_t) d;
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d = ( (uint64_t) acc2 + ( d >> 32 ) );
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g2 = (uint32_t) d;
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d = ( (uint64_t) acc3 + ( d >> 32 ) );
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g3 = (uint32_t) d;
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g4 = acc4 + (uint32_t) ( d >> 32U );
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/* mask == 0xFFFFFFFF if 131st bit is set, otherwise mask == 0 */
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mask = (uint32_t) 0U - ( g4 >> 2U );
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mask_inv = ~mask;
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/* If 131st bit is set then acc=g, otherwise, acc is unmodified */
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acc0 = ( acc0 & mask_inv ) | ( g0 & mask );
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acc1 = ( acc1 & mask_inv ) | ( g1 & mask );
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acc2 = ( acc2 & mask_inv ) | ( g2 & mask );
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acc3 = ( acc3 & mask_inv ) | ( g3 & mask );
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/* Add 's' */
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d = (uint64_t) acc0 + ctx->s[0];
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acc0 = (uint32_t) d;
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d = (uint64_t) acc1 + ctx->s[1] + ( d >> 32U );
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acc1 = (uint32_t) d;
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d = (uint64_t) acc2 + ctx->s[2] + ( d >> 32U );
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acc2 = (uint32_t) d;
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acc3 += ctx->s[3] + (uint32_t) ( d >> 32U );
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/* Compute MAC (128 least significant bits of the accumulator) */
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mac[0] = (unsigned char) acc0;
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mac[1] = (unsigned char) ( acc0 >> 8 );
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mac[2] = (unsigned char) ( acc0 >> 16 );
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mac[3] = (unsigned char) ( acc0 >> 24 );
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mac[4] = (unsigned char) acc1;
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mac[5] = (unsigned char) ( acc1 >> 8 );
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mac[6] = (unsigned char) ( acc1 >> 16 );
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mac[7] = (unsigned char) ( acc1 >> 24 );
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mac[8] = (unsigned char) acc2;
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mac[9] = (unsigned char) ( acc2 >> 8 );
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mac[10] = (unsigned char) ( acc2 >> 16 );
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mac[11] = (unsigned char) ( acc2 >> 24 );
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mac[12] = (unsigned char) acc3;
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mac[13] = (unsigned char) ( acc3 >> 8 );
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mac[14] = (unsigned char) ( acc3 >> 16 );
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mac[15] = (unsigned char) ( acc3 >> 24 );
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}
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void mbedtls_poly1305_init( mbedtls_poly1305_context *ctx )
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{
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if ( ctx != NULL )
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{
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mbedtls_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
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}
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}
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void mbedtls_poly1305_free( mbedtls_poly1305_context *ctx )
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{
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if ( ctx != NULL )
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{
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mbedtls_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
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}
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}
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int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
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const unsigned char key[32] )
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{
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if ( ctx == NULL || key == NULL )
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{
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return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
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}
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/* r &= 0x0ffffffc0ffffffc0ffffffc0fffffff */
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ctx->r[0] = BYTES_TO_U32_LE( key, 0 ) & 0x0FFFFFFFU;
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ctx->r[1] = BYTES_TO_U32_LE( key, 4 ) & 0x0FFFFFFCU;
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ctx->r[2] = BYTES_TO_U32_LE( key, 8 ) & 0x0FFFFFFCU;
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ctx->r[3] = BYTES_TO_U32_LE( key, 12 ) & 0x0FFFFFFCU;
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ctx->s[0] = BYTES_TO_U32_LE( key, 16 );
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ctx->s[1] = BYTES_TO_U32_LE( key, 20 );
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ctx->s[2] = BYTES_TO_U32_LE( key, 24 );
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ctx->s[3] = BYTES_TO_U32_LE( key, 28 );
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/* Initial accumulator state */
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ctx->acc[0] = 0U;
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ctx->acc[1] = 0U;
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ctx->acc[2] = 0U;
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ctx->acc[3] = 0U;
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ctx->acc[4] = 0U;
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/* Queue initially empty */
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mbedtls_zeroize( ctx->queue, sizeof( ctx->queue ) );
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ctx->queue_len = 0U;
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return( 0 );
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}
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int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
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const unsigned char *input,
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size_t ilen )
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{
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size_t offset = 0U;
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size_t remaining = ilen;
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size_t queue_free_len;
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size_t nblocks;
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if ( ctx == NULL )
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{
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return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
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}
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else if ( ( ilen > 0U ) && ( input == NULL ) )
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{
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/* input pointer is allowed to be NULL only if ilen == 0 */
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return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
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}
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if ( ( remaining > 0U ) && ( ctx->queue_len > 0U ) )
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{
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queue_free_len = ( POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
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if ( ilen < queue_free_len )
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{
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/* Not enough data to complete the block.
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* Store this data with the other leftovers.
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*/
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memcpy( &ctx->queue[ctx->queue_len],
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input,
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ilen );
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ctx->queue_len += ilen;
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remaining = 0U;
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}
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else
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{
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/* Enough data to produce a complete block */
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memcpy( &ctx->queue[ctx->queue_len],
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input,
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queue_free_len );
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ctx->queue_len = 0U;
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mbedtls_poly1305_process( ctx,
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1U,
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ctx->queue,
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1U ); /* add padding bit */
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offset += queue_free_len;
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remaining -= queue_free_len;
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}
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}
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if ( remaining >= POLY1305_BLOCK_SIZE_BYTES )
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{
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nblocks = remaining / POLY1305_BLOCK_SIZE_BYTES;
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mbedtls_poly1305_process( ctx, nblocks, &input[offset], 1U );
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offset += nblocks * POLY1305_BLOCK_SIZE_BYTES;
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remaining %= POLY1305_BLOCK_SIZE_BYTES;
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}
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if ( remaining > 0U )
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{
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/* Store partial block */
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ctx->queue_len = remaining;
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memcpy( ctx->queue, &input[offset], remaining );
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}
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return( 0 );
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}
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int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
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unsigned char mac[16] )
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{
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if ( ( ctx == NULL ) || ( mac == NULL ) )
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{
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return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
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}
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/* Process any leftover data */
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if ( ctx->queue_len > 0U )
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{
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/* Add padding bit */
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ctx->queue[ctx->queue_len] = 1U;
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ctx->queue_len++;
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/* Pad with zeroes */
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memset( &ctx->queue[ctx->queue_len],
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0,
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POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
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mbedtls_poly1305_process( ctx,
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1U, /* Process 1 block */
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ctx->queue,
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0U ); /* Don't add padding bit (it was just added above) */
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}
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mbedtls_poly1305_compute_mac( ctx, mac );
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return( 0 );
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}
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int mbedtls_poly1305_mac( const unsigned char key[32],
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const unsigned char *input,
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size_t ilen,
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unsigned char mac[16] )
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{
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mbedtls_poly1305_context ctx;
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int result;
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mbedtls_poly1305_init( &ctx );
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result = mbedtls_poly1305_starts( &ctx, key );
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if ( result != 0 )
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goto cleanup;
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result = mbedtls_poly1305_update( &ctx, input, ilen );
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if ( result != 0 )
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goto cleanup;
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result = mbedtls_poly1305_finish( &ctx, mac );
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cleanup:
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mbedtls_poly1305_free( &ctx );
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return( result );
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}
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#endif /* MBEDTLS_POLY1305_ALT */
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#if defined(MBEDTLS_SELF_TEST)
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static const unsigned char test_keys[2][32] =
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{
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{
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0x85, 0xd6, 0xbe, 0x78, 0x57, 0x55, 0x6d, 0x33,
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0x7f, 0x44, 0x52, 0xfe, 0x42, 0xd5, 0x06, 0xa8,
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0x01, 0x03, 0x80, 0x8a, 0xfb, 0x0d, 0xb2, 0xfd,
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0x4a, 0xbf, 0xf6, 0xaf, 0x41, 0x49, 0xf5, 0x1b
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},
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{
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0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a,
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0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
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0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09,
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0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0
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}
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};
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static const unsigned char test_data[2][127] =
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{
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{
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0x43, 0x72, 0x79, 0x70, 0x74, 0x6f, 0x67, 0x72,
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0x61, 0x70, 0x68, 0x69, 0x63, 0x20, 0x46, 0x6f,
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0x72, 0x75, 0x6d, 0x20, 0x52, 0x65, 0x73, 0x65,
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0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6f,
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0x75, 0x70
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},
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{
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0x27, 0x54, 0x77, 0x61, 0x73, 0x20, 0x62, 0x72,
|
|
0x69, 0x6c, 0x6c, 0x69, 0x67, 0x2c, 0x20, 0x61,
|
|
0x6e, 0x64, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
|
|
0x6c, 0x69, 0x74, 0x68, 0x79, 0x20, 0x74, 0x6f,
|
|
0x76, 0x65, 0x73, 0x0a, 0x44, 0x69, 0x64, 0x20,
|
|
0x67, 0x79, 0x72, 0x65, 0x20, 0x61, 0x6e, 0x64,
|
|
0x20, 0x67, 0x69, 0x6d, 0x62, 0x6c, 0x65, 0x20,
|
|
0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x77,
|
|
0x61, 0x62, 0x65, 0x3a, 0x0a, 0x41, 0x6c, 0x6c,
|
|
0x20, 0x6d, 0x69, 0x6d, 0x73, 0x79, 0x20, 0x77,
|
|
0x65, 0x72, 0x65, 0x20, 0x74, 0x68, 0x65, 0x20,
|
|
0x62, 0x6f, 0x72, 0x6f, 0x67, 0x6f, 0x76, 0x65,
|
|
0x73, 0x2c, 0x0a, 0x41, 0x6e, 0x64, 0x20, 0x74,
|
|
0x68, 0x65, 0x20, 0x6d, 0x6f, 0x6d, 0x65, 0x20,
|
|
0x72, 0x61, 0x74, 0x68, 0x73, 0x20, 0x6f, 0x75,
|
|
0x74, 0x67, 0x72, 0x61, 0x62, 0x65, 0x2e
|
|
}
|
|
};
|
|
|
|
static const size_t test_data_len[2] =
|
|
{
|
|
34U,
|
|
127U
|
|
};
|
|
|
|
static const unsigned char test_mac[2][16] =
|
|
{
|
|
{
|
|
0xa8, 0x06, 0x1d, 0xc1, 0x30, 0x51, 0x36, 0xc6,
|
|
0xc2, 0x2b, 0x8b, 0xaf, 0x0c, 0x01, 0x27, 0xa9
|
|
},
|
|
{
|
|
0x45, 0x41, 0x66, 0x9a, 0x7e, 0xaa, 0xee, 0x61,
|
|
0xe7, 0x08, 0xdc, 0x7c, 0xbc, 0xc5, 0xeb, 0x62
|
|
}
|
|
};
|
|
|
|
#define ASSERT( cond, args ) \
|
|
do \
|
|
{ \
|
|
if( ! ( cond ) ) \
|
|
{ \
|
|
if( verbose != 0 ) \
|
|
mbedtls_printf args; \
|
|
\
|
|
return( -1 ); \
|
|
} \
|
|
} \
|
|
while( 0 )
|
|
|
|
int mbedtls_poly1305_self_test( int verbose )
|
|
{
|
|
unsigned char mac[16];
|
|
unsigned i;
|
|
int result;
|
|
|
|
for( i = 0U; i < 2U; i++ )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( " Poly1305 test %u ", i );
|
|
|
|
result = mbedtls_poly1305_mac( test_keys[i],
|
|
test_data[i],
|
|
test_data_len[i],
|
|
mac );
|
|
ASSERT( 0 == result, ( "error code: %i\n", result ) );
|
|
|
|
ASSERT( 0 == memcmp( mac, test_mac[i], 16U ), ( "failed (mac)\n" ) );
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "passed\n" );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "\n" );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#endif /* MBEDTLS_POLY1305_C */
|