[398] | 1 | /**
|
---|
| 2 | * \file poly1305.c
|
---|
| 3 | *
|
---|
| 4 | * \brief Poly1305 authentication algorithm.
|
---|
| 5 | *
|
---|
| 6 | * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
|
---|
| 7 | * SPDX-License-Identifier: Apache-2.0
|
---|
| 8 | *
|
---|
| 9 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
|
---|
| 10 | * not use this file except in compliance with the License.
|
---|
| 11 | * You may obtain a copy of the License at
|
---|
| 12 | *
|
---|
| 13 | * http://www.apache.org/licenses/LICENSE-2.0
|
---|
| 14 | *
|
---|
| 15 | * Unless required by applicable law or agreed to in writing, software
|
---|
| 16 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
---|
| 17 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
---|
| 18 | * See the License for the specific language governing permissions and
|
---|
| 19 | * limitations under the License.
|
---|
| 20 | *
|
---|
| 21 | * This file is part of mbed TLS (https://tls.mbed.org)
|
---|
| 22 | */
|
---|
| 23 | #if !defined(MBEDTLS_CONFIG_FILE)
|
---|
| 24 | #include "mbedtls/config.h"
|
---|
| 25 | #else
|
---|
| 26 | #include MBEDTLS_CONFIG_FILE
|
---|
| 27 | #endif
|
---|
| 28 |
|
---|
| 29 | #if defined(MBEDTLS_POLY1305_C)
|
---|
| 30 |
|
---|
| 31 | #include "mbedtls/poly1305.h"
|
---|
| 32 | #include "mbedtls/platform_util.h"
|
---|
| 33 |
|
---|
| 34 | #include <string.h>
|
---|
| 35 |
|
---|
| 36 | #if defined(MBEDTLS_SELF_TEST)
|
---|
| 37 | #if defined(MBEDTLS_PLATFORM_C)
|
---|
| 38 | #include "mbedtls/platform.h"
|
---|
| 39 | #else
|
---|
| 40 | #include <stdio.h>
|
---|
| 41 | #define mbedtls_printf printf
|
---|
| 42 | #endif /* MBEDTLS_PLATFORM_C */
|
---|
| 43 | #endif /* MBEDTLS_SELF_TEST */
|
---|
| 44 |
|
---|
| 45 | #if !defined(MBEDTLS_POLY1305_ALT)
|
---|
| 46 |
|
---|
| 47 | #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
|
---|
| 48 | !defined(inline) && !defined(__cplusplus)
|
---|
| 49 | #define inline __inline
|
---|
| 50 | #endif
|
---|
| 51 |
|
---|
| 52 | /* Parameter validation macros */
|
---|
| 53 | #define POLY1305_VALIDATE_RET( cond ) \
|
---|
| 54 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA )
|
---|
| 55 | #define POLY1305_VALIDATE( cond ) \
|
---|
| 56 | MBEDTLS_INTERNAL_VALIDATE( cond )
|
---|
| 57 |
|
---|
| 58 | #define POLY1305_BLOCK_SIZE_BYTES ( 16U )
|
---|
| 59 |
|
---|
| 60 | #define BYTES_TO_U32_LE( data, offset ) \
|
---|
| 61 | ( (uint32_t) data[offset] \
|
---|
| 62 | | (uint32_t) ( (uint32_t) data[( offset ) + 1] << 8 ) \
|
---|
| 63 | | (uint32_t) ( (uint32_t) data[( offset ) + 2] << 16 ) \
|
---|
| 64 | | (uint32_t) ( (uint32_t) data[( offset ) + 3] << 24 ) \
|
---|
| 65 | )
|
---|
| 66 |
|
---|
| 67 | /*
|
---|
| 68 | * Our implementation is tuned for 32-bit platforms with a 64-bit multiplier.
|
---|
| 69 | * However we provided an alternative for platforms without such a multiplier.
|
---|
| 70 | */
|
---|
| 71 | #if defined(MBEDTLS_NO_64BIT_MULTIPLICATION)
|
---|
| 72 | static uint64_t mul64( uint32_t a, uint32_t b )
|
---|
| 73 | {
|
---|
| 74 | /* a = al + 2**16 ah, b = bl + 2**16 bh */
|
---|
| 75 | const uint16_t al = (uint16_t) a;
|
---|
| 76 | const uint16_t bl = (uint16_t) b;
|
---|
| 77 | const uint16_t ah = a >> 16;
|
---|
| 78 | const uint16_t bh = b >> 16;
|
---|
| 79 |
|
---|
| 80 | /* ab = al*bl + 2**16 (ah*bl + bl*bh) + 2**32 ah*bh */
|
---|
| 81 | const uint32_t lo = (uint32_t) al * bl;
|
---|
| 82 | const uint64_t me = (uint64_t)( (uint32_t) ah * bl ) + (uint32_t) al * bh;
|
---|
| 83 | const uint32_t hi = (uint32_t) ah * bh;
|
---|
| 84 |
|
---|
| 85 | return( lo + ( me << 16 ) + ( (uint64_t) hi << 32 ) );
|
---|
| 86 | }
|
---|
| 87 | #else
|
---|
| 88 | static inline uint64_t mul64( uint32_t a, uint32_t b )
|
---|
| 89 | {
|
---|
| 90 | return( (uint64_t) a * b );
|
---|
| 91 | }
|
---|
| 92 | #endif
|
---|
| 93 |
|
---|
| 94 |
|
---|
| 95 | /**
|
---|
| 96 | * \brief Process blocks with Poly1305.
|
---|
| 97 | *
|
---|
| 98 | * \param ctx The Poly1305 context.
|
---|
| 99 | * \param nblocks Number of blocks to process. Note that this
|
---|
| 100 | * function only processes full blocks.
|
---|
| 101 | * \param input Buffer containing the input block(s).
|
---|
| 102 | * \param needs_padding Set to 0 if the padding bit has already been
|
---|
| 103 | * applied to the input data before calling this
|
---|
| 104 | * function. Otherwise, set this parameter to 1.
|
---|
| 105 | */
|
---|
| 106 | static void poly1305_process( mbedtls_poly1305_context *ctx,
|
---|
| 107 | size_t nblocks,
|
---|
| 108 | const unsigned char *input,
|
---|
| 109 | uint32_t needs_padding )
|
---|
| 110 | {
|
---|
| 111 | uint64_t d0, d1, d2, d3;
|
---|
| 112 | uint32_t acc0, acc1, acc2, acc3, acc4;
|
---|
| 113 | uint32_t r0, r1, r2, r3;
|
---|
| 114 | uint32_t rs1, rs2, rs3;
|
---|
| 115 | size_t offset = 0U;
|
---|
| 116 | size_t i;
|
---|
| 117 |
|
---|
| 118 | r0 = ctx->r[0];
|
---|
| 119 | r1 = ctx->r[1];
|
---|
| 120 | r2 = ctx->r[2];
|
---|
| 121 | r3 = ctx->r[3];
|
---|
| 122 |
|
---|
| 123 | rs1 = r1 + ( r1 >> 2U );
|
---|
| 124 | rs2 = r2 + ( r2 >> 2U );
|
---|
| 125 | rs3 = r3 + ( r3 >> 2U );
|
---|
| 126 |
|
---|
| 127 | acc0 = ctx->acc[0];
|
---|
| 128 | acc1 = ctx->acc[1];
|
---|
| 129 | acc2 = ctx->acc[2];
|
---|
| 130 | acc3 = ctx->acc[3];
|
---|
| 131 | acc4 = ctx->acc[4];
|
---|
| 132 |
|
---|
| 133 | /* Process full blocks */
|
---|
| 134 | for( i = 0U; i < nblocks; i++ )
|
---|
| 135 | {
|
---|
| 136 | /* The input block is treated as a 128-bit little-endian integer */
|
---|
| 137 | d0 = BYTES_TO_U32_LE( input, offset + 0 );
|
---|
| 138 | d1 = BYTES_TO_U32_LE( input, offset + 4 );
|
---|
| 139 | d2 = BYTES_TO_U32_LE( input, offset + 8 );
|
---|
| 140 | d3 = BYTES_TO_U32_LE( input, offset + 12 );
|
---|
| 141 |
|
---|
| 142 | /* Compute: acc += (padded) block as a 130-bit integer */
|
---|
| 143 | d0 += (uint64_t) acc0;
|
---|
| 144 | d1 += (uint64_t) acc1 + ( d0 >> 32U );
|
---|
| 145 | d2 += (uint64_t) acc2 + ( d1 >> 32U );
|
---|
| 146 | d3 += (uint64_t) acc3 + ( d2 >> 32U );
|
---|
| 147 | acc0 = (uint32_t) d0;
|
---|
| 148 | acc1 = (uint32_t) d1;
|
---|
| 149 | acc2 = (uint32_t) d2;
|
---|
| 150 | acc3 = (uint32_t) d3;
|
---|
| 151 | acc4 += (uint32_t) ( d3 >> 32U ) + needs_padding;
|
---|
| 152 |
|
---|
| 153 | /* Compute: acc *= r */
|
---|
| 154 | d0 = mul64( acc0, r0 ) +
|
---|
| 155 | mul64( acc1, rs3 ) +
|
---|
| 156 | mul64( acc2, rs2 ) +
|
---|
| 157 | mul64( acc3, rs1 );
|
---|
| 158 | d1 = mul64( acc0, r1 ) +
|
---|
| 159 | mul64( acc1, r0 ) +
|
---|
| 160 | mul64( acc2, rs3 ) +
|
---|
| 161 | mul64( acc3, rs2 ) +
|
---|
| 162 | mul64( acc4, rs1 );
|
---|
| 163 | d2 = mul64( acc0, r2 ) +
|
---|
| 164 | mul64( acc1, r1 ) +
|
---|
| 165 | mul64( acc2, r0 ) +
|
---|
| 166 | mul64( acc3, rs3 ) +
|
---|
| 167 | mul64( acc4, rs2 );
|
---|
| 168 | d3 = mul64( acc0, r3 ) +
|
---|
| 169 | mul64( acc1, r2 ) +
|
---|
| 170 | mul64( acc2, r1 ) +
|
---|
| 171 | mul64( acc3, r0 ) +
|
---|
| 172 | mul64( acc4, rs3 );
|
---|
| 173 | acc4 *= r0;
|
---|
| 174 |
|
---|
| 175 | /* Compute: acc %= (2^130 - 5) (partial remainder) */
|
---|
| 176 | d1 += ( d0 >> 32 );
|
---|
| 177 | d2 += ( d1 >> 32 );
|
---|
| 178 | d3 += ( d2 >> 32 );
|
---|
| 179 | acc0 = (uint32_t) d0;
|
---|
| 180 | acc1 = (uint32_t) d1;
|
---|
| 181 | acc2 = (uint32_t) d2;
|
---|
| 182 | acc3 = (uint32_t) d3;
|
---|
| 183 | acc4 = (uint32_t) ( d3 >> 32 ) + acc4;
|
---|
| 184 |
|
---|
| 185 | d0 = (uint64_t) acc0 + ( acc4 >> 2 ) + ( acc4 & 0xFFFFFFFCU );
|
---|
| 186 | acc4 &= 3U;
|
---|
| 187 | acc0 = (uint32_t) d0;
|
---|
| 188 | d0 = (uint64_t) acc1 + ( d0 >> 32U );
|
---|
| 189 | acc1 = (uint32_t) d0;
|
---|
| 190 | d0 = (uint64_t) acc2 + ( d0 >> 32U );
|
---|
| 191 | acc2 = (uint32_t) d0;
|
---|
| 192 | d0 = (uint64_t) acc3 + ( d0 >> 32U );
|
---|
| 193 | acc3 = (uint32_t) d0;
|
---|
| 194 | d0 = (uint64_t) acc4 + ( d0 >> 32U );
|
---|
| 195 | acc4 = (uint32_t) d0;
|
---|
| 196 |
|
---|
| 197 | offset += POLY1305_BLOCK_SIZE_BYTES;
|
---|
| 198 | }
|
---|
| 199 |
|
---|
| 200 | ctx->acc[0] = acc0;
|
---|
| 201 | ctx->acc[1] = acc1;
|
---|
| 202 | ctx->acc[2] = acc2;
|
---|
| 203 | ctx->acc[3] = acc3;
|
---|
| 204 | ctx->acc[4] = acc4;
|
---|
| 205 | }
|
---|
| 206 |
|
---|
| 207 | /**
|
---|
| 208 | * \brief Compute the Poly1305 MAC
|
---|
| 209 | *
|
---|
| 210 | * \param ctx The Poly1305 context.
|
---|
| 211 | * \param mac The buffer to where the MAC is written. Must be
|
---|
| 212 | * big enough to contain the 16-byte MAC.
|
---|
| 213 | */
|
---|
| 214 | static void poly1305_compute_mac( const mbedtls_poly1305_context *ctx,
|
---|
| 215 | unsigned char mac[16] )
|
---|
| 216 | {
|
---|
| 217 | uint64_t d;
|
---|
| 218 | uint32_t g0, g1, g2, g3, g4;
|
---|
| 219 | uint32_t acc0, acc1, acc2, acc3, acc4;
|
---|
| 220 | uint32_t mask;
|
---|
| 221 | uint32_t mask_inv;
|
---|
| 222 |
|
---|
| 223 | acc0 = ctx->acc[0];
|
---|
| 224 | acc1 = ctx->acc[1];
|
---|
| 225 | acc2 = ctx->acc[2];
|
---|
| 226 | acc3 = ctx->acc[3];
|
---|
| 227 | acc4 = ctx->acc[4];
|
---|
| 228 |
|
---|
| 229 | /* Before adding 's' we ensure that the accumulator is mod 2^130 - 5.
|
---|
| 230 | * We do this by calculating acc - (2^130 - 5), then checking if
|
---|
| 231 | * the 131st bit is set. If it is, then reduce: acc -= (2^130 - 5)
|
---|
| 232 | */
|
---|
| 233 |
|
---|
| 234 | /* Calculate acc + -(2^130 - 5) */
|
---|
| 235 | d = ( (uint64_t) acc0 + 5U );
|
---|
| 236 | g0 = (uint32_t) d;
|
---|
| 237 | d = ( (uint64_t) acc1 + ( d >> 32 ) );
|
---|
| 238 | g1 = (uint32_t) d;
|
---|
| 239 | d = ( (uint64_t) acc2 + ( d >> 32 ) );
|
---|
| 240 | g2 = (uint32_t) d;
|
---|
| 241 | d = ( (uint64_t) acc3 + ( d >> 32 ) );
|
---|
| 242 | g3 = (uint32_t) d;
|
---|
| 243 | g4 = acc4 + (uint32_t) ( d >> 32U );
|
---|
| 244 |
|
---|
| 245 | /* mask == 0xFFFFFFFF if 131st bit is set, otherwise mask == 0 */
|
---|
| 246 | mask = (uint32_t) 0U - ( g4 >> 2U );
|
---|
| 247 | mask_inv = ~mask;
|
---|
| 248 |
|
---|
| 249 | /* If 131st bit is set then acc=g, otherwise, acc is unmodified */
|
---|
| 250 | acc0 = ( acc0 & mask_inv ) | ( g0 & mask );
|
---|
| 251 | acc1 = ( acc1 & mask_inv ) | ( g1 & mask );
|
---|
| 252 | acc2 = ( acc2 & mask_inv ) | ( g2 & mask );
|
---|
| 253 | acc3 = ( acc3 & mask_inv ) | ( g3 & mask );
|
---|
| 254 |
|
---|
| 255 | /* Add 's' */
|
---|
| 256 | d = (uint64_t) acc0 + ctx->s[0];
|
---|
| 257 | acc0 = (uint32_t) d;
|
---|
| 258 | d = (uint64_t) acc1 + ctx->s[1] + ( d >> 32U );
|
---|
| 259 | acc1 = (uint32_t) d;
|
---|
| 260 | d = (uint64_t) acc2 + ctx->s[2] + ( d >> 32U );
|
---|
| 261 | acc2 = (uint32_t) d;
|
---|
| 262 | acc3 += ctx->s[3] + (uint32_t) ( d >> 32U );
|
---|
| 263 |
|
---|
| 264 | /* Compute MAC (128 least significant bits of the accumulator) */
|
---|
| 265 | mac[ 0] = (unsigned char)( acc0 );
|
---|
| 266 | mac[ 1] = (unsigned char)( acc0 >> 8 );
|
---|
| 267 | mac[ 2] = (unsigned char)( acc0 >> 16 );
|
---|
| 268 | mac[ 3] = (unsigned char)( acc0 >> 24 );
|
---|
| 269 | mac[ 4] = (unsigned char)( acc1 );
|
---|
| 270 | mac[ 5] = (unsigned char)( acc1 >> 8 );
|
---|
| 271 | mac[ 6] = (unsigned char)( acc1 >> 16 );
|
---|
| 272 | mac[ 7] = (unsigned char)( acc1 >> 24 );
|
---|
| 273 | mac[ 8] = (unsigned char)( acc2 );
|
---|
| 274 | mac[ 9] = (unsigned char)( acc2 >> 8 );
|
---|
| 275 | mac[10] = (unsigned char)( acc2 >> 16 );
|
---|
| 276 | mac[11] = (unsigned char)( acc2 >> 24 );
|
---|
| 277 | mac[12] = (unsigned char)( acc3 );
|
---|
| 278 | mac[13] = (unsigned char)( acc3 >> 8 );
|
---|
| 279 | mac[14] = (unsigned char)( acc3 >> 16 );
|
---|
| 280 | mac[15] = (unsigned char)( acc3 >> 24 );
|
---|
| 281 | }
|
---|
| 282 |
|
---|
| 283 | void mbedtls_poly1305_init( mbedtls_poly1305_context *ctx )
|
---|
| 284 | {
|
---|
| 285 | POLY1305_VALIDATE( ctx != NULL );
|
---|
| 286 |
|
---|
| 287 | mbedtls_platform_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
|
---|
| 288 | }
|
---|
| 289 |
|
---|
| 290 | void mbedtls_poly1305_free( mbedtls_poly1305_context *ctx )
|
---|
| 291 | {
|
---|
| 292 | if( ctx == NULL )
|
---|
| 293 | return;
|
---|
| 294 |
|
---|
| 295 | mbedtls_platform_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
|
---|
| 296 | }
|
---|
| 297 |
|
---|
| 298 | int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
|
---|
| 299 | const unsigned char key[32] )
|
---|
| 300 | {
|
---|
| 301 | POLY1305_VALIDATE_RET( ctx != NULL );
|
---|
| 302 | POLY1305_VALIDATE_RET( key != NULL );
|
---|
| 303 |
|
---|
| 304 | /* r &= 0x0ffffffc0ffffffc0ffffffc0fffffff */
|
---|
| 305 | ctx->r[0] = BYTES_TO_U32_LE( key, 0 ) & 0x0FFFFFFFU;
|
---|
| 306 | ctx->r[1] = BYTES_TO_U32_LE( key, 4 ) & 0x0FFFFFFCU;
|
---|
| 307 | ctx->r[2] = BYTES_TO_U32_LE( key, 8 ) & 0x0FFFFFFCU;
|
---|
| 308 | ctx->r[3] = BYTES_TO_U32_LE( key, 12 ) & 0x0FFFFFFCU;
|
---|
| 309 |
|
---|
| 310 | ctx->s[0] = BYTES_TO_U32_LE( key, 16 );
|
---|
| 311 | ctx->s[1] = BYTES_TO_U32_LE( key, 20 );
|
---|
| 312 | ctx->s[2] = BYTES_TO_U32_LE( key, 24 );
|
---|
| 313 | ctx->s[3] = BYTES_TO_U32_LE( key, 28 );
|
---|
| 314 |
|
---|
| 315 | /* Initial accumulator state */
|
---|
| 316 | ctx->acc[0] = 0U;
|
---|
| 317 | ctx->acc[1] = 0U;
|
---|
| 318 | ctx->acc[2] = 0U;
|
---|
| 319 | ctx->acc[3] = 0U;
|
---|
| 320 | ctx->acc[4] = 0U;
|
---|
| 321 |
|
---|
| 322 | /* Queue initially empty */
|
---|
| 323 | mbedtls_platform_zeroize( ctx->queue, sizeof( ctx->queue ) );
|
---|
| 324 | ctx->queue_len = 0U;
|
---|
| 325 |
|
---|
| 326 | return( 0 );
|
---|
| 327 | }
|
---|
| 328 |
|
---|
| 329 | int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
|
---|
| 330 | const unsigned char *input,
|
---|
| 331 | size_t ilen )
|
---|
| 332 | {
|
---|
| 333 | size_t offset = 0U;
|
---|
| 334 | size_t remaining = ilen;
|
---|
| 335 | size_t queue_free_len;
|
---|
| 336 | size_t nblocks;
|
---|
| 337 | POLY1305_VALIDATE_RET( ctx != NULL );
|
---|
| 338 | POLY1305_VALIDATE_RET( ilen == 0 || input != NULL );
|
---|
| 339 |
|
---|
| 340 | if( ( remaining > 0U ) && ( ctx->queue_len > 0U ) )
|
---|
| 341 | {
|
---|
| 342 | queue_free_len = ( POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
|
---|
| 343 |
|
---|
| 344 | if( ilen < queue_free_len )
|
---|
| 345 | {
|
---|
| 346 | /* Not enough data to complete the block.
|
---|
| 347 | * Store this data with the other leftovers.
|
---|
| 348 | */
|
---|
| 349 | memcpy( &ctx->queue[ctx->queue_len],
|
---|
| 350 | input,
|
---|
| 351 | ilen );
|
---|
| 352 |
|
---|
| 353 | ctx->queue_len += ilen;
|
---|
| 354 |
|
---|
| 355 | remaining = 0U;
|
---|
| 356 | }
|
---|
| 357 | else
|
---|
| 358 | {
|
---|
| 359 | /* Enough data to produce a complete block */
|
---|
| 360 | memcpy( &ctx->queue[ctx->queue_len],
|
---|
| 361 | input,
|
---|
| 362 | queue_free_len );
|
---|
| 363 |
|
---|
| 364 | ctx->queue_len = 0U;
|
---|
| 365 |
|
---|
| 366 | poly1305_process( ctx, 1U, ctx->queue, 1U ); /* add padding bit */
|
---|
| 367 |
|
---|
| 368 | offset += queue_free_len;
|
---|
| 369 | remaining -= queue_free_len;
|
---|
| 370 | }
|
---|
| 371 | }
|
---|
| 372 |
|
---|
| 373 | if( remaining >= POLY1305_BLOCK_SIZE_BYTES )
|
---|
| 374 | {
|
---|
| 375 | nblocks = remaining / POLY1305_BLOCK_SIZE_BYTES;
|
---|
| 376 |
|
---|
| 377 | poly1305_process( ctx, nblocks, &input[offset], 1U );
|
---|
| 378 |
|
---|
| 379 | offset += nblocks * POLY1305_BLOCK_SIZE_BYTES;
|
---|
| 380 | remaining %= POLY1305_BLOCK_SIZE_BYTES;
|
---|
| 381 | }
|
---|
| 382 |
|
---|
| 383 | if( remaining > 0U )
|
---|
| 384 | {
|
---|
| 385 | /* Store partial block */
|
---|
| 386 | ctx->queue_len = remaining;
|
---|
| 387 | memcpy( ctx->queue, &input[offset], remaining );
|
---|
| 388 | }
|
---|
| 389 |
|
---|
| 390 | return( 0 );
|
---|
| 391 | }
|
---|
| 392 |
|
---|
| 393 | int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
|
---|
| 394 | unsigned char mac[16] )
|
---|
| 395 | {
|
---|
| 396 | POLY1305_VALIDATE_RET( ctx != NULL );
|
---|
| 397 | POLY1305_VALIDATE_RET( mac != NULL );
|
---|
| 398 |
|
---|
| 399 | /* Process any leftover data */
|
---|
| 400 | if( ctx->queue_len > 0U )
|
---|
| 401 | {
|
---|
| 402 | /* Add padding bit */
|
---|
| 403 | ctx->queue[ctx->queue_len] = 1U;
|
---|
| 404 | ctx->queue_len++;
|
---|
| 405 |
|
---|
| 406 | /* Pad with zeroes */
|
---|
| 407 | memset( &ctx->queue[ctx->queue_len],
|
---|
| 408 | 0,
|
---|
| 409 | POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
|
---|
| 410 |
|
---|
| 411 | poly1305_process( ctx, 1U, /* Process 1 block */
|
---|
| 412 | ctx->queue, 0U ); /* Already padded above */
|
---|
| 413 | }
|
---|
| 414 |
|
---|
| 415 | poly1305_compute_mac( ctx, mac );
|
---|
| 416 |
|
---|
| 417 | return( 0 );
|
---|
| 418 | }
|
---|
| 419 |
|
---|
| 420 | int mbedtls_poly1305_mac( const unsigned char key[32],
|
---|
| 421 | const unsigned char *input,
|
---|
| 422 | size_t ilen,
|
---|
| 423 | unsigned char mac[16] )
|
---|
| 424 | {
|
---|
| 425 | mbedtls_poly1305_context ctx;
|
---|
| 426 | int ret;
|
---|
| 427 | POLY1305_VALIDATE_RET( key != NULL );
|
---|
| 428 | POLY1305_VALIDATE_RET( mac != NULL );
|
---|
| 429 | POLY1305_VALIDATE_RET( ilen == 0 || input != NULL );
|
---|
| 430 |
|
---|
| 431 | mbedtls_poly1305_init( &ctx );
|
---|
| 432 |
|
---|
| 433 | ret = mbedtls_poly1305_starts( &ctx, key );
|
---|
| 434 | if( ret != 0 )
|
---|
| 435 | goto cleanup;
|
---|
| 436 |
|
---|
| 437 | ret = mbedtls_poly1305_update( &ctx, input, ilen );
|
---|
| 438 | if( ret != 0 )
|
---|
| 439 | goto cleanup;
|
---|
| 440 |
|
---|
| 441 | ret = mbedtls_poly1305_finish( &ctx, mac );
|
---|
| 442 |
|
---|
| 443 | cleanup:
|
---|
| 444 | mbedtls_poly1305_free( &ctx );
|
---|
| 445 | return( ret );
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 | #endif /* MBEDTLS_POLY1305_ALT */
|
---|
| 449 |
|
---|
| 450 | #if defined(MBEDTLS_SELF_TEST)
|
---|
| 451 |
|
---|
| 452 | static const unsigned char test_keys[2][32] =
|
---|
| 453 | {
|
---|
| 454 | {
|
---|
| 455 | 0x85, 0xd6, 0xbe, 0x78, 0x57, 0x55, 0x6d, 0x33,
|
---|
| 456 | 0x7f, 0x44, 0x52, 0xfe, 0x42, 0xd5, 0x06, 0xa8,
|
---|
| 457 | 0x01, 0x03, 0x80, 0x8a, 0xfb, 0x0d, 0xb2, 0xfd,
|
---|
| 458 | 0x4a, 0xbf, 0xf6, 0xaf, 0x41, 0x49, 0xf5, 0x1b
|
---|
| 459 | },
|
---|
| 460 | {
|
---|
| 461 | 0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a,
|
---|
| 462 | 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
|
---|
| 463 | 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09,
|
---|
| 464 | 0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0
|
---|
| 465 | }
|
---|
| 466 | };
|
---|
| 467 |
|
---|
| 468 | static const unsigned char test_data[2][127] =
|
---|
| 469 | {
|
---|
| 470 | {
|
---|
| 471 | 0x43, 0x72, 0x79, 0x70, 0x74, 0x6f, 0x67, 0x72,
|
---|
| 472 | 0x61, 0x70, 0x68, 0x69, 0x63, 0x20, 0x46, 0x6f,
|
---|
| 473 | 0x72, 0x75, 0x6d, 0x20, 0x52, 0x65, 0x73, 0x65,
|
---|
| 474 | 0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6f,
|
---|
| 475 | 0x75, 0x70
|
---|
| 476 | },
|
---|
| 477 | {
|
---|
| 478 | 0x27, 0x54, 0x77, 0x61, 0x73, 0x20, 0x62, 0x72,
|
---|
| 479 | 0x69, 0x6c, 0x6c, 0x69, 0x67, 0x2c, 0x20, 0x61,
|
---|
| 480 | 0x6e, 0x64, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
|
---|
| 481 | 0x6c, 0x69, 0x74, 0x68, 0x79, 0x20, 0x74, 0x6f,
|
---|
| 482 | 0x76, 0x65, 0x73, 0x0a, 0x44, 0x69, 0x64, 0x20,
|
---|
| 483 | 0x67, 0x79, 0x72, 0x65, 0x20, 0x61, 0x6e, 0x64,
|
---|
| 484 | 0x20, 0x67, 0x69, 0x6d, 0x62, 0x6c, 0x65, 0x20,
|
---|
| 485 | 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x77,
|
---|
| 486 | 0x61, 0x62, 0x65, 0x3a, 0x0a, 0x41, 0x6c, 0x6c,
|
---|
| 487 | 0x20, 0x6d, 0x69, 0x6d, 0x73, 0x79, 0x20, 0x77,
|
---|
| 488 | 0x65, 0x72, 0x65, 0x20, 0x74, 0x68, 0x65, 0x20,
|
---|
| 489 | 0x62, 0x6f, 0x72, 0x6f, 0x67, 0x6f, 0x76, 0x65,
|
---|
| 490 | 0x73, 0x2c, 0x0a, 0x41, 0x6e, 0x64, 0x20, 0x74,
|
---|
| 491 | 0x68, 0x65, 0x20, 0x6d, 0x6f, 0x6d, 0x65, 0x20,
|
---|
| 492 | 0x72, 0x61, 0x74, 0x68, 0x73, 0x20, 0x6f, 0x75,
|
---|
| 493 | 0x74, 0x67, 0x72, 0x61, 0x62, 0x65, 0x2e
|
---|
| 494 | }
|
---|
| 495 | };
|
---|
| 496 |
|
---|
| 497 | static const size_t test_data_len[2] =
|
---|
| 498 | {
|
---|
| 499 | 34U,
|
---|
| 500 | 127U
|
---|
| 501 | };
|
---|
| 502 |
|
---|
| 503 | static const unsigned char test_mac[2][16] =
|
---|
| 504 | {
|
---|
| 505 | {
|
---|
| 506 | 0xa8, 0x06, 0x1d, 0xc1, 0x30, 0x51, 0x36, 0xc6,
|
---|
| 507 | 0xc2, 0x2b, 0x8b, 0xaf, 0x0c, 0x01, 0x27, 0xa9
|
---|
| 508 | },
|
---|
| 509 | {
|
---|
| 510 | 0x45, 0x41, 0x66, 0x9a, 0x7e, 0xaa, 0xee, 0x61,
|
---|
| 511 | 0xe7, 0x08, 0xdc, 0x7c, 0xbc, 0xc5, 0xeb, 0x62
|
---|
| 512 | }
|
---|
| 513 | };
|
---|
| 514 |
|
---|
| 515 | #define ASSERT( cond, args ) \
|
---|
| 516 | do \
|
---|
| 517 | { \
|
---|
| 518 | if( ! ( cond ) ) \
|
---|
| 519 | { \
|
---|
| 520 | if( verbose != 0 ) \
|
---|
| 521 | mbedtls_printf args; \
|
---|
| 522 | \
|
---|
| 523 | return( -1 ); \
|
---|
| 524 | } \
|
---|
| 525 | } \
|
---|
| 526 | while( 0 )
|
---|
| 527 |
|
---|
| 528 | int mbedtls_poly1305_self_test( int verbose )
|
---|
| 529 | {
|
---|
| 530 | unsigned char mac[16];
|
---|
| 531 | unsigned i;
|
---|
| 532 | int ret;
|
---|
| 533 |
|
---|
| 534 | for( i = 0U; i < 2U; i++ )
|
---|
| 535 | {
|
---|
| 536 | if( verbose != 0 )
|
---|
| 537 | mbedtls_printf( " Poly1305 test %u ", i );
|
---|
| 538 |
|
---|
| 539 | ret = mbedtls_poly1305_mac( test_keys[i],
|
---|
| 540 | test_data[i],
|
---|
| 541 | test_data_len[i],
|
---|
| 542 | mac );
|
---|
| 543 | ASSERT( 0 == ret, ( "error code: %i\n", ret ) );
|
---|
| 544 |
|
---|
| 545 | ASSERT( 0 == memcmp( mac, test_mac[i], 16U ), ( "failed (mac)\n" ) );
|
---|
| 546 |
|
---|
| 547 | if( verbose != 0 )
|
---|
| 548 | mbedtls_printf( "passed\n" );
|
---|
| 549 | }
|
---|
| 550 |
|
---|
| 551 | if( verbose != 0 )
|
---|
| 552 | mbedtls_printf( "\n" );
|
---|
| 553 |
|
---|
| 554 | return( 0 );
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 | #endif /* MBEDTLS_SELF_TEST */
|
---|
| 558 |
|
---|
| 559 | #endif /* MBEDTLS_POLY1305_C */
|
---|