diff options
Diffstat (limited to 'libotr/libgcrypt-1.8.7/cipher/poly1305.c')
| -rw-r--r-- | libotr/libgcrypt-1.8.7/cipher/poly1305.c | 643 |
1 files changed, 643 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/cipher/poly1305.c b/libotr/libgcrypt-1.8.7/cipher/poly1305.c new file mode 100644 index 0000000..22255fb --- /dev/null +++ b/libotr/libgcrypt-1.8.7/cipher/poly1305.c @@ -0,0 +1,643 @@ +/* poly1305.c - Poly1305 internals and generic implementation + * Copyright (C) 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> + * + * This file is part of Libgcrypt. + * + * Libgcrypt is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser general Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Libgcrypt is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +/* The code is based on public-domain Poly1305 implementation by + * Andrew Moon at + * https://github.com/floodyberry/poly1305-opt + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "types.h" +#include "g10lib.h" +#include "cipher.h" +#include "bufhelp.h" +#include "poly1305-internal.h" + + +static const char *selftest (void); + + + +#ifdef POLY1305_USE_SSE2 + +void _gcry_poly1305_amd64_sse2_init_ext(void *state, const poly1305_key_t *key) + OPS_FUNC_ABI; +unsigned int _gcry_poly1305_amd64_sse2_finish_ext(void *state, const byte *m, + size_t remaining, + byte mac[16]) OPS_FUNC_ABI; +unsigned int _gcry_poly1305_amd64_sse2_blocks(void *ctx, const byte *m, + size_t bytes) OPS_FUNC_ABI; + +static const poly1305_ops_t poly1305_amd64_sse2_ops = { + POLY1305_SSE2_BLOCKSIZE, + _gcry_poly1305_amd64_sse2_init_ext, + _gcry_poly1305_amd64_sse2_blocks, + _gcry_poly1305_amd64_sse2_finish_ext +}; + +#else /* !POLY1305_USE_SSE2 */ + +static OPS_FUNC_ABI void poly1305_init_ext_ref32 +/**/ (void *state, const poly1305_key_t *key); +static OPS_FUNC_ABI unsigned int poly1305_blocks_ref32 +/**/ (void *state, const byte *m, size_t bytes); +static OPS_FUNC_ABI unsigned int poly1305_finish_ext_ref32 +/**/ (void *state, const byte * m, + size_t remaining, byte mac[POLY1305_TAGLEN]); + +static const poly1305_ops_t poly1305_default_ops = { + POLY1305_REF_BLOCKSIZE, + poly1305_init_ext_ref32, + poly1305_blocks_ref32, + poly1305_finish_ext_ref32 +}; + +#endif /* !POLY1305_USE_SSE2 */ + + +#ifdef POLY1305_USE_AVX2 + +void _gcry_poly1305_amd64_avx2_init_ext(void *state, const poly1305_key_t *key) + OPS_FUNC_ABI; +unsigned int _gcry_poly1305_amd64_avx2_finish_ext(void *state, const byte *m, + size_t remaining, + byte mac[16]) OPS_FUNC_ABI; +unsigned int _gcry_poly1305_amd64_avx2_blocks(void *ctx, const byte *m, + size_t bytes) OPS_FUNC_ABI; + +static const poly1305_ops_t poly1305_amd64_avx2_ops = { + POLY1305_AVX2_BLOCKSIZE, + _gcry_poly1305_amd64_avx2_init_ext, + _gcry_poly1305_amd64_avx2_blocks, + _gcry_poly1305_amd64_avx2_finish_ext +}; + +#endif + + +#ifdef POLY1305_USE_NEON + +void _gcry_poly1305_armv7_neon_init_ext(void *state, const poly1305_key_t *key) + OPS_FUNC_ABI; +unsigned int _gcry_poly1305_armv7_neon_finish_ext(void *state, const byte *m, + size_t remaining, + byte mac[16]) OPS_FUNC_ABI; +unsigned int _gcry_poly1305_armv7_neon_blocks(void *ctx, const byte *m, + size_t bytes) OPS_FUNC_ABI; + +static const poly1305_ops_t poly1305_armv7_neon_ops = { + POLY1305_NEON_BLOCKSIZE, + _gcry_poly1305_armv7_neon_init_ext, + _gcry_poly1305_armv7_neon_blocks, + _gcry_poly1305_armv7_neon_finish_ext +}; + +#endif + + +/* Reference unoptimized poly1305 implementation using 32 bit * 32 bit = 64 bit + * multiplication and 64 bit addition. + */ + +typedef struct poly1305_state_ref32_s +{ + u32 r[5]; + u32 h[5]; + u32 pad[4]; + byte final; +} poly1305_state_ref32_t; + + +#ifndef POLY1305_USE_SSE2 +static OPS_FUNC_ABI void +poly1305_init_ext_ref32 (void *state, const poly1305_key_t * key) +{ + poly1305_state_ref32_t *st = (poly1305_state_ref32_t *) state; + + gcry_assert (sizeof (*st) + POLY1305_STATE_ALIGNMENT <= + sizeof (((poly1305_context_t *) 0)->state)); + + /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ + st->r[0] = (buf_get_le32 (&key->b[0])) & 0x3ffffff; + st->r[1] = (buf_get_le32 (&key->b[3]) >> 2) & 0x3ffff03; + st->r[2] = (buf_get_le32 (&key->b[6]) >> 4) & 0x3ffc0ff; + st->r[3] = (buf_get_le32 (&key->b[9]) >> 6) & 0x3f03fff; + st->r[4] = (buf_get_le32 (&key->b[12]) >> 8) & 0x00fffff; + + /* h = 0 */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + st->h[3] = 0; + st->h[4] = 0; + + /* save pad for later */ + st->pad[0] = buf_get_le32 (&key->b[16]); + st->pad[1] = buf_get_le32 (&key->b[20]); + st->pad[2] = buf_get_le32 (&key->b[24]); + st->pad[3] = buf_get_le32 (&key->b[28]); + + st->final = 0; +} +#endif /* !POLY1305_USE_SSE2 */ + + +#ifndef POLY1305_USE_SSE2 +static OPS_FUNC_ABI unsigned int +poly1305_blocks_ref32 (void *state, const byte * m, size_t bytes) +{ + poly1305_state_ref32_t *st = (poly1305_state_ref32_t *) state; + const u32 hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */ + u32 r0, r1, r2, r3, r4; + u32 s1, s2, s3, s4; + u32 h0, h1, h2, h3, h4; + u64 d0, d1, d2, d3, d4; + u32 c; + + r0 = st->r[0]; + r1 = st->r[1]; + r2 = st->r[2]; + r3 = st->r[3]; + r4 = st->r[4]; + + s1 = r1 * 5; + s2 = r2 * 5; + s3 = r3 * 5; + s4 = r4 * 5; + + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + h3 = st->h[3]; + h4 = st->h[4]; + + while (bytes >= POLY1305_REF_BLOCKSIZE) + { + /* h += m[i] */ + h0 += (buf_get_le32 (m + 0)) & 0x3ffffff; + h1 += (buf_get_le32 (m + 3) >> 2) & 0x3ffffff; + h2 += (buf_get_le32 (m + 6) >> 4) & 0x3ffffff; + h3 += (buf_get_le32 (m + 9) >> 6) & 0x3ffffff; + h4 += (buf_get_le32 (m + 12) >> 8) | hibit; + + /* h *= r */ + d0 = + ((u64) h0 * r0) + ((u64) h1 * s4) + + ((u64) h2 * s3) + ((u64) h3 * s2) + ((u64) h4 * s1); + d1 = + ((u64) h0 * r1) + ((u64) h1 * r0) + + ((u64) h2 * s4) + ((u64) h3 * s3) + ((u64) h4 * s2); + d2 = + ((u64) h0 * r2) + ((u64) h1 * r1) + + ((u64) h2 * r0) + ((u64) h3 * s4) + ((u64) h4 * s3); + d3 = + ((u64) h0 * r3) + ((u64) h1 * r2) + + ((u64) h2 * r1) + ((u64) h3 * r0) + ((u64) h4 * s4); + d4 = + ((u64) h0 * r4) + ((u64) h1 * r3) + + ((u64) h2 * r2) + ((u64) h3 * r1) + ((u64) h4 * r0); + + /* (partial) h %= p */ + c = (u32) (d0 >> 26); + h0 = (u32) d0 & 0x3ffffff; + d1 += c; + c = (u32) (d1 >> 26); + h1 = (u32) d1 & 0x3ffffff; + d2 += c; + c = (u32) (d2 >> 26); + h2 = (u32) d2 & 0x3ffffff; + d3 += c; + c = (u32) (d3 >> 26); + h3 = (u32) d3 & 0x3ffffff; + d4 += c; + c = (u32) (d4 >> 26); + h4 = (u32) d4 & 0x3ffffff; + h0 += c * 5; + c = (h0 >> 26); + h0 = h0 & 0x3ffffff; + h1 += c; + + m += POLY1305_REF_BLOCKSIZE; + bytes -= POLY1305_REF_BLOCKSIZE; + } + + st->h[0] = h0; + st->h[1] = h1; + st->h[2] = h2; + st->h[3] = h3; + st->h[4] = h4; + + return (16 * sizeof (u32) + 5 * sizeof (u64) + 5 * sizeof (void *)); +} +#endif /* !POLY1305_USE_SSE2 */ + + +#ifndef POLY1305_USE_SSE2 +static OPS_FUNC_ABI unsigned int +poly1305_finish_ext_ref32 (void *state, const byte * m, + size_t remaining, byte mac[POLY1305_TAGLEN]) +{ + poly1305_state_ref32_t *st = (poly1305_state_ref32_t *) state; + u32 h0, h1, h2, h3, h4, c; + u32 g0, g1, g2, g3, g4; + u64 f; + u32 mask; + unsigned int burn = 0; + + /* process the remaining block */ + if (remaining) + { + byte final[POLY1305_REF_BLOCKSIZE] = { 0 }; + size_t i; + for (i = 0; i < remaining; i++) + final[i] = m[i]; + final[remaining] = 1; + st->final = 1; + burn = poly1305_blocks_ref32 (st, final, POLY1305_REF_BLOCKSIZE); + } + + /* fully carry h */ + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + h3 = st->h[3]; + h4 = st->h[4]; + + c = h1 >> 26; + h1 = h1 & 0x3ffffff; + h2 += c; + c = h2 >> 26; + h2 = h2 & 0x3ffffff; + h3 += c; + c = h3 >> 26; + h3 = h3 & 0x3ffffff; + h4 += c; + c = h4 >> 26; + h4 = h4 & 0x3ffffff; + h0 += c * 5; + c = h0 >> 26; + h0 = h0 & 0x3ffffff; + h1 += c; + + /* compute h + -p */ + g0 = h0 + 5; + c = g0 >> 26; + g0 &= 0x3ffffff; + g1 = h1 + c; + c = g1 >> 26; + g1 &= 0x3ffffff; + g2 = h2 + c; + c = g2 >> 26; + g2 &= 0x3ffffff; + g3 = h3 + c; + c = g3 >> 26; + g3 &= 0x3ffffff; + g4 = h4 + c - (1 << 26); + + /* select h if h < p, or h + -p if h >= p */ + mask = (g4 >> ((sizeof (u32) * 8) - 1)) - 1; + g0 &= mask; + g1 &= mask; + g2 &= mask; + g3 &= mask; + g4 &= mask; + mask = ~mask; + h0 = (h0 & mask) | g0; + h1 = (h1 & mask) | g1; + h2 = (h2 & mask) | g2; + h3 = (h3 & mask) | g3; + h4 = (h4 & mask) | g4; + + /* h = h % (2^128) */ + h0 = ((h0) | (h1 << 26)) & 0xffffffff; + h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff; + h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff; + h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff; + + /* mac = (h + pad) % (2^128) */ + f = (u64) h0 + st->pad[0]; + h0 = (u32) f; + f = (u64) h1 + st->pad[1] + (f >> 32); + h1 = (u32) f; + f = (u64) h2 + st->pad[2] + (f >> 32); + h2 = (u32) f; + f = (u64) h3 + st->pad[3] + (f >> 32); + h3 = (u32) f; + + buf_put_le32 (mac + 0, h0); + buf_put_le32 (mac + 4, h1); + buf_put_le32 (mac + 8, h2); + buf_put_le32 (mac + 12, h3); + + /* zero out the state */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + st->h[3] = 0; + st->h[4] = 0; + st->r[0] = 0; + st->r[1] = 0; + st->r[2] = 0; + st->r[3] = 0; + st->r[4] = 0; + st->pad[0] = 0; + st->pad[1] = 0; + st->pad[2] = 0; + st->pad[3] = 0; + + /* burn_stack */ + return (13 * sizeof (u32) + sizeof (u64) + + POLY1305_REF_BLOCKSIZE + 6 * sizeof (void *)) + burn; +} +#endif /* !POLY1305_USE_SSE2*/ + + + + + +static inline void * +poly1305_get_state (poly1305_context_t * ctx) +{ + byte *c = ctx->state; + c += POLY1305_STATE_ALIGNMENT - 1; + c -= (uintptr_t) c & (POLY1305_STATE_ALIGNMENT - 1); + return c; +} + + +static void +poly1305_init (poly1305_context_t * ctx, const poly1305_key_t * key) +{ + void *state = poly1305_get_state (ctx); + + ctx->leftover = 0; + + ctx->ops->init_ext (state, key); +} + + +void +_gcry_poly1305_update (poly1305_context_t * ctx, const byte * m, size_t bytes) +{ + void *state = poly1305_get_state (ctx); + unsigned int burn = 0; + size_t block_size = ctx->ops->block_size; + + /* handle leftover */ + if (ctx->leftover) + { + size_t want = (block_size - ctx->leftover); + if (want > bytes) + want = bytes; + buf_cpy (ctx->buffer + ctx->leftover, m, want); + bytes -= want; + m += want; + ctx->leftover += want; + if (ctx->leftover < block_size) + return; + burn = ctx->ops->blocks (state, ctx->buffer, block_size); + ctx->leftover = 0; + } + + /* process full blocks */ + if (bytes >= block_size) + { + size_t want = (bytes & ~(block_size - 1)); + burn = ctx->ops->blocks (state, m, want); + m += want; + bytes -= want; + } + + /* store leftover */ + if (bytes) + { + buf_cpy (ctx->buffer + ctx->leftover, m, bytes); + ctx->leftover += bytes; + } + + if (burn) + _gcry_burn_stack (burn); +} + + +void +_gcry_poly1305_finish (poly1305_context_t * ctx, byte mac[POLY1305_TAGLEN]) +{ + void *state = poly1305_get_state (ctx); + unsigned int burn; + + burn = ctx->ops->finish_ext (state, ctx->buffer, ctx->leftover, mac); + + _gcry_burn_stack (burn); +} + + +gcry_err_code_t +_gcry_poly1305_init (poly1305_context_t * ctx, const byte * key, + size_t keylen) +{ + static int initialized; + static const char *selftest_failed; + poly1305_key_t keytmp; + unsigned int features = _gcry_get_hw_features (); + + if (!initialized) + { + initialized = 1; + selftest_failed = selftest (); + if (selftest_failed) + log_error ("Poly1305 selftest failed (%s)\n", selftest_failed); + } + + if (keylen != POLY1305_KEYLEN) + return GPG_ERR_INV_KEYLEN; + + if (selftest_failed) + return GPG_ERR_SELFTEST_FAILED; + +#ifdef POLY1305_USE_SSE2 + ctx->ops = &poly1305_amd64_sse2_ops; +#else + ctx->ops = &poly1305_default_ops; +#endif + +#ifdef POLY1305_USE_AVX2 + if (features & HWF_INTEL_AVX2) + ctx->ops = &poly1305_amd64_avx2_ops; +#endif +#ifdef POLY1305_USE_NEON + if (features & HWF_ARM_NEON) + ctx->ops = &poly1305_armv7_neon_ops; +#endif + (void)features; + + buf_cpy (keytmp.b, key, POLY1305_KEYLEN); + poly1305_init (ctx, &keytmp); + + wipememory (&keytmp, sizeof (keytmp)); + + return 0; +} + + +static void +poly1305_auth (byte mac[POLY1305_TAGLEN], const byte * m, size_t bytes, + const byte * key) +{ + poly1305_context_t ctx; + + memset (&ctx, 0, sizeof (ctx)); + + _gcry_poly1305_init (&ctx, key, POLY1305_KEYLEN); + _gcry_poly1305_update (&ctx, m, bytes); + _gcry_poly1305_finish (&ctx, mac); + + wipememory (&ctx, sizeof (ctx)); +} + + +static const char * +selftest (void) +{ + /* example from nacl */ + static const byte nacl_key[POLY1305_KEYLEN] = { + 0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91, + 0x6d, 0x11, 0xc2, 0xcb, 0x21, 0x4d, 0x3c, 0x25, + 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23, 0x4e, 0x65, + 0x2d, 0x65, 0x1f, 0xa4, 0xc8, 0xcf, 0xf8, 0x80, + }; + + static const byte nacl_msg[131] = { + 0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, + 0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc, 0x76, 0xce, + 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4, + 0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a, + 0xc0, 0xdf, 0xc1, 0x7c, 0x98, 0xdc, 0xe8, 0x7b, + 0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72, + 0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2, + 0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38, + 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7, 0xcc, 0x8a, + 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, + 0x90, 0x22, 0x43, 0x68, 0x51, 0x7a, 0xcf, 0xea, + 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda, + 0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde, + 0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3, + 0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6, + 0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74, + 0xe3, 0x55, 0xa5 + }; + + static const byte nacl_mac[16] = { + 0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5, + 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9 + }; + + /* generates a final value of (2^130 - 2) == 3 */ + static const byte wrap_key[POLY1305_KEYLEN] = { + 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + + static const byte wrap_msg[16] = { + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff + }; + + static const byte wrap_mac[16] = { + 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + + /* mac of the macs of messages of length 0 to 256, where the key and messages + * have all their values set to the length + */ + static const byte total_key[POLY1305_KEYLEN] = { + 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff + }; + + static const byte total_mac[16] = { + 0x64, 0xaf, 0xe2, 0xe8, 0xd6, 0xad, 0x7b, 0xbd, + 0xd2, 0x87, 0xf9, 0x7c, 0x44, 0x62, 0x3d, 0x39 + }; + + poly1305_context_t ctx; + poly1305_context_t total_ctx; + byte all_key[POLY1305_KEYLEN]; + byte all_msg[256]; + byte mac[16]; + size_t i, j; + + memset (&ctx, 0, sizeof (ctx)); + memset (&total_ctx, 0, sizeof (total_ctx)); + + memset (mac, 0, sizeof (mac)); + poly1305_auth (mac, nacl_msg, sizeof (nacl_msg), nacl_key); + if (memcmp (nacl_mac, mac, sizeof (nacl_mac)) != 0) + return "Poly1305 test 1 failed."; + + /* SSE2/AVX have a 32 byte block size, but also support 64 byte blocks, so + * make sure everything still works varying between them */ + memset (mac, 0, sizeof (mac)); + _gcry_poly1305_init (&ctx, nacl_key, POLY1305_KEYLEN); + _gcry_poly1305_update (&ctx, nacl_msg + 0, 32); + _gcry_poly1305_update (&ctx, nacl_msg + 32, 64); + _gcry_poly1305_update (&ctx, nacl_msg + 96, 16); + _gcry_poly1305_update (&ctx, nacl_msg + 112, 8); + _gcry_poly1305_update (&ctx, nacl_msg + 120, 4); + _gcry_poly1305_update (&ctx, nacl_msg + 124, 2); + _gcry_poly1305_update (&ctx, nacl_msg + 126, 1); + _gcry_poly1305_update (&ctx, nacl_msg + 127, 1); + _gcry_poly1305_update (&ctx, nacl_msg + 128, 1); + _gcry_poly1305_update (&ctx, nacl_msg + 129, 1); + _gcry_poly1305_update (&ctx, nacl_msg + 130, 1); + _gcry_poly1305_finish (&ctx, mac); + if (memcmp (nacl_mac, mac, sizeof (nacl_mac)) != 0) + return "Poly1305 test 2 failed."; + + memset (mac, 0, sizeof (mac)); + poly1305_auth (mac, wrap_msg, sizeof (wrap_msg), wrap_key); + if (memcmp (wrap_mac, mac, sizeof (nacl_mac)) != 0) + return "Poly1305 test 3 failed."; + + _gcry_poly1305_init (&total_ctx, total_key, POLY1305_KEYLEN); + for (i = 0; i < 256; i++) + { + /* set key and message to 'i,i,i..' */ + for (j = 0; j < sizeof (all_key); j++) + all_key[j] = i; + for (j = 0; j < i; j++) + all_msg[j] = i; + poly1305_auth (mac, all_msg, i, all_key); + _gcry_poly1305_update (&total_ctx, mac, 16); + } + _gcry_poly1305_finish (&total_ctx, mac); + if (memcmp (total_mac, mac, sizeof (total_mac)) != 0) + return "Poly1305 test 4 failed."; + + return NULL; +} |