/* * NIST SP800-38D compliant GCM implementation * * Copyright (C) 2006-2013, Brainspark B.V. * * This file is part of PolarSSL (http://www.polarssl.org) * Lead Maintainer: Paul Bakker * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* * http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf * * See also: * [MGV] http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf * * We use the algorithm described as Shoup's method with 4-bit tables in * [MGV] 4.1, pp. 12-13, to enhance speed without using too much memory. */ #include "polarssl/config.h" #if defined(POLARSSL_GCM_C) #include "polarssl/gcm.h" /* * 32-bit integer manipulation macros (big endian) */ #ifndef GET_UINT32_BE #define GET_UINT32_BE(n,b,i) \ { \ (n) = ( (uint32_t) (b)[(i) ] << 24 ) \ | ( (uint32_t) (b)[(i) + 1] << 16 ) \ | ( (uint32_t) (b)[(i) + 2] << 8 ) \ | ( (uint32_t) (b)[(i) + 3] ); \ } #endif #ifndef PUT_UINT32_BE #define PUT_UINT32_BE(n,b,i) \ { \ (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ (b)[(i) + 3] = (unsigned char) ( (n) ); \ } #endif /* * Precompute small multiples of H, that is set * HH[i] || HL[i] = H times i, * where i is seen as a field element as in [MGV], ie high-order bits * correspond to low powers of P. The result is stored in the same way, that * is the high-order bit of HH corresponds to P^0 and the low-order bit of HL * corresponds to P^127. */ static int gcm_gen_table( gcm_context *ctx ) { int ret, i, j; uint64_t hi, lo; uint64_t vl, vh; unsigned char h[16]; size_t olen = 0; memset( h, 0, 16 ); if( ( ret = cipher_update( &ctx->cipher_ctx, h, 16, h, &olen ) ) != 0 ) return( ret ); /* 0 corresponds to 0 in GF(2^128) */ ctx->HH[0] = 0; ctx->HL[0] = 0; GET_UINT32_BE( hi, h, 0 ); GET_UINT32_BE( lo, h, 4 ); vh = (uint64_t) hi << 32 | lo; GET_UINT32_BE( hi, h, 8 ); GET_UINT32_BE( lo, h, 12 ); vl = (uint64_t) hi << 32 | lo; /* 8 = 1000 corresponds to 1 in GF(2^128) */ ctx->HL[8] = vl; ctx->HH[8] = vh; for( i = 4; i > 0; i >>= 1 ) { uint32_t T = ( vl & 1 ) * 0xe1000000U; vl = ( vh << 63 ) | ( vl >> 1 ); vh = ( vh >> 1 ) ^ ( (uint64_t) T << 32); ctx->HL[i] = vl; ctx->HH[i] = vh; } for (i = 2; i < 16; i <<= 1 ) { uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i; vh = *HiH; vl = *HiL; for( j = 1; j < i; j++ ) { HiH[j] = vh ^ ctx->HH[j]; HiL[j] = vl ^ ctx->HL[j]; } } return( 0 ); } int gcm_init( gcm_context *ctx, cipher_id_t cipher, const unsigned char *key, unsigned int keysize ) { int ret; const cipher_info_t *cipher_info; memset( ctx, 0, sizeof(gcm_context) ); cipher_info = cipher_info_from_values( cipher, keysize, POLARSSL_MODE_ECB ); if( cipher_info == NULL ) return( POLARSSL_ERR_GCM_BAD_INPUT ); if( cipher_info->block_size != 16 ) return( POLARSSL_ERR_GCM_BAD_INPUT ); if( ( ret = cipher_init_ctx( &ctx->cipher_ctx, cipher_info ) ) != 0 ) return( ret ); if( ( ret = cipher_setkey( &ctx->cipher_ctx, key, keysize, POLARSSL_ENCRYPT ) ) != 0 ) { return( ret ); } if( ( ret = gcm_gen_table( ctx ) ) != 0 ) return( ret ); return( 0 ); } /* * Shoup's method for multiplication use this table with * last4[x] = x times P^128 * where x and last4[x] are seen as elements of GF(2^128) as in [MGV] */ static const uint64_t last4[16] = { 0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0, 0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0 }; /* * Sets output to x times H using the precomputed tables. * x and output are seen as elements of GF(2^128) as in [MGV]. */ static void gcm_mult( gcm_context *ctx, const unsigned char x[16], unsigned char output[16] ) { int i = 0; unsigned char z[16]; unsigned char lo, hi, rem; uint64_t zh, zl; memset( z, 0x00, 16 ); lo = x[15] & 0xf; hi = x[15] >> 4; zh = ctx->HH[lo]; zl = ctx->HL[lo]; for( i = 15; i >= 0; i-- ) { lo = x[i] & 0xf; hi = x[i] >> 4; if( i != 15 ) { rem = (unsigned char) zl & 0xf; zl = ( zh << 60 ) | ( zl >> 4 ); zh = ( zh >> 4 ); zh ^= (uint64_t) last4[rem] << 48; zh ^= ctx->HH[lo]; zl ^= ctx->HL[lo]; } rem = (unsigned char) zl & 0xf; zl = ( zh << 60 ) | ( zl >> 4 ); zh = ( zh >> 4 ); zh ^= (uint64_t) last4[rem] << 48; zh ^= ctx->HH[hi]; zl ^= ctx->HL[hi]; } PUT_UINT32_BE( zh >> 32, output, 0 ); PUT_UINT32_BE( zh, output, 4 ); PUT_UINT32_BE( zl >> 32, output, 8 ); PUT_UINT32_BE( zl, output, 12 ); } int gcm_starts( gcm_context *ctx, int mode, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len ) { int ret; unsigned char work_buf[16]; size_t i; const unsigned char *p; size_t use_len, olen = 0; memset( ctx->y, 0x00, sizeof(ctx->y) ); memset( ctx->buf, 0x00, sizeof(ctx->buf) ); ctx->mode = mode; ctx->len = 0; ctx->add_len = 0; if( iv_len == 12 ) { memcpy( ctx->y, iv, iv_len ); ctx->y[15] = 1; } else { memset( work_buf, 0x00, 16 ); PUT_UINT32_BE( iv_len * 8, work_buf, 12 ); p = iv; while( iv_len > 0 ) { use_len = ( iv_len < 16 ) ? iv_len : 16; for( i = 0; i < use_len; i++ ) ctx->y[i] ^= p[i]; gcm_mult( ctx, ctx->y, ctx->y ); iv_len -= use_len; p += use_len; } for( i = 0; i < 16; i++ ) ctx->y[i] ^= work_buf[i]; gcm_mult( ctx, ctx->y, ctx->y ); } if( ( ret = cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->base_ectr, &olen ) ) != 0 ) { return( ret ); } ctx->add_len = add_len; p = add; while( add_len > 0 ) { use_len = ( add_len < 16 ) ? add_len : 16; for( i = 0; i < use_len; i++ ) ctx->buf[i] ^= p[i]; gcm_mult( ctx, ctx->buf, ctx->buf ); add_len -= use_len; p += use_len; } return( 0 ); } int gcm_update( gcm_context *ctx, size_t length, const unsigned char *input, unsigned char *output ) { int ret; unsigned char ectr[16]; size_t i; const unsigned char *p; unsigned char *out_p = output; size_t use_len, olen = 0; if( output > input && (size_t) ( output - input ) < length ) return( POLARSSL_ERR_GCM_BAD_INPUT ); ctx->len += length; p = input; while( length > 0 ) { use_len = ( length < 16 ) ? length : 16; for( i = 16; i > 12; i-- ) if( ++ctx->y[i - 1] != 0 ) break; if( ( ret = cipher_update( &ctx->cipher_ctx, ctx->y, 16, ectr, &olen ) ) != 0 ) { return( ret ); } for( i = 0; i < use_len; i++ ) { if( ctx->mode == GCM_DECRYPT ) ctx->buf[i] ^= p[i]; out_p[i] = ectr[i] ^ p[i]; if( ctx->mode == GCM_ENCRYPT ) ctx->buf[i] ^= out_p[i]; } gcm_mult( ctx, ctx->buf, ctx->buf ); length -= use_len; p += use_len; out_p += use_len; } return( 0 ); } int gcm_finish( gcm_context *ctx, unsigned char *tag, size_t tag_len ) { unsigned char work_buf[16]; size_t i; uint64_t orig_len = ctx->len * 8; uint64_t orig_add_len = ctx->add_len * 8; if( tag_len > 16 ) return( POLARSSL_ERR_GCM_BAD_INPUT ); if( tag_len != 0 ) memcpy( tag, ctx->base_ectr, tag_len ); if( orig_len || orig_add_len ) { memset( work_buf, 0x00, 16 ); PUT_UINT32_BE( ( orig_add_len >> 32 ), work_buf, 0 ); PUT_UINT32_BE( ( orig_add_len ), work_buf, 4 ); PUT_UINT32_BE( ( orig_len >> 32 ), work_buf, 8 ); PUT_UINT32_BE( ( orig_len ), work_buf, 12 ); for( i = 0; i < 16; i++ ) ctx->buf[i] ^= work_buf[i]; gcm_mult( ctx, ctx->buf, ctx->buf ); for( i = 0; i < tag_len; i++ ) tag[i] ^= ctx->buf[i]; } return( 0 ); } int gcm_crypt_and_tag( gcm_context *ctx, int mode, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, size_t tag_len, unsigned char *tag ) { int ret; if( ( ret = gcm_starts( ctx, mode, iv, iv_len, add, add_len ) ) != 0 ) return( ret ); if( ( ret = gcm_update( ctx, length, input, output ) ) != 0 ) return( ret ); if( ( ret = gcm_finish( ctx, tag, tag_len ) ) != 0 ) return( ret ); return( 0 ); } int gcm_auth_decrypt( gcm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *tag, size_t tag_len, const unsigned char *input, unsigned char *output ) { unsigned char check_tag[16]; size_t i; int diff; gcm_crypt_and_tag( ctx, GCM_DECRYPT, length, iv, iv_len, add, add_len, input, output, tag_len, check_tag ); /* Check tag in "constant-time" */ for( diff = 0, i = 0; i < tag_len; i++ ) diff |= tag[i] ^ check_tag[i]; if( diff != 0 ) { memset( output, 0, length ); return( POLARSSL_ERR_GCM_AUTH_FAILED ); } return( 0 ); } void gcm_free( gcm_context *ctx ) { (void) cipher_free_ctx( &ctx->cipher_ctx ); memset( ctx, 0, sizeof( gcm_context ) ); } #if defined(POLARSSL_SELF_TEST) && defined(POLARSSL_AES_C) #include /* * AES-GCM test vectors from: * * http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip */ #define MAX_TESTS 6 int key_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 }; unsigned char key[MAX_TESTS][32] = { { 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, 0x00 }, { 0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08 }, }; size_t iv_len[MAX_TESTS] = { 12, 12, 12, 12, 8, 60 }; int iv_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 2 }; unsigned char iv[MAX_TESTS][64] = { { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, { 0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde, 0xca, 0xf8, 0x88 }, { 0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5, 0x55, 0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa, 0x6a, 0x7a, 0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1, 0xe4, 0xc3, 0x03, 0xd2, 0xa3, 0x18, 0xa7, 0x28, 0xc3, 0xc0, 0xc9, 0x51, 0x56, 0x80, 0x95, 0x39, 0xfc, 0xf0, 0xe2, 0x42, 0x9a, 0x6b, 0x52, 0x54, 0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde, 0x6a, 0x57, 0xa6, 0x37, 0xb3, 0x9b }, }; size_t add_len[MAX_TESTS] = { 0, 0, 0, 20, 20, 20 }; int add_index[MAX_TESTS] = { 0, 0, 0, 1, 1, 1 }; unsigned char additional[MAX_TESTS][64] = { { 0x00 }, { 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad, 0xda, 0xd2 }, }; size_t pt_len[MAX_TESTS] = { 0, 16, 64, 60, 60, 60 }; int pt_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 }; unsigned char pt[MAX_TESTS][64] = { { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, { 0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55 }, }; unsigned char ct[MAX_TESTS * 3][64] = { { 0x00 }, { 0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92, 0xf3, 0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78 }, { 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59, 0x85 }, { 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91 }, { 0x61, 0x35, 0x3b, 0x4c, 0x28, 0x06, 0x93, 0x4a, 0x77, 0x7f, 0xf5, 0x1f, 0xa2, 0x2a, 0x47, 0x55, 0x69, 0x9b, 0x2a, 0x71, 0x4f, 0xcd, 0xc6, 0xf8, 0x37, 0x66, 0xe5, 0xf9, 0x7b, 0x6c, 0x74, 0x23, 0x73, 0x80, 0x69, 0x00, 0xe4, 0x9f, 0x24, 0xb2, 0x2b, 0x09, 0x75, 0x44, 0xd4, 0x89, 0x6b, 0x42, 0x49, 0x89, 0xb5, 0xe1, 0xeb, 0xac, 0x0f, 0x07, 0xc2, 0x3f, 0x45, 0x98 }, { 0x8c, 0xe2, 0x49, 0x98, 0x62, 0x56, 0x15, 0xb6, 0x03, 0xa0, 0x33, 0xac, 0xa1, 0x3f, 0xb8, 0x94, 0xbe, 0x91, 0x12, 0xa5, 0xc3, 0xa2, 0x11, 0xa8, 0xba, 0x26, 0x2a, 0x3c, 0xca, 0x7e, 0x2c, 0xa7, 0x01, 0xe4, 0xa9, 0xa4, 0xfb, 0xa4, 0x3c, 0x90, 0xcc, 0xdc, 0xb2, 0x81, 0xd4, 0x8c, 0x7c, 0x6f, 0xd6, 0x28, 0x75, 0xd2, 0xac, 0xa4, 0x17, 0x03, 0x4c, 0x34, 0xae, 0xe5 }, { 0x00 }, { 0x98, 0xe7, 0x24, 0x7c, 0x07, 0xf0, 0xfe, 0x41, 0x1c, 0x26, 0x7e, 0x43, 0x84, 0xb0, 0xf6, 0x00 }, { 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, 0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, 0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, 0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c, 0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25, 0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47, 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9, 0xcc, 0xda, 0x27, 0x10, 0xac, 0xad, 0xe2, 0x56 }, { 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, 0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, 0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, 0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c, 0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25, 0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47, 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9, 0xcc, 0xda, 0x27, 0x10 }, { 0x0f, 0x10, 0xf5, 0x99, 0xae, 0x14, 0xa1, 0x54, 0xed, 0x24, 0xb3, 0x6e, 0x25, 0x32, 0x4d, 0xb8, 0xc5, 0x66, 0x63, 0x2e, 0xf2, 0xbb, 0xb3, 0x4f, 0x83, 0x47, 0x28, 0x0f, 0xc4, 0x50, 0x70, 0x57, 0xfd, 0xdc, 0x29, 0xdf, 0x9a, 0x47, 0x1f, 0x75, 0xc6, 0x65, 0x41, 0xd4, 0xd4, 0xda, 0xd1, 0xc9, 0xe9, 0x3a, 0x19, 0xa5, 0x8e, 0x8b, 0x47, 0x3f, 0xa0, 0xf0, 0x62, 0xf7 }, { 0xd2, 0x7e, 0x88, 0x68, 0x1c, 0xe3, 0x24, 0x3c, 0x48, 0x30, 0x16, 0x5a, 0x8f, 0xdc, 0xf9, 0xff, 0x1d, 0xe9, 0xa1, 0xd8, 0xe6, 0xb4, 0x47, 0xef, 0x6e, 0xf7, 0xb7, 0x98, 0x28, 0x66, 0x6e, 0x45, 0x81, 0xe7, 0x90, 0x12, 0xaf, 0x34, 0xdd, 0xd9, 0xe2, 0xf0, 0x37, 0x58, 0x9b, 0x29, 0x2d, 0xb3, 0xe6, 0x7c, 0x03, 0x67, 0x45, 0xfa, 0x22, 0xe7, 0xe9, 0xb7, 0x37, 0x3b }, { 0x00 }, { 0xce, 0xa7, 0x40, 0x3d, 0x4d, 0x60, 0x6b, 0x6e, 0x07, 0x4e, 0xc5, 0xd3, 0xba, 0xf3, 0x9d, 0x18 }, { 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, 0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, 0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, 0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa, 0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d, 0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38, 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a, 0xbc, 0xc9, 0xf6, 0x62, 0x89, 0x80, 0x15, 0xad }, { 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, 0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, 0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, 0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa, 0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d, 0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38, 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a, 0xbc, 0xc9, 0xf6, 0x62 }, { 0xc3, 0x76, 0x2d, 0xf1, 0xca, 0x78, 0x7d, 0x32, 0xae, 0x47, 0xc1, 0x3b, 0xf1, 0x98, 0x44, 0xcb, 0xaf, 0x1a, 0xe1, 0x4d, 0x0b, 0x97, 0x6a, 0xfa, 0xc5, 0x2f, 0xf7, 0xd7, 0x9b, 0xba, 0x9d, 0xe0, 0xfe, 0xb5, 0x82, 0xd3, 0x39, 0x34, 0xa4, 0xf0, 0x95, 0x4c, 0xc2, 0x36, 0x3b, 0xc7, 0x3f, 0x78, 0x62, 0xac, 0x43, 0x0e, 0x64, 0xab, 0xe4, 0x99, 0xf4, 0x7c, 0x9b, 0x1f }, { 0x5a, 0x8d, 0xef, 0x2f, 0x0c, 0x9e, 0x53, 0xf1, 0xf7, 0x5d, 0x78, 0x53, 0x65, 0x9e, 0x2a, 0x20, 0xee, 0xb2, 0xb2, 0x2a, 0xaf, 0xde, 0x64, 0x19, 0xa0, 0x58, 0xab, 0x4f, 0x6f, 0x74, 0x6b, 0xf4, 0x0f, 0xc0, 0xc3, 0xb7, 0x80, 0xf2, 0x44, 0x45, 0x2d, 0xa3, 0xeb, 0xf1, 0xc5, 0xd8, 0x2c, 0xde, 0xa2, 0x41, 0x89, 0x97, 0x20, 0x0e, 0xf8, 0x2e, 0x44, 0xae, 0x7e, 0x3f }, }; unsigned char tag[MAX_TESTS * 3][16] = { { 0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61, 0x36, 0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a }, { 0xab, 0x6e, 0x47, 0xd4, 0x2c, 0xec, 0x13, 0xbd, 0xf5, 0x3a, 0x67, 0xb2, 0x12, 0x57, 0xbd, 0xdf }, { 0x4d, 0x5c, 0x2a, 0xf3, 0x27, 0xcd, 0x64, 0xa6, 0x2c, 0xf3, 0x5a, 0xbd, 0x2b, 0xa6, 0xfa, 0xb4 }, { 0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb, 0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47 }, { 0x36, 0x12, 0xd2, 0xe7, 0x9e, 0x3b, 0x07, 0x85, 0x56, 0x1b, 0xe1, 0x4a, 0xac, 0xa2, 0xfc, 0xcb }, { 0x61, 0x9c, 0xc5, 0xae, 0xff, 0xfe, 0x0b, 0xfa, 0x46, 0x2a, 0xf4, 0x3c, 0x16, 0x99, 0xd0, 0x50 }, { 0xcd, 0x33, 0xb2, 0x8a, 0xc7, 0x73, 0xf7, 0x4b, 0xa0, 0x0e, 0xd1, 0xf3, 0x12, 0x57, 0x24, 0x35 }, { 0x2f, 0xf5, 0x8d, 0x80, 0x03, 0x39, 0x27, 0xab, 0x8e, 0xf4, 0xd4, 0x58, 0x75, 0x14, 0xf0, 0xfb }, { 0x99, 0x24, 0xa7, 0xc8, 0x58, 0x73, 0x36, 0xbf, 0xb1, 0x18, 0x02, 0x4d, 0xb8, 0x67, 0x4a, 0x14 }, { 0x25, 0x19, 0x49, 0x8e, 0x80, 0xf1, 0x47, 0x8f, 0x37, 0xba, 0x55, 0xbd, 0x6d, 0x27, 0x61, 0x8c }, { 0x65, 0xdc, 0xc5, 0x7f, 0xcf, 0x62, 0x3a, 0x24, 0x09, 0x4f, 0xcc, 0xa4, 0x0d, 0x35, 0x33, 0xf8 }, { 0xdc, 0xf5, 0x66, 0xff, 0x29, 0x1c, 0x25, 0xbb, 0xb8, 0x56, 0x8f, 0xc3, 0xd3, 0x76, 0xa6, 0xd9 }, { 0x53, 0x0f, 0x8a, 0xfb, 0xc7, 0x45, 0x36, 0xb9, 0xa9, 0x63, 0xb4, 0xf1, 0xc4, 0xcb, 0x73, 0x8b }, { 0xd0, 0xd1, 0xc8, 0xa7, 0x99, 0x99, 0x6b, 0xf0, 0x26, 0x5b, 0x98, 0xb5, 0xd4, 0x8a, 0xb9, 0x19 }, { 0xb0, 0x94, 0xda, 0xc5, 0xd9, 0x34, 0x71, 0xbd, 0xec, 0x1a, 0x50, 0x22, 0x70, 0xe3, 0xcc, 0x6c }, { 0x76, 0xfc, 0x6e, 0xce, 0x0f, 0x4e, 0x17, 0x68, 0xcd, 0xdf, 0x88, 0x53, 0xbb, 0x2d, 0x55, 0x1b }, { 0x3a, 0x33, 0x7d, 0xbf, 0x46, 0xa7, 0x92, 0xc4, 0x5e, 0x45, 0x49, 0x13, 0xfe, 0x2e, 0xa8, 0xf2 }, { 0xa4, 0x4a, 0x82, 0x66, 0xee, 0x1c, 0x8e, 0xb0, 0xc8, 0xb5, 0xd4, 0xcf, 0x5a, 0xe9, 0xf1, 0x9a }, }; int gcm_self_test( int verbose ) { gcm_context ctx; unsigned char buf[64]; unsigned char tag_buf[16]; int i, j, ret; cipher_id_t cipher = POLARSSL_CIPHER_ID_AES; for( j = 0; j < 3; j++ ) { int key_len = 128 + 64 * j; for( i = 0; i < MAX_TESTS; i++ ) { if( verbose != 0 ) printf( " AES-GCM-%3d #%d (%s): ", key_len, i, "enc" ); gcm_init( &ctx, cipher, key[key_index[i]], key_len ); ret = gcm_crypt_and_tag( &ctx, GCM_ENCRYPT, pt_len[i], iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i], pt[pt_index[i]], buf, 16, tag_buf ); if( ret != 0 || memcmp( buf, ct[j * 6 + i], pt_len[i] ) != 0 || memcmp( tag_buf, tag[j * 6 + i], 16 ) != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } gcm_free( &ctx ); if( verbose != 0 ) printf( "passed\n" ); if( verbose != 0 ) printf( " AES-GCM-%3d #%d (%s): ", key_len, i, "dec" ); gcm_init( &ctx, cipher, key[key_index[i]], key_len ); ret = gcm_crypt_and_tag( &ctx, GCM_DECRYPT, pt_len[i], iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i], ct[j * 6 + i], buf, 16, tag_buf ); if( ret != 0 || memcmp( buf, pt[pt_index[i]], pt_len[i] ) != 0 || memcmp( tag_buf, tag[j * 6 + i], 16 ) != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } gcm_free( &ctx ); if( verbose != 0 ) printf( "passed\n" ); if( verbose != 0 ) printf( " AES-GCM-%3d #%d split (%s): ", key_len, i, "enc" ); gcm_init( &ctx, cipher, key[key_index[i]], key_len ); ret = gcm_starts( &ctx, GCM_ENCRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i] ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } if( pt_len[i] > 32 ) { size_t rest_len = pt_len[i] - 32; ret = gcm_update( &ctx, 32, pt[pt_index[i]], buf ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } ret = gcm_update( &ctx, rest_len, pt[pt_index[i]] + 32, buf + 32 ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } } else { ret = gcm_update( &ctx, pt_len[i], pt[pt_index[i]], buf ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } } ret = gcm_finish( &ctx, tag_buf, 16 ); if( ret != 0 || memcmp( buf, ct[j * 6 + i], pt_len[i] ) != 0 || memcmp( tag_buf, tag[j * 6 + i], 16 ) != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } gcm_free( &ctx ); if( verbose != 0 ) printf( "passed\n" ); if( verbose != 0 ) printf( " AES-GCM-%3d #%d split (%s): ", key_len, i, "dec" ); gcm_init( &ctx, cipher, key[key_index[i]], key_len ); ret = gcm_starts( &ctx, GCM_DECRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i] ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } if( pt_len[i] > 32 ) { size_t rest_len = pt_len[i] - 32; ret = gcm_update( &ctx, 32, ct[j * 6 + i], buf ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } ret = gcm_update( &ctx, rest_len, ct[j * 6 + i] + 32, buf + 32 ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } } else { ret = gcm_update( &ctx, pt_len[i], ct[j * 6 + i], buf ); if( ret != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } } ret = gcm_finish( &ctx, tag_buf, 16 ); if( ret != 0 || memcmp( buf, pt[pt_index[i]], pt_len[i] ) != 0 || memcmp( tag_buf, tag[j * 6 + i], 16 ) != 0 ) { if( verbose != 0 ) printf( "failed\n" ); return( 1 ); } gcm_free( &ctx ); if( verbose != 0 ) printf( "passed\n" ); } } if( verbose != 0 ) printf( "\n" ); return( 0 ); } #endif /* POLARSSL_SELF_TEST && POLARSSL_AES_C */ #endif