text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific
   * language governing permissions and limitations under the License.
   *
   ****************************************************************************/
  
  /*
   *  NIST SP800-38D compliant GCM implementation
   *
   *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   *  SPDX-License-Identifier: Apache-2.0
   *
   *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   *  not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   *  This file is part of mbed TLS (https://tls.mbed.org)
   */
  
  /*
   * 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 "mbedtls/config.h"
  
  #if defined(MBEDTLS_GCM_C)
  
  #include "mbedtls/gcm.h"
  
  #include <string.h>
  
  #if defined(MBEDTLS_AESNI_C)
  #include "mbedtls/aesni.h"
  #endif
  
  #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
  #if defined(MBEDTLS_PLATFORM_C)
  #include "mbedtls/platform.h"
  #else
  #include <stdio.h>
  #define mbedtls_printf printf
  #endif							/* MBEDTLS_PLATFORM_C */
  #endif							/* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
  
  /*
   * 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
  
  /* Implementation that should never be optimized out by the compiler */
  static void mbedtls_zeroize(void *v, size_t n)
  {
  	volatile unsigned char *p = v;
  	while (n--) {
  		*p++ = 0;
  	}
  }
  
  /*
   * Initialize a context
   */
  void mbedtls_gcm_init(mbedtls_gcm_context *ctx)
  {
  	memset(ctx, 0, sizeof(mbedtls_gcm_context));
  }
  
  /*
   * 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(mbedtls_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 = mbedtls_cipher_update(&ctx->cipher_ctx, h, 16, h, &olen)) != 0) {
  		return (ret);
  	}
  
  	/* pack h as two 64-bits ints, big-endian */
  	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;
  
  #if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
  	/* With CLMUL support, we need only h, not the rest of the table */
  	if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
  		return (0);
  	}
  #endif
  
  	/* 0 corresponds to 0 in GF(2^128) */
  	ctx->HH[0] = 0;
  	ctx->HL[0] = 0;
  
  	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 <= 8; i *= 2) {
  		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 mbedtls_gcm_setkey(mbedtls_gcm_context *ctx, mbedtls_cipher_id_t cipher, const unsigned char *key, unsigned int keybits)
  {
  	int ret;
  	const mbedtls_cipher_info_t *cipher_info;
  
  	cipher_info = mbedtls_cipher_info_from_values(cipher, keybits, MBEDTLS_MODE_ECB);
  	if (cipher_info == NULL) {
  		return (MBEDTLS_ERR_GCM_BAD_INPUT);
  	}
  
  	if (cipher_info->block_size != 16) {
  		return (MBEDTLS_ERR_GCM_BAD_INPUT);
  	}
  
  	mbedtls_cipher_free(&ctx->cipher_ctx);
  
  	if ((ret = mbedtls_cipher_setup(&ctx->cipher_ctx, cipher_info)) != 0) {
  		return (ret);
  	}
  
  	if ((ret = mbedtls_cipher_setkey(&ctx->cipher_ctx, key, keybits, MBEDTLS_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(mbedtls_gcm_context *ctx, const unsigned char x[16], unsigned char output[16])
  {
  	int i = 0;
  	unsigned char lo, hi, rem;
  	uint64_t zh, zl;
  
  #if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
  	if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
  		unsigned char h[16];
  
  		PUT_UINT32_BE(ctx->HH[8] >> 32, h, 0);
  		PUT_UINT32_BE(ctx->HH[8], h, 4);
  		PUT_UINT32_BE(ctx->HL[8] >> 32, h, 8);
  		PUT_UINT32_BE(ctx->HL[8], h, 12);
  
  		mbedtls_aesni_gcm_mult(output, x, h);
  		return;
  	}
  #endif							/* MBEDTLS_AESNI_C && MBEDTLS_HAVE_X86_64 */
  
  	lo = x[15] & 0xf;
  
  	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 mbedtls_gcm_starts(mbedtls_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;
  
  	/* IV and AD are limited to 2^64 bits, so 2^61 bytes */
  	if (((uint64_t)iv_len) >> 61 != 0 || ((uint64_t)add_len) >> 61 != 0) {
  		return (MBEDTLS_ERR_GCM_BAD_INPUT);
  	}
  
  	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 = mbedtls_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 mbedtls_gcm_update(mbedtls_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 (MBEDTLS_ERR_GCM_BAD_INPUT);
  	}
  
  	/* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes
  	 * Also check for possible overflow */
  	if (ctx->len + length < ctx->len || (uint64_t)ctx->len + length > 0xFFFFFFFE0ull) {
  		return (MBEDTLS_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 = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ectr, &olen)) != 0) {
  			return (ret);
  		}
  
  		for (i = 0; i < use_len; i++) {
  			if (ctx->mode == MBEDTLS_GCM_DECRYPT) {
  				ctx->buf[i] ^= p[i];
  			}
  			out_p[i] = ectr[i] ^ p[i];
  			if (ctx->mode == MBEDTLS_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 mbedtls_gcm_finish(mbedtls_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 || tag_len < 4) {
  		return (MBEDTLS_ERR_GCM_BAD_INPUT);
  	}
  
  	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 mbedtls_gcm_crypt_and_tag(mbedtls_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 = mbedtls_gcm_starts(ctx, mode, iv, iv_len, add, add_len)) != 0) {
  		return (ret);
  	}
  
  	if ((ret = mbedtls_gcm_update(ctx, length, input, output)) != 0) {
  		return (ret);
  	}
  
  	if ((ret = mbedtls_gcm_finish(ctx, tag, tag_len)) != 0) {
  		return (ret);
  	}
  
  	return (0);
  }
  
  int mbedtls_gcm_auth_decrypt(mbedtls_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)
  {
  	int ret;
  	unsigned char check_tag[16];
  	size_t i;
  	int diff;
  
  	if ((ret = mbedtls_gcm_crypt_and_tag(ctx, MBEDTLS_GCM_DECRYPT, length, iv, iv_len, add, add_len, input, output, tag_len, check_tag)) != 0) {
  		return (ret);
  	}
  
  	/* Check tag in "constant-time" */
  	for (diff = 0, i = 0; i < tag_len; i++) {
  		diff |= tag[i] ^ check_tag[i];
  	}
  
  	if (diff != 0) {
  		mbedtls_zeroize(output, length);
  		return (MBEDTLS_ERR_GCM_AUTH_FAILED);
  	}
  
  	return (0);
  }
  
  void mbedtls_gcm_free(mbedtls_gcm_context *ctx)
  {
  	mbedtls_cipher_free(&ctx->cipher_ctx);
  	mbedtls_zeroize(ctx, sizeof(mbedtls_gcm_context));
  }
  
  #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
  /*
   * AES-GCM test vectors from:
   *
   * http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip
   */
  #define MAX_TESTS   6
  
  static const int key_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 };
  
  static const 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
  	},
  };
  
  static const size_t iv_len[MAX_TESTS] = { 12, 12, 12, 12, 8, 60 };
  
  static const int iv_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 2 };
  
  static const 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
  	},
  };
  
  static const size_t add_len[MAX_TESTS] = { 0, 0, 0, 20, 20, 20 };
  
  static const int add_index[MAX_TESTS] = { 0, 0, 0, 1, 1, 1 };
  
  static const 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
  	},
  };
  
  static const size_t pt_len[MAX_TESTS] = { 0, 16, 64, 60, 60, 60 };
  
  static const int pt_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 };
  
  static const 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
  	},
  };
  
  static const 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
  	},
  };
  
  static const 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 mbedtls_gcm_self_test(int verbose)
  {
  	mbedtls_gcm_context ctx;
  	unsigned char buf[64];
  	unsigned char tag_buf[16];
  	int i, j, ret;
  	mbedtls_cipher_id_t cipher = MBEDTLS_CIPHER_ID_AES;
  
  	mbedtls_gcm_init(&ctx);
  
  	for (j = 0; j < 3; j++) {
  		int key_len = 128 + 64 * j;
  
  		for (i = 0; i < MAX_TESTS; i++) {
  			if (verbose != 0) {
  				mbedtls_printf("  AES-GCM-%3d #%d (%s): ", key_len, i, "enc");
  			}
  
  			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);
  
  			ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_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) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			mbedtls_gcm_free(&ctx);
  
  			if (verbose != 0) {
  				mbedtls_printf("passed\n");
  			}
  
  			if (verbose != 0) {
  				mbedtls_printf("  AES-GCM-%3d #%d (%s): ", key_len, i, "dec");
  			}
  
  			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);
  
  			ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_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) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			mbedtls_gcm_free(&ctx);
  
  			if (verbose != 0) {
  				mbedtls_printf("passed\n");
  			}
  
  			if (verbose != 0) {
  				mbedtls_printf("  AES-GCM-%3d #%d split (%s): ", key_len, i, "enc");
  			}
  
  			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);
  
  			ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_ENCRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i]);
  			if (ret != 0) {
  				if (verbose != 0) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			if (pt_len[i] > 32) {
  				size_t rest_len = pt_len[i] - 32;
  				ret = mbedtls_gcm_update(&ctx, 32, pt[pt_index[i]], buf);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  
  				ret = mbedtls_gcm_update(&ctx, rest_len, pt[pt_index[i]] + 32, buf + 32);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  			} else {
  				ret = mbedtls_gcm_update(&ctx, pt_len[i], pt[pt_index[i]], buf);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  			}
  
  			ret = mbedtls_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) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			mbedtls_gcm_free(&ctx);
  
  			if (verbose != 0) {
  				mbedtls_printf("passed\n");
  			}
  
  			if (verbose != 0) {
  				mbedtls_printf("  AES-GCM-%3d #%d split (%s): ", key_len, i, "dec");
  			}
  
  			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);
  
  			ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_DECRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i]);
  			if (ret != 0) {
  				if (verbose != 0) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			if (pt_len[i] > 32) {
  				size_t rest_len = pt_len[i] - 32;
  				ret = mbedtls_gcm_update(&ctx, 32, ct[j * 6 + i], buf);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  
  				ret = mbedtls_gcm_update(&ctx, rest_len, ct[j * 6 + i] + 32, buf + 32);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  			} else {
  				ret = mbedtls_gcm_update(&ctx, pt_len[i], ct[j * 6 + i], buf);
  				if (ret != 0) {
  					if (verbose != 0) {
  						mbedtls_printf("failed\n");
  					}
  
  					return (1);
  				}
  			}
  
  			ret = mbedtls_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) {
  					mbedtls_printf("failed\n");
  				}
  
  				return (1);
  			}
  
  			mbedtls_gcm_free(&ctx);
  
  			if (verbose != 0) {
  				mbedtls_printf("passed\n");
  			}
  
  		}
  	}
  
  	if (verbose != 0) {
  		mbedtls_printf("\n");
  	}
  
  	return (0);
  }
  
  #endif							/* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
  
  #endif							/* MBEDTLS_GCM_C */
  