include/mbedtls/dhm.h - third_party/github/ARMmbed/mbedtls - Git at Google

 /**
  * \file dhm.h
  *
  * \brief Diffie-Hellman-Merkle key exchange
  *
  *  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)
  */
 #ifndef MBEDTLS_DHM_H
 #define MBEDTLS_DHM_H

 #include "bignum.h"

 /*
  * DHM Error codes
  */
 #define MBEDTLS_ERR_DHM_BAD_INPUT_DATA                    -0x3080  /**< Bad input parameters to function. */
 #define MBEDTLS_ERR_DHM_READ_PARAMS_FAILED                -0x3100  /**< Reading of the DHM parameters failed. */
 #define MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED                -0x3180  /**< Making of the DHM parameters failed. */
 #define MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED                -0x3200  /**< Reading of the public values failed. */
 #define MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED                -0x3280  /**< Making of the public value failed. */
 #define MBEDTLS_ERR_DHM_CALC_SECRET_FAILED                -0x3300  /**< Calculation of the DHM secret failed. */
 #define MBEDTLS_ERR_DHM_INVALID_FORMAT                    -0x3380  /**< The ASN.1 data is not formatted correctly. */
 #define MBEDTLS_ERR_DHM_ALLOC_FAILED                      -0x3400  /**< Allocation of memory failed. */
 #define MBEDTLS_ERR_DHM_FILE_IO_ERROR                     -0x3480  /**< Read/write of file failed. */

 /**
  * RFC 3526 defines a number of standardized Diffie-Hellman groups
  * for IKE.
  * RFC 5114 defines a number of standardized Diffie-Hellman groups
  * that can be used.
  *
  * Some are included here for convenience.
  *
  * Included are:
  *  RFC 3526 3.    2048-bit MODP Group
  *  RFC 3526 4.    3072-bit MODP Group
  *  RFC 3526 5.    4096-bit MODP Group
  *  RFC 5114 2.2.  2048-bit MODP Group with 224-bit Prime Order Subgroup
  */
 #define MBEDTLS_DHM_RFC3526_MODP_2048_P               \
     "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
     "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
     "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
     "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
     "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
     "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
     "83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
     "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
     "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
     "DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
     "15728E5A8AACAA68FFFFFFFFFFFFFFFF"

 #define MBEDTLS_DHM_RFC3526_MODP_2048_G          "02"

 #define MBEDTLS_DHM_RFC3526_MODP_3072_P               \
     "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
     "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
     "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
     "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
     "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
     "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
     "83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
     "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
     "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
     "DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
     "15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64" \
     "ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7" \
     "ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B" \
     "F12FFA06D98A0864D87602733EC86A64521F2B18177B200C" \
     "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31" \
     "43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF"

 #define MBEDTLS_DHM_RFC3526_MODP_3072_G          "02"

 #define MBEDTLS_DHM_RFC3526_MODP_4096_P                \
     "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
     "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
     "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
     "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
     "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
     "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
     "83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
     "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
     "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
     "DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
     "15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64" \
     "ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7" \
     "ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B" \
     "F12FFA06D98A0864D87602733EC86A64521F2B18177B200C" \
     "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31" \
     "43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7" \
     "88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA" \
     "2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6" \
     "287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED" \
     "1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9" \
     "93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199" \
     "FFFFFFFFFFFFFFFF"

 #define MBEDTLS_DHM_RFC3526_MODP_4096_G          "02"

 #define MBEDTLS_DHM_RFC5114_MODP_2048_P               \
     "AD107E1E9123A9D0D660FAA79559C51FA20D64E5683B9FD1" \
     "B54B1597B61D0A75E6FA141DF95A56DBAF9A3C407BA1DF15" \
     "EB3D688A309C180E1DE6B85A1274A0A66D3F8152AD6AC212" \
     "9037C9EDEFDA4DF8D91E8FEF55B7394B7AD5B7D0B6C12207" \
     "C9F98D11ED34DBF6C6BA0B2C8BBC27BE6A00E0A0B9C49708" \
     "B3BF8A317091883681286130BC8985DB1602E714415D9330" \
     "278273C7DE31EFDC7310F7121FD5A07415987D9ADC0A486D" \
     "CDF93ACC44328387315D75E198C641A480CD86A1B9E587E8" \
     "BE60E69CC928B2B9C52172E413042E9B23F10B0E16E79763" \
     "C9B53DCF4BA80A29E3FB73C16B8E75B97EF363E2FFA31F71" \
     "CF9DE5384E71B81C0AC4DFFE0C10E64F"

 #define MBEDTLS_DHM_RFC5114_MODP_2048_G              \
     "AC4032EF4F2D9AE39DF30B5C8FFDAC506CDEBE7B89998CAF"\
     "74866A08CFE4FFE3A6824A4E10B9A6F0DD921F01A70C4AFA"\
     "AB739D7700C29F52C57DB17C620A8652BE5E9001A8D66AD7"\
     "C17669101999024AF4D027275AC1348BB8A762D0521BC98A"\
     "E247150422EA1ED409939D54DA7460CDB5F6C6B250717CBE"\
     "F180EB34118E98D119529A45D6F834566E3025E316A330EF"\
     "BB77A86F0C1AB15B051AE3D428C8F8ACB70A8137150B8EEB"\
     "10E183EDD19963DDD9E263E4770589EF6AA21E7F5F2FF381"\
     "B539CCE3409D13CD566AFBB48D6C019181E1BCFE94B30269"\
     "EDFE72FE9B6AA4BD7B5A0F1C71CFFF4C19C418E1F6EC0179"\
     "81BC087F2A7065B384B890D3191F2BFA"

 #ifdef __cplusplus
 extern "C" {
 #endif

 /**
  * \brief          DHM context structure
  */
 typedef struct
 {
     size_t len; /*!<  size(P) in chars  */
     mbedtls_mpi P;      /*!<  prime modulus     */
     mbedtls_mpi G;      /*!<  generator         */
     mbedtls_mpi X;      /*!<  secret value      */
     mbedtls_mpi GX;     /*!<  self = G^X mod P  */
     mbedtls_mpi GY;     /*!<  peer = G^Y mod P  */
     mbedtls_mpi K;      /*!<  key = GY^X mod P  */
     mbedtls_mpi RP;     /*!<  cached R^2 mod P  */
     mbedtls_mpi Vi;     /*!<  blinding value    */
     mbedtls_mpi Vf;     /*!<  un-blinding value */
     mbedtls_mpi pX;     /*!<  previous X        */
 }
 mbedtls_dhm_context;

 /**
  * \brief          Initialize DHM context
  *
  * \param ctx      DHM context to be initialized
  */
 void mbedtls_dhm_init( mbedtls_dhm_context *ctx );

 /**
  * \brief          Parse the ServerKeyExchange parameters
  *
  * \param ctx      DHM context
  * \param p        &(start of input buffer)
  * \param end      end of buffer
  *
  * \return         0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
  */
 int mbedtls_dhm_read_params( mbedtls_dhm_context *ctx,
                      unsigned char **p,
                      const unsigned char *end );

 /**
  * \brief          Setup and write the ServerKeyExchange parameters
  *
  * \param ctx      DHM context
  * \param x_size   private value size in bytes
  * \param output   destination buffer
  * \param olen     number of chars written
  * \param f_rng    RNG function
  * \param p_rng    RNG parameter
  *
  * \note           This function assumes that ctx->P and ctx->G
  *                 have already been properly set (for example
  *                 using mbedtls_mpi_read_string or mbedtls_mpi_read_binary).
  *
  * \return         0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
  */
 int mbedtls_dhm_make_params( mbedtls_dhm_context *ctx, int x_size,
                      unsigned char *output, size_t *olen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

 /**
  * \brief          Import the peer's public value G^Y
  *
  * \param ctx      DHM context
  * \param input    input buffer
  * \param ilen     size of buffer
  *
  * \return         0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
  */
 int mbedtls_dhm_read_public( mbedtls_dhm_context *ctx,
                      const unsigned char *input, size_t ilen );

 /**
  * \brief          Create own private value X and export G^X
  *
  * \param ctx      DHM context
  * \param x_size   private value size in bytes
  * \param output   destination buffer
  * \param olen     must be equal to ctx->P.len
  * \param f_rng    RNG function
  * \param p_rng    RNG parameter
  *
  * \return         0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
  */
 int mbedtls_dhm_make_public( mbedtls_dhm_context *ctx, int x_size,
                      unsigned char *output, size_t olen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

 /**
  * \brief          Derive and export the shared secret (G^Y)^X mod P
  *
  * \param ctx      DHM context
  * \param output   destination buffer
  * \param output_size   size of the destination buffer
  * \param olen     on exit, holds the actual number of bytes written
  * \param f_rng    RNG function, for blinding purposes
  * \param p_rng    RNG parameter
  *
  * \return         0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
  *
  * \note           If non-NULL, f_rng is used to blind the input as
  *                 countermeasure against timing attacks. Blinding is
  *                 automatically used if and only if our secret value X is
  *                 re-used and costs nothing otherwise, so it is recommended
  *                 to always pass a non-NULL f_rng argument.
  */
 int mbedtls_dhm_calc_secret( mbedtls_dhm_context *ctx,
                      unsigned char *output, size_t output_size, size_t *olen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

 /**
  * \brief          Free and clear the components of a DHM key
  *
  * \param ctx      DHM context to free and clear
  */
 void mbedtls_dhm_free( mbedtls_dhm_context *ctx );

 #if defined(MBEDTLS_ASN1_PARSE_C)
 /** \ingroup x509_module */
 /**
  * \brief          Parse DHM parameters in PEM or DER format
  *
  * \param dhm      DHM context to be initialized
  * \param dhmin    input buffer
  * \param dhminlen size of the buffer
  *                 (including the terminating null byte for PEM data)
  *
  * \return         0 if successful, or a specific DHM or PEM error code
  */
 int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,
                    size_t dhminlen );

 #if defined(MBEDTLS_FS_IO)
 /** \ingroup x509_module */
 /**
  * \brief          Load and parse DHM parameters
  *
  * \param dhm      DHM context to be initialized
  * \param path     filename to read the DHM Parameters from
  *
  * \return         0 if successful, or a specific DHM or PEM error code
  */
 int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path );
 #endif /* MBEDTLS_FS_IO */
 #endif /* MBEDTLS_ASN1_PARSE_C */

 /**
  * \brief          Checkup routine
  *
  * \return         0 if successful, or 1 if the test failed
  */
 int mbedtls_dhm_self_test( int verbose );

 #ifdef __cplusplus
 }
 #endif

 #endif /* dhm.h */
	/**
	* \file dhm.h
	*
	* \brief Diffie-Hellman-Merkle key exchange
	*
	* 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)
	*/
	#ifndef MBEDTLS_DHM_H
	#define MBEDTLS_DHM_H

	#include "bignum.h"

	/*
	* DHM Error codes
	*/
	#define MBEDTLS_ERR_DHM_BAD_INPUT_DATA -0x3080 /*< Bad input parameters to function. /
	#define MBEDTLS_ERR_DHM_READ_PARAMS_FAILED -0x3100 /*< Reading of the DHM parameters failed. /
	#define MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED -0x3180 /*< Making of the DHM parameters failed. /
	#define MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED -0x3200 /*< Reading of the public values failed. /
	#define MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED -0x3280 /*< Making of the public value failed. /
	#define MBEDTLS_ERR_DHM_CALC_SECRET_FAILED -0x3300 /*< Calculation of the DHM secret failed. /
	#define MBEDTLS_ERR_DHM_INVALID_FORMAT -0x3380 /*< The ASN.1 data is not formatted correctly. /
	#define MBEDTLS_ERR_DHM_ALLOC_FAILED -0x3400 /*< Allocation of memory failed. /
	#define MBEDTLS_ERR_DHM_FILE_IO_ERROR -0x3480 /*< Read/write of file failed. /

	/**
	* RFC 3526 defines a number of standardized Diffie-Hellman groups
	* for IKE.
	* RFC 5114 defines a number of standardized Diffie-Hellman groups
	* that can be used.
	*
	* Some are included here for convenience.
	*
	* Included are:
	* RFC 3526 3. 2048-bit MODP Group
	* RFC 3526 4. 3072-bit MODP Group
	* RFC 3526 5. 4096-bit MODP Group
	* RFC 5114 2.2. 2048-bit MODP Group with 224-bit Prime Order Subgroup
	*/
	#define MBEDTLS_DHM_RFC3526_MODP_2048_P \
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
	"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
	"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
	"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
	"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
	"DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
	"15728E5A8AACAA68FFFFFFFFFFFFFFFF"

	#define MBEDTLS_DHM_RFC3526_MODP_2048_G "02"

	#define MBEDTLS_DHM_RFC3526_MODP_3072_P \
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
	"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
	"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
	"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
	"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
	"DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
	"15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64" \
	"ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7" \
	"ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B" \
	"F12FFA06D98A0864D87602733EC86A64521F2B18177B200C" \
	"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31" \
	"43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF"

	#define MBEDTLS_DHM_RFC3526_MODP_3072_G "02"

	#define MBEDTLS_DHM_RFC3526_MODP_4096_P \
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
	"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
	"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
	"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" \
	"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" \
	"DE2BCBF6955817183995497CEA956AE515D2261898FA0510" \
	"15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64" \
	"ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7" \
	"ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B" \
	"F12FFA06D98A0864D87602733EC86A64521F2B18177B200C" \
	"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31" \
	"43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7" \
	"88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA" \
	"2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6" \
	"287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED" \
	"1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9" \
	"93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199" \
	"FFFFFFFFFFFFFFFF"

	#define MBEDTLS_DHM_RFC3526_MODP_4096_G "02"

	#define MBEDTLS_DHM_RFC5114_MODP_2048_P \
	"AD107E1E9123A9D0D660FAA79559C51FA20D64E5683B9FD1" \
	"B54B1597B61D0A75E6FA141DF95A56DBAF9A3C407BA1DF15" \
	"EB3D688A309C180E1DE6B85A1274A0A66D3F8152AD6AC212" \
	"9037C9EDEFDA4DF8D91E8FEF55B7394B7AD5B7D0B6C12207" \
	"C9F98D11ED34DBF6C6BA0B2C8BBC27BE6A00E0A0B9C49708" \
	"B3BF8A317091883681286130BC8985DB1602E714415D9330" \
	"278273C7DE31EFDC7310F7121FD5A07415987D9ADC0A486D" \
	"CDF93ACC44328387315D75E198C641A480CD86A1B9E587E8" \
	"BE60E69CC928B2B9C52172E413042E9B23F10B0E16E79763" \
	"C9B53DCF4BA80A29E3FB73C16B8E75B97EF363E2FFA31F71" \
	"CF9DE5384E71B81C0AC4DFFE0C10E64F"

	#define MBEDTLS_DHM_RFC5114_MODP_2048_G \
	"AC4032EF4F2D9AE39DF30B5C8FFDAC506CDEBE7B89998CAF"\
	"74866A08CFE4FFE3A6824A4E10B9A6F0DD921F01A70C4AFA"\
	"AB739D7700C29F52C57DB17C620A8652BE5E9001A8D66AD7"\
	"C17669101999024AF4D027275AC1348BB8A762D0521BC98A"\
	"E247150422EA1ED409939D54DA7460CDB5F6C6B250717CBE"\
	"F180EB34118E98D119529A45D6F834566E3025E316A330EF"\
	"BB77A86F0C1AB15B051AE3D428C8F8ACB70A8137150B8EEB"\
	"10E183EDD19963DDD9E263E4770589EF6AA21E7F5F2FF381"\
	"B539CCE3409D13CD566AFBB48D6C019181E1BCFE94B30269"\
	"EDFE72FE9B6AA4BD7B5A0F1C71CFFF4C19C418E1F6EC0179"\
	"81BC087F2A7065B384B890D3191F2BFA"

	#ifdef __cplusplus
	extern "C" {
	#endif

	/**
	* \brief DHM context structure
	*/
	typedef struct
	{
	size_t len; /!< size(P) in chars /
	mbedtls_mpi P; /!< prime modulus /
	mbedtls_mpi G; /!< generator /
	mbedtls_mpi X; /!< secret value /
	mbedtls_mpi GX; /!< self = G^X mod P /
	mbedtls_mpi GY; /!< peer = G^Y mod P /
	mbedtls_mpi K; /!< key = GY^X mod P /
	mbedtls_mpi RP; /!< cached R^2 mod P /
	mbedtls_mpi Vi; /!< blinding value /
	mbedtls_mpi Vf; /!< un-blinding value /
	mbedtls_mpi pX; /!< previous X /
	}
	mbedtls_dhm_context;

	/**
	* \brief Initialize DHM context
	*
	* \param ctx DHM context to be initialized
	*/
	void mbedtls_dhm_init( mbedtls_dhm_context *ctx );

	/**
	* \brief Parse the ServerKeyExchange parameters
	*
	* \param ctx DHM context
	* \param p &(start of input buffer)
	* \param end end of buffer
	*
	* \return 0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
	*/
	int mbedtls_dhm_read_params( mbedtls_dhm_context *ctx,
	unsigned char **p,
	const unsigned char *end );

	/**
	* \brief Setup and write the ServerKeyExchange parameters
	*
	* \param ctx DHM context
	* \param x_size private value size in bytes
	* \param output destination buffer
	* \param olen number of chars written
	* \param f_rng RNG function
	* \param p_rng RNG parameter
	*
	* \note This function assumes that ctx->P and ctx->G
	* have already been properly set (for example
	* using mbedtls_mpi_read_string or mbedtls_mpi_read_binary).
	*
	* \return 0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
	*/
	int mbedtls_dhm_make_params( mbedtls_dhm_context *ctx, int x_size,
	unsigned char output, size_t olen,
	int (f_rng)(void , unsigned char *, size_t),
	void *p_rng );

	/**
	* \brief Import the peer's public value G^Y
	*
	* \param ctx DHM context
	* \param input input buffer
	* \param ilen size of buffer
	*
	* \return 0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
	*/
	int mbedtls_dhm_read_public( mbedtls_dhm_context *ctx,
	const unsigned char *input, size_t ilen );

	/**
	* \brief Create own private value X and export G^X
	*
	* \param ctx DHM context
	* \param x_size private value size in bytes
	* \param output destination buffer
	* \param olen must be equal to ctx->P.len
	* \param f_rng RNG function
	* \param p_rng RNG parameter
	*
	* \return 0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
	*/
	int mbedtls_dhm_make_public( mbedtls_dhm_context *ctx, int x_size,
	unsigned char *output, size_t olen,
	int (f_rng)(void , unsigned char *, size_t),
	void *p_rng );

	/**
	* \brief Derive and export the shared secret (G^Y)^X mod P
	*
	* \param ctx DHM context
	* \param output destination buffer
	* \param output_size size of the destination buffer
	* \param olen on exit, holds the actual number of bytes written
	* \param f_rng RNG function, for blinding purposes
	* \param p_rng RNG parameter
	*
	* \return 0 if successful, or an MBEDTLS_ERR_DHM_XXX error code
	*
	* \note If non-NULL, f_rng is used to blind the input as
	* countermeasure against timing attacks. Blinding is
	* automatically used if and only if our secret value X is
	* re-used and costs nothing otherwise, so it is recommended
	* to always pass a non-NULL f_rng argument.
	*/
	int mbedtls_dhm_calc_secret( mbedtls_dhm_context *ctx,
	unsigned char output, size_t output_size, size_t olen,
	int (f_rng)(void , unsigned char *, size_t),
	void *p_rng );

	/**
	* \brief Free and clear the components of a DHM key
	*
	* \param ctx DHM context to free and clear
	*/
	void mbedtls_dhm_free( mbedtls_dhm_context *ctx );

	#if defined(MBEDTLS_ASN1_PARSE_C)
	/** \ingroup x509_module */
	/**
	* \brief Parse DHM parameters in PEM or DER format
	*
	* \param dhm DHM context to be initialized
	* \param dhmin input buffer
	* \param dhminlen size of the buffer
	* (including the terminating null byte for PEM data)
	*
	* \return 0 if successful, or a specific DHM or PEM error code
	*/
	int mbedtls_dhm_parse_dhm( mbedtls_dhm_context dhm, const unsigned char dhmin,
	size_t dhminlen );

	#if defined(MBEDTLS_FS_IO)
	/** \ingroup x509_module */
	/**
	* \brief Load and parse DHM parameters
	*
	* \param dhm DHM context to be initialized
	* \param path filename to read the DHM Parameters from
	*
	* \return 0 if successful, or a specific DHM or PEM error code
	*/
	int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context dhm, const char path );
	#endif /* MBEDTLS_FS_IO */
	#endif /* MBEDTLS_ASN1_PARSE_C */

	/**
	* \brief Checkup routine
	*
	* \return 0 if successful, or 1 if the test failed
	*/
	int mbedtls_dhm_self_test( int verbose );

	#ifdef __cplusplus
	}
	#endif

	#endif /* dhm.h */