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Edit File : dh.h \| Size : 16.36 KB
/* crypto/dh/dh.h / / Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] / #ifndef HEADER_DH_H # define HEADER_DH_H # include <openssl/e_os2.h> # ifdef OPENSSL_NO_DH # error DH is disabled. # endif # ifndef OPENSSL_NO_BIO # include <openssl/bio.h> # endif # include <openssl/ossl_typ.h> # ifndef OPENSSL_NO_DEPRECATED # include <openssl/bn.h> # endif # ifndef OPENSSL_DH_MAX_MODULUS_BITS # define OPENSSL_DH_MAX_MODULUS_BITS 10000 # endif # define DH_FLAG_CACHE_MONT_P 0x01 / * new with 0.9.7h; the built-in DH * implementation now uses constant time * modular exponentiation for secret exponents * by default. This flag causes the * faster variable sliding window method to * be used for all exponents. / # define DH_FLAG_NO_EXP_CONSTTIME 0x02 / * If this flag is set the DH method is FIPS compliant and can be used in * FIPS mode. This is set in the validated module method. If an application * sets this flag in its own methods it is its reposibility to ensure the * result is compliant. / # define DH_FLAG_FIPS_METHOD 0x0400 / * If this flag is set the operations normally disabled in FIPS mode are * permitted it is then the applications responsibility to ensure that the * usage is compliant. / # define DH_FLAG_NON_FIPS_ALLOW 0x0400 #ifdef __cplusplus extern "C" { #endif / Already defined in ossl_typ.h / / typedef struct dh_st DH; / / typedef struct dh_method DH_METHOD; / struct dh_method { const char name; /* Methods here / int (generate_key) (DH dh); int (compute_key) (unsigned char key, const BIGNUM pub_key, DH dh); / Can be null / int (bn_mod_exp) (const DH dh, BIGNUM r, const BIGNUM a, const BIGNUM p, const BIGNUM m, BN_CTX ctx, BN_MONT_CTX m_ctx); int (init) (DH dh); int (finish) (DH dh); int flags; char app_data; /* If this is non-NULL, it will be used to generate parameters / int (generate_params) (DH dh, int prime_len, int generator, BN_GENCB cb); }; struct dh_st { /* * This first argument is used to pick up errors when a DH is passed * instead of a EVP_PKEY / int pad; int version; BIGNUM p; BIGNUM g; long length; / optional / BIGNUM pub_key; /* g^x % p / BIGNUM priv_key; /* x / int flags; BN_MONT_CTX method_mont_p; /* Place holders if we want to do X9.42 DH / BIGNUM q; BIGNUM j; unsigned char seed; int seedlen; BIGNUM counter; int references; CRYPTO_EX_DATA ex_data; const DH_METHOD meth; ENGINE engine; }; # define DH_GENERATOR_2 2 / #define DH_GENERATOR_3 3 / # define DH_GENERATOR_5 5 / DH_check error codes / # define DH_CHECK_P_NOT_PRIME 0x01 # define DH_CHECK_P_NOT_SAFE_PRIME 0x02 # define DH_UNABLE_TO_CHECK_GENERATOR 0x04 # define DH_NOT_SUITABLE_GENERATOR 0x08 # define DH_CHECK_Q_NOT_PRIME 0x10 # define DH_CHECK_INVALID_Q_VALUE 0x20 # define DH_CHECK_INVALID_J_VALUE 0x40 / DH_check_pub_key error codes / # define DH_CHECK_PUBKEY_TOO_SMALL 0x01 # define DH_CHECK_PUBKEY_TOO_LARGE 0x02 # define DH_CHECK_PUBKEY_INVALID 0x04 / * primes p where (p-1)/2 is prime too are called "safe"; we define this for * backward compatibility: / # define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME # define d2i_DHparams_fp(fp,x) \ (DH )ASN1_d2i_fp((char ()())DH_new, \ (char ()())d2i_DHparams, \ (fp), \ (unsigned char *)(x)) # define i2d_DHparams_fp(fp,x) \ ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char )(x)) # define d2i_DHparams_bio(bp,x) \ ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x) # define i2d_DHparams_bio(bp,x) \ ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x) # define d2i_DHxparams_fp(fp,x) \ (DH )ASN1_d2i_fp((char ()())DH_new, \ (char ()())d2i_DHxparams, \ (fp), \ (unsigned char )(x)) # define i2d_DHxparams_fp(fp,x) \ ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char )(x)) # define d2i_DHxparams_bio(bp,x) \ ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x) # define i2d_DHxparams_bio(bp,x) \ ASN1_i2d_bio_of_const(DH, i2d_DHxparams, bp, x) DH DHparams_dup(DH ); const DH_METHOD DH_OpenSSL(void); void DH_set_default_method(const DH_METHOD meth); const DH_METHOD DH_get_default_method(void); int DH_set_method(DH dh, const DH_METHOD meth); DH DH_new_method(ENGINE engine); DH DH_new(void); void DH_free(DH dh); int DH_up_ref(DH dh); int DH_size(const DH dh); int DH_get_ex_new_index(long argl, void argp, CRYPTO_EX_new new_func, CRYPTO_EX_dup dup_func, CRYPTO_EX_free free_func); int DH_set_ex_data(DH d, int idx, void arg); void DH_get_ex_data(DH d, int idx); / Deprecated version / # ifndef OPENSSL_NO_DEPRECATED DH DH_generate_parameters(int prime_len, int generator, void (callback) (int, int, void ), void cb_arg); # endif / !defined(OPENSSL_NO_DEPRECATED) / / New version / int DH_generate_parameters_ex(DH dh, int prime_len, int generator, BN_GENCB cb); int DH_check(const DH dh, int codes); int DH_check_pub_key(const DH dh, const BIGNUM pub_key, int codes); int DH_generate_key(DH dh); int DH_compute_key(unsigned char key, const BIGNUM pub_key, DH dh); int DH_compute_key_padded(unsigned char key, const BIGNUM pub_key, DH dh); DH d2i_DHparams(DH a, const unsigned char pp, long length); int i2d_DHparams(const DH a, unsigned char pp); DH d2i_DHxparams(DH a, const unsigned char pp, long length); int i2d_DHxparams(const DH a, unsigned char pp); # ifndef OPENSSL_NO_FP_API int DHparams_print_fp(FILE fp, const DH x); # endif # ifndef OPENSSL_NO_BIO int DHparams_print(BIO bp, const DH x); # else int DHparams_print(char bp, const DH x); # endif / RFC 5114 parameters / DH DH_get_1024_160(void); DH DH_get_2048_224(void); DH DH_get_2048_256(void); # ifndef OPENSSL_NO_CMS /* RFC2631 KDF / int DH_KDF_X9_42(unsigned char out, size_t outlen, const unsigned char Z, size_t Zlen, ASN1_OBJECT key_oid, const unsigned char ukm, size_t ukmlen, const EVP_MD md); # endif # define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL) # define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL) # define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL) # define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL) # define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_RFC5114, gen, NULL) # define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \ EVP_PKEY_CTRL_DH_RFC5114, gen, NULL) # define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL) # define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL) # define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_OID, 0, (void )oid) # define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void )poid) # define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_MD, 0, (void )md) # define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void )pmd) # define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL) # define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void )plen) # define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void )p) # define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void )p) # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1) # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2) # define EVP_PKEY_CTRL_DH_RFC5114 (EVP_PKEY_ALG_CTRL + 3) # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN (EVP_PKEY_ALG_CTRL + 4) # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE (EVP_PKEY_ALG_CTRL + 5) # define EVP_PKEY_CTRL_DH_KDF_TYPE (EVP_PKEY_ALG_CTRL + 6) # define EVP_PKEY_CTRL_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 7) # define EVP_PKEY_CTRL_GET_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 8) # define EVP_PKEY_CTRL_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 9) # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 10) # define EVP_PKEY_CTRL_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 11) # define EVP_PKEY_CTRL_GET_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 12) # define EVP_PKEY_CTRL_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 13) # define EVP_PKEY_CTRL_GET_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 14) / KDF types / # define EVP_PKEY_DH_KDF_NONE 1 # define EVP_PKEY_DH_KDF_X9_42 2 / BEGIN ERROR CODES / / * The following lines are auto generated by the script mkerr.pl. Any changes * made after this point may be overwritten when the script is next run. / void ERR_load_DH_strings(void); / Error codes for the DH functions. / / Function codes. / # define DH_F_COMPUTE_KEY 102 # define DH_F_DHPARAMS_PRINT_FP 101 # define DH_F_DH_BUILTIN_GENPARAMS 106 # define DH_F_DH_CMS_DECRYPT 117 # define DH_F_DH_CMS_SET_PEERKEY 118 # define DH_F_DH_CMS_SET_SHARED_INFO 119 # define DH_F_DH_COMPUTE_KEY 114 # define DH_F_DH_GENERATE_KEY 115 # define DH_F_DH_GENERATE_PARAMETERS_EX 116 # define DH_F_DH_NEW_METHOD 105 # define DH_F_DH_PARAM_DECODE 107 # define DH_F_DH_PRIV_DECODE 110 # define DH_F_DH_PRIV_ENCODE 111 # define DH_F_DH_PUB_DECODE 108 # define DH_F_DH_PUB_ENCODE 109 # define DH_F_DO_DH_PRINT 100 # define DH_F_GENERATE_KEY 103 # define DH_F_GENERATE_PARAMETERS 104 # define DH_F_PKEY_DH_DERIVE 112 # define DH_F_PKEY_DH_KEYGEN 113 / Reason codes. */ # define DH_R_BAD_GENERATOR 101 # define DH_R_BN_DECODE_ERROR 109 # define DH_R_BN_ERROR 106 # define DH_R_DECODE_ERROR 104 # define DH_R_INVALID_PUBKEY 102 # define DH_R_KDF_PARAMETER_ERROR 112 # define DH_R_KEYS_NOT_SET 108 # define DH_R_KEY_SIZE_TOO_SMALL 110 # define DH_R_MODULUS_TOO_LARGE 103 # define DH_R_NON_FIPS_METHOD 111 # define DH_R_NO_PARAMETERS_SET 107 # define DH_R_NO_PRIVATE_VALUE 100 # define DH_R_PARAMETER_ENCODING_ERROR 105 # define DH_R_PEER_KEY_ERROR 113 # define DH_R_SHARED_INFO_ERROR 114 #ifdef __cplusplus } #endif #endif Back

Edit File : dh.h | Size : 16.36 KB

/* crypto/dh/dh.h */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#ifndef HEADER_DH_H
# define HEADER_DH_H

# include <openssl/e_os2.h>

# ifdef OPENSSL_NO_DH
#  error DH is disabled.
# endif

# ifndef OPENSSL_NO_BIO
#  include <openssl/bio.h>
# endif
# include <openssl/ossl_typ.h>
# ifndef OPENSSL_NO_DEPRECATED
#  include <openssl/bn.h>
# endif

# ifndef OPENSSL_DH_MAX_MODULUS_BITS
#  define OPENSSL_DH_MAX_MODULUS_BITS    10000
# endif

# define DH_FLAG_CACHE_MONT_P     0x01

/*
 * new with 0.9.7h; the built-in DH
 * implementation now uses constant time
 * modular exponentiation for secret exponents
 * by default. This flag causes the
 * faster variable sliding window method to
 * be used for all exponents.
 */
# define DH_FLAG_NO_EXP_CONSTTIME 0x02

/*
 * If this flag is set the DH method is FIPS compliant and can be used in
 * FIPS mode. This is set in the validated module method. If an application
 * sets this flag in its own methods it is its reposibility to ensure the
 * result is compliant.
 */

# define DH_FLAG_FIPS_METHOD                     0x0400

/*
 * If this flag is set the operations normally disabled in FIPS mode are
 * permitted it is then the applications responsibility to ensure that the
 * usage is compliant.
 */

# define DH_FLAG_NON_FIPS_ALLOW                  0x0400

#ifdef  __cplusplus
extern "C" {
#endif

/* Already defined in ossl_typ.h */
/* typedef struct dh_st DH; */
/* typedef struct dh_method DH_METHOD; */

struct dh_method {
    const char *name;
    /* Methods here */
    int (*generate_key) (DH *dh);
    int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
    /* Can be null */
    int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
                       const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
                       BN_MONT_CTX *m_ctx);
    int (*init) (DH *dh);
    int (*finish) (DH *dh);
    int flags;
    char *app_data;
    /* If this is non-NULL, it will be used to generate parameters */
    int (*generate_params) (DH *dh, int prime_len, int generator,
                            BN_GENCB *cb);
};

struct dh_st {
    /*
     * This first argument is used to pick up errors when a DH is passed
     * instead of a EVP_PKEY
     */
    int pad;
    int version;
    BIGNUM *p;
    BIGNUM *g;
    long length;                /* optional */
    BIGNUM *pub_key;            /* g^x % p */
    BIGNUM *priv_key;           /* x */
    int flags;
    BN_MONT_CTX *method_mont_p;
    /* Place holders if we want to do X9.42 DH */
    BIGNUM *q;
    BIGNUM *j;
    unsigned char *seed;
    int seedlen;
    BIGNUM *counter;
    int references;
    CRYPTO_EX_DATA ex_data;
    const DH_METHOD *meth;
    ENGINE *engine;
};

# define DH_GENERATOR_2          2
/* #define DH_GENERATOR_3       3 */
# define DH_GENERATOR_5          5

/* DH_check error codes */
# define DH_CHECK_P_NOT_PRIME            0x01
# define DH_CHECK_P_NOT_SAFE_PRIME       0x02
# define DH_UNABLE_TO_CHECK_GENERATOR    0x04
# define DH_NOT_SUITABLE_GENERATOR       0x08
# define DH_CHECK_Q_NOT_PRIME            0x10
# define DH_CHECK_INVALID_Q_VALUE        0x20
# define DH_CHECK_INVALID_J_VALUE        0x40

/* DH_check_pub_key error codes */
# define DH_CHECK_PUBKEY_TOO_SMALL       0x01
# define DH_CHECK_PUBKEY_TOO_LARGE       0x02
# define DH_CHECK_PUBKEY_INVALID         0x04

/*
 * primes p where (p-1)/2 is prime too are called "safe"; we define this for
 * backward compatibility:
 */
# define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME

# define d2i_DHparams_fp(fp,x) \
    (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
                      (char *(*)())d2i_DHparams, \
                      (fp), \
                      (unsigned char **)(x))
# define i2d_DHparams_fp(fp,x) \
    ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char *)(x))
# define d2i_DHparams_bio(bp,x) \
    ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x)
# define i2d_DHparams_bio(bp,x) \
    ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)

# define d2i_DHxparams_fp(fp,x) \
    (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
                      (char *(*)())d2i_DHxparams, \
                      (fp), \
                      (unsigned char **)(x))
# define i2d_DHxparams_fp(fp,x) \
    ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char *)(x))
# define d2i_DHxparams_bio(bp,x) \
    ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x)
# define i2d_DHxparams_bio(bp,x) \
    ASN1_i2d_bio_of_const(DH, i2d_DHxparams, bp, x)

DH *DHparams_dup(DH *);

const DH_METHOD *DH_OpenSSL(void);

void DH_set_default_method(const DH_METHOD *meth);
const DH_METHOD *DH_get_default_method(void);
int DH_set_method(DH *dh, const DH_METHOD *meth);
DH *DH_new_method(ENGINE *engine);

DH *DH_new(void);
void DH_free(DH *dh);
int DH_up_ref(DH *dh);
int DH_size(const DH *dh);
int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
                        CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
int DH_set_ex_data(DH *d, int idx, void *arg);
void *DH_get_ex_data(DH *d, int idx);

/* Deprecated version */
# ifndef OPENSSL_NO_DEPRECATED
DH *DH_generate_parameters(int prime_len, int generator,
                           void (*callback) (int, int, void *), void *cb_arg);
# endif                         /* !defined(OPENSSL_NO_DEPRECATED) */

/* New version */
int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
                              BN_GENCB *cb);

int DH_check(const DH *dh, int *codes);
int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
int DH_generate_key(DH *dh);
int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
int i2d_DHparams(const DH *a, unsigned char **pp);
DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length);
int i2d_DHxparams(const DH *a, unsigned char **pp);
# ifndef OPENSSL_NO_FP_API
int DHparams_print_fp(FILE *fp, const DH *x);
# endif
# ifndef OPENSSL_NO_BIO
int DHparams_print(BIO *bp, const DH *x);
# else
int DHparams_print(char *bp, const DH *x);
# endif

/* RFC 5114 parameters */
DH *DH_get_1024_160(void);
DH *DH_get_2048_224(void);
DH *DH_get_2048_256(void);

# ifndef OPENSSL_NO_CMS
/* RFC2631 KDF */
int DH_KDF_X9_42(unsigned char *out, size_t outlen,
                 const unsigned char *Z, size_t Zlen,
                 ASN1_OBJECT *key_oid,
                 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
# endif

# define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)

# define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)

# define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)

# define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)

# define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)

# define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
                        EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)

# define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)

# define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)

# define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)oid)

# define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)poid)

# define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)md)

# define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)pmd)

# define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)

# define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                        EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)plen)

# define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)p)

# define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)p)

# define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
# define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
# define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
# define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
# define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
# define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
# define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
# define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
# define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
# define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
# define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
# define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
# define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
# define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)

/* KDF types */
# define EVP_PKEY_DH_KDF_NONE                            1
# define EVP_PKEY_DH_KDF_X9_42                           2

/* BEGIN ERROR CODES */
/*
 * The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_DH_strings(void);

/* Error codes for the DH functions. */

/* Function codes. */
# define DH_F_COMPUTE_KEY                                 102
# define DH_F_DHPARAMS_PRINT_FP                           101
# define DH_F_DH_BUILTIN_GENPARAMS                        106
# define DH_F_DH_CMS_DECRYPT                              117
# define DH_F_DH_CMS_SET_PEERKEY                          118
# define DH_F_DH_CMS_SET_SHARED_INFO                      119
# define DH_F_DH_COMPUTE_KEY                              114
# define DH_F_DH_GENERATE_KEY                             115
# define DH_F_DH_GENERATE_PARAMETERS_EX                   116
# define DH_F_DH_NEW_METHOD                               105
# define DH_F_DH_PARAM_DECODE                             107
# define DH_F_DH_PRIV_DECODE                              110
# define DH_F_DH_PRIV_ENCODE                              111
# define DH_F_DH_PUB_DECODE                               108
# define DH_F_DH_PUB_ENCODE                               109
# define DH_F_DO_DH_PRINT                                 100
# define DH_F_GENERATE_KEY                                103
# define DH_F_GENERATE_PARAMETERS                         104
# define DH_F_PKEY_DH_DERIVE                              112
# define DH_F_PKEY_DH_KEYGEN                              113

/* Reason codes. */
# define DH_R_BAD_GENERATOR                               101
# define DH_R_BN_DECODE_ERROR                             109
# define DH_R_BN_ERROR                                    106
# define DH_R_DECODE_ERROR                                104
# define DH_R_INVALID_PUBKEY                              102
# define DH_R_KDF_PARAMETER_ERROR                         112
# define DH_R_KEYS_NOT_SET                                108
# define DH_R_KEY_SIZE_TOO_SMALL                          110
# define DH_R_MODULUS_TOO_LARGE                           103
# define DH_R_NON_FIPS_METHOD                             111
# define DH_R_NO_PARAMETERS_SET                           107
# define DH_R_NO_PRIVATE_VALUE                            100
# define DH_R_PARAMETER_ENCODING_ERROR                    105
# define DH_R_PEER_KEY_ERROR                              113
# define DH_R_SHARED_INFO_ERROR                           114

#ifdef  __cplusplus
}
#endif
#endif

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