| /* 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 OPENSSL_HEADER_DH_H |
| #define OPENSSL_HEADER_DH_H |
| |
| #include <openssl/base.h> |
| |
| #include <openssl/engine.h> |
| #include <openssl/ex_data.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| /* DH contains functions for performing Diffie-Hellman key agreement in |
| * multiplicative groups. */ |
| |
| |
| /* Allocation and destruction. */ |
| |
| /* DH_new returns a new, empty DH object or NULL on error. */ |
| OPENSSL_EXPORT DH *DH_new(void); |
| |
| /* DH_new_method acts the same as |DH_new| but takes an explicit |ENGINE|. */ |
| OPENSSL_EXPORT DH *DH_new_method(const ENGINE *engine); |
| |
| /* DH_free decrements the reference count of |dh| and frees it if the reference |
| * count drops to zero. */ |
| OPENSSL_EXPORT void DH_free(DH *dh); |
| |
| /* DH_up_ref increments the reference count of |dh|. */ |
| OPENSSL_EXPORT int DH_up_ref(DH *dh); |
| |
| |
| /* Standard parameters. |
| * |
| * These functions return new DH objects with standard parameters configured |
| * that use the given ENGINE, which may be NULL. They return NULL on allocation |
| * failure. */ |
| |
| /* These parameters are taken from RFC 5114. */ |
| |
| OPENSSL_EXPORT DH *DH_get_1024_160(const ENGINE *engine); |
| OPENSSL_EXPORT DH *DH_get_2048_224(const ENGINE *engine); |
| OPENSSL_EXPORT DH *DH_get_2048_256(const ENGINE *engine); |
| |
| |
| /* Parameter generation. */ |
| |
| #define DH_GENERATOR_2 2 |
| #define DH_GENERATOR_5 5 |
| |
| /* DH_generate_parameters_ex generates a suitable Diffie-Hellman group with a |
| * prime that is |prime_bits| long and stores it in |dh|. The generator of the |
| * group will be |generator|, which should be |DH_GENERATOR_2| unless there's a |
| * good reason to use a different value. The |cb| argument contains a callback |
| * function that will be called during the generation. See the documentation in |
| * |bn.h| about this. In addition to the callback invocations from |BN|, |cb| |
| * will also be called with |event| equal to three when the generation is |
| * complete. */ |
| OPENSSL_EXPORT int DH_generate_parameters_ex(DH *dh, int prime_bits, |
| int generator, BN_GENCB *cb); |
| |
| |
| /* Diffie-Hellman operations. */ |
| |
| /* DH_generate_key generates a new, random, private key and stores it in |
| * |dh|. It returns one on success and zero on error. */ |
| OPENSSL_EXPORT int DH_generate_key(DH *dh); |
| |
| /* DH_compute_key calculates the shared key between |dh| and |peers_key| and |
| * writes it as a big-endian integer into |out|, which must have |DH_size| |
| * bytes of space. It returns the number of bytes written, or a negative number |
| * on error. */ |
| OPENSSL_EXPORT ssize_t |
| DH_compute_key(uint8_t *out, const BIGNUM *peers_key, DH *dh); |
| |
| |
| /* Utility functions. */ |
| |
| /* DH_size returns the number of bytes in the DH group's prime. */ |
| OPENSSL_EXPORT int DH_size(const DH *dh); |
| |
| #define DH_CHECK_P_NOT_PRIME 0x01 |
| #define DH_CHECK_P_NOT_SAFE_PRIME 0x02 |
| #define DH_CHECK_UNABLE_TO_CHECK_GENERATOR 0x04 |
| #define DH_CHECK_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 checks the suitability of |dh| as a Diffie-Hellman group. and sets |
| * |DH_CHECK_*| flags in |*out_flags| if it finds any errors. It returns one if |
| * |*out_flags| was successfully set and zero on error. |
| * |
| * Note: these checks may be quite computationally expensive. */ |
| OPENSSL_EXPORT int DH_check(const DH *dh, int *out_flags); |
| |
| #define DH_CHECK_PUBKEY_TOO_SMALL 1 |
| #define DH_CHECK_PUBKEY_TOO_LARGE 2 |
| |
| /* DH_check_pub_key checks the suitability of |pub_key| as a public key for the |
| * DH group in |dh| and sets |DH_CHECK_PUBKEY_*| flags in |*out_flags| if it |
| * finds any errors. It returns one if |*out_flags| was successfully set and |
| * zero on error. */ |
| OPENSSL_EXPORT int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, |
| int *out_flags); |
| |
| /* DHparams_dup allocates a fresh |DH| and copies the parameters from |dh| into |
| * it. It returns the new |DH| or NULL on error. */ |
| OPENSSL_EXPORT DH *DHparams_dup(const DH *dh); |
| |
| |
| /* ASN.1 functions. */ |
| |
| /* d2i_DHparams parses an ASN.1, DER encoded Diffie-Hellman parameters |
| * structure from |len| bytes at |*inp|. If |ret| is not NULL then, on exit, a |
| * pointer to the result is in |*ret|. If |*ret| is already non-NULL on entry |
| * then the result is written directly into |*ret|, otherwise a fresh |DH| is |
| * allocated. On successful exit, |*inp| is advanced past the DER structure. It |
| * returns the result or NULL on error. */ |
| OPENSSL_EXPORT DH *d2i_DHparams(DH **ret, const unsigned char **inp, long len); |
| |
| /* i2d_DHparams marshals |in| to an ASN.1, DER structure. If |outp| is not NULL |
| * then the result is written to |*outp| and |*outp| is advanced just past the |
| * output. It returns the number of bytes in the result, whether written or |
| * not, or a negative value on error. */ |
| OPENSSL_EXPORT int i2d_DHparams(const DH *in, unsigned char **outp); |
| |
| |
| /* ex_data functions. |
| * |
| * These functions are wrappers. See |ex_data.h| for details. */ |
| |
| OPENSSL_EXPORT 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); |
| OPENSSL_EXPORT int DH_set_ex_data(DH *d, int idx, void *arg); |
| OPENSSL_EXPORT void *DH_get_ex_data(DH *d, int idx); |
| |
| |
| /* dh_method contains function pointers to override the implementation of DH. |
| * See |engine.h| for details. */ |
| struct dh_method { |
| struct openssl_method_common_st common; |
| |
| /* app_data is an opaque pointer for the method to use. */ |
| void *app_data; |
| |
| /* init is called just before the return of |DH_new_method|. It returns one |
| * on success or zero on error. */ |
| int (*init)(DH *dh); |
| |
| /* finish is called before |dh| is destructed. */ |
| void (*finish)(DH *dh); |
| |
| /* generate_parameters is called by |DH_generate_parameters_ex|. */ |
| int (*generate_parameters)(DH *dh, int prime_bits, int generator, |
| BN_GENCB *cb); |
| |
| /* generate_parameters is called by |DH_generate_key|. */ |
| int (*generate_key)(DH *dh); |
| |
| /* generate_parameters is called by |DH_compute_key|. */ |
| ssize_t (*compute_key)(DH *dh, uint8_t *out, const BIGNUM *pub_key); |
| }; |
| |
| struct dh_st { |
| DH_METHOD *meth; |
| |
| BIGNUM *p; |
| BIGNUM *g; |
| BIGNUM *pub_key; /* g^x */ |
| BIGNUM *priv_key; /* x */ |
| |
| /* priv_length contains the length, in bits, of the private value. If zero, |
| * the private value will be the same length as |p|. */ |
| unsigned priv_length; |
| 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 flags; |
| int references; |
| CRYPTO_EX_DATA ex_data; |
| }; |
| |
| |
| #if defined(__cplusplus) |
| } /* extern C */ |
| #endif |
| |
| #define DH_F_generate_parameters 100 |
| #define DH_F_generate_key 101 |
| #define DH_F_compute_key 102 |
| #define DH_F_DH_new_method 103 |
| #define DH_R_INVALID_PUBKEY 100 |
| #define DH_R_BAD_GENERATOR 101 |
| #define DH_R_MODULUS_TOO_LARGE 102 |
| #define DH_R_NO_PRIVATE_VALUE 103 |
| |
| #endif /* OPENSSL_HEADER_DH_H */ |