crypto/openssl-0.9.7e/crypto/ec/ec.h

   1 /* crypto/ec/ec.h */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 #ifndef HEADER_EC_H
  57 #define HEADER_EC_H
  58
  59 #ifdef OPENSSL_NO_EC
  60 #error EC is disabled.
  61 #endif
  62
  63 #include <openssl/bn.h>
  64 #include <openssl/symhacks.h>
  65
  66 #ifdef  __cplusplus
  67 extern "C" {
  68 #endif
  69
  70
  71 typedef enum {
  72         /* values as defined in X9.62 (ECDSA) and elsewhere */
  73         POINT_CONVERSION_COMPRESSED = 2,
  74         POINT_CONVERSION_UNCOMPRESSED = 4,
  75         POINT_CONVERSION_HYBRID = 6
  76 } point_conversion_form_t;
  77
  78
  79 typedef struct ec_method_st EC_METHOD;
  80
  81 typedef struct ec_group_st
  82         /*
  83          EC_METHOD *meth;
  84          -- field definition
  85          -- curve coefficients
  86          -- optional generator with associated information (order, cofactor)
  87          -- optional extra data (TODO: precomputed table for fast computation of multiples of generator)
  88         */
  89         EC_GROUP;
  90
  91 typedef struct ec_point_st EC_POINT;
  92
  93
  94 /* EC_METHODs for curves over GF(p).
  95  * EC_GFp_simple_method provides the basis for the optimized methods.
  96  */
  97 const EC_METHOD *EC_GFp_simple_method(void);
  98 const EC_METHOD *EC_GFp_mont_method(void);
  99 #if 0
 100 const EC_METHOD *EC_GFp_recp_method(void); /* TODO */
 101 const EC_METHOD *EC_GFp_nist_method(void); /* TODO */
 102 #endif
 103
 104
 105 EC_GROUP *EC_GROUP_new(const EC_METHOD *);
 106 void EC_GROUP_free(EC_GROUP *);
 107 void EC_GROUP_clear_free(EC_GROUP *);
 108 int EC_GROUP_copy(EC_GROUP *, const EC_GROUP *);
 109
 110 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *);
 111
 112
 113 /* We don't have types for field specifications and field elements in general.
 114  * Otherwise we could declare
 115  *     int EC_GROUP_set_curve(EC_GROUP *, .....);
 116  */
 117 int EC_GROUP_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
 118 int EC_GROUP_get_curve_GFp(const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *);
 119
 120 /* EC_GROUP_new_GFp() calls EC_GROUP_new() and EC_GROUP_set_GFp()
 121  * after choosing an appropriate EC_METHOD */
 122 EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
 123
 124 int EC_GROUP_set_generator(EC_GROUP *, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor);
 125 EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *);
 126 int EC_GROUP_get_order(const EC_GROUP *, BIGNUM *order, BN_CTX *);
 127 int EC_GROUP_get_cofactor(const EC_GROUP *, BIGNUM *cofactor, BN_CTX *);
 128
 129 EC_POINT *EC_POINT_new(const EC_GROUP *);
 130 void EC_POINT_free(EC_POINT *);
 131 void EC_POINT_clear_free(EC_POINT *);
 132 int EC_POINT_copy(EC_POINT *, const EC_POINT *);
 133
 134 const EC_METHOD *EC_POINT_method_of(const EC_POINT *);
 135
 136 int EC_POINT_set_to_infinity(const EC_GROUP *, EC_POINT *);
 137 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *, EC_POINT *,
 138         const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *);
 139 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *, const EC_POINT *,
 140         BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *);
 141 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *, EC_POINT *,
 142         const BIGNUM *x, const BIGNUM *y, BN_CTX *);
 143 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *, const EC_POINT *,
 144         BIGNUM *x, BIGNUM *y, BN_CTX *);
 145 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *, EC_POINT *,
 146         const BIGNUM *x, int y_bit, BN_CTX *);
 147
 148 size_t EC_POINT_point2oct(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
 149         unsigned char *buf, size_t len, BN_CTX *);
 150 int EC_POINT_oct2point(const EC_GROUP *, EC_POINT *,
 151         const unsigned char *buf, size_t len, BN_CTX *);
 152
 153 int EC_POINT_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
 154 int EC_POINT_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
 155 int EC_POINT_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
 156
 157 int EC_POINT_is_at_infinity(const EC_GROUP *, const EC_POINT *);
 158 int EC_POINT_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
 159 int EC_POINT_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
 160
 161 int EC_POINT_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
 162 int EC_POINTs_make_affine(const EC_GROUP *, size_t num, EC_POINT *[], BN_CTX *);
 163
 164
 165 int EC_POINTs_mul(const EC_GROUP *, EC_POINT *r, const BIGNUM *, size_t num, const EC_POINT *[], const BIGNUM *[], BN_CTX *);
 166 int EC_POINT_mul(const EC_GROUP *, EC_POINT *r, const BIGNUM *, const EC_POINT *, const BIGNUM *, BN_CTX *);
 167 int EC_GROUP_precompute_mult(EC_GROUP *, BN_CTX *);
 168
 169
 170
 171 /* BEGIN ERROR CODES */
 172 /* The following lines are auto generated by the script mkerr.pl. Any changes
 173  * made after this point may be overwritten when the script is next run.
 174  */
 175 void ERR_load_EC_strings(void);
 176
 177 /* Error codes for the EC functions. */
 178
 179 /* Function codes. */
 180 #define EC_F_COMPUTE_WNAF                                143
 181 #define EC_F_EC_GFP_MONT_FIELD_DECODE                    133
 182 #define EC_F_EC_GFP_MONT_FIELD_ENCODE                    134
 183 #define EC_F_EC_GFP_MONT_FIELD_MUL                       131
 184 #define EC_F_EC_GFP_MONT_FIELD_SQR                       132
 185 #define EC_F_EC_GFP_SIMPLE_GROUP_SET_CURVE_GFP           100
 186 #define EC_F_EC_GFP_SIMPLE_GROUP_SET_GENERATOR           101
 187 #define EC_F_EC_GFP_SIMPLE_MAKE_AFFINE                   102
 188 #define EC_F_EC_GFP_SIMPLE_OCT2POINT                     103
 189 #define EC_F_EC_GFP_SIMPLE_POINT2OCT                     104
 190 #define EC_F_EC_GFP_SIMPLE_POINTS_MAKE_AFFINE            137
 191 #define EC_F_EC_GFP_SIMPLE_POINT_GET_AFFINE_COORDINATES_GFP 105
 192 #define EC_F_EC_GFP_SIMPLE_POINT_SET_AFFINE_COORDINATES_GFP 128
 193 #define EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES_GFP 129
 194 #define EC_F_EC_GROUP_COPY                               106
 195 #define EC_F_EC_GROUP_GET0_GENERATOR                     139
 196 #define EC_F_EC_GROUP_GET_COFACTOR                       140
 197 #define EC_F_EC_GROUP_GET_CURVE_GFP                      130
 198 #define EC_F_EC_GROUP_GET_ORDER                          141
 199 #define EC_F_EC_GROUP_NEW                                108
 200 #define EC_F_EC_GROUP_PRECOMPUTE_MULT                    142
 201 #define EC_F_EC_GROUP_SET_CURVE_GFP                      109
 202 #define EC_F_EC_GROUP_SET_EXTRA_DATA                     110
 203 #define EC_F_EC_GROUP_SET_GENERATOR                      111
 204 #define EC_F_EC_POINTS_MAKE_AFFINE                       136
 205 #define EC_F_EC_POINTS_MUL                               138
 206 #define EC_F_EC_POINT_ADD                                112
 207 #define EC_F_EC_POINT_CMP                                113
 208 #define EC_F_EC_POINT_COPY                               114
 209 #define EC_F_EC_POINT_DBL                                115
 210 #define EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP         116
 211 #define EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP    117
 212 #define EC_F_EC_POINT_IS_AT_INFINITY                     118
 213 #define EC_F_EC_POINT_IS_ON_CURVE                        119
 214 #define EC_F_EC_POINT_MAKE_AFFINE                        120
 215 #define EC_F_EC_POINT_NEW                                121
 216 #define EC_F_EC_POINT_OCT2POINT                          122
 217 #define EC_F_EC_POINT_POINT2OCT                          123
 218 #define EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP         124
 219 #define EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP     125
 220 #define EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP    126
 221 #define EC_F_EC_POINT_SET_TO_INFINITY                    127
 222 #define EC_F_GFP_MONT_GROUP_SET_CURVE_GFP                135
 223
 224 /* Reason codes. */
 225 #define EC_R_BUFFER_TOO_SMALL                            100
 226 #define EC_R_INCOMPATIBLE_OBJECTS                        101
 227 #define EC_R_INVALID_ARGUMENT                            112
 228 #define EC_R_INVALID_COMPRESSED_POINT                    110
 229 #define EC_R_INVALID_COMPRESSION_BIT                     109
 230 #define EC_R_INVALID_ENCODING                            102
 231 #define EC_R_INVALID_FIELD                               103
 232 #define EC_R_INVALID_FORM                                104
 233 #define EC_R_NOT_INITIALIZED                             111
 234 #define EC_R_POINT_AT_INFINITY                           106
 235 #define EC_R_POINT_IS_NOT_ON_CURVE                       107
 236 #define EC_R_SLOT_FULL                                   108
 237 #define EC_R_UNDEFINED_GENERATOR                         113
 238 #define EC_R_UNKNOWN_ORDER                               114
 239
 240 #ifdef  __cplusplus
 241 }
 242 #endif
 243 #endif