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ec_oct.c
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1 /* crypto/ec/ec_lib.c */
2 /*
3  * Originally written by Bodo Moeller for the OpenSSL project.
4  */
5 /* ====================================================================
6  * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
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58 /* ====================================================================
59  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60  * Binary polynomial ECC support in OpenSSL originally developed by
61  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62  */
63 
64 #include <string.h>
65 
66 #include <openssl/err.h>
67 #include <openssl/opensslv.h>
68 
69 #include "ec_lcl.h"
70 
71 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
72  const BIGNUM *x, int y_bit, BN_CTX *ctx)
73  {
74  if (group->meth->point_set_compressed_coordinates == 0
75  && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
76  {
77  ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
78  return 0;
79  }
80  if (group->meth != point->meth)
81  {
82  ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
83  return 0;
84  }
85  if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
86  {
87  if (group->meth->field_type == NID_X9_62_prime_field)
88  return ec_GFp_simple_set_compressed_coordinates(
89  group, point, x, y_bit, ctx);
90  else
91 #ifdef OPENSSL_NO_EC2M
92  {
93  ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_GF2M_NOT_SUPPORTED);
94  return 0;
95  }
96 #else
97  return ec_GF2m_simple_set_compressed_coordinates(
98  group, point, x, y_bit, ctx);
99 #endif
100  }
101  return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
102  }
103 
104 #ifndef OPENSSL_NO_EC2M
105 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
106  const BIGNUM *x, int y_bit, BN_CTX *ctx)
107  {
108  if (group->meth->point_set_compressed_coordinates == 0
109  && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
110  {
111  ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
112  return 0;
113  }
114  if (group->meth != point->meth)
115  {
116  ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
117  return 0;
118  }
119  if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
120  {
121  if (group->meth->field_type == NID_X9_62_prime_field)
122  return ec_GFp_simple_set_compressed_coordinates(
123  group, point, x, y_bit, ctx);
124  else
125  return ec_GF2m_simple_set_compressed_coordinates(
126  group, point, x, y_bit, ctx);
127  }
128  return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
129  }
130 #endif
131 
132 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
133  unsigned char *buf, size_t len, BN_CTX *ctx)
134  {
135  if (group->meth->point2oct == 0
136  && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
137  {
138  ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
139  return 0;
140  }
141  if (group->meth != point->meth)
142  {
143  ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
144  return 0;
145  }
146  if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
147  {
148  if (group->meth->field_type == NID_X9_62_prime_field)
149  return ec_GFp_simple_point2oct(group, point,
150  form, buf, len, ctx);
151  else
152 #ifdef OPENSSL_NO_EC2M
153  {
154  ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
155  return 0;
156  }
157 #else
158  return ec_GF2m_simple_point2oct(group, point,
159  form, buf, len, ctx);
160 #endif
161  }
162 
163  return group->meth->point2oct(group, point, form, buf, len, ctx);
164  }
165 
166 
167 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
168  const unsigned char *buf, size_t len, BN_CTX *ctx)
169  {
170  if (group->meth->oct2point == 0
171  && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT))
172  {
173  ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
174  return 0;
175  }
176  if (group->meth != point->meth)
177  {
178  ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
179  return 0;
180  }
181  if(group->meth->flags & EC_FLAGS_DEFAULT_OCT)
182  {
183  if (group->meth->field_type == NID_X9_62_prime_field)
184  return ec_GFp_simple_oct2point(group, point,
185  buf, len, ctx);
186  else
187 #ifdef OPENSSL_NO_EC2M
188  {
189  ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
190  return 0;
191  }
192 #else
193  return ec_GF2m_simple_oct2point(group, point,
194  buf, len, ctx);
195 #endif
196  }
197  return group->meth->oct2point(group, point, buf, len, ctx);
198  }
199 
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