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Add BN_CTX arguments where appropriate.

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Rename 'EC_GROUP_set'-related functions to names similar to 'EC_GROUP_set_curve'
because they don't care about the generator.

Add new functions.
This commit is contained in:
Bodo Möller 2001-03-06 06:20:20 +00:00
parent 45abac85a9
commit 7d7db13e67
2 changed files with 49 additions and 21 deletions
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27
crypto/ec/ec.h
View file

@ -64,6 +64,7 @@ extern "C" {
#endif
typedef enum {
POINT_CONVERSION_COMPRESSED = 2,
POINT_CONVERSION_UNCOMPRESSED = 4,
@ -99,25 +100,35 @@ const EC_METHOD *EC_GFp_nist_method(void);
EC_GROUP *EC_GROUP_new(const EC_METHOD *);
/* We don't have types for field specifications and field elements in general.
* Otherwise we would declare
* int EC_GROUP_set(EC_GROUP *, .....);
* int EC_GROUP_set_curve(EC_GROUP *, .....);
*/
int EC_GROUP_set_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b);
int EC_GROUP_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
void EC_GROUP_free(EC_GROUP *);
int EC_GROUP_copy(EC_GROUP *, const EC_GROUP*);
/* EC_GROUP_new_GFp() calls EC_GROUP_new() and EC_GROUP_set_GFp()
* after choosing an appropriate EC_METHOD */
EC_GROUP *EC_GROUP_new_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b);
EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int EC_GROUP_set_generator(EC_GROUP *, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor);
/* TODO: 'get' functions for EC_GROUPs */
EC_POINT *EC_POINT_new(const EC_GROUP *);
void EC_POINT_free(EC_POINT *);
int EC_POINT_copy(EC_POINT *, const EC_POINT *);
int EC_POINT_add(const EC_GROUP *, EC_POINT *r, EC_POINT *a, EC_POINT *b);
int EC_POINT_dbl(const EC_GROUP *, EC_POINT *r, EC_POINT *a);
/* TODO: 'set' and 'get' functions for EC_POINTs */
size_t EC_POINT_point2oct(const EC_GROUP *, EC_POINT *, point_conversion_form_t form,
unsigned char *buf, size_t len, BN_CTX *);
int EC_POINT_oct2point(const EC_GROUP *, EC_POINT *,
const unsigned char *buf, size_t len, BN_CTX *);
int EC_POINT_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int EC_POINT_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
size_t EC_POINT_point2oct(const EC_GROUP *, EC_POINT *, unsigned char *buf,
size_t len, point_conversion_form_t form);
int EC_POINT_oct2point(const EC_GROUP *, EC_POINT *, unsigned char *buf, size_t len);
/* TODO: scalar multiplication */

43
crypto/ec/ec_lcl.h
View file

@ -64,24 +64,36 @@
* so all this may change in future versions. */
struct ec_method_st {
/* used by EC_GROUP_new, EC_GROUP_set_GFp, EC_GROUP_free: */
/* used by EC_GROUP_new, EC_GROUP_set_GFp, EC_GROUP_free, EC_GROUP_copy: */
int (*group_init)(EC_GROUP *);
/* int (*group_set)(EC_GROUP *, .....); */
int (*group_set_GFp)(EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b);
int (*group_set_GFp)(EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *);
void (*group_finish)(EC_GROUP *);
int (*group_copy)(EC_GROUP *, const EC_GROUP *);
/* used by EC_POINT_new, EC_POINT_free: */
/* used by EC_GROUP_set_generator: */
int (*group_set_generator)(EC_GROUP *, const EC_POINT *generator,
const BIGNUM *order, const BIGNUM *cofactor);
/* TODO: 'set' functions for EC_GROUPs */
/* used by EC_POINT_new, EC_POINT_free, EC_POINT_copy: */
int (*point_init)(EC_POINT *);
void (*point_finish)(EC_POINT *);
int (*point_copy)(EC_POINT *, const EC_POINT *);
/* used by EC_POINT_add, EC_POINT_dbl: */
int (*add)(const EC_GROUP *, EC_POINT *r, EC_POINT *a, EC_POINT *b);
int (*dbl)(const EC_GROUP *, EC_POINT *r, EC_POINT *a);
/* TODO: 'set' and 'get' functions for EC_POINTs */
/* used by EC_POINT_point2oct, EC_POINT_oct2point: */
size_t (*point2oct)(const EC_GROUP *, EC_POINT *, unsigned char *buf,
size_t len, point_conversion_form_t form);
int (*oct2point)(const EC_GROUP *, EC_POINT *, unsigned char *buf, size_t len);
size_t (*point2oct)(const EC_GROUP *, EC_POINT *, point_conversion_form_t form,
unsigned char *buf, size_t len, BN_CTX *);
int (*oct2point)(const EC_GROUP *, EC_POINT *,
const unsigned char *buf, size_t len, BN_CTX *);
/* used by EC_POINT_add, EC_POINT_dbl: */
int (*add)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
int (*dbl)(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
/* internal functions */
@ -89,8 +101,11 @@ struct ec_method_st {
/* 'field_mult' and 'field_sqr' can be used by 'add' and 'dbl' so that
* the same implementations of point operations can be used with different
* optimized implementations of expensive field operations: */
int (*field_mult)(const EC_GROUP *, BIGNUM *r, BIGNUM *a, BIGNUM *b);
int (*field_sqr)(const EC_GROUP *, BIGNUM *r, BIGNUM *a);
int (*field_mult)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
int (*field_sqr)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
int (*field_encode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. to Montgomery */
int (*field_decode)(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *); /* e.g. from Montgomery */
} /* EC_METHOD */;
@ -106,8 +121,10 @@ struct ec_group_st {
* or abused for all kinds of fields, not just GF(p).) */
int a_is_minus3; /* enable optimized point arithmetics for special case */
/* TODO: optional generator with associated information (order, cofactor) */
/* optional Lim/Lee precomputation table */
EC_POINT *generator; /* optional */
BIGNUM order, cofactor;
/* optional Lim/Lee precomputation table */
} /* EC_GROUP */;