-/* TODO */
/* crypto/ec/ec_lcl.h */
/* ====================================================================
* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
* 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_curve_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_curve_GFp)(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
void (*group_finish)(EC_GROUP *);
+ void (*group_clear_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' and 'get' 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 *);
+ void (*point_clear_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 *, const 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: */
- 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);
+ 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 *);
+
+ /* used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_make_affine */
+ int (*is_at_infinity)(const EC_GROUP *, const EC_POINT *);
+ int (*is_on_curve)(const EC_GROUP *, const EC_POINT *, BN_CTX *);
+ int (*make_affine)(const EC_GROUP *, const EC_POINT *, BN_CTX *);
/* internal functions */
/* '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
- * implementations of field operations: */
- int (*field_mult)(const EC_GROUP *, BIGNUM *r, BIGNUM *a, BIGNUM *b);
- int (*field_sqr)(const EC_GROUP *, BIGNUM *r, BIGNUM *a);
+ * optimized implementations of expensive field operations: */
+ 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 */;
struct ec_group_st {
- EC_METHOD *meth;
+ const EC_METHOD *meth;
+
+ void *extra_data;
+ void *(*extra_data_dup_func)(void *);
+ void (*extra_data_free_func)(void *);
+ void (*extra_data_clear_free_func)(void *);
+ /* All members except 'meth' and 'extra_data...' are handled by
+ * the method functions, even if they appear generic */
+
BIGNUM field; /* Field specification.
* For curves over GF(p), this is the modulus. */
void *field_data; /* method-specific (e.g., Montgomery structure) */
BIGNUM a, b; /* Curve coefficients.
* (Here the assumption is that BIGNUMs can be used
- * or abused for all kinds of fields, not just GF(p).) */
+ * or abused for all kinds of fields, not just GF(p).)
+ * For characteristic > 3, the curve is defined
+ * by a Weierstrass equation of the form
+ * Y^2 = X^3 + a*X + b.
+ */
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;
} /* EC_GROUP */;
+/* Basically a 'mixin' for extra data, but available for EC_GROUPs only
+ * (with visibility limited to 'package' level for now).
+ * We use the function pointers as index for retrieval; this obviates
+ * global ex_data-style index tables.
+ * (Currently, we have one slot only, but is is possible to extend this
+ * if necessary.) */
+int EC_GROUP_set_extra_data(EC_GROUP *, void *extra_data, void *(*extra_data_dup_func)(void *),
+ void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *));
+void *EC_GROUP_get_extra_data(EC_GROUP *, void *(*extra_data_dup_func)(void *),
+ void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *));
+void EC_GROUP_free_extra_data(EC_GROUP *);
+void EC_GROUP_clear_free_extra_data(EC_GROUP *);
+
+
+
struct ec_point_st {
- EC_METHOD *meth;
+ const EC_METHOD *meth;
+
+ /* All members except 'meth' are handled by the method functions,
+ * even if they appear generic */
- BIGNUM x;
- BIGNUM y;
- BIGNUM z; /* Jacobian projective coordinates */
- int z_is_one; /* enable optimized point arithmetics for special case */
+ BIGNUM X;
+ BIGNUM Y;
+ BIGNUM Z; /* Jacobian projective coordinates:
+ * (X, Y, Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
+ int Z_is_one; /* enable optimized point arithmetics for special case */
} /* EC_POINT */;
+
+
+
+/* method functions in ecp_smpl.c */
+int ec_GFp_simple_group_init(EC_GROUP *);
+int ec_GFp_simple_group_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+void ec_GFp_simple_group_finish(EC_GROUP *);
+void ec_GFp_simple_group_clear_finish(EC_GROUP *);
+int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
+int ec_GFp_simple_group_set_generator(EC_GROUP *, const EC_POINT *generator,
+ const BIGNUM *order, const BIGNUM *cofactor);
+/* TODO: 'set' and 'get' functions for EC_GROUPs */
+int ec_GFp_simple_point_init(EC_POINT *);
+void ec_GFp_simple_point_finish(EC_POINT *);
+void ec_GFp_simple_point_clear_finish(EC_POINT *);
+int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
+/* TODO: 'set' and 'get' functions for EC_POINTs */
+size_t ec_GFp_simple_point2oct(const EC_GROUP *, const EC_POINT *, point_conversion_form_t form,
+ unsigned char *buf, size_t len, BN_CTX *);
+int ec_GFp_simple_oct2point(const EC_GROUP *, EC_POINT *,
+ const unsigned char *buf, size_t len, BN_CTX *);
+int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *);
+int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
+int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
+int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
+int ec_GFp_simple_make_affine(const EC_GROUP *, const EC_POINT *, BN_CTX *);
+int ec_GFp_simple_field_mult(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+
+
+/* method functions in ecp_mont.c */
+int ec_GFp_mont_group_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+void ec_GFp_mont_group_finish(EC_GROUP *);
+void ec_GFp_mont_group_clear_finish(EC_GROUP *);
+int ec_GFp_mont_field_mult(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+
+
+/* method functions in ecp_recp.c */
+int ec_GFp_recp_group_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+void ec_GFp_recp_group_finish(EC_GROUP *);
+void ec_GFp_recp_group_clear_finish(EC_GROUP *);
+int ec_GFp_recp_field_mult(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+int ec_GFp_recp_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_recp_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_recp_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+
+
+/* method functions in ecp_nist.c */
+int ec_GFp_nist_group_set_curve_GFp(EC_GROUP *, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+void ec_GFp_nist_group_finish(EC_GROUP *);
+void ec_GFp_nist_group_clear_finish(EC_GROUP *);
+int ec_GFp_nist_field_mult(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *);
+int ec_GFp_nist_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_nist_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
+int ec_GFp_nist_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
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