=head1 NAME
-ecdsa - Elliptic Curve Digital Signature Algorithm
+ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG, ECDSA_size, ECDSA_sign_setup, ECDSA_sign, ECDSA_sign_ex, ECDSA_verify, ECDSA_do_sign, ECDSA_do_sign_ex, ECDSA_do_verify - Elliptic Curve Digital Signature Algorithm
=head1 SYNOPSIS
ECDSA_SIG* d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp,
long len);
- ECDSA_DATA* ECDSA_DATA_new(void);
- ECDSA_DATA* ECDSA_DATA_new_method(ENGINE *eng);
- void ECDSA_DATA_free(ECDSA_DATA *data);
- ECDSA_DATA* ecdsa_check(EC_KEY *eckey);
-
ECDSA_SIG* ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
EC_KEY *eckey);
+ ECDSA_SIG* ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
+ const BIGNUM *kinv, const BIGNUM *rp,
+ EC_KEY *eckey);
int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
const ECDSA_SIG *sig, EC_KEY* eckey);
int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx,
int ECDSA_sign(int type, const unsigned char *dgst,
int dgstlen, unsigned char *sig,
unsigned int *siglen, EC_KEY *eckey);
+ int ECDSA_sign_ex(int type, const unsigned char *dgst,
+ int dgstlen, unsigned char *sig,
+ unsigned int *siglen, const BIGNUM *kinv,
+ const BIGNUM *rp, EC_KEY *eckey);
int ECDSA_verify(int type, const unsigned char *dgst,
int dgstlen, const unsigned char *sig,
int siglen, EC_KEY *eckey);
B<*sig> points to the buffer containing the DER encoded signature
of size B<len>.
-The B<ECDSA_DATA> structure extends the B<EC_KEY_METH_DATA>
-structure with ECDSA specific data.
-
- struct
- {
- /* EC_KEY_METH_DATA part */
- int (*init)(EC_KEY *);
- void (*finish)(EC_KEY *);
- /* method (ECDSA) specific part */
- BIGNUM *kinv; /* signing pre-calc */
- BIGNUM *r; /* signing pre-calc */
- ...
- }
- ECDSA_DATA;
-
-B<kinv> and B<r> are used to store precomputed values (see
-B<ECDSA_sign_setup>).
-
-ECDSA_DATA_new() returns a newly allocated and initialized
-B<ECDSA_DATA> structure (or NULL on error).
-
-ECDSA_DATA_free() frees the B<ECDSA_DATA> structure B<data>.
-
-ecdsa_check() returns the pointer to the B<ECDSA_DATA>
-structure in B<EC_KEY-E<gt>meth_data> (if B<EC_KEY-E<gt>meth_data>
-is not a pointer to a B<ECDSA_DATA> structure then the old
-data is freed and a new B<ECDSA_DATA> structure is allocated
-using B<ECDSA_DATA_new>).
-
ECDSA_size() returns the maximum length of a DER encoded
ECDSA signature created with the private EC key B<eckey>.
signing operation. B<eckey> is the private EC key and B<ctx>
is a pointer to B<BN_CTX> structure (or NULL). The precomputed
values or returned in B<kinv> and B<rp> and can be used in a
-later call to B<ECDSA_sign> or B<ECDSA_do_sign> when placed in
-B<ECDSA_DATA-E<gt>kinv> and B<ECDSA_DATA-E<gt>r>.
+later call to B<ECDSA_sign_ex> or B<ECDSA_do_sign_ex>.
+
+ECDSA_sign() is wrapper function for ECDSA_sign_ex with B<kinv>
+and B<rp> set to NULL.
-ECDSA_sign() computes a digital signature of the B<dgstlen> bytes
-hash value B<dgst> using the private EC key B<eckey> and places
-the DER encoding of the created signature in B<sig>. The length
-of the created signature is returned in B<sig_len>. Note: B<sig>
+ECDSA_sign_ex() computes a digital signature of the B<dgstlen> bytes
+hash value B<dgst> using the private EC key B<eckey> and the optional
+pre-computed values B<kinv> and B<rp>. The DER encoded signatures is
+stored in B<sig> and it's length is returned in B<sig_len>. Note: B<sig>
must point to B<ECDSA_size> bytes of memory. The parameter B<type>
is ignored.
ECDSA_verify() verifies that the signature in B<sig> of size
B<siglen> is a valid ECDSA signature of the hash value
-value B<dgst> of size B<dgstlen> using the public key B<eckey>.
+B<dgst> of size B<dgstlen> using the public key B<eckey>.
The parameter B<type> is ignored.
-ECDSA_do_sign() computes a digital signature of the B<dgst_len>
-bytes hash value B<dgst> using the private key B<eckey> and
-returns the signature in a newly allocated B<ECDSA_SIG> structure
-(or NULL on error).
+ECDSA_do_sign() is wrapper function for ECDSA_do_sign_ex with B<kinv>
+and B<rp> set to NULL.
+
+ECDSA_do_sign_ex() computes a digital signature of the B<dgst_len>
+bytes hash value B<dgst> using the private key B<eckey> and the
+optional pre-computed values B<kinv> and B<rp>. The signature is
+returned in a newly allocated B<ECDSA_SIG> structure (or NULL on error).
ECDSA_do_verify() verifies that the signature B<sig> is a valid
ECDSA signature of the hash value B<dgst> of size B<dgst_len>
ECDSA_size() returns the maximum length signature or 0 on error.
-ECDSA_sign_setup() and ECDSA_sign() return 1 if successful or -1
+ECDSA_sign_setup() and ECDSA_sign() return 1 if successful or 0
on error.
ECDSA_verify() and ECDSA_do_verify() return 1 for a valid
int ret;
ECDSA_SIG *sig;
- EC_KEY *eckey = EC_KEY_new();
+ EC_KEY *eckey;
+ eckey = EC_KEY_new_by_curve_name(NID_secp192k1);
if (eckey == NULL)
{
/* error */
}
- key->group = EC_GROUP_new_by_nid(NID_secp192k1);
- if (key->group == NULL)
- {
- /* error */
- }
if (!EC_KEY_generate_key(eckey))
{
/* error */
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