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update ecdsa doc

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This commit is contained in:
Nils Larsch 2005-05-19 20:54:22 +00:00
parent cd74dda72a
commit 7b1e7706d8
1 changed files with 22 additions and 44 deletions
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66
doc/crypto/ecdsa.pod
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@ -14,13 +14,11 @@ ecdsa - Elliptic Curve Digital Signature Algorithm
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,
@ -28,6 +26,10 @@ ecdsa - Elliptic Curve Digital Signature Algorithm
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);
@ -72,35 +74,6 @@ the decoded signature in a newly allocated B<ECDSA_SIG> structure.
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>.
@ -108,13 +81,15 @@ ECDSA_sign_setup() may be used to precompute parts of the
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() 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() is wrapper function for ECDSA_sign_ex with B<kinv>
and B<rp> set to NULL.
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.
@ -123,10 +98,13 @@ B<siglen> is a valid ECDSA signature of the hash value
value 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>