eckey

) { size_t i; Ec_group *ret = NULL; if (Nid 3) int Ec_key_generate_keyThe ECC public private key is generated according to the key parameter. int Ec_key_generate_key (Ec_key *eckey) { if (Eckey = = NULL | | eckey->group = NULL) { Ecerr (ec_f_ec_ Key_generate_key, err_r_passed_null_parameter); return 0; } if (

generate an empty group, and then P,, B and other parameters to fill the group, and then generate points on the curve based on this group. if (!EC_GROUP_set_curve_GFp(group, p, a, b,ctx)){ gotoerr_process;} P = EC_POINT_new(group);Q = EC_POINT_new(group);R = EC_POINT_new(group);if (!P || !Q || !R){ gotoerr_process;}This section determines all information about the group and generates three points on the curve based on the group (the point must be on the curve, which

. Call evp_verifyupdate. This is done by calling the update callback function initialized in step 1;7. Call evp_verifyfinal to complete the final step. In evp_verifyfinal, call evp_digestfinal_ex to complete the digest calculation, and then call evp_md's verify callback function:Evp_digestfinal_ex ( tmp_ctx, (M [0]), m_len );I = CTX-> digest-> verify (CTX-> digest-> type, M, m_len, sigbuf, siglen, pkey-> pkey. PTR );8. For ECC, the callback function verify is ecdsa_verify. This function finall

initialization;7. Call Evp_verifyfinal to complete the final steps. In Evp_verifyfinal, first call EVP_DIGESTFINAL_EX to complete the calculation of the digest, and then call EVP_MD's Verify callback function:EVP_DIGESTFINAL_EX (tmp_ctx, (m[0]), m_len);i = ctx->digest->verify (Ctx->digest->type,m,m_len, sigbuf,siglen,pkey->pkey.ptr);8. For ECC, the callback function verify is ecdsa_verify, which eventually calls Ecdsa_do_verify:int ecdsa_do_verify (const unsigned char *dgst, int dgst_len,Const

follows: 1, the receiving party after receiving the message (m) and the signature value (R,s), the following operation 2, Calculation: Sg+h (m) p= (x1,y1), r1≡x1 mod P. 3. Verification equation: R1≡r mod p. 4, if the equation is established, accept the signature, otherwise the signature is invalid. The following is a section of the OpenSSL source API (D:\OPENSSL-1.0.1E\CRYPTO\ECDSA) [CPP] view plain copy print? int ecdsa_sign (int type, const unsigned char *dgst, int dlen, unsigned char *sig,