/**********************************************************************
?*?Copyright?（c）?2015?Pieter?Wuille???????????????????????????????????*
?*?Distributed?under?the?MIT?software?license?see?the?accompanying???*
?*?file?COPYING?or?http://www.opensource.org/licenses/mit-license.php.*
?**********************************************************************/

#include?
#include?

#include?“lax_der_parsing.h“

int?ecdsa_signature_parse_der_lax（const?secp256k1_context*?ctx?secp256k1_ecdsa_signature*?sig?const?unsigned?char?*input?size_t?inputlen）?{
????size_t?rpos?rlen?spos?slen;
????size_t?pos?=?0;
????size_t?lenbyte;
????unsigned?char?tmpsig[64]?=?{0};
????int?overflow?=?0;

????/*?Hack?to?initialize?sig?with?a?correctly-parsed?but?invalid?signature.?*/
????secp256k1_ecdsa_signature_parse_compact（ctx?sig?tmpsig）;

????/*?Sequence?tag?byte?*/
????if?（pos?==?inputlen?||?input[pos]?!=?0x30）?{
????????return?0;
????}
????pos++;

????/*?Sequence?length?bytes?*/
????if?（pos?==?inputlen）?{
????????return?0;
????}
????lenbyte?=?input[pos++];
????if?（lenbyte?&?0x80）?{
????????lenbyte?-=?0x80;
????????if?（pos?+?lenbyte?>?inputlen）?{
????????????return?0;
????????}
????????pos?+=?lenbyte;
????}

????/*?Integer?tag?byte?for?R?*/
????if?（pos?==?inputlen?||?input[pos]?!=?0x02）?{
????????return?0;
????}
????pos++;

????/*?Integer?length?for?R?*/
????if?（pos?==?inputlen）?{
????????return?0;
????}
????lenbyte?=?input[pos++];
????if?（lenbyte?&?0x80）?{
????????lenbyte?-=?0x80;
????????if?（pos?+?lenbyte?>?inputlen）?{
????????????return?0;
????????}
????????while?（lenbyte?>?0?&&?input[pos]?==?0）?{
????????????pos++;
????????????lenbyte--;
????????}
????????if?（lenbyte?>=?sizeof（size_t））?{
????????????return?0;
????????}
????????rlen?=?0;
????????while?（lenbyte?>?0）?{
????????????rlen?=?（rlen?<????????????pos++;
????????????lenbyte--;
????????}
????}?else?{
????????rlen?=?lenbyte;
????}
????if?（rlen?>?inputlen?-?pos）?{
????????return?0;
????}
????rpos?=?pos;
????pos?+=?rlen;

????/*?Integer?tag?byte?for?S?*/
????if?（pos?==?inputlen?||?input[pos]?!=?0x02）?{
????????return?0;
????}
????pos++;

????/*?Integer?length?for?S?*/
????if?（pos?==?inputlen）?{
????????return?0;
????}
????lenbyte?=?input[pos++];
????if?（lenbyte?&?0x80）?{
????????lenbyte?-=?0x80;
????????if?（pos?+?lenbyte?>?inputlen）?{
????????????return?0;
????????}
????????while?（lenbyte?>?0?&&?input[pos]?==?0）?{
????????????pos++;
????????????lenbyte--;
????????}
????????if?（lenbyte?>=?sizeof（size_t））?{
????????????return?0;
????????}
????????slen?=?0;
????????while?（lenbyte?>?0）?{
????????????slen?=?（slen?<????????????pos++;
????????????lenbyte--;
????????}
????}?else?{
????????slen?=?lenbyte;
????}
????if?（slen?>?inputlen?-?pos）?{
????????return?0;
????}
????spos?=?pos;
????pos?+=?slen;

????/*?Ignore?leading?zeroes?in?R?*/
????while?（rlen?>?0?&&?input[rpos]?==?0）?{
????????rlen--;
????????rpos++;
????}
????/*?Copy?R?value?*/
????if?（rlen?>?3

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\
?????文件??????????98??2018-03-28?12:35??go-ethereum-master\.dockerignore
?????文件??????????66??2018-03-28?12:35??go-ethereum-master\.gitattributes
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\.github\
?????文件?????????392??2018-03-28?12:35??go-ethereum-master\.github\CODEOWNERS
?????文件?????????671??2018-03-28?12:35??go-ethereum-master\.github\CONTRIBUTING.md
?????文件?????????468??2018-03-28?12:35??go-ethereum-master\.github\ISSUE_TEMPLATE.md
?????文件?????????625??2018-03-28?12:35??go-ethereum-master\.github\no-response.yml
?????文件?????????684??2018-03-28?12:35??go-ethereum-master\.github\stale.yml
?????文件?????????760??2018-03-28?12:35??go-ethereum-master\.gitignore
?????文件??????????84??2018-03-28?12:35??go-ethereum-master\.gitmodules
?????文件????????3236??2018-03-28?12:35??go-ethereum-master\.mailmap
?????文件????????8081??2018-03-28?12:35??go-ethereum-master\.travis.yml
?????文件????????6477??2018-03-28?12:35??go-ethereum-master\AUTHORS
?????文件???????32397??2018-03-28?12:35??go-ethereum-master\COPYING
?????文件????????7651??2018-03-28?12:35??go-ethereum-master\COPYING.LESSER
?????文件?????????433??2018-03-28?12:35??go-ethereum-master\Dockerfile
?????文件?????????417??2018-03-28?12:35??go-ethereum-master\Dockerfile.alltools
?????文件????????5496??2018-03-28?12:35??go-ethereum-master\Makefile
?????文件???????17879??2018-03-28?12:35??go-ethereum-master\README.md
?????文件???????????6??2018-03-28?12:35??go-ethereum-master\VERSION
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\accounts\
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\accounts\abi\
?????文件????????4201??2018-03-28?12:35??go-ethereum-master\accounts\abi\abi.go
?????文件???????26995??2018-03-28?12:35??go-ethereum-master\accounts\abi\abi_test.go
?????文件????????8801??2018-03-28?12:35??go-ethereum-master\accounts\abi\argument.go
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\accounts\abi\bind\
?????文件????????2122??2018-03-28?12:35??go-ethereum-master\accounts\abi\bind\auth.go
?????文件????????5440??2018-03-28?12:35??go-ethereum-master\accounts\abi\bind\backend.go
?????目錄???????????0??2018-03-28?12:35??go-ethereum-master\accounts\abi\bind\backends\
?????文件???????16218??2018-03-28?12:35??go-ethereum-master\accounts\abi\bind\backends\simulated.go
............此處省略2744個文件信息