/**********************************************************************
?*?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??2017-11-21?01:54??go-ethereum-release-1.7\
?????文件??????????98??2017-11-21?01:54??go-ethereum-release-1.7\.dockerignore
?????文件??????????66??2017-11-21?01:54??go-ethereum-release-1.7\.gitattributes
?????目錄???????????0??2017-11-21?01:54??go-ethereum-release-1.7\.github\
?????文件?????????293??2017-11-21?01:54??go-ethereum-release-1.7\.github\CODEOWNERS
?????文件?????????702??2017-11-21?01:54??go-ethereum-release-1.7\.github\CONTRIBUTING.md
?????文件?????????468??2017-11-21?01:54??go-ethereum-release-1.7\.github\ISSUE_TEMPLATE.md
?????文件?????????664??2017-11-21?01:54??go-ethereum-release-1.7\.gitignore
?????文件??????????84??2017-11-21?01:54??go-ethereum-release-1.7\.gitmodules
?????文件????????2781??2017-11-21?01:54??go-ethereum-release-1.7\.mailmap
?????文件????????8221??2017-11-21?01:54??go-ethereum-release-1.7\.travis.yml
?????目錄???????????0??2017-11-21?01:54??go-ethereum-release-1.7\accounts\
?????目錄???????????0??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\
?????文件????????3850??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\abi.go
?????文件???????12365??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\abi_test.go
?????文件????????1441??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\argument.go
?????目錄???????????0??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\
?????文件????????2122??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\auth.go
?????文件????????4692??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\backend.go
?????目錄???????????0??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\backends\
?????文件???????12110??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\backends\simulated.go
?????文件????????8665??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\base.go
?????文件???????10124??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\bind.go
?????文件???????49263??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\bind_test.go
?????文件???????18952??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\template.go
?????文件????????2547??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\util.go
?????文件????????2936??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\bind\util_test.go
?????文件????????1227??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\doc.go
?????文件????????2677??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\error.go
?????文件????????4189??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\event.go
?????文件????????1795??2017-11-21?01:54??go-ethereum-release-1.7\accounts\abi\event_test.go
............此處省略2493個文件信息