X509RFC5280规范
X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280规范X509RFC5280
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PDF 的RFC 英文原版，我还以为有翻译呢，那直接从官网下载就好了，https://tools.ietf.org/html/rfc5280