GCA and GRCA certificate that works with Android 7.0

GRCA1_GRCA1_5_GCA2.crt

-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

還是會有 SEC_ERROR_UNKNOWN_ISSUER。

Android 7.0 已經解決，crt 檔更新如上，也可以在 http://gca.nat.gov.tw/download/GRCA1_5_GCA2.zip 下載。

重新設定方式，請參考： http://gca.nat.gov.tw/web2/form02.html

crt 再次更新，將 GRCA 1 to GRCA 1.5 的串鏈也加上了，Qualys SSL Labs 測試評等由 B 昇為 A。

subject=/C=TW/O=\xE8\xA1\x8C\xE6\x94\xBF\xE9\x99\xA2/CN=\xE6\x94\xBF\xE5\xBA\x9C\xE4\xBC\xBA\xE6\x9C\x8D\xE5\x99\xA8\xE6\x95\xB8\xE4\xBD\x8D\xE6\x86\x91\xE8\xAD\x89\xE7\xAE\xA1\xE7\x90\x86\xE4\xB8\xAD\xE5\xBF\x83 - G1
issuer=/C=TW/O=Chunghwa Telecom Co., Ltd./CN=ePKI Root Certification Authority - G2
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

subject=/C=TW/O=Chunghwa Telecom Co., Ltd./CN=ePKI Root Certification Authority - G2
issuer=/C=TW/O=Chunghwa Telecom Co., Ltd./OU=ePKI Root Certification Authority
-----BEGIN CERTIFICATE-----
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subject=/C=TW/O=Chunghwa Telecom Co., Ltd./OU=ePKI Root Certification Authority
issuer=/C=TW/O=Chunghwa Telecom Co., Ltd./OU=ePKI Root Certification Authority
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

2019/09/02 之後申請的憑證改用以上串鍊即可。