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SSLのkey/certificationが正しいPairか調べる(verifyする)

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Nginx にSSLを設定していて、以下のようなエラーにぶつかった。

SSL_CTX_use_PrivateKey_file(" ... /www.example.com.key") failed
   (SSL: error:0B080074:x509 certificate routines:
    X509_check_private_key:key values mismatch)

Private keyで、Certification(証明書)が読み込めない様子。
CertificationとKeyの一致をNginxの設定と切り離して検証するために、OpenSSLコマンドを使って検証する方法.

(ネットで検索しただけです)

a. まず、Keyを検証

$openssl rsa -in /key/path/name.key -modulus -noout | openssl md5
(stdin)= 値1

b. Certificationを検証

openssl x509 -in /crt/path/name.crt -modulus -noout | openssl md5
(stdin)= 値2

値1 と 値2 が一致していれば、オッケ一です。

参照
https://support.f5.com/kb/en-us/solutions/public/6000/700/sol6746.html

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