Openssl从证书中获取公钥

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openssl x509 -in ca.crt -pubkey

其中 －in 为输入文件名

结果：

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-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvLgG+bUnsMJCgAf/lGWh
2vqn3ZgoKHwERvgVmgCdn8LPUwc2/kGf6ucmkHKE+VcZ7qQg7A/2K8PyDvs3K+qS
SpkyeC0lhaUxYFJGmSjdeqDkLF+fJ5DcTgqi9sJJfozQN2Uk5ppsN76t4BEW7IW/
a8NReMJ18iB3H18wcJQS0ml4pf/O5h3YxArbGl5LE2sWVRFvE9cSn/Vi+zjMP4e8
FIMWi6snIhQpXUMQmP7ecCfzEAEtfVDEXa2Dzka+FJpnJNJ2nQXJIEWF55YOOe1D
4gJAl9qsI8cVEnZK3fseqHpZ8kKY2SuGyNlsgEf7+DfUT/m3Igg+n2MsoxndtOUi
GwIDAQAB
-----END PUBLIC KEY-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----