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23 lines
755 B
Markdown
23 lines
755 B
Markdown
# openssl
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> OpenSSL cryptographic toolkit.
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- Generate a 2048bit RSA private key and save it to a file:
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`openssl genrsa -out {{filename.key}} 2048`
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- Generate a certificate signing request to be sent to a certificate authority:
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`openssl req -new -sha256 -key {{filename.key}} -out {{filename.csr}}`
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- Generate a self-signed certificate from a certificate signing request valid for some number of days:
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`openssl x509 -req -days {{days}} -in {{filename.csr}} -signkey {{filename.key}} -out {{filename.crt}}`
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- Display the certificate presented by an SSL/TLS server:
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`openssl s_client -connect {{host}}:{{port}} </dev/null`
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- Display the complete certificate chain of an HTTPS server:
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`openssl s_client -connect {{host}}:443 -showcerts </dev/null`
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