小编给大家分享一下Linux中如何使用ssh-keygen命令，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

Linux常用命令ssh-keygen命令用于为“ssh”生成、管理和转换认证密钥，它支持RSA和DSA两种认证密钥。

语法ssh-keygen[-q][-bbits]-ttype[-Nnew_passphrase][-Ccomment][-foutput_keyfile]ssh-keygen-p[-Pold_passphrase][-Nnew_passphrase][-fkeyfile]ssh-keygen-i[-finput_keyfile]ssh-keygen-e[-finput_keyfile]ssh-keygen-y[-finput_keyfile]ssh-keygen-c[-Ppassphrase][-Ccomment][-fkeyfile]ssh-keygen-l[-finput_keyfile]ssh-keygen-B[-finput_keyfile]ssh-keygen-Dreaderssh-keygen-Fhostname[-fknown_hosts_file]ssh-keygen-H[-fknown_hosts_file]ssh-keygen-Rhostname[-fknown_hosts_file]ssh-keygen-Ureader[-finput_keyfile]ssh-keygen-rhostname[-finput_keyfile][-g]ssh-keygen-Goutput_file[-v][-bbits][-Mmemory][-Sstart_point]ssh-keygen-Toutput_file-finput_file[-v][-anum_trials][-Wgenerator]常用选项

-b：指定密钥长度；-e：读取openssh的私钥或者公钥文件；-C：添加注释；-f：指定用来保存密钥的文件名；-i：读取未加密的ssh-v2兼容的私钥/公钥文件，然后在标准输出设备上显示openssh兼容的私钥/公钥；-l：显示公钥文件的指纹数据；-N：提供一个新密语；-P：提供（旧）密语；-q：静默模式；-t：指定要创建的密钥类型。参考示例

创建一个默认密钥

[root@localhost~]#ssh-keygenGeneratingpublic/privatersakeypair.Enterfileinwhichtosavethekey(/root/.ssh/id_rsa):Enterpassphrase(emptyfornopassphrase):Entersamepassphraseagain:Youridentificationhasbeensavedin/root/.ssh/id_rsa.Yourpublickeyhasbeensavedin/root/.ssh/id_rsa.pub.Thekeyfingerprintis:SHA256:QfclO+AvXZ/O6vGNfzo4P2pftiHRoKG2fgc5p9bvu1oroot@localhost.localdomainThekey'srandomartimageis:+---[RSA2048]----+|.o..||.oo+||...+..||..oooo..||So..+.o.||..=.+||.*+Eo||.++oO+=||.o.+OO%*|+----[SHA256]-----+[root@localhost~]#

指定要创建的密钥类型

[root@localhost~]#ssh-keygen-trsaGeneratingpublic/privatersakeypair.Enterfileinwhichtosavethekey(/root/.ssh/id_rsa):/root/.ssh/id_rsaalreadyexists.Overwrite(y/n)?yEnterpassphrase(emptyfornopassphrase):Entersamepassphraseagain:Youridentificationhasbeensavedin/root/.ssh/id_rsa.Yourpublickeyhasbeensavedin/root/.ssh/id_rsa.pub.Thekeyfingerprintis:SHA256:nTaoqOxlG6IQQ2zDTMvSk2EON+4tLrYqPy7IBrstoy4root@localhost.localdomainThekey'srandomartimageis:+---[RSA2048]----+|..=||*B.+||.X*||+..oo.||oo.S=||.+.....||*oo=.||EBo=o||%@B..|+----[SHA256]-----+[root@localhost~]#

使用-t参数创建一个指定密钥的类型并添加注释

[root@localhost~]#ssh-keygen-trsa-C"deng@qq.com"Generatingpublic/privatersakeypair.Enterfileinwhichtosavethekey(/root/.ssh/id_rsa):/root/.ssh/id_rsaalreadyexists.Overwrite(y/n)?yEnterpassphrase(emptyfornopassphrase):Entersamepassphraseagain:Youridentificationhasbeensavedin/root/.ssh/id_rsa.Yourpublickeyhasbeensavedin/root/.ssh/id_rsa.pub.Thekeyfingerprintis:SHA256:Wx3MWwj36fwhcnb6hjdIIJ3SUggCLcmFq62Earqy2E0deng@qq.comThekey'srandomartimageis:+---[RSA2048]----+|..*o..o.||=...*o.||o+*+||.+**||.oS=.++oo||.o.o+.+..||o.E...o.||++oo.+||Oo..o..|+----[SHA256]-----+[root@localhost~]#

读取openssh的私钥或者公钥文件

[root@localhost~]#ssh-keygen-eEnterfileinwhichthekeyis(/root/.ssh/id_rsa):----BEGINSSH2PUBLICKEY----Comment:"2048-bitRSA,convertedbyroot@localhost.localdomainfromO"AAAAB3NzaC1yc2EAAAADAQABAAABAQCyQ/iZYPZHH7+4Gcfq259xChnidsf25piKsnRi+o/XZcD0s9QL8oX24OuX5pPQcmfD6Rw6sQCrTy66LrSw2NmPpKc0XdUbXEkLYBN4d3SY+ZLT3Ot8L6jaDmwgXsBu8lTXzAEWLm+16RXAZAB/27ohi48PfcIDYyeJ1JDpieCJ1/a/KrR9V4erWVBt/ZE8KoC0MTQlUn7H3oABVS9O6sdY4dYc/T9l33EbqZMc2feYZnuWtrPdrYfz37C+kzg3ZrDojGXtiWk1p/PG5KoAH6GzuYYIuMtrUTnadRv4wZo29RF+n5Ty8HEeYqSceHWWvwJjqnpqj9cgeNQvq6E3PJbD----ENDSSH2PUBLICKEY----[root@localhost~]#

安静模式生成密钥对

[root@localhost~]#ssh-keygen-q-trsaEnterfileinwhichtosavethekey(/root/.ssh/id_rsa):/root/.ssh/id_rsaalreadyexists.Overwrite(y/n)?yEnterpassphrase(emptyfornopassphrase):Entersamepassphraseagain:[root@localhost~]#

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