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136 lines
3.9 KiB
136 lines
3.9 KiB
1 year ago
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.TH sshpk\-conv 1 "Jan 2016" sshpk "sshpk Commands"
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.SH NAME
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.PP
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sshpk\-conv \- convert between key formats
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.SH SYNOPSYS
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.PP
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\fB\fCsshpk\-conv\fR \-t FORMAT [FILENAME] [OPTIONS...]
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.PP
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\fB\fCsshpk\-conv\fR \-i [FILENAME] [OPTIONS...]
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.SH DESCRIPTION
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.PP
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Reads in a public or private key and converts it between different formats,
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particularly formats used in the SSH protocol and the well\-known PEM PKCS#1/7
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formats.
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.PP
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In the second form, with the \fB\fC\-i\fR option given, identifies a key and prints to
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stderr information about its nature, size and fingerprint.
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.SH EXAMPLES
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.PP
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Assume the following SSH\-format public key in \fB\fCid_ecdsa.pub\fR:
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.PP
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.RS
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.nf
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ecdsa\-sha2\-nistp256 AAAAE2VjZHNhLXNoYTI...9M/4c4= user@host
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.fi
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.RE
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.PP
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Identify it with \fB\fC\-i\fR:
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.PP
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.RS
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.nf
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$ sshpk\-conv \-i id_ecdsa.pub
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id_ecdsa: a 256 bit ECDSA public key
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ECDSA curve: nistp256
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Comment: user@host
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Fingerprint:
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SHA256:vCNX7eUkdvqqW0m4PoxQAZRv+CM4P4fS8+CbliAvS4k
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81:ad:d5:57:e5:6f:7d:a2:93:79:56:af:d7:c0:38:51
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.fi
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.RE
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.PP
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Convert it to \fB\fCpkcs8\fR format, for use with e.g. OpenSSL:
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.PP
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.RS
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.nf
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$ sshpk\-conv \-t pkcs8 id_ecdsa
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\-\-\-\-\-BEGIN PUBLIC KEY\-\-\-\-\-
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MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEAsA4R6N6AS3gzaPBeLjG2ObSgUsR
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zOt+kWJoijLnw3ZMYUKmAx+lD0I5XUxdrPcs1vH5f3cn9TvRvO9L0z/hzg==
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\-\-\-\-\-END PUBLIC KEY\-\-\-\-\-
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.fi
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.RE
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.PP
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Retrieve the public half of a private key:
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.PP
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.RS
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.nf
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$ openssl genrsa 2048 | sshpk\-conv \-t ssh \-c foo@bar
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ssh\-rsa AAAAB3NzaC1yc2EAAA...koK7 foo@bar
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.fi
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.RE
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.PP
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Convert a private key to PKCS#1 (OpenSSL) format from a new\-style OpenSSH key
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format (the \fB\fCssh\-keygen \-o\fR format):
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.PP
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.RS
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.nf
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$ ssh\-keygen \-o \-f foobar
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\&...
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$ sshpk\-conv \-p \-t pkcs1 foobar
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\-\-\-\-\-BEGIN RSA PRIVATE KEY\-\-\-\-\-
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MIIDpAIBAAKCAQEA6T/GYJndb1TRH3+NL....
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\-\-\-\-\-END RSA PRIVATE KEY\-\-\-\-\-
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.fi
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.RE
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.SH OPTIONS
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.TP
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\fB\fC\-i, \-\-identify\fR
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Instead of converting the key, output identifying information about it to
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stderr, including its type, size and fingerprints.
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.TP
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\fB\fC\-p, \-\-private\fR
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Treat the key as a private key instead of a public key (the default). If you
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supply \fB\fCsshpk\-conv\fR with a private key and do not give this option, it will
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extract only the public half of the key from it and work with that.
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.TP
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\fB\fC\-f PATH, \-\-file=PATH\fR
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Input file to take the key from instead of stdin. If a filename is supplied
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as a positional argument, it is equivalent to using this option.
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.TP
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\fB\fC\-o PATH, \-\-out=PATH\fR
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Output file name to use instead of stdout.
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.PP
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\fB\fC\-T FORMAT, \-\-informat=FORMAT\fR
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.TP
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\fB\fC\-t FORMAT, \-\-outformat=FORMAT\fR
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Selects the input and output formats to be used (see FORMATS, below).
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.TP
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\fB\fC\-c TEXT, \-\-comment=TEXT\fR
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Sets the key comment for the output file, if supported.
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.SH FORMATS
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.PP
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Currently supported formats:
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.TP
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\fB\fCpem, pkcs1\fR
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The standard PEM format used by older OpenSSH and most TLS libraries such as
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OpenSSL. The classic \fB\fCid_rsa\fR file is usually in this format. It is an ASN.1
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encoded structure, base64\-encoded and placed between PEM headers.
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.TP
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\fB\fCssh\fR
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The SSH public key text format (the format of an \fB\fCid_rsa.pub\fR file). A single
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line, containing 3 space separated parts: the key type, key body and optional
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key comment.
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.TP
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\fB\fCpkcs8\fR
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A newer PEM format, usually used only for public keys by TLS libraries such
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as OpenSSL. The ASN.1 structure is more generic than that of \fB\fCpkcs1\fR\&.
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.TP
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\fB\fCopenssh\fR
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The new \fB\fCssh\-keygen \-o\fR format from OpenSSH. This can be mistaken for a PEM
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encoding but is actually an OpenSSH internal format.
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.TP
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\fB\fCrfc4253\fR
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The internal binary format of keys when sent over the wire in the SSH
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protocol. This is also the format that the \fB\fCssh\-agent\fR uses in its protocol.
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.SH SEE ALSO
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.PP
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.BR ssh-keygen (1),
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.BR openssl (1)
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.SH BUGS
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.PP
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Encrypted (password\-protected) keys are not supported.
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.PP
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Report bugs at Github
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\[la]https://github.com/arekinath/node-sshpk/issues\[ra]
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