312 lines
10 KiB
Groff
312 lines
10 KiB
Groff
.\" $NetBSD: openssl_ec.1,v 1.4 2007/11/27 22:19:49 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "EC 1"
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.TH EC 1 "2005-11-24" "0.9.8e" "OpenSSL"
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.SH "NAME"
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ec \- EC key processing
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBec\fR
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[\fB\-inform PEM|DER\fR]
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[\fB\-outform PEM|DER\fR]
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[\fB\-in filename\fR]
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[\fB\-passin arg\fR]
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[\fB\-out filename\fR]
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[\fB\-passout arg\fR]
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[\fB\-des\fR]
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[\fB\-des3\fR]
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[\fB\-idea\fR]
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[\fB\-text\fR]
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[\fB\-noout\fR]
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[\fB\-param_out\fR]
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[\fB\-pubin\fR]
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[\fB\-pubout\fR]
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[\fB\-conv_form arg\fR]
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[\fB\-param_enc arg\fR]
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[\fB\-engine id\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBec\fR command processes \s-1EC\s0 keys. They can be converted between various
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forms and their components printed out. \fBNote\fR OpenSSL uses the
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private key format specified in '\s-1SEC\s0 1: Elliptic Curve Cryptography'
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(http://www.secg.org/). To convert a OpenSSL \s-1EC\s0 private key into the
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PKCS#8 private key format use the \fBpkcs8\fR command.
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.SH "COMMAND OPTIONS"
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.IX Header "COMMAND OPTIONS"
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.IP "\fB\-inform DER|PEM\fR" 4
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.IX Item "-inform DER|PEM"
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This specifies the input format. The \fB\s-1DER\s0\fR option with a private key uses
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an \s-1ASN\s0.1 \s-1DER\s0 encoded \s-1SEC1\s0 private key. When used with a public key it
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uses the SubjectPublicKeyInfo structur as specified in \s-1RFC\s0 3280.
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The \fB\s-1PEM\s0\fR form is the default format: it consists of the \fB\s-1DER\s0\fR format base64
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encoded with additional header and footer lines. In the case of a private key
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PKCS#8 format is also accepted.
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.IP "\fB\-outform DER|PEM\fR" 4
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.IX Item "-outform DER|PEM"
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This specifies the output format, the options have the same meaning as the
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\&\fB\-inform\fR option.
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.IP "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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This specifies the input filename to read a key from or standard input if this
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option is not specified. If the key is encrypted a pass phrase will be
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prompted for.
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.IP "\fB\-passin arg\fR" 4
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.IX Item "-passin arg"
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the input file password source. For more information about the format of \fBarg\fR
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see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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This specifies the output filename to write a key to or standard output by
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is not specified. If any encryption options are set then a pass phrase will be
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prompted for. The output filename should \fBnot\fR be the same as the input
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filename.
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.IP "\fB\-passout arg\fR" 4
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.IX Item "-passout arg"
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the output file password source. For more information about the format of \fBarg\fR
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see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
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.IP "\fB\-des|\-des3|\-idea\fR" 4
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.IX Item "-des|-des3|-idea"
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These options encrypt the private key with the \s-1DES\s0, triple \s-1DES\s0, \s-1IDEA\s0 or
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any other cipher supported by OpenSSL before outputting it. A pass phrase is
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prompted for.
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If none of these options is specified the key is written in plain text. This
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means that using the \fBec\fR utility to read in an encrypted key with no
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encryption option can be used to remove the pass phrase from a key, or by
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setting the encryption options it can be use to add or change the pass phrase.
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These options can only be used with \s-1PEM\s0 format output files.
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.IP "\fB\-text\fR" 4
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.IX Item "-text"
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prints out the public, private key components and parameters.
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.IP "\fB\-noout\fR" 4
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.IX Item "-noout"
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this option prevents output of the encoded version of the key.
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.IP "\fB\-modulus\fR" 4
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.IX Item "-modulus"
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this option prints out the value of the public key component of the key.
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.IP "\fB\-pubin\fR" 4
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.IX Item "-pubin"
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by default a private key is read from the input file: with this option a
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public key is read instead.
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.IP "\fB\-pubout\fR" 4
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.IX Item "-pubout"
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by default a private key is output. With this option a public
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key will be output instead. This option is automatically set if the input is
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a public key.
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.IP "\fB\-conv_form\fR" 4
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.IX Item "-conv_form"
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This specifies how the points on the elliptic curve are converted
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into octet strings. Possible values are: \fBcompressed\fR (the default
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value), \fBuncompressed\fR and \fBhybrid\fR. For more information regarding
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the point conversion forms please read the X9.62 standard.
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\&\fBNote\fR Due to patent issues the \fBcompressed\fR option is disabled
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by default for binary curves and can be enabled by defining
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the preprocessor macro \fB\s-1OPENSSL_EC_BIN_PT_COMP\s0\fR at compile time.
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.IP "\fB\-param_enc arg\fR" 4
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.IX Item "-param_enc arg"
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This specifies how the elliptic curve parameters are encoded.
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Possible value are: \fBnamed_curve\fR, i.e. the ec parameters are
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specified by a \s-1OID\s0, or \fBexplicit\fR where the ec parameters are
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explicitly given (see \s-1RFC\s0 3279 for the definition of the
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\&\s-1EC\s0 parameters structures). The default value is \fBnamed_curve\fR.
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\&\fBNote\fR the \fBimplicitlyCA\fR alternative ,as specified in \s-1RFC\s0 3279,
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is currently not implemented in OpenSSL.
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.IP "\fB\-engine id\fR" 4
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.IX Item "-engine id"
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specifying an engine (by it's unique \fBid\fR string) will cause \fBreq\fR
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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.SH "NOTES"
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.IX Header "NOTES"
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The \s-1PEM\s0 private key format uses the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN EC PRIVATE KEY-----
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\& -----END EC PRIVATE KEY-----
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.Ve
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.PP
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The \s-1PEM\s0 public key format uses the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN PUBLIC KEY-----
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\& -----END PUBLIC KEY-----
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.Ve
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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To encrypt a private key using triple \s-1DES:\s0
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.PP
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.Vb 1
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\& openssl ec -in key.pem -des3 -out keyout.pem
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.Ve
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.PP
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To convert a private key from \s-1PEM\s0 to \s-1DER\s0 format:
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.PP
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.Vb 1
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\& openssl ec -in key.pem -outform DER -out keyout.der
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.Ve
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.PP
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To print out the components of a private key to standard output:
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.PP
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.Vb 1
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\& openssl ec -in key.pem -text -noout
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.Ve
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.PP
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To just output the public part of a private key:
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.PP
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.Vb 1
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\& openssl ec -in key.pem -pubout -out pubkey.pem
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.Ve
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.PP
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To change the parameters encoding to \fBexplicit\fR:
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.PP
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.Vb 1
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\& openssl ec -in key.pem -param_enc explicit -out keyout.pem
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.Ve
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.PP
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To change the point conversion form to \fBcompressed\fR:
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.PP
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.Vb 1
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\& openssl ec -in key.pem -conv_form compressed -out keyout.pem
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIecparam\fR\|(1), \fIopenssl_dsa\fR\|(1), \fIopenssl_rsa\fR\|(1)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The ec command was first introduced in OpenSSL 0.9.8.
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.SH "AUTHOR"
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.IX Header "AUTHOR"
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Nils Larsch for the OpenSSL project (http://www.openssl.org).
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