373 lines
14 KiB
Groff
373 lines
14 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "PKCS8 1"
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.TH PKCS8 1 "2016-09-26" "1.0.2j" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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pkcs8 \- PKCS#8 format private key conversion tool
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBpkcs8\fR
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[\fB\-topk8\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\-noiter\fR]
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[\fB\-nocrypt\fR]
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[\fB\-nooct\fR]
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[\fB\-embed\fR]
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[\fB\-nsdb\fR]
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[\fB\-v2 alg\fR]
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[\fB\-v2prf alg\fR]
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[\fB\-v1 alg\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 \fBpkcs8\fR command processes private keys in PKCS#8 format. It can handle
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both unencrypted PKCS#8 PrivateKeyInfo format and EncryptedPrivateKeyInfo
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format with a variety of PKCS#5 (v1.5 and v2.0) and PKCS#12 algorithms.
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.SH "COMMAND OPTIONS"
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.IX Header "COMMAND OPTIONS"
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.IP "\fB\-topk8\fR" 4
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.IX Item "-topk8"
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Normally a PKCS#8 private key is expected on input and a traditional format
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private key will be written. With the \fB\-topk8\fR option the situation is
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reversed: it reads a traditional format private key and writes a PKCS#8
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format key.
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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. If a PKCS#8 format key is expected on input
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then either a \fB\s-1DER\s0\fR or \fB\s-1PEM\s0\fR encoded version of a PKCS#8 key will be
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expected. Otherwise the \fB\s-1DER\s0\fR or \fB\s-1PEM\s0\fR format of the traditional format
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private key is used.
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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 PHRASE ARGUMENTS\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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default. 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 PHRASE ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
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.IP "\fB\-nocrypt\fR" 4
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.IX Item "-nocrypt"
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PKCS#8 keys generated or input are normally PKCS#8 EncryptedPrivateKeyInfo
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structures using an appropriate password based encryption algorithm. With
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this option an unencrypted PrivateKeyInfo structure is expected or output.
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This option does not encrypt private keys at all and should only be used
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when absolutely necessary. Certain software such as some versions of Java
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code signing software used unencrypted private keys.
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.IP "\fB\-nooct\fR" 4
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.IX Item "-nooct"
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This option generates \s-1RSA\s0 private keys in a broken format that some software
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uses. Specifically the private key should be enclosed in a \s-1OCTET STRING\s0
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but some software just includes the structure itself without the
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surrounding \s-1OCTET STRING.\s0
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.IP "\fB\-embed\fR" 4
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.IX Item "-embed"
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This option generates \s-1DSA\s0 keys in a broken format. The \s-1DSA\s0 parameters are
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embedded inside the PrivateKey structure. In this form the \s-1OCTET STRING\s0
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contains an \s-1ASN1 SEQUENCE\s0 consisting of two structures: a \s-1SEQUENCE\s0 containing
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the parameters and an \s-1ASN1 INTEGER\s0 containing the private key.
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.IP "\fB\-nsdb\fR" 4
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.IX Item "-nsdb"
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This option generates \s-1DSA\s0 keys in a broken format compatible with Netscape
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private key databases. The PrivateKey contains a \s-1SEQUENCE\s0 consisting of
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the public and private keys respectively.
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.IP "\fB\-v2 alg\fR" 4
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.IX Item "-v2 alg"
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This option enables the use of PKCS#5 v2.0 algorithms. Normally PKCS#8
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private keys are encrypted with the password based encryption algorithm
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called \fBpbeWithMD5AndDES\-CBC\fR this uses 56 bit \s-1DES\s0 encryption but it
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was the strongest encryption algorithm supported in PKCS#5 v1.5. Using
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the \fB\-v2\fR option PKCS#5 v2.0 algorithms are used which can use any
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encryption algorithm such as 168 bit triple \s-1DES\s0 or 128 bit \s-1RC2\s0 however
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not many implementations support PKCS#5 v2.0 yet. If you are just using
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private keys with OpenSSL then this doesn't matter.
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.Sp
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The \fBalg\fR argument is the encryption algorithm to use, valid values include
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\&\fBdes\fR, \fBdes3\fR and \fBrc2\fR. It is recommended that \fBdes3\fR is used.
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.IP "\fB\-v2prf alg\fR" 4
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.IX Item "-v2prf alg"
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This option sets the \s-1PRF\s0 algorithm to use with PKCS#5 v2.0. A typical value
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values would be \fBhmacWithSHA256\fR. If this option isn't set then the default
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for the cipher is used or \fBhmacWithSHA1\fR if there is no default.
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.IP "\fB\-v1 alg\fR" 4
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.IX Item "-v1 alg"
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This option specifies a PKCS#5 v1.5 or PKCS#12 algorithm to use. A complete
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list of possible algorithms is included below.
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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 its unique \fBid\fR string) will cause \fBpkcs8\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 encrypted form of a \s-1PEM\s0 encode PKCS#8 files uses the following
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headers and footers:
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.PP
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.Vb 2
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\& \-\-\-\-\-BEGIN ENCRYPTED PRIVATE KEY\-\-\-\-\-
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\& \-\-\-\-\-END ENCRYPTED PRIVATE KEY\-\-\-\-\-
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.Ve
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.PP
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The unencrypted form uses:
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.PP
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.Vb 2
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\& \-\-\-\-\-BEGIN PRIVATE KEY\-\-\-\-\-
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\& \-\-\-\-\-END PRIVATE KEY\-\-\-\-\-
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.Ve
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.PP
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Private keys encrypted using PKCS#5 v2.0 algorithms and high iteration
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counts are more secure that those encrypted using the traditional
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SSLeay compatible formats. So if additional security is considered
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important the keys should be converted.
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.PP
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The default encryption is only 56 bits because this is the encryption
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that most current implementations of PKCS#8 will support.
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.PP
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Some software may use PKCS#12 password based encryption algorithms
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with PKCS#8 format private keys: these are handled automatically
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but there is no option to produce them.
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.PP
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It is possible to write out \s-1DER\s0 encoded encrypted private keys in
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PKCS#8 format because the encryption details are included at an \s-1ASN1\s0
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level whereas the traditional format includes them at a \s-1PEM\s0 level.
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.SH "PKCS#5 v1.5 and PKCS#12 algorithms."
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.IX Header "PKCS#5 v1.5 and PKCS#12 algorithms."
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Various algorithms can be used with the \fB\-v1\fR command line option,
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including PKCS#5 v1.5 and PKCS#12. These are described in more detail
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below.
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.IP "\fB\s-1PBE\-MD2\-DES PBE\-MD5\-DES\s0\fR" 4
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.IX Item "PBE-MD2-DES PBE-MD5-DES"
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These algorithms were included in the original PKCS#5 v1.5 specification.
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They only offer 56 bits of protection since they both use \s-1DES.\s0
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.IP "\fB\s-1PBE\-SHA1\-RC2\-64 PBE\-MD2\-RC2\-64 PBE\-MD5\-RC2\-64 PBE\-SHA1\-DES\s0\fR" 4
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.IX Item "PBE-SHA1-RC2-64 PBE-MD2-RC2-64 PBE-MD5-RC2-64 PBE-SHA1-DES"
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These algorithms are not mentioned in the original PKCS#5 v1.5 specification
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but they use the same key derivation algorithm and are supported by some
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software. They are mentioned in PKCS#5 v2.0. They use either 64 bit \s-1RC2\s0 or
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56 bit \s-1DES.\s0
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.IP "\fB\s-1PBE\-SHA1\-RC4\-128 PBE\-SHA1\-RC4\-40 PBE\-SHA1\-3DES PBE\-SHA1\-2DES PBE\-SHA1\-RC2\-128 PBE\-SHA1\-RC2\-40\s0\fR" 4
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.IX Item "PBE-SHA1-RC4-128 PBE-SHA1-RC4-40 PBE-SHA1-3DES PBE-SHA1-2DES PBE-SHA1-RC2-128 PBE-SHA1-RC2-40"
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These algorithms use the PKCS#12 password based encryption algorithm and
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allow strong encryption algorithms like triple \s-1DES\s0 or 128 bit \s-1RC2\s0 to be used.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Convert a private from traditional to PKCS#5 v2.0 format using triple
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\&\s-1DES:\s0
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.PP
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.Vb 1
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\& openssl pkcs8 \-in key.pem \-topk8 \-v2 des3 \-out enckey.pem
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.Ve
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.PP
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Convert a private from traditional to PKCS#5 v2.0 format using \s-1AES\s0 with
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256 bits in \s-1CBC\s0 mode and \fBhmacWithSHA256\fR \s-1PRF:\s0
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.PP
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.Vb 1
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\& openssl pkcs8 \-in key.pem \-topk8 \-v2 aes\-256\-cbc \-v2prf hmacWithSHA256 \-out enckey.pem
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.Ve
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.PP
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Convert a private key to PKCS#8 using a PKCS#5 1.5 compatible algorithm
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(\s-1DES\s0):
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.PP
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.Vb 1
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\& openssl pkcs8 \-in key.pem \-topk8 \-out enckey.pem
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.Ve
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.PP
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Convert a private key to PKCS#8 using a PKCS#12 compatible algorithm
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(3DES):
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.PP
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.Vb 1
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\& openssl pkcs8 \-in key.pem \-topk8 \-out enckey.pem \-v1 PBE\-SHA1\-3DES
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.Ve
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.PP
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Read a \s-1DER\s0 unencrypted PKCS#8 format private key:
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.PP
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.Vb 1
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\& openssl pkcs8 \-inform DER \-nocrypt \-in key.der \-out key.pem
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.Ve
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.PP
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Convert a private key from any PKCS#8 format to traditional format:
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.PP
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.Vb 1
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\& openssl pkcs8 \-in pk8.pem \-out key.pem
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.Ve
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.SH "STANDARDS"
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.IX Header "STANDARDS"
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Test vectors from this PKCS#5 v2.0 implementation were posted to the
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pkcs-tng mailing list using triple \s-1DES, DES\s0 and \s-1RC2\s0 with high iteration
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counts, several people confirmed that they could decrypt the private
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keys produced and Therefore it can be assumed that the PKCS#5 v2.0
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implementation is reasonably accurate at least as far as these
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algorithms are concerned.
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.PP
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The format of PKCS#8 \s-1DSA \s0(and other) private keys is not well documented:
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it is hidden away in PKCS#11 v2.01, section 11.9. OpenSSL's default \s-1DSA\s0
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PKCS#8 private key format complies with this standard.
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.SH "BUGS"
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.IX Header "BUGS"
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There should be an option that prints out the encryption algorithm
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in use and other details such as the iteration count.
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.PP
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PKCS#8 using triple \s-1DES\s0 and PKCS#5 v2.0 should be the default private
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key format for OpenSSL: for compatibility several of the utilities use
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the old format at present.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIdsa\fR\|(1), \fIrsa\fR\|(1), \fIgenrsa\fR\|(1),
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\&\fIgendsa\fR\|(1)
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