f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
360 lines
13 KiB
Groff
360 lines
13 KiB
Groff
.\" $NetBSD: openssl_pkcs8.1,v 1.10 2003/07/24 14:16:52 itojun Exp $
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.\"
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.\" Automatically generated by Pod::Man version 1.02
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.\" Thu Jul 24 13:07:44 2003
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.\"
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.\" ======================================================================
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.\" ======================================================================
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.\"
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.IX Title "PKCS8 1"
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.TH PKCS8 1 "0.9.7b" "2003-01-31" "OpenSSL"
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.UC
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.SH "NAME"
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pkcs8 \- PKCS#8 format private key conversion tool
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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 \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\-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\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in openssl(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\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in openssl(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\s0 \s-1STRING\s0
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but some software just includes the structure itself without the
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surrounding \s-1OCTET\s0 \s-1STRING\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\s0 \s-1STRING\s0
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contains an \s-1ASN1\s0 \s-1SEQUENCE\s0 consisting of two structures: a \s-1SEQUENCE\s0 containing
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the parameters and an \s-1ASN1\s0 \s-1INTEGER\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\-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 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 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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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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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\s0 \s-1PBE-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\s0 \s-1PBE-MD2\-RC2\-64\s0 \s-1PBE-MD5\-RC2\-64\s0 \s-1PBE-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\s0 \s-1PBE-SHA1\-RC4\-40\s0 \s-1PBE-SHA1\-3DES\s0 \s-1PBE-SHA1\-2DES\s0 \s-1PBE-SHA1\-RC2\-128\s0 \s-1PBE-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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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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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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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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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\s0, \s-1DES\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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|
openssl_dsa(1), openssl_rsa(1), openssl_genrsa(1),
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openssl_gendsa(1)
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