275 lines
7.5 KiB
Text
275 lines
7.5 KiB
Text
=pod
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=head1 NAME
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pkeyutl - public key algorithm utility
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=head1 SYNOPSIS
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B<openssl> B<pkeyutl>
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[B<-help>]
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[B<-in file>]
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[B<-out file>]
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[B<-sigfile file>]
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[B<-inkey file>]
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[B<-keyform PEM|DER|ENGINE>]
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[B<-passin arg>]
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[B<-peerkey file>]
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[B<-peerform PEM|DER|ENGINE>]
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[B<-pubin>]
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[B<-certin>]
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[B<-rev>]
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[B<-sign>]
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[B<-verify>]
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[B<-verifyrecover>]
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[B<-encrypt>]
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[B<-decrypt>]
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[B<-derive>]
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[B<-kdf algorithm>]
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[B<-kdflen length>]
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[B<-pkeyopt opt:value>]
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[B<-hexdump>]
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[B<-asn1parse>]
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[B<-engine id>]
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[B<-engine_impl>]
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=head1 DESCRIPTION
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The B<pkeyutl> command can be used to perform public key operations using
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any supported algorithm.
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=head1 COMMAND OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-in filename>
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This specifies the input filename to read data from or standard input
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if this option is not specified.
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=item B<-out filename>
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specifies the output filename to write to or standard output by
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default.
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=item B<-sigfile file>
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Signature file, required for B<verify> operations only
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=item B<-inkey file>
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the input key file, by default it should be a private key.
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=item B<-keyform PEM|DER|ENGINE>
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the key format PEM, DER or ENGINE. Default is PEM.
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=item B<-passin arg>
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the input key password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
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=item B<-peerkey file>
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the peer key file, used by key derivation (agreement) operations.
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=item B<-peerform PEM|DER|ENGINE>
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the peer key format PEM, DER or ENGINE. Default is PEM.
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=item B<-pubin>
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the input file is a public key.
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=item B<-certin>
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the input is a certificate containing a public key.
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=item B<-rev>
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reverse the order of the input buffer. This is useful for some libraries
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(such as CryptoAPI) which represent the buffer in little endian format.
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=item B<-sign>
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sign the input data and output the signed result. This requires
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a private key.
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=item B<-verify>
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verify the input data against the signature file and indicate if the
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verification succeeded or failed.
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=item B<-verifyrecover>
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verify the input data and output the recovered data.
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=item B<-encrypt>
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encrypt the input data using a public key.
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=item B<-decrypt>
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decrypt the input data using a private key.
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=item B<-derive>
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derive a shared secret using the peer key.
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=item B<-kdf algorithm>
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Use key derivation function B<algorithm>. The supported algorithms are
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at present B<TLS1-PRF> and B<HKDF>.
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Note: additional paramers and the KDF output length will normally have to be
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set for this to work. See L<EVP_PKEY_HKDF(3)> and L<EVP_PKEY_TLS1_PRF(3)>
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for the supported string parameters of each algorithm.
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=item B<-kdflen length>
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Set the output length for KDF.
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=item B<-pkeyopt opt:value>
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Public key options specified as opt:value. See NOTES below for more details.
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=item B<-hexdump>
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hex dump the output data.
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=item B<-asn1parse>
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asn1parse the output data, this is useful when combined with the
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B<-verifyrecover> option when an ASN1 structure is signed.
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=item B<-engine id>
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specifying an engine (by its unique B<id> string) will cause B<pkeyutl>
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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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=item B<-engine_impl>
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When used with the B<-engine> option, it specifies to also use
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engine B<id> for crypto operations.
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=back
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=head1 NOTES
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The operations and options supported vary according to the key algorithm
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and its implementation. The OpenSSL operations and options are indicated below.
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Unless otherwise mentioned all algorithms support the B<digest:alg> option
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which specifies the digest in use for sign, verify and verifyrecover operations.
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The value B<alg> should represent a digest name as used in the
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EVP_get_digestbyname() function for example B<sha1>.
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This value is used only for sanity-checking the lengths of data passed in to
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the B<pkeyutl> and for creating the structures that make up the signature
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(e.g. B<DigestInfo> in RSASSA PKCS#1 v1.5 signatures).
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In case of RSA, ECDSA and DSA signatures, this utility
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will not perform hashing on input data but rather use the data directly as
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input of signature algorithm. Depending on key type, signature type and mode
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of padding, the maximum acceptable lengths of input data differ. In general,
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with RSA the signed data can't be longer than the key modulus, in case of ECDSA
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and DSA the data shouldn't be longer than field size, otherwise it will be
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silently truncated to field size.
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In other words, if the value of digest is B<sha1> the input should be 20 bytes
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long binary encoding of SHA-1 hash function output.
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=head1 RSA ALGORITHM
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The RSA algorithm generally supports the encrypt, decrypt, sign,
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verify and verifyrecover operations. However, some padding modes
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support only a subset of these operations. The following additional
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B<pkeyopt> values are supported:
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=over 4
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=item B<rsa_padding_mode:mode>
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This sets the RSA padding mode. Acceptable values for B<mode> are B<pkcs1> for
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PKCS#1 padding, B<sslv23> for SSLv23 padding, B<none> for no padding, B<oaep>
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for B<OAEP> mode, B<x931> for X9.31 mode and B<pss> for PSS.
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In PKCS#1 padding if the message digest is not set then the supplied data is
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signed or verified directly instead of using a B<DigestInfo> structure. If a
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digest is set then the a B<DigestInfo> structure is used and its the length
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must correspond to the digest type.
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For B<oaep> mode only encryption and decryption is supported.
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For B<x931> if the digest type is set it is used to format the block data
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otherwise the first byte is used to specify the X9.31 digest ID. Sign,
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verify and verifyrecover are can be performed in this mode.
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For B<pss> mode only sign and verify are supported and the digest type must be
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specified.
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=item B<rsa_pss_saltlen:len>
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For B<pss> mode only this option specifies the salt length. Two special values
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are supported: -1 sets the salt length to the digest length. When signing -2
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sets the salt length to the maximum permissible value. When verifying -2 causes
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the salt length to be automatically determined based on the B<PSS> block
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structure.
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=back
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=head1 DSA ALGORITHM
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The DSA algorithm supports signing and verification operations only. Currently
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there are no additional options other than B<digest>. Only the SHA1
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digest can be used and this digest is assumed by default.
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=head1 DH ALGORITHM
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The DH algorithm only supports the derivation operation and no additional
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options.
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=head1 EC ALGORITHM
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The EC algorithm supports sign, verify and derive operations. The sign and
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verify operations use ECDSA and derive uses ECDH. Currently there are no
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additional options other than B<digest>. Only the SHA1 digest can be used and
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this digest is assumed by default.
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=head1 EXAMPLES
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Sign some data using a private key:
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openssl pkeyutl -sign -in file -inkey key.pem -out sig
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Recover the signed data (e.g. if an RSA key is used):
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openssl pkeyutl -verifyrecover -in sig -inkey key.pem
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Verify the signature (e.g. a DSA key):
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openssl pkeyutl -verify -in file -sigfile sig -inkey key.pem
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Sign data using a message digest value (this is currently only valid for RSA):
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openssl pkeyutl -sign -in file -inkey key.pem -out sig -pkeyopt digest:sha256
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Derive a shared secret value:
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openssl pkeyutl -derive -inkey key.pem -peerkey pubkey.pem -out secret
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Hexdump 48 bytes of TLS1 PRF using digest B<SHA256> and shared secret and
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seed consisting of the single byte 0xFF:
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openssl pkeyutl -kdf TLS1-PRF -kdflen 48 -pkeyopt md:SHA256 \
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-pkeyopt hexsecret:ff -pkeyopt hexseed:ff -hexdump
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=head1 SEE ALSO
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L<genpkey(1)>, L<pkey(1)>, L<rsautl(1)>
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L<dgst(1)>, L<rsa(1)>, L<genrsa(1)>,
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L<EVP_PKEY_HKDF(3)>, L<EVP_PKEY_TLS1_PRF(3)>
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