[B<-sigfile file>]
[B<-inkey file>]
[B<-keyform PEM|DER>]
+[B<-passin arg>]
[B<-peerkey file>]
[B<-peerform PEM|DER>]
[B<-pubin>]
[B<-pkeyopt opt:value>]
[B<-hexdump>]
[B<-asn1parse>]
+[B<-engine id>]
=head1 DESCRIPTION
=item B<-keyform PEM|DER>
-the key format PEM or DER.
+the key format PEM, DER or ENGINE.
+
+=item B<-passin arg>
+
+the input key password source. For more information about the format of B<arg>
+see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
+
=item B<-peerkey file>
=item B<-peerform PEM|DER>
-the peer key format PEM or DER.
+the peer key format PEM, DER or ENGINE.
+
+=item B<-engine id>
+
+specifying an engine (by its unique B<id> string) will cause B<pkeyutl>
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed. The engine will then be set as the default
+for all available algorithms.
+
=item B<-pubin>
=head1 RSA ALGORITHM
-The RSA algorithm supports encrypt, decrypt, sign, verify and verifyrecover
-operations in general. Some padding modes only support some of these
-operations however.
+The RSA algorithm generally supports the encrypt, decrypt, sign,
+verify and verifyrecover operations. However, some padding modes
+support only a subset of these operations. The following additional
+B<pkeyopt> values are supported:
=over 4
-=item -B<rsa_padding_mode:mode>
+=item B<rsa_padding_mode:mode>
This sets the RSA padding mode. Acceptable values for B<mode> are B<pkcs1> for
PKCS#1 padding, B<sslv23> for SSLv23 padding, B<none> for no padding, B<oaep>
digest is set then the a B<DigestInfo> structure is used and its the length
must correspond to the digest type.
-For B<oeap> mode only encryption and decryption is supported.
+For B<oaep> mode only encryption and decryption is supported.
For B<x931> if the digest type is set it is used to format the block data
otherwise the first byte is used to specify the X9.31 digest ID. Sign,
=head1 SEE ALSO
-L<genpkey(1)|genpkey(1)>, L<pkey(1)|pkey(1)>, L<rsautl(1)|rsautl(1)>
-L<dgst(1)|dgst(1)>, L<rsa(1)|rsa(1)>, L<genrsa(1)|genrsa(1)>
+L<genpkey(1)>, L<pkey(1)>, L<rsautl(1)>
+L<dgst(1)>, L<rsa(1)>, L<genrsa(1)>