mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
4746f25ac6
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7829)
75 lines
2.1 KiB
Plaintext
75 lines
2.1 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
RSA_private_encrypt, RSA_public_decrypt - low level signature operations
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/rsa.h>
|
|
|
|
int RSA_private_encrypt(int flen, unsigned char *from,
|
|
unsigned char *to, RSA *rsa, int padding);
|
|
|
|
int RSA_public_decrypt(int flen, unsigned char *from,
|
|
unsigned char *to, RSA *rsa, int padding);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
These functions handle RSA signatures at a low level.
|
|
|
|
RSA_private_encrypt() signs the B<flen> bytes at B<from> (usually a
|
|
message digest with an algorithm identifier) using the private key
|
|
B<rsa> and stores the signature in B<to>. B<to> must point to
|
|
B<RSA_size(rsa)> bytes of memory.
|
|
|
|
B<padding> denotes one of the following modes:
|
|
|
|
=over 4
|
|
|
|
=item RSA_PKCS1_PADDING
|
|
|
|
PKCS #1 v1.5 padding. This function does not handle the
|
|
B<algorithmIdentifier> specified in PKCS #1. When generating or
|
|
verifying PKCS #1 signatures, L<RSA_sign(3)> and L<RSA_verify(3)> should be
|
|
used.
|
|
|
|
=item RSA_NO_PADDING
|
|
|
|
Raw RSA signature. This mode should I<only> be used to implement
|
|
cryptographically sound padding modes in the application code.
|
|
Signing user data directly with RSA is insecure.
|
|
|
|
=back
|
|
|
|
RSA_public_decrypt() recovers the message digest from the B<flen>
|
|
bytes long signature at B<from> using the signer's public key
|
|
B<rsa>. B<to> must point to a memory section large enough to hold the
|
|
message digest (which is smaller than B<RSA_size(rsa) -
|
|
11>). B<padding> is the padding mode that was used to sign the data.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
RSA_private_encrypt() returns the size of the signature (i.e.,
|
|
RSA_size(rsa)). RSA_public_decrypt() returns the size of the
|
|
recovered message digest.
|
|
|
|
On error, -1 is returned; the error codes can be
|
|
obtained by L<ERR_get_error(3)>.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ERR_get_error(3)>,
|
|
L<RSA_sign(3)>, L<RSA_verify(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|