path: root/crypto/openssl/doc/man3/RSA_private_encrypt.pod
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authorJung-uk Kim <jkim@FreeBSD.org>2018-09-13 20:40:51 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2018-09-13 20:40:51 +0000
commite71b70530d95c4f34d8bdbd78d1242df1ba4a945 (patch)
treead6275bcad7894dc16f27ef882a2934a3d80bc14 /crypto/openssl/doc/man3/RSA_private_encrypt.pod
parent73511c241bab29b078c84d992082cc44513c608d (diff)
parenta43ce912fc025d11e1395506111f75fc194d7ba5 (diff)
Update OpenSSL to 1.1.1.
Note it does not update build infrastructure.
Notes: svn path=/projects/openssl111/; revision=338663
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+=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);
+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
+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
+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.
+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.
+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<RSA_sign(3)>, L<RSA_verify(3)>
+Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (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