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-.\"     $OpenBSD: RSA_public_encrypt.3,v 1.13 2023/09/10 16:04:15 schwarze Exp $
-.\"     OpenSSL RSA_public_encrypt.pod 1e3f62a3 Jul 17 16:47:13 2017 +0200
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2023 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" The original file was written by Ulf Moeller <ulf@openssl.org>.
-.\" Copyright (c) 2000, 2004 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
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-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-.\"
-.Dd $Mdocdate: September 10 2023 $
-.Dt RSA_PUBLIC_ENCRYPT 3
-.Os
-.Sh NAME
-.Nm RSA_public_encrypt ,
-.Nm RSA_private_decrypt ,
-.Nm EVP_PKEY_encrypt_old ,
-.Nm EVP_PKEY_decrypt_old
-.Nd RSA public key cryptography
-.Sh SYNOPSIS
-.In openssl/rsa.h
-.Ft int
-.Fo RSA_public_encrypt
-.Fa "int flen"
-.Fa "const unsigned char *from"
-.Fa "unsigned char *to"
-.Fa "RSA *rsa"
-.Fa "int padding"
-.Fc
-.Ft int
-.Fo RSA_private_decrypt
-.Fa "int flen"
-.Fa "const unsigned char *from"
-.Fa "unsigned char *to"
-.Fa "RSA *rsa"
-.Fa "int padding"
-.Fc
-.In openssl/evp.h
-.Ft int
-.Fo EVP_PKEY_encrypt_old
-.Fa "unsigned char *to"
-.Fa "const unsigned char *from"
-.Fa "int flen"
-.Fa "EVP_PKEY *pkey"
-.Fc
-.Ft int
-.Fo EVP_PKEY_decrypt_old
-.Fa "unsigned char *to"
-.Fa "const unsigned char *from"
-.Fa "int flen"
-.Fa "EVP_PKEY *pkey"
-.Fc
-.Sh DESCRIPTION
-.Fn RSA_public_encrypt
-encrypts the
-.Fa flen
-bytes at
-.Fa from
-(usually a session key) using the public key
-.Fa rsa
-and stores the ciphertext in
-.Fa to .
-.Fa to
-must point to
-.Fn RSA_size rsa
-bytes of memory.
-.Pp
-.Fa padding
-denotes one of the following modes:
-.Bl -tag -width Ds
-.It Dv RSA_PKCS1_PADDING
-PKCS #1 v1.5 padding.
-This currently is the most widely used mode.
-.It Dv RSA_PKCS1_OAEP_PADDING
-EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty
-encoding parameter.
-This mode is recommended for all new applications.
-.It Dv RSA_NO_PADDING
-Raw RSA encryption.
-This mode should only be used to implement cryptographically sound
-padding modes in the application code.
-Encrypting user data directly with RSA is insecure.
-.El
-.Pp
-.Fa flen
-must be less than
-.Fn RSA_size rsa
-- 11 for the PKCS #1 v1.5 based padding modes, less than
-.Fn RSA_size rsa
-- 41 for
-.Dv RSA_PKCS1_OAEP_PADDING
-and exactly
-.Fn RSA_size rsa
-for
-.Dv RSA_NO_PADDING .
-.Pp
-.Fn RSA_private_decrypt
-decrypts the
-.Fa flen
-bytes at
-.Fa from
-using the private key
-.Fa rsa
-and stores the plaintext in
-.Fa to .
-.Fa to
-must point to a memory section large enough to hold the decrypted data
-(which is smaller than
-.Fn RSA_size rsa ) .
-.Fa padding
-is the padding mode that was used to encrypt the data.
-.Pp
-.Fn EVP_PKEY_encrypt_old
-is a deprecated wrapper around
-.Fn RSA_public_encrypt
-that uses the
-.Vt RSA
-public key stored in
-.Fa pkey
-and
-.Dv RSA_PKCS1_PADDING .
-.Pp
-.Fn EVP_PKEY_decrypt_old
-is a deprecated wrapper around
-.Fn RSA_private_decrypt
-that uses the
-.Vt RSA
-private key stored in
-.Fa pkey
-and
-.Dv RSA_PKCS1_PADDING .
-.Sh RETURN VALUES
-.Fn RSA_public_encrypt
-and
-.Fn EVP_PKEY_encrypt_old
-return the size of the encrypted data (i.e.\&
-.Fn RSA_size rsa ) .
-.Fn RSA_private_decrypt
-and
-.Fn EVP_PKEY_decrypt_old
-returns the size of the recovered plaintext.
-On error, \-1 is returned; the error codes can be obtained by
-.Xr ERR_get_error 3 .
-.Pp
-In addition to the return values documented above,
-.Fn EVP_PKEY_encrypt_old
-may return 0 if the
-.Xr EVP_PKEY_id 3
-of
-.Fa pkey
-is not
-.Dv EVP_PKEY_RSA .
-.Sh SEE ALSO
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr RSA_meth_set_priv_dec 3 ,
-.Xr RSA_new 3 ,
-.Xr RSA_size 3
-.Sh STANDARDS
-SSL, PKCS #1 v2.0
-.Sh HISTORY
-.Fn RSA_public_encrypt
-and
-.Fn RSA_private_decrypt
-appeared in SSLeay 0.4 or earlier and have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_PKEY_encrypt
-and
-.Fn EVP_PKEY_decrypt
-first appeared in SSLeay 0.9.0 and have been available since
-.Ox 2.4 .
-There were renamed to
-.Fn EVP_PKEY_encrypt_old
-and
-.Fn EVP_PKEY_decrypt_old
-in OpenSSL 1.0.0 and
-.Ox 4.9 .
-.Pp
-.Dv RSA_NO_PADDING
-is available since SSLeay 0.9.0.
-OAEP was added in OpenSSL 0.9.2b.
-.Sh BUGS
-Decryption failures in the
-.Dv RSA_PKCS1_PADDING
-mode leak information which can potentially be used to mount a
-Bleichenbacher padding oracle attack.
-This is an inherent weakness in the PKCS #1 v1.5 padding design.
-Prefer
-.Dv RSA_PKCS1_OAEP_PADDING .