2023-11-20 02:38:22 +00:00
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.\" $OpenBSD: EVP_OpenInit.3,v 1.9 2023/11/16 20:27:43 schwarze Exp $
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2023-04-30 01:15:27 +00:00
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.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
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.\"
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.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
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.\" Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" 3. All advertising materials mentioning features or use of this
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.\" software must display the following acknowledgment:
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.\" "This product includes software developed by the OpenSSL Project
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.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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.\"
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.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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.\" endorse or promote products derived from this software without
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.\" prior written permission. For written permission, please contact
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.\" openssl-core@openssl.org.
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.\"
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.\" 5. Products derived from this software may not be called "OpenSSL"
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.\" nor may "OpenSSL" appear in their names without prior written
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.\" permission of the OpenSSL Project.
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.\"
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.\" 6. Redistributions of any form whatsoever must retain the following
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.\" acknowledgment:
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.\" "This product includes software developed by the OpenSSL Project
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.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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.\" OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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2023-11-20 02:38:22 +00:00
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.Dd $Mdocdate: November 16 2023 $
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2023-04-30 01:15:27 +00:00
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.Dt EVP_OPENINIT 3
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.Os
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.Sh NAME
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.Nm EVP_OpenInit ,
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.Nm EVP_OpenUpdate ,
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.Nm EVP_OpenFinal
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.Nd EVP envelope decryption
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.Sh SYNOPSIS
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.In openssl/evp.h
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.Ft int
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.Fo EVP_OpenInit
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.Fa "EVP_CIPHER_CTX *ctx"
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.Fa "EVP_CIPHER *type"
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.Fa "unsigned char *ek"
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.Fa "int ekl"
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.Fa "unsigned char *iv"
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.Fa "EVP_PKEY *priv"
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.Fc
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.Ft int
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.Fo EVP_OpenUpdate
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.Fa "EVP_CIPHER_CTX *ctx"
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.Fa "unsigned char *out"
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.Fa "int *outl"
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.Fa "unsigned char *in"
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.Fa "int inl"
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.Fc
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.Ft int
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.Fo EVP_OpenFinal
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.Fa "EVP_CIPHER_CTX *ctx"
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.Fa "unsigned char *out"
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.Fa "int *outl"
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.Fc
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.Sh DESCRIPTION
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The EVP envelope routines are a high level interface to envelope
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decryption.
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They decrypt a public key encrypted symmetric key and then decrypt data
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using it.
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.Pp
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.Fn EVP_OpenInit
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initializes a cipher context
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.Fa ctx
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for decryption with cipher
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.Fa type .
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It decrypts the encrypted symmetric key of length
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.Fa ekl
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bytes passed in the
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.Fa ek
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parameter using the private key
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.Fa priv .
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The IV is supplied in the
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.Fa iv
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parameter.
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.Pp
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.Fn EVP_OpenUpdate
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and
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.Fn EVP_OpenFinal
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have exactly the same properties as the
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.Xr EVP_DecryptUpdate 3
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and
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.Xr EVP_DecryptFinal 3
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routines.
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.Pp
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It is possible to call
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.Fn EVP_OpenInit
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twice in the same way as
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.Xr EVP_DecryptInit 3 .
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The first call should have
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.Fa priv
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set to
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.Dv NULL
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and (after setting any cipher parameters) it should be
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called again with
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.Fa type
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set to
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.Dv NULL .
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.Pp
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If the cipher passed in the
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.Fa type
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parameter is a variable length cipher then the key length will be set to
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the value of the recovered key length.
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If the cipher is a fixed length cipher then the recovered key length
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must match the fixed cipher length.
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.Pp
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.Fn EVP_OpenUpdate
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is implemented as a macro.
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2023-04-30 01:15:27 +00:00
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.Sh RETURN VALUES
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.Fn EVP_OpenInit
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returns 0 on error or a non-zero integer (actually the recovered secret
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key size) if successful.
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.Pp
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.Fn EVP_OpenUpdate
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returns 1 for success or 0 for failure.
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.Pp
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.Fn EVP_OpenFinal
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returns 0 if the decrypt failed or 1 for success.
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.Sh SEE ALSO
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.Xr evp 3 ,
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.Xr EVP_EncryptInit 3 ,
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.Xr EVP_SealInit 3
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.Sh HISTORY
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.Fn EVP_OpenInit ,
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.Fn EVP_OpenUpdate ,
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and
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.Fn EVP_OpenFinal
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first appeared in SSLeay 0.5.1 and have been available since
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.Ox 2.4 .
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