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EVP_OPENINIT(3)			    OpenSSL		       EVP_OPENINIT(3)

NAME
       EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption

SYNOPSIS
	#include <openssl/evp.h>

	int EVP_OpenInit(EVP_CIPHER_CTX	*ctx, EVP_CIPHER *type,	unsigned char *ek,
			 int ekl, unsigned char	*iv, EVP_PKEY *priv);
	int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx,	unsigned char *out,
			   int *outl, unsigned char *in, int inl);
	int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned	char *out, int *outl);

DESCRIPTION
       The EVP envelope	routines are a high level interface to envelope
       decryption. They	decrypt	a public key encrypted symmetric key and then
       decrypt data using it.

       EVP_OpenInit() initializes a cipher context ctx for decryption with
       cipher type. It decrypts	the encrypted symmetric	key of length ekl
       bytes passed in the ek parameter	using the private key priv.  The IV is
       supplied	in the iv parameter.

       EVP_OpenUpdate()	and EVP_OpenFinal() have exactly the same properties
       as the EVP_DecryptUpdate() and EVP_DecryptFinal() routines, as
       documented on the EVP_EncryptInit(3) manual page.

NOTES
       It is possible to call EVP_OpenInit() twice in the same way as
       EVP_DecryptInit(). The first call should	have priv set to NULL and
       (after setting any cipher parameters) it	should be called again with
       type set	to NULL.

       If the cipher passed in the type	parameter is a variable	length cipher
       then the	key length will	be set to the value of the recovered key
       length. If the cipher is	a fixed	length cipher then the recovered key
       length must match the fixed cipher length.

RETURN VALUES
       EVP_OpenInit() returns 0	on error or a non zero integer (actually the
       recovered secret	key size) if successful.

       EVP_OpenUpdate()	returns	1 for success or 0 for failure.

       EVP_OpenFinal() returns 0 if the	decrypt	failed or 1 for	success.

SEE ALSO
       evp(7), RAND_bytes(3), EVP_EncryptInit(3), EVP_SealInit(3)

COPYRIGHT
       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
       <https://www.openssl.org/source/license.html>.

1.1.1d				  2019-09-10		       EVP_OPENINIT(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | SEE ALSO | COPYRIGHT

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