Sortix 1.1dev nightly manual
This manual documents Sortix 1.1dev nightly, a development build that has not been officially released. You can instead view this document in the latest official manual.
EVP_OPENINIT(3) | Library Functions Manual | 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(3)
and
EVP_DecryptFinal(3)
routines.
It is possible to call EVP_OpenInit
() twice
in the same way as
EVP_DecryptInit(3).
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(3), EVP_EncryptInit(3), EVP_SealInit(3)HISTORY
EVP_OpenInit
(),
EVP_OpenUpdate
(), and
EVP_OpenFinal
() first appeared in SSLeay
0.5.1 and have been available since OpenBSD 2.4.June 7, 2019 | Debian |