EVP_OpenInit(3)
- NetBSD Manual Pages
EVP_OpenInit(3) OpenSSL EVP_OpenInit(3)
NAME
EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope
decryption
LIBRARY
libcrypto, -lcrypto
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 parame-
ter 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_DecryptFi-
nal() 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.
2001-04-12 0.9.6g 1
EVP_OpenInit(3) OpenSSL EVP_OpenInit(3)
SEE ALSO
openssl_evp(3), openssl_rand(3), EVP_EncryptInit(3),
EVP_SealInit(3)
HISTORY
2001-04-12 0.9.6g 2
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