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1=pod
2
3=head1 NAME
4
5EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption
6
7=head1 SYNOPSIS
8
9 #include <openssl/evp.h>
10
11 int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
12 int ekl,unsigned char *iv,EVP_PKEY *priv);
13 void EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
14 int *outl, unsigned char *in, int inl);
15 void EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
16 int *outl);
17
18=head1 DESCRIPTION
19
20The EVP envelope routines are a high level interface to envelope
21decryption. They decrypt a public key encrypted symmetric key and
22then decrypt data using it.
23
24EVP_OpenInit() initialises a cipher context B<ctx> for decryption
25with cipher B<type>. It decrypts the encrypted symmetric key of length
26B<ekl> bytes passed in the B<ek> parameter using the private key B<priv>.
27The IV is supplied in the B<iv> parameter.
28
29EVP_OpenUpdate() and EVP_OpenFinal() have exactly the same properties
30as the EVP_DecryptUpdate() and EVP_DecryptFinal() routines, as
31documented on the L<EVP_EncryptInit(3)|EVP_EncryptInit(3)> manual
32page.
33
34=head1 RETURN VALUES
35
36EVP_OpenInit() returns -1 on error or an non zero integer (actually the
37recovered secret key size) if successful.
38
39EVP_SealUpdate() does not return a value.
40
41EVP_SealFinal() returns 0 if the decrypt failed or 1 for success.
42
43=head1 SEE ALSO
44
45L<evp(3)|evp(3)>,
46L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>,
47L<EVP_SealInit(3)|EVP_SealInit(3)>
48
49=head1 HISTORY
50
51=cut