1EVP_OPENINIT(3) OpenSSL EVP_OPENINIT(3)
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6 EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption
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9 #include <openssl/evp.h>
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11 int EVP_OpenInit(EVP_CIPHER_CTX *ctx, EVP_CIPHER *type, unsigned char *ek,
12 int ekl, unsigned char *iv, EVP_PKEY *priv);
13 int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
14 int *outl, unsigned char *in, int inl);
15 int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl);
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18 The EVP envelope routines are a high level interface to envelope
19 decryption. They decrypt a public key encrypted symmetric key and then
20 decrypt data using it.
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22 EVP_OpenInit() initializes a cipher context ctx for decryption with
23 cipher type. It decrypts the encrypted symmetric key of length ekl
24 bytes passed in the ek parameter using the private key priv. The IV is
25 supplied in the iv parameter.
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27 EVP_OpenUpdate() and EVP_OpenFinal() have exactly the same properties
28 as the EVP_DecryptUpdate() and EVP_DecryptFinal() routines, as
29 documented on the EVP_EncryptInit(3) manual page.
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32 It is possible to call EVP_OpenInit() twice in the same way as
33 EVP_DecryptInit(). The first call should have priv set to NULL and
34 (after setting any cipher parameters) it should be called again with
35 type set to NULL.
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37 If the cipher passed in the type parameter is a variable length cipher
38 then the key length will be set to the value of the recovered key
39 length. If the cipher is a fixed length cipher then the recovered key
40 length must match the fixed cipher length.
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43 EVP_OpenInit() returns 0 on error or a non zero integer (actually the
44 recovered secret key size) if successful.
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46 EVP_OpenUpdate() returns 1 for success or 0 for failure.
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48 EVP_OpenFinal() returns 0 if the decrypt failed or 1 for success.
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51 evp(7), RAND_bytes(3), EVP_EncryptInit(3), EVP_SealInit(3)
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54 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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56 Licensed under the OpenSSL license (the "License"). You may not use
57 this file except in compliance with the License. You can obtain a copy
58 in the file LICENSE in the source distribution or at
59 <https://www.openssl.org/source/license.html>.
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631.1.1c 2019-05-28 EVP_OPENINIT(3)