51 lines
1.5 KiB
Text
51 lines
1.5 KiB
Text
=pod
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=head1 NAME
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EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
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int ekl,unsigned char *iv,EVP_PKEY *priv);
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void EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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int *outl, unsigned char *in, int inl);
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void EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
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int *outl);
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=head1 DESCRIPTION
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The EVP envelope routines are a high level interface to envelope
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decryption. They decrypt a public key encrypted symmetric key and
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then decrypt data using it.
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EVP_OpenInit() initialises a cipher context B<ctx> for decryption
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with cipher B<type>. It decrypts the encrypted symmetric key of length
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B<ekl> bytes passed in the B<ek> parameter using the private key B<priv>.
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The IV is supplied in the B<iv> parameter.
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EVP_OpenUpdate() and EVP_OpenFinal() have exactly the same properties
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as the EVP_DecryptUpdate() and EVP_DecryptFinal() routines, as
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documented on the L<EVP_EncryptInit(3)|EVP_EncryptInit(3)> manual
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page.
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=head1 RETURN VALUES
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EVP_OpenInit() returns -1 on error or an non zero integer (actually the
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recovered secret key size) if successful.
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EVP_SealUpdate() does not return a value.
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EVP_SealFinal() returns 0 if the decrypt failed or 1 for success.
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=head1 SEE ALSO
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L<evp(3)|evp(3)>,L<rand(3)|rand(3)>
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L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>,
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L<EVP_SealInit(3)|EVP_SealInit(3)>
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=head1 HISTORY
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=cut
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