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    Command:

    EVP_OpenInit

    
    
    

    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() and EVP_DecryptFinal() 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.
    
    
    

    SEE ALSO

           evp(3), rand(3), EVP_EncryptInit(3), EVP_SealInit(3)
    
    
    

    HISTORY

    
    

    1.0.1e 2013-02-11 EVP_OpenInit(3)

    
    
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