Manual Pages for UNIX Operating System command usage for man EVP_OpenUpdate

OpenSSL                                    EVP_OpenInit(3openssl)



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     EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope
     decryption

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      #include 

      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);


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     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 ccccttttxxxx for
     decryption with cipher ttttyyyyppppeeee. It decrypts the encrypted
     symmetric key of length eeeekkkkllll bytes passed in the eeeekkkk parameter
     using the private key pppprrrriiiivvvv.  The IV is supplied in the iiiivvvv
     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.

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     It is possible to call EVP_OpenInit() twice in the same way
     as EVP_DecryptInit(). The first call should have pppprrrriiiivvvv set to
     NULL and (after setting any cipher parameters) it should be
     called again with ttttyyyyppppeeee set to NULL.

     If the cipher passed in the ttttyyyyppppeeee 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.

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     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.




23/Sep/2000            Last change: 0.9.8o                      1






OpenSSL                                    EVP_OpenInit(3openssl)



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

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23/Sep/2000            Last change: 0.9.8o                      2