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EVP_OpenInit(3)
NAME
  EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption

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.

  The EVP_OpenInit() function 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.

  The EVP_OpenUpdate() and EVP_OpenFinal() functions have the same properties
  as the EVP_DecryptUpdate() and EVP_DecryptFinal() functions, as  documented
  on the  EVP_EncryptInit(3) reference 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
  The EVP_OpenInit() function returns 0 on error or a nonzero integer
  (actually the recovered secret key size) if successful.

  The EVP_OpenUpdate() function returns 1 for success or 0 for failure.

  The EVP_OpenFinal() function returns 0 if the decrypt failed or 1 for
  success.

SEE ALSO
  Functions: evp(3), rand_ssl(3), EVP_EncryptInit(3), EVP_SealInit(3)

Index for Section 3

Alphabetical listing for E

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