EVP_SealInit man page on Ultrix

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EVP_SealInit(3)			    OpenSSL		       EVP_SealInit(3)

NAME
       EVP_SealInit, EVP_SealUpdate, EVP_SealFinal - EVP envelope encryption

SYNOPSIS
	#include <openssl/evp.h>

	int EVP_SealInit(EVP_CIPHER_CTX *ctx, EVP_CIPHER *type, unsigned char **ek,
		       int *ekl, unsigned char *iv,EVP_PKEY **pubk, int npubk);
	int EVP_SealUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
		int *outl, unsigned char *in, int inl);
	void EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
		int *outl);

DESCRIPTION
       The EVP envelope routines are a high level interface to envelope
       encryption. They generate a random key and then "envelope" it by using
       public key encryption. Data can then be encrypted using this key.

       EVP_SealInit() initializes a cipher context ctx for encryption with
       cipher type using a random secret key and IV supplied in the iv
       parameter. type is normally supplied by a function such as
       EVP_des_cbc(). The secret key is encrypted using one or more public
       keys, this allows the same encrypted data to be decrypted using any of
       the corresponding private keys. ek is an array of buffers where the
       public key encrypted secret key will be written, each buffer must
       contain enough room for the corresponding encrypted key: that is ek[i]
       must have room for EVP_PKEY_size(pubk[i]) bytes. The actual size of
       each encrypted secret key is written to the array ekl. pubk is an array
       of npubk public keys.

       EVP_SealUpdate() and EVP_SealFinal() have exactly the same properties
       as the EVP_EncryptUpdate() and EVP_EncryptFinal() routines, as
       documented on the EVP_EncryptInit(3) manual page.

RETURN VALUES
       EVP_SealInit() returns 0 on error or npubk if successful.

       EVP_SealUpdate() returns 1 for success and 0 for failure.

NOTES
       Because a random secret key is generated the random number generator
       must be seeded before calling EVP_SealInit().

       The public key must be RSA because it is the only OpenSSL public key
       algorithm that supports key transport.

       Envelope encryption is the usual method of using public key encryption
       on large amounts of data, this is because public key encryption is slow
       but symmetric encryption is fast. So symmetric encryption is used for
       bulk encryption and the small random symmetric key used is transferred
       using public key encryption.

       It is possible to call EVP_SealInit() twice in the same way as
       EVP_EncryptInit(). The first call should have npubk set to 0 and (after
       setting any cipher parameters) it should be called again with type set
       to NULL.

SEE ALSO
       evp(3), rand(3), EVP_EncryptInit(3), EVP_OpenInit(3)

HISTORY
3rd Berkeley Distribution	    0.9.6m		       EVP_SealInit(3)
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