BIO_f_cipher man page on DragonFly

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BIO_F_CIPHER(3)		 BSD Library Functions Manual	       BIO_F_CIPHER(3)

     BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx —
     cipher BIO filter

     #include <openssl/bio.h>
     #include <openssl/evp.h>


     BIO_set_cipher(BIO *b, const EVP_CIPHER *cipher, unsigned char *key,
	 unsigned char *iv, int enc);

     BIO_get_cipher_status(BIO *b);

     BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx);

     BIO_f_cipher() returns the cipher BIO method.  This is a filter BIO that
     encrypts any data written through it, and decrypts any data read from it.
     It is a BIO wrapper for the cipher routines EVP_CipherInit(3),
     EVP_CipherUpdate(3), and EVP_CipherFinal(3).

     Cipher BIOs do not support BIO_gets(3) or BIO_puts(3).

     BIO_flush(3) on an encryption BIO that is being written through is used
     to signal that no more data is to be encrypted: this is used to flush and
     possibly pad the final block through the BIO.

     BIO_set_cipher() sets the cipher of BIO b to cipher using key key and IV
     iv.  enc should be set to 1 for encryption and zero for decryption.

     When reading from an encryption BIO, the final block is automatically
     decrypted and checked when EOF is detected.  BIO_get_cipher_status() is a
     BIO_ctrl(3) macro which can be called to determine whether the decryption
     operation was successful.

     BIO_get_cipher_ctx() is a BIO_ctrl(3) macro which retrieves the internal
     BIO cipher context.  The retrieved context can be used in conjunction
     with the standard cipher routines to set it up.  This is useful when
     BIO_set_cipher() is not flexible enough for the applications needs.

     When encrypting, BIO_flush(3) must be called to flush the final block
     through the BIO.  If it is not, then the final block will fail a subse‐
     quent decrypt.

     When decrypting, an error on the final block is signalled by a zero
     return value from the read operation.  A successful decrypt followed by
     EOF will also return zero for the final read.  BIO_get_cipher_status()
     should be called to determine if the decrypt was successful.

     As always, if BIO_gets(3) or BIO_puts(3) support is needed, then it can
     be achieved by preceding the cipher BIO with a buffering BIO.

     BIO_f_cipher() returns the cipher BIO method.

     BIO_set_cipher() does not return a value.

     BIO_get_cipher_status() returns 1 for a successful decrypt and 0 for

     BIO_get_cipher_ctx() currently always returns 1.

BSD				 July 17, 2014				   BSD

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