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-.\" ======================================================================
-.\"
-.IX Title "BIO_f_cipher 3"
-.TH BIO_f_cipher 3 "0.9.7a" "2003-02-19" "OpenSSL"
-.UC
-.SH "NAME"
-BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx \- cipher \s-1BIO\s0 filter
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 2
-\& #include <openssl/bio.h>
-\& #include <openssl/evp.h>
-.Ve
-.Vb 5
-\& BIO_METHOD *   BIO_f_cipher(void);
-\& void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher,
-\&                unsigned char *key, unsigned char *iv, int enc);
-\& int BIO_get_cipher_status(BIO *b)
-\& int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx)
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. This is a filter
-\&\s-1BIO\s0 that encrypts any data written through it, and decrypts any data
-read from it. It is a \s-1BIO\s0 wrapper for the cipher routines
-\&\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR.
-.PP
-Cipher BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR. 
-.PP
-\&\fIBIO_flush()\fR on an encryption \s-1BIO\s0 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 \s-1BIO\s0.
-.PP
-\&\fIBIO_set_cipher()\fR sets the cipher of \s-1BIO\s0 <b> to \fBcipher\fR using key \fBkey\fR
-and \s-1IV\s0 \fBiv\fR. \fBenc\fR should be set to 1 for encryption and zero for
-decryption.
-.PP
-When reading from an encryption \s-1BIO\s0 the final block is automatically
-decrypted and checked when \s-1EOF\s0 is detected. \fIBIO_get_cipher_status()\fR
-is a \fIBIO_ctrl()\fR macro which can be called to determine whether the
-decryption operation was successful.
-.PP
-\&\fIBIO_get_cipher_ctx()\fR is a \fIBIO_ctrl()\fR macro which retrieves the internal
-\&\s-1BIO\s0 cipher context. The retrieved context can be used in conjunction
-with the standard cipher routines to set it up. This is useful when
-\&\fIBIO_set_cipher()\fR is not flexible enough for the applications needs.
-.SH "NOTES"
-.IX Header "NOTES"
-When encrypting \fIBIO_flush()\fR \fBmust\fR be called to flush the final block
-through the \s-1BIO\s0. If it is not then the final block will fail a subsequent
-decrypt.
-.PP
-When decrypting an error on the final block is signalled by a zero
-return value from the read operation. A successful decrypt followed
-by \s-1EOF\s0 will also return zero for the final read. \fIBIO_get_cipher_status()\fR
-should be called to determine if the decrypt was successful.
-.PP
-As always, if \fIBIO_gets()\fR or \fIBIO_puts()\fR support is needed then it can
-be achieved by preceding the cipher \s-1BIO\s0 with a buffering \s-1BIO\s0.
-.SH "RETURN VALUES"
-.IX Header "RETURN VALUES"
-\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method.
-.PP
-\&\fIBIO_set_cipher()\fR does not return a value.
-.PP
-\&\fIBIO_get_cipher_status()\fR returns 1 for a successful decrypt and 0
-for failure.
-.PP
-\&\fIBIO_get_cipher_ctx()\fR currently always returns 1.
-.SH "EXAMPLES"
-.IX Header "EXAMPLES"
-\&\s-1TBA\s0
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-\&\s-1TBA\s0