Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)

Standard preamble:
========================================================================
..

..

.. Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.

If the F register is turned on, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.

Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================

Title "BIO_f_cipher 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx - cipher BIO filter Header "SYNOPSIS" .Vb 2 #include <openssl/bio.h> #include <openssl/evp.h> \& 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 Header "DESCRIPTION" \fIBIO_f_cipher() 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(), EVP_CipherUpdate() and EVP_CipherFinal().

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

\fIBIO_flush() 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

\fIBIO_set_cipher() sets the cipher of \s-1BIO \s0b to cipher using key key and \s-1IV \s0iv. enc should be set to 1 for encryption and zero for decryption.

When reading from an encryption \s-1BIO\s0 the final block is automatically decrypted and checked when \s-1EOF\s0 is detected. BIO_get_cipher_status() is a BIO_ctrl() macro which can be called to determine whether the decryption operation was successful.

\fIBIO_get_cipher_ctx() is a BIO_ctrl() 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() is not flexible enough for the applications needs.

Header "NOTES" When encrypting BIO_flush() must 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.

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. BIO_get_cipher_status() should be called to determine if the decrypt was successful.

As always, if BIO_gets() or BIO_puts() support is needed then it can be achieved by preceding the cipher \s-1BIO\s0 with a buffering \s-1BIO.\s0

Header "RETURN VALUES" \fIBIO_f_cipher() returns the cipher \s-1BIO\s0 method.

\fIBIO_set_cipher() does not return a value.

\fIBIO_get_cipher_status() returns 1 for a successful decrypt and 0 for failure.

\fIBIO_get_cipher_ctx() currently always returns 1.

Header "EXAMPLES" \s-1TBA\s0 Header "SEE ALSO" \s-1TBA\s0