208 lines
6.6 KiB
Groff
208 lines
6.6 KiB
Groff
.\" $NetBSD: BIO_f_cipher.3,v 1.11 2005/04/24 00:10:03 wiz Exp $
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.\" ========================================================================
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.\"
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.IX Title "BIO_f_cipher 3"
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.TH BIO_f_cipher 3 "2003-07-24" "0.9.7g" "OpenSSL"
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.SH "NAME"
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BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx \- cipher BIO filter
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/bio.h>
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\& #include <openssl/evp.h>
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.Ve
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.PP
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.Vb 5
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\& BIO_METHOD * BIO_f_cipher(void);
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\& void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher,
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\& unsigned char *key, unsigned char *iv, int enc);
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\& int BIO_get_cipher_status(BIO *b)
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\& int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx)
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. This is a filter
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\&\s-1BIO\s0 that encrypts any data written through it, and decrypts any data
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read from it. It is a \s-1BIO\s0 wrapper for the cipher routines
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\&\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR.
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.PP
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Cipher BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
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.PP
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\&\fIBIO_flush()\fR on an encryption \s-1BIO\s0 that is being written through is
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used to signal that no more data is to be encrypted: this is used
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to flush and possibly pad the final block through the \s-1BIO\s0.
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.PP
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\&\fIBIO_set_cipher()\fR sets the cipher of \s-1BIO\s0 \fBb\fR to \fBcipher\fR using key \fBkey\fR
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and \s-1IV\s0 \fBiv\fR. \fBenc\fR should be set to 1 for encryption and zero for
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decryption.
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.PP
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When reading from an encryption \s-1BIO\s0 the final block is automatically
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decrypted and checked when \s-1EOF\s0 is detected. \fIBIO_get_cipher_status()\fR
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is a \fIBIO_ctrl()\fR macro which can be called to determine whether the
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decryption operation was successful.
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.PP
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\&\fIBIO_get_cipher_ctx()\fR is a \fIBIO_ctrl()\fR macro which retrieves the internal
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\&\s-1BIO\s0 cipher context. The retrieved context can be used in conjunction
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with the standard cipher routines to set it up. This is useful when
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\&\fIBIO_set_cipher()\fR is not flexible enough for the applications needs.
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.SH "NOTES"
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.IX Header "NOTES"
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When encrypting \fIBIO_flush()\fR \fBmust\fR be called to flush the final block
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through the \s-1BIO\s0. If it is not then the final block will fail a subsequent
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decrypt.
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.PP
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When decrypting an error on the final block is signalled by a zero
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return value from the read operation. A successful decrypt followed
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by \s-1EOF\s0 will also return zero for the final read. \fIBIO_get_cipher_status()\fR
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should be called to determine if the decrypt was successful.
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.PP
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As always, if \fIBIO_gets()\fR or \fIBIO_puts()\fR support is needed then it can
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be achieved by preceding the cipher \s-1BIO\s0 with a buffering \s-1BIO\s0.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method.
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.PP
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\&\fIBIO_set_cipher()\fR does not return a value.
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.PP
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\&\fIBIO_get_cipher_status()\fR returns 1 for a successful decrypt and 0
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for failure.
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.PP
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\&\fIBIO_get_cipher_ctx()\fR currently always returns 1.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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\&\s-1TBA\s0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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