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-.\" $OpenBSD: EVP_EncodeInit.3,v 1.7 2019/06/06 01:06:58 schwarze Exp $
-.\" full merge up to: OpenSSL f430ba31 Jun 19 19:39:01 2016 +0200
-.\" selective merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
-.\"
-.\" This file was written by Matt Caswell <matt@openssl.org>.
-.\" Copyright (c) 2016 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: June 6 2019 $
-.Dt EVP_ENCODEINIT 3
-.Os
-.Sh NAME
-.Nm EVP_ENCODE_CTX_new ,
-.Nm EVP_ENCODE_CTX_free ,
-.Nm EVP_EncodeInit ,
-.Nm EVP_EncodeUpdate ,
-.Nm EVP_EncodeFinal ,
-.Nm EVP_EncodeBlock ,
-.Nm EVP_DecodeInit ,
-.Nm EVP_DecodeUpdate ,
-.Nm EVP_DecodeFinal ,
-.Nm EVP_DecodeBlock
-.Nd EVP base64 encode/decode routines
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft EVP_ENCODE_CTX *
-.Fn EVP_ENCODE_CTX_new void
-.Ft void
-.Fo EVP_ENCODE_CTX_free
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fc
-.Ft void
-.Fo EVP_EncodeInit
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_EncodeUpdate
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fa "const unsigned char *in"
-.Fa "int inl"
-.Fc
-.Ft void
-.Fo EVP_EncodeFinal
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fc
-.Ft int
-.Fo EVP_EncodeBlock
-.Fa "unsigned char *t"
-.Fa "const unsigned char *f"
-.Fa "int n"
-.Fc
-.Ft void
-.Fo EVP_DecodeInit
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_DecodeUpdate
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fa "const unsigned char *in"
-.Fa "int inl"
-.Fc
-.Ft int
-.Fo EVP_DecodeFinal
-.Fa "EVP_ENCODE_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fc
-.Ft int
-.Fo EVP_DecodeBlock
-.Fa "unsigned char *t"
-.Fa "const unsigned char *f"
-.Fa "int n"
-.Fc
-.Sh DESCRIPTION
-The EVP encode routines provide a high level interface to base64
-encoding and decoding.
-Base64 encoding converts binary data into a printable form that uses
-the characters A-Z, a-z, 0-9, "+" and "/" to represent the data.
-For every 3 bytes of binary data provided, 4 bytes of base64-encoded
-data will be produced, plus some occasional newlines.
-If the input data length is not a multiple of 3, then the output data
-will be padded at the end using the "=" character.
-.Pp
-.Fn EVP_ENCODE_CTX_new
-allocates, initializes and returns a context to be used for the encode
-and decode functions.
-.Pp
-.Fn EVP_ENCODE_CTX_free
-frees
-.Fa ctx .
-.Pp
-Encoding of binary data is performed in blocks of 48 input bytes (or
-less for the final block).
-For each 48-byte input block encoded, 64 bytes of base64 data is output,
-plus an additional newline character, i.e. 65 bytes in total.
-The final block, which may be less than 48 bytes, will output 4 bytes
-for every 3 bytes of input.
-If the data length is not divisible by 3, then a full 4 bytes is still
-output for the final 1 or 2 bytes of input.
-Similarly a newline character will also be output.
-.Pp
-.Fn EVP_EncodeInit
-initialises
-.Fa ctx
-for the start of a new encoding operation.
-.Pp
-.Fn EVP_EncodeUpdate
-encodes
-.Fa inl
-bytes of data found in the buffer pointed to by
-.Fa in .
-The output is stored in the buffer
-.Fa out
-and the number of bytes output is stored in
-.Pf * Fa outl .
-It is the caller's responsibility to ensure that the buffer at
-.Fa out
-is sufficiently large to accommodate the output data.
-Only full blocks of data (48 bytes) will be immediately processed and
-output by this function.
-Any remainder is held in the
-.Fa ctx
-object and will be processed by a subsequent call to
-.Fn EVP_EncodeUpdate
-or
-.Fn EVP_EncodeFinal .
-To calculate the required size of the output buffer, add together the
-value of
-.Fa inl
-with the amount of unprocessed data held in
-.Fa ctx
-and divide the result by 48 (ignore any remainder).
-This gives the number of blocks of data that will be processed.
-Ensure the output buffer contains 65 bytes of storage for each block,
-plus an additional byte for a NUL terminator.
-.Fn EVP_EncodeUpdate
-may be called repeatedly to process large amounts of input data.
-In the event of an error ,
-.Fn EVP_EncodeUpdate
-will set
-.Pf * Fa outl
-to 0 and return 0.
-On success 1 will be returned.
-.Pp
-.Fn EVP_EncodeFinal
-must be called at the end of an encoding operation.
-It will process any partial block of data remaining in the
-.Fa ctx
-object.
-The output data will be stored in
-.Fa out
-and the length of the data written will be stored in
-.Pf * Fa outl .
-It is the caller's responsibility to ensure that
-.Fa out
-is sufficiently large to accommodate the output data, which will
-never be more than 65 bytes plus an additional NUL terminator, i.e.
-66 bytes in total.
-.Pp
-.Fn EVP_EncodeBlock
-encodes a full block of input data in
-.Fa f
-and of length
-.Fa n
-and stores it in
-.Fa t .
-For every 3 bytes of input provided, 4 bytes of output data will be
-produced.
-If
-.Sy n
-is not divisible by 3, then the block is encoded as a final block
-of data and the output is padded such that it is always divisible
-by 4.
-Additionally a NUL terminator character will be added.
-For example, if 16 bytes of input data are provided, then 24 bytes
-of encoded data is created plus 1 byte for a NUL terminator,
-i.e. 25 bytes in total.
-The length of the data generated
-.Em without
-the NUL terminator is returned from the function.
-.Pp
-.Fn EVP_DecodeInit
-initialises
-.Fa ctx
-for the start of a new decoding operation.
-.Pp
-.Fn EVP_DecodeUpdate
-decodes
-.Fa inl
-characters of data found in the buffer pointed to by
-.Fa in .
-The output is stored in the buffer
-.Fa out
-and the number of bytes output is stored in
-.Pf * Fa outl .
-It is the caller's responsibility to ensure that the buffer at
-.Fa out
-is sufficiently large to accommodate the output data.
-This function will attempt to decode as much data as possible in 4-byte
-chunks.
-Any whitespace, newline or carriage return characters are ignored.
-Any partial chunk of unprocessed data (1, 2 or 3 bytes) that remains at
-the end will be held in the
-.Fa ctx
-object and processed by a subsequent call to
-.Fn EVP_DecodeUpdate .
-If any illegal base64 characters are encountered or if the base64
-padding character "=" is encountered in the middle of the data,
-then the function returns -1 to indicate an error.
-A return value of 0 or 1 indicates successful processing of the data.
-A return value of 0 additionally indicates that the last input data
-characters processed included the base64 padding character "=" and
-therefore no more non-padding character data is expected to be
-processed.
-For every 4 valid base64 bytes processed \(em ignoring whitespace,
-carriage returns and line feeds \(em 3 bytes of binary output data
-will be produced, or less at the end of the data where the padding
-character "=" has been used.
-.Pp
-.Fn EVP_DecodeFinal
-must be called at the end of a decoding operation.
-If there is any unprocessed data still in
-.Fa ctx ,
-then the input data must not have been a multiple of 4 and therefore an
-error has occurred.
-The function will return -1 in this case.
-Otherwise the function returns 1 on success.
-.Pp
-.Fn EVP_DecodeBlock
-will decode the block of
-.Fa n
-characters of base64 data contained in
-.Fa f
-and store the result in
-.Fa t .
-Any leading whitespace will be trimmed as will any trailing whitespace,
-newlines, carriage returns or EOF characters.
-After such trimming the length of the data in
-.Fa f
-must be divisible by 4.
-For every 4 input bytes, exactly 3 output bytes will be produced.
-The output will be padded with 0 bits if necessary to ensure that the
-output is always 3 bytes for every 4 input bytes.
-This function will return the length of the data decoded or -1 on error.
-.Sh RETURN VALUES
-.Fn EVP_ENCODE_CTX_new
-returns a pointer to the newly allocated
-.Vt EVP_ENCODE_CTX
-object or
-.Dv NULL
-on error.
-.Pp
-.Fn EVP_EncodeUpdate
-returns 0 on error or 1 on success.
-.Pp
-.Fn EVP_EncodeBlock
-returns the number of bytes encoded excluding the NUL terminator.
-.Pp
-.Fn EVP_DecodeUpdate
-returns -1 on error and 0 or 1 on success.
-If 0 is returned, then no more non-padding base64 characters are
-expected.
-.Pp
-.Fn EVP_DecodeFinal
-returns -1 on error or 1 on success.
-.Pp
-.Fn EVP_DecodeBlock
-returns the length of the data decoded or -1 on error.
-.Sh SEE ALSO
-.Xr BIO_f_base64 3 ,
-.Xr evp 3
-.Sh HISTORY
-The
-.Fn EVP_Encode*
-and
-.Fn EVP_Decode*
-functions first appeared in SSLeay 0.5.1
-and have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_ENCODE_CTX_new
-and
-.Fn EVP_ENCODE_CTX_free
-first appeared in OpenSSL 1.1.0 and have been available since
-.Ox 6.5 .