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187
external/boringssl/include/openssl/base64.h
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external/boringssl/include/openssl/base64.h
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#ifndef OPENSSL_HEADER_BASE64_H
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#define OPENSSL_HEADER_BASE64_H
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#include <openssl/base.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* base64 functions.
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*
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* For historical reasons, these functions have the EVP_ prefix but just do
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* base64 encoding and decoding. */
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/* Encoding */
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/* EVP_EncodeBlock encodes |src_len| bytes from |src| and writes the
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* result to |dst| with a trailing NUL. It returns the number of bytes
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* written, not including this trailing NUL. */
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OPENSSL_EXPORT size_t EVP_EncodeBlock(uint8_t *dst, const uint8_t *src,
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size_t src_len);
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/* EVP_EncodedLength sets |*out_len| to the number of bytes that will be needed
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* to call |EVP_EncodeBlock| on an input of length |len|. This includes the
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* final NUL that |EVP_EncodeBlock| writes. It returns one on success or zero
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* on error. */
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OPENSSL_EXPORT int EVP_EncodedLength(size_t *out_len, size_t len);
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/* Decoding */
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/* EVP_DecodedLength sets |*out_len| to the maximum number of bytes that will
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* be needed to call |EVP_DecodeBase64| on an input of length |len|. It returns
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* one on success or zero if |len| is not a valid length for a base64-encoded
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* string. */
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OPENSSL_EXPORT int EVP_DecodedLength(size_t *out_len, size_t len);
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/* EVP_DecodeBase64 decodes |in_len| bytes from base64 and writes
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* |*out_len| bytes to |out|. |max_out| is the size of the output
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* buffer. If it is not enough for the maximum output size, the
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* operation fails. It returns one on success or zero on error. */
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OPENSSL_EXPORT int EVP_DecodeBase64(uint8_t *out, size_t *out_len,
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size_t max_out, const uint8_t *in,
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size_t in_len);
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/* Deprecated functions.
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*
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* OpenSSL provides a streaming base64 implementation, however its behavior is
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* very specific to PEM. It is also very lenient of invalid input. Use of any of
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* these functions is thus deprecated. */
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/* EVP_EncodeInit initialises |*ctx|, which is typically stack
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* allocated, for an encoding operation.
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*
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* NOTE: The encoding operation breaks its output with newlines every
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* 64 characters of output (48 characters of input). Use
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* EVP_EncodeBlock to encode raw base64. */
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OPENSSL_EXPORT void EVP_EncodeInit(EVP_ENCODE_CTX *ctx);
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/* EVP_EncodeUpdate encodes |in_len| bytes from |in| and writes an encoded
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* version of them to |out| and sets |*out_len| to the number of bytes written.
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* Some state may be contained in |ctx| so |EVP_EncodeFinal| must be used to
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* flush it before using the encoded data. */
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OPENSSL_EXPORT void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out,
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int *out_len, const uint8_t *in,
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size_t in_len);
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/* EVP_EncodeFinal flushes any remaining output bytes from |ctx| to |out| and
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* sets |*out_len| to the number of bytes written. */
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OPENSSL_EXPORT void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out,
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int *out_len);
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/* EVP_DecodeInit initialises |*ctx|, which is typically stack allocated, for
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* a decoding operation.
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*
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* TODO(davidben): This isn't a straight-up base64 decode either. Document
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* and/or fix exactly what's going on here; maximum line length and such. */
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OPENSSL_EXPORT void EVP_DecodeInit(EVP_ENCODE_CTX *ctx);
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/* EVP_DecodeUpdate decodes |in_len| bytes from |in| and writes the decoded
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* data to |out| and sets |*out_len| to the number of bytes written. Some state
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* may be contained in |ctx| so |EVP_DecodeFinal| must be used to flush it
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* before using the encoded data.
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*
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* It returns -1 on error, one if a full line of input was processed and zero
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* if the line was short (i.e. it was the last line). */
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OPENSSL_EXPORT int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out,
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int *out_len, const uint8_t *in,
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size_t in_len);
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/* EVP_DecodeFinal flushes any remaining output bytes from |ctx| to |out| and
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* sets |*out_len| to the number of bytes written. It returns one on success
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* and minus one on error. */
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OPENSSL_EXPORT int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out,
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int *out_len);
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/* EVP_DecodeBlock encodes |src_len| bytes from |src| and writes the result to
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* |dst|. It returns the number of bytes written or -1 on error.
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*
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* WARNING: EVP_DecodeBlock's return value does not take padding into
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* account. It also strips leading whitespace and trailing
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* whitespace and minuses. */
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OPENSSL_EXPORT int EVP_DecodeBlock(uint8_t *dst, const uint8_t *src,
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size_t src_len);
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struct evp_encode_ctx_st {
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/* data_used indicates the number of bytes of |data| that are valid. When
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* encoding, |data| will be filled and encoded as a lump. When decoding, only
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* the first four bytes of |data| will be used. */
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unsigned data_used;
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uint8_t data[48];
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/* eof_seen indicates that the end of the base64 data has been seen when
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* decoding. Only whitespace can follow. */
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char eof_seen;
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/* error_encountered indicates that invalid base64 data was found. This will
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* cause all future calls to fail. */
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char error_encountered;
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};
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#endif /* OPENSSL_HEADER_BASE64_H */
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