/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * 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 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 acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS 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 AUTHOR OR 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 OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #ifndef OPENSSL_HEADER_BASE64_H #define OPENSSL_HEADER_BASE64_H #include #if defined(__cplusplus) extern "C" { #endif /* base64 functions. * * For historical reasons, these functions have the EVP_ prefix but just do * base64 encoding and decoding. */ typedef struct evp_encode_ctx_st EVP_ENCODE_CTX; /* Encoding */ /* EVP_EncodeInit initialises |*ctx|, which is typically stack * allocated, for an encoding operation. * * NOTE: The encoding operation breaks its output with newlines every * 64 characters of output (48 characters of input). Use * EVP_EncodeBlock to encode raw base64. */ void EVP_EncodeInit(EVP_ENCODE_CTX *ctx); /* EVP_EncodeUpdate encodes |in_len| bytes from |in| and writes an encoded * version of them to |out| and sets |*out_len| to the number of bytes written. * Some state may be contained in |ctx| so |EVP_EncodeFinal| must be used to * flush it before using the encoded data. */ void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out, int *out_len, const uint8_t *in, size_t in_len); /* EVP_EncodeFinal flushes any remaining output bytes from |ctx| to |out| and * sets |*out_len| to the number of bytes written. */ void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out, int *out_len); /* EVP_EncodeBlock encodes |src_len| bytes from |src| and writes the result to * |dst|. It returns the number of bytes written. */ size_t EVP_EncodeBlock(uint8_t *dst, const uint8_t *src, size_t src_len); /* Decoding */ /* EVP_DecodeInit initialises |*ctx|, which is typically stack allocated, for * a decoding operation. * * TODO(davidben): This isn't a straight-up base64 decode either. Document * and/or fix exactly what's going on here; maximum line length and such. */ void EVP_DecodeInit(EVP_ENCODE_CTX *ctx); /* EVP_DecodeUpdate decodes |in_len| bytes from |in| and writes the decoded * data to |out| and sets |*out_len| to the number of bytes written. Some state * may be contained in |ctx| so |EVP_DecodeFinal| must be used to flush it * before using the encoded data. * * It returns -1 on error, one if a full line of input was processed and zero * if the line was short (i.e. it was the last line). */ int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out, int *out_len, const uint8_t *in, size_t in_len); /* EVP_DecodeFinal flushes any remaining output bytes from |ctx| to |out| and * sets |*out_len| to the number of bytes written. It returns one on success * and minus one on error. */ int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out, int *out_len); /* EVP_DecodeBlock encodes |src_len| bytes from |src| and writes the result to * |dst|. It returns the number of bytes written or -1 on error. * * WARNING: EVP_DecodeBlock's return value does not take padding into * account. TODO(davidben): Possible or worth it to fix or add new API? */ ssize_t EVP_DecodeBlock(uint8_t *dst, const uint8_t *src, size_t src_len); struct evp_encode_ctx_st { unsigned num; /* number saved in a partial encode/decode */ unsigned length; /* The length is either the output line length * (in input bytes) or the shortest input line * length that is ok. Once decoding begins, * the length is adjusted up each time a longer * line is decoded */ uint8_t enc_data[80]; /* data to encode */ unsigned line_num; /* number read on current line */ int expect_nl; }; #if defined(__cplusplus) } /* extern C */ #endif #endif /* OPENSSL_HEADER_BASE64_H */