1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay@cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay@cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #ifndef OPENSSL_HEADER_BASE64_H 58 #define OPENSSL_HEADER_BASE64_H 59 60 #include <openssl/base.h> 61 62 #if defined(__cplusplus) 63 extern "C" { 64 #endif 65 66 67 /* base64 functions. 68 * 69 * For historical reasons, these functions have the EVP_ prefix but just do 70 * base64 encoding and decoding. */ 71 72 73 /* Encoding */ 74 75 /* EVP_EncodeBlock encodes |src_len| bytes from |src| and writes the 76 * result to |dst| with a trailing NUL. It returns the number of bytes 77 * written, not including this trailing NUL. */ 78 OPENSSL_EXPORT size_t EVP_EncodeBlock(uint8_t *dst, const uint8_t *src, 79 size_t src_len); 80 81 /* EVP_EncodedLength sets |*out_len| to the number of bytes that will be needed 82 * to call |EVP_EncodeBlock| on an input of length |len|. This includes the 83 * final NUL that |EVP_EncodeBlock| writes. It returns one on success or zero 84 * on error. */ 85 OPENSSL_EXPORT int EVP_EncodedLength(size_t *out_len, size_t len); 86 87 88 /* Decoding */ 89 90 /* EVP_DecodedLength sets |*out_len| to the maximum number of bytes that will 91 * be needed to call |EVP_DecodeBase64| on an input of length |len|. It returns 92 * one on success or zero if |len| is not a valid length for a base64-encoded 93 * string. */ 94 OPENSSL_EXPORT int EVP_DecodedLength(size_t *out_len, size_t len); 95 96 /* EVP_DecodeBase64 decodes |in_len| bytes from base64 and writes 97 * |*out_len| bytes to |out|. |max_out| is the size of the output 98 * buffer. If it is not enough for the maximum output size, the 99 * operation fails. It returns one on success or zero on error. */ 100 OPENSSL_EXPORT int EVP_DecodeBase64(uint8_t *out, size_t *out_len, 101 size_t max_out, const uint8_t *in, 102 size_t in_len); 103 104 105 /* Deprecated functions. 106 * 107 * OpenSSL provides a streaming base64 implementation, however its behavior is 108 * very specific to PEM. It is also very lenient of invalid input. Use of any of 109 * these functions is thus deprecated. */ 110 111 /* EVP_EncodeInit initialises |*ctx|, which is typically stack 112 * allocated, for an encoding operation. 113 * 114 * NOTE: The encoding operation breaks its output with newlines every 115 * 64 characters of output (48 characters of input). Use 116 * EVP_EncodeBlock to encode raw base64. */ 117 OPENSSL_EXPORT void EVP_EncodeInit(EVP_ENCODE_CTX *ctx); 118 119 /* EVP_EncodeUpdate encodes |in_len| bytes from |in| and writes an encoded 120 * version of them to |out| and sets |*out_len| to the number of bytes written. 121 * Some state may be contained in |ctx| so |EVP_EncodeFinal| must be used to 122 * flush it before using the encoded data. */ 123 OPENSSL_EXPORT void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out, 124 int *out_len, const uint8_t *in, 125 size_t in_len); 126 127 /* EVP_EncodeFinal flushes any remaining output bytes from |ctx| to |out| and 128 * sets |*out_len| to the number of bytes written. */ 129 OPENSSL_EXPORT void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out, 130 int *out_len); 131 132 /* EVP_DecodeInit initialises |*ctx|, which is typically stack allocated, for 133 * a decoding operation. 134 * 135 * TODO(davidben): This isn't a straight-up base64 decode either. Document 136 * and/or fix exactly what's going on here; maximum line length and such. */ 137 OPENSSL_EXPORT void EVP_DecodeInit(EVP_ENCODE_CTX *ctx); 138 139 /* EVP_DecodeUpdate decodes |in_len| bytes from |in| and writes the decoded 140 * data to |out| and sets |*out_len| to the number of bytes written. Some state 141 * may be contained in |ctx| so |EVP_DecodeFinal| must be used to flush it 142 * before using the encoded data. 143 * 144 * It returns -1 on error, one if a full line of input was processed and zero 145 * if the line was short (i.e. it was the last line). */ 146 OPENSSL_EXPORT int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, uint8_t *out, 147 int *out_len, const uint8_t *in, 148 size_t in_len); 149 150 /* EVP_DecodeFinal flushes any remaining output bytes from |ctx| to |out| and 151 * sets |*out_len| to the number of bytes written. It returns one on success 152 * and minus one on error. */ 153 OPENSSL_EXPORT int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, uint8_t *out, 154 int *out_len); 155 156 /* EVP_DecodeBlock encodes |src_len| bytes from |src| and writes the result to 157 * |dst|. It returns the number of bytes written or -1 on error. 158 * 159 * WARNING: EVP_DecodeBlock's return value does not take padding into 160 * account. It also strips leading whitespace and trailing 161 * whitespace and minuses. */ 162 OPENSSL_EXPORT int EVP_DecodeBlock(uint8_t *dst, const uint8_t *src, 163 size_t src_len); 164 165 166 struct evp_encode_ctx_st { 167 /* data_used indicates the number of bytes of |data| that are valid. When 168 * encoding, |data| will be filled and encoded as a lump. When decoding, only 169 * the first four bytes of |data| will be used. */ 170 unsigned data_used; 171 uint8_t data[48]; 172 173 /* eof_seen indicates that the end of the base64 data has been seen when 174 * decoding. Only whitespace can follow. */ 175 char eof_seen; 176 177 /* error_encountered indicates that invalid base64 data was found. This will 178 * cause all future calls to fail. */ 179 char error_encountered; 180 }; 181 182 183 #if defined(__cplusplus) 184 } /* extern C */ 185 #endif 186 187 #endif /* OPENSSL_HEADER_BASE64_H */ 188