1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomCrypt is a library that provides various cryptographic 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * algorithms in a highly modular and flexible manner. 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "tomcrypt.h" 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @file base64_encode.c 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project Compliant base64 encoder donated by Wayne Scott (wscott@bitmover.com) 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BASE64 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstatic const char *codes = 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project base64 Encode a buffer (NUL terminated) 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param in The input buffer to encode 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param inlen The length of the input buffer 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param out [out] The destination of the base64 encoded data 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param outlen [in/out] The max size and resulting size 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @return CRYPT_OK if successful 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint base64_encode(const unsigned char *in, unsigned long inlen, 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned char *out, unsigned long *outlen) 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned long i, len2, leven; 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned char *p; 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(in != NULL); 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(out != NULL); 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(outlen != NULL); 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* valid output size ? */ 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project len2 = 4 * ((inlen + 2) / 3); 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (*outlen < len2 + 1) { 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *outlen = len2 + 1; 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_BUFFER_OVERFLOW; 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project p = out; 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project leven = 3*(inlen / 3); 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (i = 0; i < leven; i += 3) { 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[(in[0] >> 2) & 0x3F]; 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F]; 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F]; 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[in[2] & 0x3F]; 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project in += 3; 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* Pad it if necessary... */ 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (i < inlen) { 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned a = in[0]; 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned b = (i+1 < inlen) ? in[1] : 0; 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[(a >> 2) & 0x3F]; 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F]; 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '='; 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p++ = '='; 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* append a NULL byte */ 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *p = '\0'; 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 71f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* return ok */ 72f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *outlen = p - out; 73f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_OK; 74f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 75f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 76f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 77f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 78f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 79f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtomcrypt/src/misc/base64/base64_encode.c,v $ */ 80f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.5 $ */ 81f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/06/16 21:53:41 $ */ 82