| 1 | /*************************************************************************** |
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| 2 | * Copyright (c) 2006-2008, Broadcom Corporation |
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| 3 | * All Rights Reserved |
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| 4 | * Confidential Property of Broadcom Corporation |
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| 5 | * |
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| 6 | * THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE |
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| 7 | * AGREEMENT BETWEEN THE USER AND BROADCOM. YOU HAVE NO RIGHT TO USE OR |
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| 8 | * EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT. |
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| 9 | * |
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| 10 | * $brcm_Workfile: bbase64.c $ |
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| 11 | * $brcm_Revision: 4 $ |
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| 12 | * $brcm_Date: 4/7/08 7:33p $ |
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| 13 | * |
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| 14 | * Module Description: |
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| 15 | * |
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| 16 | * BASE64 encoder/decoder |
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| 17 | * |
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| 18 | * Revision History: |
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| 19 | * |
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| 20 | * $brcm_Log: /BSEAV/lib/utils/bbase64.c $ |
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| 21 | * |
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| 22 | * 4 4/7/08 7:33p vsilyaev |
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| 23 | * PR 23826: Fixed typo in bbase64_encode |
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| 24 | * |
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| 25 | * 3 4/7/08 10:55a vsilyaev |
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| 26 | * PR 23826: Fixed typo in termination code for bbase64_encode |
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| 27 | * |
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| 28 | * 2 4/7/08 10:47a vsilyaev |
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| 29 | * PR 23826: Fixed typo in termination code for bbase64_encode |
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| 30 | * |
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| 31 | * 1 8/22/06 4:40p vsilyaev |
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| 32 | * PR 23826: base64 encoder and decoder |
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| 33 | * |
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| 34 | *******************************************************************************/ |
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| 35 | #include "bstd.h" |
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| 36 | #include "bbase64.h" |
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| 37 | |
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| 38 | BDBG_MODULE(bbase64); |
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| 39 | |
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| 40 | static const char b_base64_set[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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| 41 | |
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| 42 | int |
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| 43 | bbase64_encode(const uint8_t *src, size_t src_len, char *dest, size_t dst_len) |
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| 44 | { |
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| 45 | size_t src_off; |
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| 46 | size_t dst_off; |
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| 47 | unsigned acc; |
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| 48 | |
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| 49 | for(src_off=dst_off=0;(src_off+3)<=src_len && (dst_off+4)<=dst_len; src_off+=3,dst_off+=4) { |
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| 50 | acc = (((unsigned)src[src_off+0])<<16) | (((unsigned)src[src_off+1])<<8) | src[src_off+2]; |
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| 51 | dest[dst_off+0] = b_base64_set[(acc>>(24-6))&0x3F]; |
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| 52 | dest[dst_off+1] = b_base64_set[(acc>>(24-12))&0x3F]; |
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| 53 | dest[dst_off+2] = b_base64_set[(acc>>(24-18))&0x3F]; |
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| 54 | dest[dst_off+3] = b_base64_set[acc&0x3F]; |
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| 55 | } |
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| 56 | switch(src_len - src_off) { |
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| 57 | default: |
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| 58 | return -1; |
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| 59 | case 0: |
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| 60 | return (int)dst_off; |
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| 61 | case 1: |
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| 62 | if ((dst_off+4)>dst_len) { |
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| 63 | return -1; |
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| 64 | } |
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| 65 | acc = (((unsigned)src[src_off+0])<<16); |
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| 66 | dest[dst_off+0] = b_base64_set[(acc>>(24-6))&0x3F]; |
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| 67 | dest[dst_off+1] = b_base64_set[(acc>>(24-12))&0x3F]; |
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| 68 | dest[dst_off+2] = '='; |
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| 69 | dest[dst_off+3] = '='; |
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| 70 | dst_off+=4; |
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| 71 | break; |
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| 72 | case 2: |
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| 73 | if ((dst_off+4)>dst_len) { |
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| 74 | return -1; |
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| 75 | } |
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| 76 | acc = (((unsigned)src[src_off+0])<<16) | (((unsigned)src[src_off+1])<<8); |
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| 77 | dest[dst_off+0] = b_base64_set[(acc>>(24-6))&0x3F]; |
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| 78 | dest[dst_off+1] = b_base64_set[(acc>>(24-12))&0x3F]; |
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| 79 | dest[dst_off+2] = b_base64_set[(acc>>(24-18))&0x3F]; |
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| 80 | dest[dst_off+3] = '='; |
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| 81 | dst_off+=4; |
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| 82 | break; |
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| 83 | } |
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| 84 | return (int)dst_off; |
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| 85 | } |
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| 86 | |
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| 87 | static int |
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| 88 | bbase64_decode_unit(char ch) |
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| 89 | { |
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| 90 | int index; |
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| 91 | |
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| 92 | if (ch >= 'A' && ch <= 'Z') { |
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| 93 | index = ch - 'A'; |
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| 94 | } else if (ch >= 'a' && ch <= 'z') { |
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| 95 | index = 26+(ch - 'a'); |
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| 96 | } else if (ch >= '0' && ch <= '9') { |
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| 97 | index = 52+(ch - '0'); |
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| 98 | } else if (ch=='+') { |
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| 99 | index = 62; |
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| 100 | } else if (ch=='/') { |
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| 101 | index = 63; |
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| 102 | } else if (ch=='=') { |
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| 103 | return 0; |
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| 104 | } else { |
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| 105 | return -1; |
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| 106 | } |
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| 107 | BDBG_MSG(("%c -> %d", ch, index)); |
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| 108 | BDBG_ASSERT(b_base64_set[index]==ch); |
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| 109 | return index; |
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| 110 | } |
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| 111 | |
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| 112 | int |
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| 113 | bbase64_decode(const char *src, size_t src_len, uint8_t *dest, size_t dst_len) |
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| 114 | { |
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| 115 | size_t src_off; |
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| 116 | size_t dst_off; |
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| 117 | unsigned acc; |
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| 118 | |
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| 119 | for(src_off=dst_off=0;(src_off+4)<=src_len && (dst_off+3)<=dst_len; src_off+=4,dst_off+=3) { |
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| 120 | int index0,index1,index2,index3; |
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| 121 | if (src[src_off+0]=='=' || src[src_off+1]=='=') { |
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| 122 | return -1; |
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| 123 | } |
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| 124 | index0 = bbase64_decode_unit(src[src_off+0]); |
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| 125 | index1 = bbase64_decode_unit(src[src_off+1]); |
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| 126 | index2 = bbase64_decode_unit(src[src_off+2]); |
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| 127 | index3 = bbase64_decode_unit(src[src_off+3]); |
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| 128 | if(index0<0 || index1<0 || index2<0 || index3<0) { |
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| 129 | return -1; |
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| 130 | } |
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| 131 | acc = (index0 <<(3*6)) | (index1 <<(2*6)) | (index2 <<(1*6)) | index3; |
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| 132 | BDBG_MSG(("%#x", acc)); |
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| 133 | dest[dst_off+0] = acc>>16; |
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| 134 | if(src[src_off+2]=='=') { |
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| 135 | return dst_off+1; |
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| 136 | } |
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| 137 | dest[dst_off+1] = (acc>>8); |
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| 138 | if(src[src_off+3]=='=') { |
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| 139 | return dst_off+2; |
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| 140 | } |
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| 141 | dest[dst_off+2] = acc; |
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| 142 | } |
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| 143 | return dst_off; |
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| 144 | } |
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| 145 | |
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