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FreeRDP/libfreerdp/crypto/base64.c
akallabeth 503b9f0bb7
[warnings] fix integer narrowing
2024-10-03 21:21:45 +02:00

525 lines
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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Base64 Encoding & Decoding
*
* Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <freerdp/config.h>
#include <winpr/crt.h>
#include <freerdp/crypto/crypto.h>
static const BYTE enc_base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const BYTE enc_base64url[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
static const signed char dec_base64url[] = {
-1, /* 0 000 00 00000000 NUL &#00; Null character */
-1, /* 1 001 01 00000001 SOH &#01; Start of Heading */
-1, /* 2 002 02 00000010 STX &#02; Start of Text */
-1, /* 3 003 03 00000011 ETX &#03; End of Text */
-1, /* 4 004 04 00000100 EOT &#04; End of Transmission */
-1, /* 5 005 05 00000101 ENQ &#05; Enquiry */
-1, /* 6 006 06 00000110 ACK &#06; Acknowledge */
-1, /* 7 007 07 00000111 BEL &#07; Bell, Alert */
-1, /* 8 010 08 00001000 BS &#08; Backspace */
-1, /* 9 011 09 00001001 HT &#09; Horizontal Tab */
-1, /* 10 012 0A 00001010 LF &#10; Line Feed */
-1, /* 11 013 0B 00001011 VT &#11; Vertical Tabulation */
-1, /* 12 014 0C 00001100 FF &#12; Form Feed */
-1, /* 13 015 0D 00001101 CR &#13; Carriage Return */
-1, /* 14 016 0E 00001110 SO &#14; Shift Out */
-1, /* 15 017 0F 00001111 SI &#15; Shift In */
-1, /* 16 020 10 00010000 DLE &#16; Data Link Escape */
-1, /* 17 021 11 00010001 DC1 &#17; Device Control One (XON) */
-1, /* 18 022 12 00010010 DC2 &#18; Device Control Two */
-1, /* 19 023 13 00010011 DC3 &#19; Device Control Three (XOFF) */
-1, /* 20 024 14 00010100 DC4 &#20; Device Control Four */
-1, /* 21 025 15 00010101 NAK &#21; Negative Acknowledge */
-1, /* 22 026 16 00010110 SYN &#22; Synchronous Idle */
-1, /* 23 027 17 00010111 ETB &#23; End of Transmission Block */
-1, /* 24 030 18 00011000 CAN &#24; Cancel */
-1, /* 25 031 19 00011001 EM &#25; End of medium */
-1, /* 26 032 1A 00011010 SUB &#26; Substitute */
-1, /* 27 033 1B 00011011 ESC &#27; Escape */
-1, /* 28 034 1C 00011100 FS &#28; File Separator */
-1, /* 29 035 1D 00011101 GS &#29; Group Separator */
-1, /* 30 036 1E 00011110 RS &#30; Record Separator */
-1, /* 31 037 1F 00011111 US &#31; Unit Separator */
-1, /* 32 040 20 00100000 SP &#32; Space */
-1, /* 33 041 21 00100001 ! &#33; &excl; Exclamation mark */
-1, /* 34 042 22 00100010 " &#34; &quot; Double quotes (or speech marks) */
-1, /* 35 043 23 00100011 # &#35; &num; Number sign */
-1, /* 36 044 24 00100100 $ &#36; &dollar; Dollar */
-1, /* 37 045 25 00100101 % &#37; &percnt; Per cent sign */
-1, /* 38 046 26 00100110 & &#38; &amp; Ampersand */
-1, /* 39 047 27 00100111 ' &#39; &apos; Single quote */
-1, /* 40 050 28 00101000 ( &#40; &lparen; Open parenthesis (or open
* bracket)
*/
-1, /* 41 051 29 00101001 ) &#41; &rparen; Close parenthesis (or close
* bracket)
*/
-1, /* 42 052 2A 00101010 * &#42; &ast; Asterisk */
-1, /* 43 053 2B 00101011 + &#43; &plus; Plus */
-1, /* 44 054 2C 00101100 , &#44; &comma; Comma */
62, /* 45 055 2D 00101101 - &#45; Hyphen-minus */
-1, /* 46 056 2E 00101110 . &#46; &period; Period, dot or full stop */
-1, /* 47 057 2F 00101111 / &#47; &sol; Slash or divide */
52, /* 48 060 30 00110000 0 &#48; Zero */
53, /* 49 061 31 00110001 1 &#49; One */
54, /* 50 062 32 00110010 2 &#50; Two */
55, /* 51 063 33 00110011 3 &#51; Three */
56, /* 52 064 34 00110100 4 &#52; Four */
57, /* 53 065 35 00110101 5 &#53; Five */
58, /* 54 066 36 00110110 6 &#54; Six */
59, /* 55 067 37 00110111 7 &#55; Seven */
60, /* 56 070 38 00111000 8 &#56; Eight */
61, /* 57 071 39 00111001 9 &#57; Nine */
-1, /* 58 072 3A 00111010 : &#58; &colon; Colon */
-1, /* 59 073 3B 00111011 ; &#59; &semi; Semicolon */
-1, /* 60 074 3C 00111100 < &#60; &lt; Less than (or open angled bracket)
*/
-1, /* 61 075 3D 00111101 = &#61; &equals; Equals */
-1, /* 62 076 3E 00111110 > &#62; &gt; Greater than (or close angled
* bracket)
*/
-1, /* 63 077 3F 00111111 ? &#63; &quest; Question mark */
-1, /* 64 100 40 01000000 @ &#64; &commat; At sign */
0, /* 65 101 41 01000001 A &#65; Uppercase A */
1, /* 66 102 42 01000010 B &#66; Uppercase B */
2, /* 67 103 43 01000011 C &#67; Uppercase C */
3, /* 68 104 44 01000100 D &#68; Uppercase D */
4, /* 69 105 45 01000101 E &#69; Uppercase E */
5, /* 70 106 46 01000110 F &#70; Uppercase F */
6, /* 71 107 47 01000111 G &#71; Uppercase G */
7, /* 72 110 48 01001000 H &#72; Uppercase H */
8, /* 73 111 49 01001001 I &#73; Uppercase I */
9, /* 74 112 4A 01001010 J &#74; Uppercase J */
10, /* 75 113 4B 01001011 K &#75; Uppercase K */
11, /* 76 114 4C 01001100 L &#76; Uppercase L */
12, /* 77 115 4D 01001101 M &#77; Uppercase M */
13, /* 78 116 4E 01001110 N &#78; Uppercase N */
14, /* 79 117 4F 01001111 O &#79; Uppercase O */
15, /* 80 120 50 01010000 P &#80; Uppercase P */
16, /* 81 121 51 01010001 Q &#81; Uppercase Q */
17, /* 82 122 52 01010010 R &#82; Uppercase R */
18, /* 83 123 53 01010011 S &#83; Uppercase S */
19, /* 84 124 54 01010100 T &#84; Uppercase T */
20, /* 85 125 55 01010101 U &#85; Uppercase U */
21, /* 86 126 56 01010110 V &#86; Uppercase V */
22, /* 87 127 57 01010111 W &#87; Uppercase W */
23, /* 88 130 58 01011000 X &#88; Uppercase X */
24, /* 89 131 59 01011001 Y &#89; Uppercase Y */
25, /* 90 132 5A 01011010 Z &#90; Uppercase Z */
-1, /* 91 133 5B 01011011 [ &#91; &lsqb; Opening bracket */
-1, /* 92 134 5C 01011100 \ &#92; &bsol; Backslash */
-1, /* 93 135 5D 01011101 ] &#93; &rsqb; Closing bracket */
-1, /* 94 136 5E 01011110 ^ &#94; &Hat; Caret - circumflex */
63, /* 95 137 5F 01011111 _ &#95; &lowbar; Underscore */
-1, /* 96 140 60 01100000 ` &#96; &grave; Grave accent */
26, /* 97 141 61 01100001 a &#97; Lowercase a */
27, /* 98 142 62 01100010 b &#98; Lowercase b */
28, /* 99 143 63 01100011 c &#99; Lowercase c */
29, /* 100 144 64 01100100 d &#100; Lowercase d */
30, /* 101 145 65 01100101 e &#101; Lowercase e */
31, /* 102 146 66 01100110 f &#102; Lowercase f */
32, /* 103 147 67 01100111 g &#103; Lowercase g */
33, /* 104 150 68 01101000 h &#104; Lowercase h */
34, /* 105 151 69 01101001 i &#105; Lowercase i */
35, /* 106 152 6A 01101010 j &#106; Lowercase j */
36, /* 107 153 6B 01101011 k &#107; Lowercase k */
37, /* 108 154 6C 01101100 l &#108; Lowercase l */
38, /* 109 155 6D 01101101 m &#109; Lowercase m */
39, /* 110 156 6E 01101110 n &#110; Lowercase n */
40, /* 111 157 6F 01101111 o &#111; Lowercase o */
41, /* 112 160 70 01110000 p &#112; Lowercase p */
42, /* 113 161 71 01110001 q &#113; Lowercase q */
43, /* 114 162 72 01110010 r &#114; Lowercase r */
44, /* 115 163 73 01110011 s &#115; Lowercase s */
45, /* 116 164 74 01110100 t &#116; Lowercase t */
46, /* 117 165 75 01110101 u &#117; Lowercase u */
47, /* 118 166 76 01110110 v &#118; Lowercase v */
48, /* 119 167 77 01110111 w &#119; Lowercase w */
49, /* 120 170 78 01111000 x &#120; Lowercase x */
50, /* 121 171 79 01111001 y &#121; Lowercase y */
51, /* 122 172 7A 01111010 z &#122; Lowercase z */
-1, /* 123 173 7B 01111011 { &#123; &lcub; Opening brace */
-1, /* 124 174 7C 01111100 | &#124; &verbar; Vertical bar */
-1, /* 125 175 7D 01111101 } &#125; &rcub; Closing brace */
-1, /* 126 176 7E 01111110 ~ &#126; &tilde; Equivalency sign - tilde */
-1, /* 127 177 7F 01111111 DEL &#127; Delete */
};
static const signed char dec_base64[] = {
-1, /* 0 000 00 00000000 NUL &#00; Null character */
-1, /* 1 001 01 00000001 SOH &#01; Start of Heading */
-1, /* 2 002 02 00000010 STX &#02; Start of Text */
-1, /* 3 003 03 00000011 ETX &#03; End of Text */
-1, /* 4 004 04 00000100 EOT &#04; End of Transmission */
-1, /* 5 005 05 00000101 ENQ &#05; Enquiry */
-1, /* 6 006 06 00000110 ACK &#06; Acknowledge */
-1, /* 7 007 07 00000111 BEL &#07; Bell, Alert */
-1, /* 8 010 08 00001000 BS &#08; Backspace */
-1, /* 9 011 09 00001001 HT &#09; Horizontal Tab */
-1, /* 10 012 0A 00001010 LF &#10; Line Feed */
-1, /* 11 013 0B 00001011 VT &#11; Vertical Tabulation */
-1, /* 12 014 0C 00001100 FF &#12; Form Feed */
-1, /* 13 015 0D 00001101 CR &#13; Carriage Return */
-1, /* 14 016 0E 00001110 SO &#14; Shift Out */
-1, /* 15 017 0F 00001111 SI &#15; Shift In */
-1, /* 16 020 10 00010000 DLE &#16; Data Link Escape */
-1, /* 17 021 11 00010001 DC1 &#17; Device Control One (XON) */
-1, /* 18 022 12 00010010 DC2 &#18; Device Control Two */
-1, /* 19 023 13 00010011 DC3 &#19; Device Control Three (XOFF) */
-1, /* 20 024 14 00010100 DC4 &#20; Device Control Four */
-1, /* 21 025 15 00010101 NAK &#21; Negative Acknowledge */
-1, /* 22 026 16 00010110 SYN &#22; Synchronous Idle */
-1, /* 23 027 17 00010111 ETB &#23; End of Transmission Block */
-1, /* 24 030 18 00011000 CAN &#24; Cancel */
-1, /* 25 031 19 00011001 EM &#25; End of medium */
-1, /* 26 032 1A 00011010 SUB &#26; Substitute */
-1, /* 27 033 1B 00011011 ESC &#27; Escape */
-1, /* 28 034 1C 00011100 FS &#28; File Separator */
-1, /* 29 035 1D 00011101 GS &#29; Group Separator */
-1, /* 30 036 1E 00011110 RS &#30; Record Separator */
-1, /* 31 037 1F 00011111 US &#31; Unit Separator */
-1, /* 32 040 20 00100000 SP &#32; Space */
-1, /* 33 041 21 00100001 ! &#33; &excl; Exclamation mark */
-1, /* 34 042 22 00100010 " &#34; &quot; Double quotes (or speech marks) */
-1, /* 35 043 23 00100011 # &#35; &num; Number sign */
-1, /* 36 044 24 00100100 $ &#36; &dollar; Dollar */
-1, /* 37 045 25 00100101 % &#37; &percnt; Per cent sign */
-1, /* 38 046 26 00100110 & &#38; &amp; Ampersand */
-1, /* 39 047 27 00100111 ' &#39; &apos; Single quote */
-1, /* 40 050 28 00101000 ( &#40; &lparen; Open parenthesis (or open
* bracket)
*/
-1, /* 41 051 29 00101001 ) &#41; &rparen; Close parenthesis (or close
* bracket)
*/
-1, /* 42 052 2A 00101010 * &#42; &ast; Asterisk */
62, /* 43 053 2B 00101011 + &#43; &plus; Plus */
-1, /* 44 054 2C 00101100 , &#44; &comma; Comma */
-1, /* 45 055 2D 00101101 - &#45; Hyphen-minus */
-1, /* 46 056 2E 00101110 . &#46; &period; Period, dot or full stop */
63, /* 47 057 2F 00101111 / &#47; &sol; Slash or divide */
52, /* 48 060 30 00110000 0 &#48; Zero */
53, /* 49 061 31 00110001 1 &#49; One */
54, /* 50 062 32 00110010 2 &#50; Two */
55, /* 51 063 33 00110011 3 &#51; Three */
56, /* 52 064 34 00110100 4 &#52; Four */
57, /* 53 065 35 00110101 5 &#53; Five */
58, /* 54 066 36 00110110 6 &#54; Six */
59, /* 55 067 37 00110111 7 &#55; Seven */
60, /* 56 070 38 00111000 8 &#56; Eight */
61, /* 57 071 39 00111001 9 &#57; Nine */
-1, /* 58 072 3A 00111010 : &#58; &colon; Colon */
-1, /* 59 073 3B 00111011 ; &#59; &semi; Semicolon */
-1, /* 60 074 3C 00111100 < &#60; &lt; Less than (or open angled bracket)
*/
-1, /* 61 075 3D 00111101 = &#61; &equals; Equals */
-1, /* 62 076 3E 00111110 > &#62; &gt; Greater than (or close angled
* bracket)
*/
-1, /* 63 077 3F 00111111 ? &#63; &quest; Question mark */
-1, /* 64 100 40 01000000 @ &#64; &commat; At sign */
0, /* 65 101 41 01000001 A &#65; Uppercase A */
1, /* 66 102 42 01000010 B &#66; Uppercase B */
2, /* 67 103 43 01000011 C &#67; Uppercase C */
3, /* 68 104 44 01000100 D &#68; Uppercase D */
4, /* 69 105 45 01000101 E &#69; Uppercase E */
5, /* 70 106 46 01000110 F &#70; Uppercase F */
6, /* 71 107 47 01000111 G &#71; Uppercase G */
7, /* 72 110 48 01001000 H &#72; Uppercase H */
8, /* 73 111 49 01001001 I &#73; Uppercase I */
9, /* 74 112 4A 01001010 J &#74; Uppercase J */
10, /* 75 113 4B 01001011 K &#75; Uppercase K */
11, /* 76 114 4C 01001100 L &#76; Uppercase L */
12, /* 77 115 4D 01001101 M &#77; Uppercase M */
13, /* 78 116 4E 01001110 N &#78; Uppercase N */
14, /* 79 117 4F 01001111 O &#79; Uppercase O */
15, /* 80 120 50 01010000 P &#80; Uppercase P */
16, /* 81 121 51 01010001 Q &#81; Uppercase Q */
17, /* 82 122 52 01010010 R &#82; Uppercase R */
18, /* 83 123 53 01010011 S &#83; Uppercase S */
19, /* 84 124 54 01010100 T &#84; Uppercase T */
20, /* 85 125 55 01010101 U &#85; Uppercase U */
21, /* 86 126 56 01010110 V &#86; Uppercase V */
22, /* 87 127 57 01010111 W &#87; Uppercase W */
23, /* 88 130 58 01011000 X &#88; Uppercase X */
24, /* 89 131 59 01011001 Y &#89; Uppercase Y */
25, /* 90 132 5A 01011010 Z &#90; Uppercase Z */
-1, /* 91 133 5B 01011011 [ &#91; &lsqb; Opening bracket */
-1, /* 92 134 5C 01011100 \ &#92; &bsol; Backslash */
-1, /* 93 135 5D 01011101 ] &#93; &rsqb; Closing bracket */
-1, /* 94 136 5E 01011110 ^ &#94; &Hat; Caret - circumflex */
-1, /* 95 137 5F 01011111 _ &#95; &lowbar; Underscore */
-1, /* 96 140 60 01100000 ` &#96; &grave; Grave accent */
26, /* 97 141 61 01100001 a &#97; Lowercase a */
27, /* 98 142 62 01100010 b &#98; Lowercase b */
28, /* 99 143 63 01100011 c &#99; Lowercase c */
29, /* 100 144 64 01100100 d &#100; Lowercase d */
30, /* 101 145 65 01100101 e &#101; Lowercase e */
31, /* 102 146 66 01100110 f &#102; Lowercase f */
32, /* 103 147 67 01100111 g &#103; Lowercase g */
33, /* 104 150 68 01101000 h &#104; Lowercase h */
34, /* 105 151 69 01101001 i &#105; Lowercase i */
35, /* 106 152 6A 01101010 j &#106; Lowercase j */
36, /* 107 153 6B 01101011 k &#107; Lowercase k */
37, /* 108 154 6C 01101100 l &#108; Lowercase l */
38, /* 109 155 6D 01101101 m &#109; Lowercase m */
39, /* 110 156 6E 01101110 n &#110; Lowercase n */
40, /* 111 157 6F 01101111 o &#111; Lowercase o */
41, /* 112 160 70 01110000 p &#112; Lowercase p */
42, /* 113 161 71 01110001 q &#113; Lowercase q */
43, /* 114 162 72 01110010 r &#114; Lowercase r */
44, /* 115 163 73 01110011 s &#115; Lowercase s */
45, /* 116 164 74 01110100 t &#116; Lowercase t */
46, /* 117 165 75 01110101 u &#117; Lowercase u */
47, /* 118 166 76 01110110 v &#118; Lowercase v */
48, /* 119 167 77 01110111 w &#119; Lowercase w */
49, /* 120 170 78 01111000 x &#120; Lowercase x */
50, /* 121 171 79 01111001 y &#121; Lowercase y */
51, /* 122 172 7A 01111010 z &#122; Lowercase z */
-1, /* 123 173 7B 01111011 { &#123; &lcub; Opening brace */
-1, /* 124 174 7C 01111100 | &#124; &verbar; Vertical bar */
-1, /* 125 175 7D 01111101 } &#125; &rcub; Closing brace */
-1, /* 126 176 7E 01111110 ~ &#126; &tilde; Equivalency sign - tilde */
-1, /* 127 177 7F 01111111 DEL &#127; Delete */
};
static INLINE char* base64_encode_ex(const BYTE* WINPR_RESTRICT alphabet,
const BYTE* WINPR_RESTRICT data, size_t length, BOOL pad,
BOOL crLf, size_t lineSize)
{
int c = 0;
size_t blocks = 0;
size_t outLen = (length + 3) * 4 / 3;
size_t extra = 0;
if (crLf)
{
size_t nCrLf = (outLen + lineSize - 1) / lineSize;
extra = nCrLf * 2;
}
size_t outCounter = 0;
const BYTE* q = data;
BYTE* p = malloc(outLen + extra + 1ull);
if (!p)
return NULL;
char* ret = (char*)p;
/* b1, b2, b3 are input bytes
*
* 0 1 2
* 012345678901234567890123
* | b1 | b2 | b3 |
*
* [ c1 ] [ c3 ]
* [ c2 ] [ c4 ]
*
* c1, c2, c3, c4 are output chars in base64
*/
/* first treat complete blocks */
blocks = length - (length % 3);
for (size_t i = 0; i < blocks; i += 3, q += 3)
{
c = (q[0] << 16) + (q[1] << 8) + q[2];
*p++ = alphabet[(c & 0x00FC0000) >> 18];
*p++ = alphabet[(c & 0x0003F000) >> 12];
*p++ = alphabet[(c & 0x00000FC0) >> 6];
*p++ = alphabet[c & 0x0000003F];
outCounter += 4;
if (crLf && (outCounter % lineSize == 0))
{
*p++ = '\r';
*p++ = '\n';
}
}
/* then remainder */
switch (length % 3)
{
case 0:
break;
case 1:
c = (q[0] << 16);
*p++ = alphabet[(c & 0x00FC0000) >> 18];
*p++ = alphabet[(c & 0x0003F000) >> 12];
if (pad)
{
*p++ = '=';
*p++ = '=';
}
break;
case 2:
c = (q[0] << 16) + (q[1] << 8);
*p++ = alphabet[(c & 0x00FC0000) >> 18];
*p++ = alphabet[(c & 0x0003F000) >> 12];
*p++ = alphabet[(c & 0x00000FC0) >> 6];
if (pad)
*p++ = '=';
break;
}
if (crLf && length % 3)
{
*p++ = '\r';
*p++ = '\n';
}
*p = 0;
return ret;
}
static INLINE char* base64_encode(const BYTE* WINPR_RESTRICT alphabet,
const BYTE* WINPR_RESTRICT data, size_t length, BOOL pad)
{
return base64_encode_ex(alphabet, data, length, pad, FALSE, 64);
}
static INLINE int base64_decode_char(const signed char* WINPR_RESTRICT alphabet, char c)
{
if (c <= '\0')
return -1;
return alphabet[(size_t)c];
}
static INLINE void* base64_decode(const signed char* WINPR_RESTRICT alphabet,
const char* WINPR_RESTRICT s, size_t length,
size_t* WINPR_RESTRICT data_len, BOOL pad)
{
int n[4];
BYTE* q = NULL;
BYTE* data = NULL;
size_t nBlocks = 0;
size_t outputLen = 0;
const size_t remainder = length % 4;
if ((pad && remainder > 0) || (remainder == 1))
return NULL;
if (!pad && remainder)
length += 4 - remainder;
q = data = (BYTE*)malloc(length / 4 * 3 + 1);
if (!q)
return NULL;
/* first treat complete blocks */
nBlocks = (length / 4);
outputLen = 0;
if (nBlocks < 1)
{
free(data);
return NULL;
}
for (size_t i = 0; i < nBlocks - 1; i++, q += 3)
{
n[0] = base64_decode_char(alphabet, *s++);
n[1] = base64_decode_char(alphabet, *s++);
n[2] = base64_decode_char(alphabet, *s++);
n[3] = base64_decode_char(alphabet, *s++);
if ((n[0] == -1) || (n[1] == -1) || (n[2] == -1) || (n[3] == -1))
goto out_free;
q[0] = (n[0] << 2) + (n[1] >> 4);
q[1] = ((n[1] & 15) << 4) + (n[2] >> 2);
q[2] = ((n[2] & 3) << 6) + n[3];
outputLen += 3;
}
/* treat last block */
n[0] = base64_decode_char(alphabet, *s++);
n[1] = base64_decode_char(alphabet, *s++);
if ((n[0] == -1) || (n[1] == -1))
goto out_free;
n[2] = remainder == 2 ? -1 : base64_decode_char(alphabet, *s++);
n[3] = remainder >= 2 ? -1 : base64_decode_char(alphabet, *s++);
q[0] = (n[0] << 2) + (n[1] >> 4);
if (n[2] == -1)
{
/* XX== */
outputLen += 1;
if (n[3] != -1)
goto out_free;
q[1] = ((n[1] & 15) << 4);
}
else if (n[3] == -1)
{
/* yyy= */
outputLen += 2;
q[1] = ((n[1] & 15) << 4) + (n[2] >> 2);
q[2] = ((n[2] & 3) << 6);
}
else
{
/* XXXX */
outputLen += 3;
q[0] = (n[0] << 2) + (n[1] >> 4);
q[1] = ((n[1] & 15) << 4) + (n[2] >> 2);
q[2] = ((n[2] & 3) << 6) + n[3];
}
if (data_len)
*data_len = outputLen;
data[outputLen] = '\0';
return data;
out_free:
free(data);
return NULL;
}
char* crypto_base64_encode_ex(const BYTE* WINPR_RESTRICT data, size_t length, BOOL withCrLf)
{
return base64_encode_ex(enc_base64, data, length, TRUE, withCrLf, 64);
}
char* crypto_base64_encode(const BYTE* WINPR_RESTRICT data, size_t length)
{
return base64_encode(enc_base64, data, length, TRUE);
}
void crypto_base64_decode(const char* WINPR_RESTRICT enc_data, size_t length,
BYTE** WINPR_RESTRICT dec_data, size_t* WINPR_RESTRICT res_length)
{
*dec_data = base64_decode(dec_base64, enc_data, length, res_length, TRUE);
}
char* crypto_base64url_encode(const BYTE* WINPR_RESTRICT data, size_t length)
{
return base64_encode(enc_base64url, data, length, FALSE);
}
void crypto_base64url_decode(const char* WINPR_RESTRICT enc_data, size_t length,
BYTE** WINPR_RESTRICT dec_data, size_t* WINPR_RESTRICT res_length)
{
*dec_data = base64_decode(dec_base64url, enc_data, length, res_length, FALSE);
}
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