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1 | ||
2 | #include <linux/errno.h> | |
3 | ||
4 | int ceph_armor(char *dst, const char *src, const char *end); | |
5 | int ceph_unarmor(char *dst, const char *src, const char *end); | |
6 | ||
7 | /* | |
8 | * base64 encode/decode. | |
9 | */ | |
10 | ||
11 | static const char *pem_key = | |
12 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | |
13 | ||
14 | static int encode_bits(int c) | |
15 | { | |
16 | return pem_key[c]; | |
17 | } | |
18 | ||
19 | static int decode_bits(char c) | |
20 | { | |
21 | if (c >= 'A' && c <= 'Z') | |
22 | return c - 'A'; | |
23 | if (c >= 'a' && c <= 'z') | |
24 | return c - 'a' + 26; | |
25 | if (c >= '0' && c <= '9') | |
26 | return c - '0' + 52; | |
27 | if (c == '+') | |
28 | return 62; | |
29 | if (c == '/') | |
30 | return 63; | |
31 | if (c == '=') | |
32 | return 0; /* just non-negative, please */ | |
33 | return -EINVAL; | |
34 | } | |
35 | ||
36 | int ceph_armor(char *dst, const char *src, const char *end) | |
37 | { | |
38 | int olen = 0; | |
39 | int line = 0; | |
40 | ||
41 | while (src < end) { | |
42 | unsigned char a, b, c; | |
43 | ||
44 | a = *src++; | |
45 | *dst++ = encode_bits(a >> 2); | |
46 | if (src < end) { | |
47 | b = *src++; | |
48 | *dst++ = encode_bits(((a & 3) << 4) | (b >> 4)); | |
49 | if (src < end) { | |
50 | c = *src++; | |
51 | *dst++ = encode_bits(((b & 15) << 2) | | |
52 | (c >> 6)); | |
53 | *dst++ = encode_bits(c & 63); | |
54 | } else { | |
55 | *dst++ = encode_bits((b & 15) << 2); | |
56 | *dst++ = '='; | |
57 | } | |
58 | } else { | |
59 | *dst++ = encode_bits(((a & 3) << 4)); | |
60 | *dst++ = '='; | |
61 | *dst++ = '='; | |
62 | } | |
63 | olen += 4; | |
64 | line += 4; | |
65 | if (line == 64) { | |
66 | line = 0; | |
67 | *(dst++) = '\n'; | |
68 | olen++; | |
69 | } | |
70 | } | |
71 | return olen; | |
72 | } | |
73 | ||
74 | int ceph_unarmor(char *dst, const char *src, const char *end) | |
75 | { | |
76 | int olen = 0; | |
77 | ||
78 | while (src < end) { | |
79 | int a, b, c, d; | |
80 | ||
81 | if (src[0] == '\n') { | |
82 | src++; | |
83 | continue; | |
84 | } | |
85 | if (src + 4 > end) | |
86 | return -EINVAL; | |
87 | a = decode_bits(src[0]); | |
88 | b = decode_bits(src[1]); | |
89 | c = decode_bits(src[2]); | |
90 | d = decode_bits(src[3]); | |
91 | if (a < 0 || b < 0 || c < 0 || d < 0) | |
92 | return -EINVAL; | |
93 | ||
94 | *dst++ = (a << 2) | (b >> 4); | |
95 | if (src[2] == '=') | |
96 | return olen + 1; | |
97 | *dst++ = ((b & 15) << 4) | (c >> 2); | |
98 | if (src[3] == '=') | |
99 | return olen + 2; | |
100 | *dst++ = ((c & 3) << 6) | d; | |
101 | olen += 3; | |
102 | src += 4; | |
103 | } | |
104 | return olen; | |
105 | } |