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106 lines
1.9 KiB
106 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/errno.h> |
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int ceph_armor(char *dst, const char *src, const char *end); |
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int ceph_unarmor(char *dst, const char *src, const char *end); |
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/* |
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* base64 encode/decode. |
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*/ |
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static const char *pem_key = |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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static int encode_bits(int c) |
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{ |
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return pem_key[c]; |
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} |
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static int decode_bits(char c) |
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{ |
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if (c >= 'A' && c <= 'Z') |
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return c - 'A'; |
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if (c >= 'a' && c <= 'z') |
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return c - 'a' + 26; |
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if (c >= '0' && c <= '9') |
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return c - '0' + 52; |
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if (c == '+') |
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return 62; |
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if (c == '/') |
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return 63; |
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if (c == '=') |
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return 0; /* just non-negative, please */ |
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return -EINVAL; |
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} |
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int ceph_armor(char *dst, const char *src, const char *end) |
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{ |
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int olen = 0; |
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int line = 0; |
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while (src < end) { |
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unsigned char a, b, c; |
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a = *src++; |
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*dst++ = encode_bits(a >> 2); |
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if (src < end) { |
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b = *src++; |
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*dst++ = encode_bits(((a & 3) << 4) | (b >> 4)); |
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if (src < end) { |
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c = *src++; |
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*dst++ = encode_bits(((b & 15) << 2) | |
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(c >> 6)); |
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*dst++ = encode_bits(c & 63); |
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} else { |
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*dst++ = encode_bits((b & 15) << 2); |
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*dst++ = '='; |
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} |
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} else { |
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*dst++ = encode_bits(((a & 3) << 4)); |
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*dst++ = '='; |
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*dst++ = '='; |
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} |
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olen += 4; |
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line += 4; |
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if (line == 64) { |
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line = 0; |
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*(dst++) = '\n'; |
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olen++; |
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} |
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} |
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return olen; |
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} |
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int ceph_unarmor(char *dst, const char *src, const char *end) |
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{ |
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int olen = 0; |
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while (src < end) { |
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int a, b, c, d; |
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if (src[0] == '\n') { |
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src++; |
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continue; |
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} |
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if (src + 4 > end) |
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return -EINVAL; |
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a = decode_bits(src[0]); |
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b = decode_bits(src[1]); |
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c = decode_bits(src[2]); |
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d = decode_bits(src[3]); |
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if (a < 0 || b < 0 || c < 0 || d < 0) |
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return -EINVAL; |
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*dst++ = (a << 2) | (b >> 4); |
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if (src[2] == '=') |
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return olen + 1; |
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*dst++ = ((b & 15) << 4) | (c >> 2); |
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if (src[3] == '=') |
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return olen + 2; |
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*dst++ = ((c & 3) << 6) | d; |
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olen += 3; |
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src += 4; |
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} |
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return olen; |
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}
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