// 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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