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author | Amos Jeffries <squid3@treenet.co.nz> | 2015-02-10 21:38:47 +0100 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2015-02-10 21:38:47 +0100 |
commit | e6d4db6a9da6bc1bc59c6cb471e53d5e1a236966 (patch) | |
tree | 61e984d2972065228870236f56b80128f5189fbe /base64url-decode.c | |
parent | 400c22286c8bd646806524146d64d041e67ffaed (diff) | |
download | nettle-e6d4db6a9da6bc1bc59c6cb471e53d5e1a236966.tar.gz |
Implement URL safe base64 coding, as specified by RFC 4648.
Diffstat (limited to 'base64url-decode.c')
-rw-r--r-- | base64url-decode.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/base64url-decode.c b/base64url-decode.c new file mode 100644 index 00000000..448d5a66 --- /dev/null +++ b/base64url-decode.c @@ -0,0 +1,64 @@ +/* base64url-decode.c + + Copyright (C) 2015 Amos Jeffries, Niels Möller + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include "base64.h" + +void +base64url_decode_init(struct base64_decode_ctx *ctx) +{ + static const signed char base64url_decode_table[0x100] = + { + /* White space is HT, VT, FF, CR, LF and SPC */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -2, -2, -2, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, + 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -3, -1, -1, + -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63, + -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + }; + + ctx->word = ctx->bits = ctx->padding = 0; + ctx->table = base64url_decode_table; +} |