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author | Niels Möller <nisse@lysator.liu.se> | 2014-01-20 16:03:07 +0100 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2014-01-20 16:03:07 +0100 |
commit | 4c4f66470a6f8cc248711cd5572f9ad2ca290e69 (patch) | |
tree | 3b37f1620495c5bb4a2f17b70c09c87c9f45e102 /salsa20-256-set-key.c | |
parent | 61d9a6a04bb7e75dc01acc7ba9c30b003e7739ac (diff) | |
download | nettle-4c4f66470a6f8cc248711cd5572f9ad2ca290e69.tar.gz |
Separate salsa20 set_key functions for 128 and 256 bits.
Diffstat (limited to 'salsa20-256-set-key.c')
-rw-r--r-- | salsa20-256-set-key.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/salsa20-256-set-key.c b/salsa20-256-set-key.c new file mode 100644 index 00000000..c820b501 --- /dev/null +++ b/salsa20-256-set-key.c @@ -0,0 +1,58 @@ +/* + * The Salsa20 stream cipher. + */ + +/* nettle, low-level cryptographics library + * + * Copyright (C) 2012 Simon Josefsson + * Copyright (C) 2012-2014 Niels Möller + * + * The nettle library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or (at your + * option) any later version. + * + * The nettle library 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 Lesser General Public + * License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with the nettle library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02111-1301, USA. + */ + +/* Based on: + salsa20-ref.c version 20051118 + D. J. Bernstein + Public domain. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include "salsa20.h" + +#include "macros.h" + +void +salsa20_256_set_key(struct salsa20_ctx *ctx, const uint8_t *key) +{ + ctx->input[1] = LE_READ_UINT32(key + 0); + ctx->input[2] = LE_READ_UINT32(key + 4); + ctx->input[3] = LE_READ_UINT32(key + 8); + ctx->input[4] = LE_READ_UINT32(key + 12); + + ctx->input[11] = LE_READ_UINT32(key + 16); + ctx->input[12] = LE_READ_UINT32(key + 20); + ctx->input[13] = LE_READ_UINT32(key + 24); + ctx->input[14] = LE_READ_UINT32(key + 28); + + /* "expand 32-byte k" */ + ctx->input[0] = 0x61707865; + ctx->input[5] = 0x3320646e; + ctx->input[10] = 0x79622d32; + ctx->input[15] = 0x6b206574; +} |