diff options
Diffstat (limited to 'salsa20-128-set-key.c')
-rw-r--r-- | salsa20-128-set-key.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/salsa20-128-set-key.c b/salsa20-128-set-key.c new file mode 100644 index 00000000..4157c0c7 --- /dev/null +++ b/salsa20-128-set-key.c @@ -0,0 +1,53 @@ +/* + * 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_128_set_key(struct salsa20_ctx *ctx, const uint8_t *key) +{ + ctx->input[11] = ctx->input[1] = LE_READ_UINT32(key + 0); + ctx->input[12] = ctx->input[2] = LE_READ_UINT32(key + 4); + ctx->input[13] = ctx->input[3] = LE_READ_UINT32(key + 8); + ctx->input[14] = ctx->input[4] = LE_READ_UINT32(key + 12); + + /* "expand 16-byte k" */ + ctx->input[0] = 0x61707865; + ctx->input[5] = 0x3120646e; + ctx->input[10] = 0x79622d36; + ctx->input[15] = 0x6b206574; +} |