--- blowfish-internal.h | 52 +++++++++++++++++++++++++++++++++++++++++++++ blowfish.c | 23 ++++++++++---------- 2 files changed, 64 insertions(+), 11 deletions(-) create mode 100644 blowfish-internal.h

diff --git a/blowfish-internal.h b/blowfish-internal.h new file mode 100644 index 00000000..6ededa88 --- /dev/null +++ b/blowfish-internal.h @@ -0,0 +1,52 @@ +/* blowfish-internal.h + + Blowfish block cipher. + + Copyright (C) 2014 Niels Möller + Copyright (C) 1998, 2001 FSF, Ray Dassen, 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/. +*/ + +#ifndef NETTLE_BLOWFISH_INTERNAL_H_INCLUDED +#define NETTLE_BLOWFISH_INTERNAL_H_INCLUDED + +#include "nettle-types.h" + +#ifdef __cplusplus +extern "C" { +#endif + +extern const struct blowfish_ctx _nettle_blowfish_initial_ctx; +extern void _nettle_blowfish_encround (const struct blowfish_ctx *ctx, + uint32_t * ret_xl, uint32_t * ret_xr); + +#ifdef __cplusplus +} +#endif + +#endif /* NETTLE_BLOWFISH_INTERNAL_H_INCLUDED */ diff --git a/blowfish.c b/blowfish.c index 52040f13..e73caffe 100644 --- a/blowfish.c +++ b/blowfish.c @@ -54,12 +54,13 @@ #include <assert.h>

#include "blowfish.h" +#include "blowfish-internal.h"

#include "macros.h"

/* precomputed S boxes */ -static const struct blowfish_ctx -initial_ctx = { +const struct blowfish_ctx +_nettle_blowfish_initial_ctx = { { { /* ks0 */ 0xD1310BA6, 0x98DFB5AC, 0x2FFD72DB, 0xD01ADFB7, 0xB8E1AFED, 0x6A267E96, @@ -261,8 +262,8 @@ initial_ctx = {

#define R(c, l,r,i) do { l ^= c->p[i]; r ^= F(c,l); } while(0)

-static void -encrypt (const struct blowfish_ctx *ctx, uint32_t * ret_xl, +void +_nettle_blowfish_encround (const struct blowfish_ctx *ctx, uint32_t * ret_xl, uint32_t * ret_xr) { uint32_t xl, xr; @@ -295,7 +296,7 @@ encrypt (const struct blowfish_ctx *ctx, uint32_t * ret_xl, }

static void -decrypt (const struct blowfish_ctx *ctx, uint32_t * ret_xl, uint32_t * ret_xr) +decround (const struct blowfish_ctx *ctx, uint32_t * ret_xl, uint32_t * ret_xr) { uint32_t xl, xr;

@@ -339,7 +340,7 @@ blowfish_encrypt (const struct blowfish_ctx *ctx,

d1 = READ_UINT32(src); d2 = READ_UINT32(src+4); - encrypt (ctx, &d1, &d2); + _nettle_blowfish_encround (ctx, &d1, &d2); dst[0] = (d1 >> 24) & 0xff; dst[1] = (d1 >> 16) & 0xff; dst[2] = (d1 >> 8) & 0xff; @@ -361,7 +362,7 @@ blowfish_decrypt (const struct blowfish_ctx *ctx,

d1 = READ_UINT32(src); d2 = READ_UINT32(src+4); - decrypt (ctx, &d1, &d2); + decround (ctx, &d1, &d2); dst[0] = (d1 >> 24) & 0xff; dst[1] = (d1 >> 16) & 0xff; dst[2] = (d1 >> 8) & 0xff; @@ -380,7 +381,7 @@ blowfish_set_key (struct blowfish_ctx *ctx, int i, j; uint32_t data, datal, datar;

- *ctx = initial_ctx; + *ctx = _nettle_blowfish_initial_ctx;

for (i = j = 0; i < _BLOWFISH_ROUNDS + 2; i++) { @@ -393,15 +394,15 @@ blowfish_set_key (struct blowfish_ctx *ctx, datal = datar = 0; for (i = 0; i < _BLOWFISH_ROUNDS + 2; i += 2) { - encrypt (ctx, &datal, &datar); + _nettle_blowfish_encround (ctx, &datal, &datar); ctx->p[i] = datal; ctx->p[i + 1] = datar; } - + for (j = 0; j < 4; j++) for (i = 0; i < 256; i += 2) { - encrypt (ctx, &datal, &datar); + _nettle_blowfish_encround (ctx, &datal, &datar); ctx->s[j][i] = datal; ctx->s[j][i + 1] = datar; }