crypto: blowfish - rename C-version to blowfish_generic

[mirror_ubuntu-artful-kernel.git] / crypto / blowfish_generic.c

diff --git a/crypto/blowfish_generic.c b/crypto/blowfish_generic.c
new file mode 100644 (file)
index 0000000..6f269b5
--- /dev/null
+++ b/crypto/blowfish_generic.c
@@ -0,0 +1,142 @@
+/*
+ * Cryptographic API.
+ *
+ * Blowfish Cipher Algorithm, by Bruce Schneier.
+ * http://www.counterpane.com/blowfish.html
+ *
+ * Adapted from Kerneli implementation.
+ *
+ * Copyright (c) Herbert Valerio Riedel <hvr@hvrlab.org>
+ * Copyright (c) Kyle McMartin <kyle@debian.org>
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of 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.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <asm/byteorder.h>
+#include <linux/crypto.h>
+#include <linux/types.h>
+#include <crypto/blowfish.h>
+
+/*
+ * Round loop unrolling macros, S is a pointer to a S-Box array
+ * organized in 4 unsigned longs at a row.
+ */
+#define GET32_3(x) (((x) & 0xff))
+#define GET32_2(x) (((x) >> (8)) & (0xff))
+#define GET32_1(x) (((x) >> (16)) & (0xff))
+#define GET32_0(x) (((x) >> (24)) & (0xff))
+
+#define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
+               S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
+
+#define ROUND(a, b, n) ({ b ^= P[n]; a ^= bf_F(b); })
+
+static void bf_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+       struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
+       const __be32 *in_blk = (const __be32 *)src;
+       __be32 *const out_blk = (__be32 *)dst;
+       const u32 *P = ctx->p;
+       const u32 *S = ctx->s;
+       u32 yl = be32_to_cpu(in_blk[0]);
+       u32 yr = be32_to_cpu(in_blk[1]);
+
+       ROUND(yr, yl, 0);
+       ROUND(yl, yr, 1);
+       ROUND(yr, yl, 2);
+       ROUND(yl, yr, 3);
+       ROUND(yr, yl, 4);
+       ROUND(yl, yr, 5);
+       ROUND(yr, yl, 6);
+       ROUND(yl, yr, 7);
+       ROUND(yr, yl, 8);
+       ROUND(yl, yr, 9);
+       ROUND(yr, yl, 10);
+       ROUND(yl, yr, 11);
+       ROUND(yr, yl, 12);
+       ROUND(yl, yr, 13);
+       ROUND(yr, yl, 14);
+       ROUND(yl, yr, 15);
+
+       yl ^= P[16];
+       yr ^= P[17];
+
+       out_blk[0] = cpu_to_be32(yr);
+       out_blk[1] = cpu_to_be32(yl);
+}
+
+static void bf_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+       struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
+       const __be32 *in_blk = (const __be32 *)src;
+       __be32 *const out_blk = (__be32 *)dst;
+       const u32 *P = ctx->p;
+       const u32 *S = ctx->s;
+       u32 yl = be32_to_cpu(in_blk[0]);
+       u32 yr = be32_to_cpu(in_blk[1]);
+
+       ROUND(yr, yl, 17);
+       ROUND(yl, yr, 16);
+       ROUND(yr, yl, 15);
+       ROUND(yl, yr, 14);
+       ROUND(yr, yl, 13);
+       ROUND(yl, yr, 12);
+       ROUND(yr, yl, 11);
+       ROUND(yl, yr, 10);
+       ROUND(yr, yl, 9);
+       ROUND(yl, yr, 8);
+       ROUND(yr, yl, 7);
+       ROUND(yl, yr, 6);
+       ROUND(yr, yl, 5);
+       ROUND(yl, yr, 4);
+       ROUND(yr, yl, 3);
+       ROUND(yl, yr, 2);
+
+       yl ^= P[1];
+       yr ^= P[0];
+
+       out_blk[0] = cpu_to_be32(yr);
+       out_blk[1] = cpu_to_be32(yl);
+}
+
+static struct crypto_alg alg = {
+       .cra_name               =       "blowfish",
+       .cra_driver_name        =       "blowfish-generic",
+       .cra_priority           =       100,
+       .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
+       .cra_blocksize          =       BF_BLOCK_SIZE,
+       .cra_ctxsize            =       sizeof(struct bf_ctx),
+       .cra_alignmask          =       3,
+       .cra_module             =       THIS_MODULE,
+       .cra_list               =       LIST_HEAD_INIT(alg.cra_list),
+       .cra_u                  =       { .cipher = {
+       .cia_min_keysize        =       BF_MIN_KEY_SIZE,
+       .cia_max_keysize        =       BF_MAX_KEY_SIZE,
+       .cia_setkey             =       blowfish_setkey,
+       .cia_encrypt            =       bf_encrypt,
+       .cia_decrypt            =       bf_decrypt } }
+};
+
+static int __init blowfish_mod_init(void)
+{
+       return crypto_register_alg(&alg);
+}
+
+static void __exit blowfish_mod_fini(void)
+{
+       crypto_unregister_alg(&alg);
+}
+
+module_init(blowfish_mod_init);
+module_exit(blowfish_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blowfish Cipher Algorithm");
+MODULE_ALIAS("blowfish");