/*
* Cryptographic API.
*
- * TEA and Xtended TEA Algorithms
+ * TEA, XTEA, and XETA crypto alogrithms
*
* The TEA and Xtended TEA algorithms were developed by David Wheeler
* and Roger Needham at the Computer Laboratory of Cambridge University.
*
+ * Due to the order of evaluation in XTEA many people have incorrectly
+ * implemented it. XETA (XTEA in the wrong order), exists for
+ * compatibility with these implementations.
+ *
* Copyright (c) 2004 Aaron Grothe ajgrothe@yahoo.com
*
* This program is free software; you can redistribute it and/or modify
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
+#include <asm/byteorder.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
+#include <linux/types.h>
#define TEA_KEY_SIZE 16
#define TEA_BLOCK_SIZE 8
#define XTEA_ROUNDS 32
#define XTEA_DELTA 0x9e3779b9
-#define u32_in(x) le32_to_cpu(*(const __le32 *)(x))
-#define u32_out(to, from) (*(__le32 *)(to) = cpu_to_le32(from))
-
struct tea_ctx {
u32 KEY[4];
};
static int tea_setkey(void *ctx_arg, const u8 *in_key,
unsigned int key_len, u32 *flags)
{
-
struct tea_ctx *ctx = ctx_arg;
+ const __le32 *key = (const __le32 *)in_key;
if (key_len != 16)
{
return -EINVAL;
}
- ctx->KEY[0] = u32_in (in_key);
- ctx->KEY[1] = u32_in (in_key + 4);
- ctx->KEY[2] = u32_in (in_key + 8);
- ctx->KEY[3] = u32_in (in_key + 12);
+ ctx->KEY[0] = le32_to_cpu(key[0]);
+ ctx->KEY[1] = le32_to_cpu(key[1]);
+ ctx->KEY[2] = le32_to_cpu(key[2]);
+ ctx->KEY[3] = le32_to_cpu(key[3]);
return 0;
u32 k0, k1, k2, k3;
struct tea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
- y = u32_in (src);
- z = u32_in (src + 4);
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
k0 = ctx->KEY[0];
k1 = ctx->KEY[1];
z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
}
- u32_out (dst, y);
- u32_out (dst + 4, z);
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
}
static void tea_decrypt(void *ctx_arg, u8 *dst, const u8 *src)
{
u32 y, z, n, sum;
u32 k0, k1, k2, k3;
-
struct tea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
- y = u32_in (src);
- z = u32_in (src + 4);
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
k0 = ctx->KEY[0];
k1 = ctx->KEY[1];
sum -= TEA_DELTA;
}
- u32_out (dst, y);
- u32_out (dst + 4, z);
-
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
}
static int xtea_setkey(void *ctx_arg, const u8 *in_key,
unsigned int key_len, u32 *flags)
{
-
struct xtea_ctx *ctx = ctx_arg;
+ const __le32 *key = (const __le32 *)in_key;
if (key_len != 16)
{
return -EINVAL;
}
- ctx->KEY[0] = u32_in (in_key);
- ctx->KEY[1] = u32_in (in_key + 4);
- ctx->KEY[2] = u32_in (in_key + 8);
- ctx->KEY[3] = u32_in (in_key + 12);
+ ctx->KEY[0] = le32_to_cpu(key[0]);
+ ctx->KEY[1] = le32_to_cpu(key[1]);
+ ctx->KEY[2] = le32_to_cpu(key[2]);
+ ctx->KEY[3] = le32_to_cpu(key[3]);
return 0;
static void xtea_encrypt(void *ctx_arg, u8 *dst, const u8 *src)
{
-
u32 y, z, sum = 0;
u32 limit = XTEA_DELTA * XTEA_ROUNDS;
struct xtea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
- y = u32_in (src);
- z = u32_in (src + 4);
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
while (sum != limit) {
- y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3];
+ y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]);
sum += XTEA_DELTA;
- z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3];
+ z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]);
}
- u32_out (dst, y);
- u32_out (dst + 4, z);
-
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
}
static void xtea_decrypt(void *ctx_arg, u8 *dst, const u8 *src)
{
+ u32 y, z, sum;
+ struct tea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
+
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
+
+ sum = XTEA_DELTA * XTEA_ROUNDS;
+
+ while (sum) {
+ z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]);
+ sum -= XTEA_DELTA;
+ y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]);
+ }
+
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
+}
+
+
+static void xeta_encrypt(void *ctx_arg, u8 *dst, const u8 *src)
+{
+ u32 y, z, sum = 0;
+ u32 limit = XTEA_DELTA * XTEA_ROUNDS;
+
+ struct xtea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
+
+ while (sum != limit) {
+ y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3];
+ sum += XTEA_DELTA;
+ z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3];
+ }
+
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
+}
+
+static void xeta_decrypt(void *ctx_arg, u8 *dst, const u8 *src)
+{
u32 y, z, sum;
struct tea_ctx *ctx = ctx_arg;
+ const __le32 *in = (const __le32 *)src;
+ __le32 *out = (__le32 *)dst;
- y = u32_in (src);
- z = u32_in (src + 4);
+ y = le32_to_cpu(in[0]);
+ z = le32_to_cpu(in[1]);
sum = XTEA_DELTA * XTEA_ROUNDS;
y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3];
}
- u32_out (dst, y);
- u32_out (dst + 4, z);
-
+ out[0] = cpu_to_le32(y);
+ out[1] = cpu_to_le32(z);
}
static struct crypto_alg tea_alg = {
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = TEA_BLOCK_SIZE,
.cra_ctxsize = sizeof (struct tea_ctx),
+ .cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(tea_alg.cra_list),
.cra_u = { .cipher = {
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = XTEA_BLOCK_SIZE,
.cra_ctxsize = sizeof (struct xtea_ctx),
+ .cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
.cra_u = { .cipher = {
.cia_decrypt = xtea_decrypt } }
};
+static struct crypto_alg xeta_alg = {
+ .cra_name = "xeta",
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = XTEA_BLOCK_SIZE,
+ .cra_ctxsize = sizeof (struct xtea_ctx),
+ .cra_alignmask = 3,
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
+ .cra_u = { .cipher = {
+ .cia_min_keysize = XTEA_KEY_SIZE,
+ .cia_max_keysize = XTEA_KEY_SIZE,
+ .cia_setkey = xtea_setkey,
+ .cia_encrypt = xeta_encrypt,
+ .cia_decrypt = xeta_decrypt } }
+};
+
static int __init init(void)
{
int ret = 0;
goto out;
}
+ ret = crypto_register_alg(&xeta_alg);
+ if (ret < 0) {
+ crypto_unregister_alg(&tea_alg);
+ crypto_unregister_alg(&xtea_alg);
+ goto out;
+ }
+
out:
return ret;
}
{
crypto_unregister_alg(&tea_alg);
crypto_unregister_alg(&xtea_alg);
+ crypto_unregister_alg(&xeta_alg);
}
MODULE_ALIAS("xtea");
+MODULE_ALIAS("xeta");
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("TEA & XTEA Cryptographic Algorithms");
+MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");
git://git.onelab.eu / linux-2.6.git / blobdiff