mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
279 lines
6.5 KiB
279 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Cryptographic API. |
|
* |
|
* 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 [email protected] |
|
*/ |
|
|
|
#include <linux/init.h> |
|
#include <linux/module.h> |
|
#include <linux/mm.h> |
|
#include <asm/byteorder.h> |
|
#include <linux/crypto.h> |
|
#include <linux/types.h> |
|
|
|
#define TEA_KEY_SIZE 16 |
|
#define TEA_BLOCK_SIZE 8 |
|
#define TEA_ROUNDS 32 |
|
#define TEA_DELTA 0x9e3779b9 |
|
|
|
#define XTEA_KEY_SIZE 16 |
|
#define XTEA_BLOCK_SIZE 8 |
|
#define XTEA_ROUNDS 32 |
|
#define XTEA_DELTA 0x9e3779b9 |
|
|
|
struct tea_ctx { |
|
u32 KEY[4]; |
|
}; |
|
|
|
struct xtea_ctx { |
|
u32 KEY[4]; |
|
}; |
|
|
|
static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
|
unsigned int key_len) |
|
{ |
|
struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
const __le32 *key = (const __le32 *)in_key; |
|
|
|
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 tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, n, sum = 0; |
|
u32 k0, k1, k2, k3; |
|
struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
const __le32 *in = (const __le32 *)src; |
|
__le32 *out = (__le32 *)dst; |
|
|
|
y = le32_to_cpu(in[0]); |
|
z = le32_to_cpu(in[1]); |
|
|
|
k0 = ctx->KEY[0]; |
|
k1 = ctx->KEY[1]; |
|
k2 = ctx->KEY[2]; |
|
k3 = ctx->KEY[3]; |
|
|
|
n = TEA_ROUNDS; |
|
|
|
while (n-- > 0) { |
|
sum += TEA_DELTA; |
|
y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); |
|
z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); |
|
} |
|
|
|
out[0] = cpu_to_le32(y); |
|
out[1] = cpu_to_le32(z); |
|
} |
|
|
|
static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, n, sum; |
|
u32 k0, k1, k2, k3; |
|
struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
const __le32 *in = (const __le32 *)src; |
|
__le32 *out = (__le32 *)dst; |
|
|
|
y = le32_to_cpu(in[0]); |
|
z = le32_to_cpu(in[1]); |
|
|
|
k0 = ctx->KEY[0]; |
|
k1 = ctx->KEY[1]; |
|
k2 = ctx->KEY[2]; |
|
k3 = ctx->KEY[3]; |
|
|
|
sum = TEA_DELTA << 5; |
|
|
|
n = TEA_ROUNDS; |
|
|
|
while (n-- > 0) { |
|
z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); |
|
y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); |
|
sum -= TEA_DELTA; |
|
} |
|
|
|
out[0] = cpu_to_le32(y); |
|
out[1] = cpu_to_le32(z); |
|
} |
|
|
|
static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
|
unsigned int key_len) |
|
{ |
|
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
const __le32 *key = (const __le32 *)in_key; |
|
|
|
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(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, sum = 0; |
|
u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
|
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
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 xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, sum; |
|
struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
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(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, sum = 0; |
|
u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
|
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
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(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
|
{ |
|
u32 y, z, sum; |
|
struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
|
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 struct crypto_alg tea_algs[3] = { { |
|
.cra_name = "tea", |
|
.cra_driver_name = "tea-generic", |
|
.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_u = { .cipher = { |
|
.cia_min_keysize = TEA_KEY_SIZE, |
|
.cia_max_keysize = TEA_KEY_SIZE, |
|
.cia_setkey = tea_setkey, |
|
.cia_encrypt = tea_encrypt, |
|
.cia_decrypt = tea_decrypt } } |
|
}, { |
|
.cra_name = "xtea", |
|
.cra_driver_name = "xtea-generic", |
|
.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_u = { .cipher = { |
|
.cia_min_keysize = XTEA_KEY_SIZE, |
|
.cia_max_keysize = XTEA_KEY_SIZE, |
|
.cia_setkey = xtea_setkey, |
|
.cia_encrypt = xtea_encrypt, |
|
.cia_decrypt = xtea_decrypt } } |
|
}, { |
|
.cra_name = "xeta", |
|
.cra_driver_name = "xeta-generic", |
|
.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_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 tea_mod_init(void) |
|
{ |
|
return crypto_register_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
|
} |
|
|
|
static void __exit tea_mod_fini(void) |
|
{ |
|
crypto_unregister_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
|
} |
|
|
|
MODULE_ALIAS_CRYPTO("tea"); |
|
MODULE_ALIAS_CRYPTO("xtea"); |
|
MODULE_ALIAS_CRYPTO("xeta"); |
|
|
|
subsys_initcall(tea_mod_init); |
|
module_exit(tea_mod_fini); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");
|
|
|