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xxtea-c
Commit 6ba543bb authored by andot's avatar andot
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Fixed key and added base64 in example.

parent 72ce9f7e
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Showing with 229 additions and 53 deletions
.gitignore
View file @ 6ba543bb
CMakeFiles/*
example/CMakeFiles/*
*.cmake
......@@ -12,3 +13,5 @@ CMakeCache.txt
*.a
Makefile
example/main
README.md
View file @ 6ba543bb
......@@ -26,7 +26,7 @@ int main() {
const char *text = "Hello World! 你好，中国！";
const char *key = "1234567890";
size_t len;
char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
unsigned char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
char *decrypt_data = xxtea_decrypt(encrypt_data, len, key, &len);
if (strncmp(text, decrypt_data, len) == 0) {
printf("success!\n");
......
README_zh_CN.md
View file @ 6ba543bb
......@@ -26,7 +26,7 @@ int main() {
const char *text = "Hello World! 你好，中国！";
const char *key = "1234567890";
size_t len;
char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
unsigned char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
char *decrypt_data = xxtea_decrypt(encrypt_data, len, key, &len);
if (strncmp(text, decrypt_data, len) == 0) {
printf("success!\n");
......
example/base64.c 0 → 100644
View file @ 6ba543bb
/**********************************************************\
| |
| base64.c |
| |
| Base64 library for C. |
| |
| Code Authors: Chen fei <cf850118@163.com> |
| Ma Bingyao <mabingyao@gmail.com> |
| LastModified: Mar 3, 2015 |
| |
\**********************************************************/
#include <string.h>
#include "base64.h"
static const char Base64EncodeChars[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'
};
static const char Base64DecodeChars[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
};
char * base64_encode(const unsigned char * data, size_t len) {
char *out, *pos;
const unsigned char *in = data;
size_t i, quot, rem;
int c;
if (!len) return NULL;
quot = len / 3;
rem = len % 3;
out = (char *)malloc((quot + (rem ? 1 : 0)) * 4 + 1);
if (!out) return NULL;
pos = out;
for (i = 0; i < quot; i++) {
c = (0x000000ff & *in++) << 16;
c |= (0x000000ff & *in++) << 8;
c |= 0x000000ff & *in++;
*pos++ = Base64EncodeChars[c >> 18];
*pos++ = Base64EncodeChars[c >> 12 & 0x3f];
*pos++ = Base64EncodeChars[c >> 6 & 0x3f];
*pos++ = Base64EncodeChars[c & 0x3f];
}
if (rem == 1) {
c = 0x000000ff & *in++;
*pos++ = Base64EncodeChars[c >> 2];
*pos++ = Base64EncodeChars[(c & 0x03) << 4];
*pos++ = '=';
*pos++ = '=';
}
else if (rem == 2) {
c = (0x000000ff & *in++) << 8;
c |= 0x000000ff & *in++;
*pos++ = Base64EncodeChars[c >> 10];
*pos++ = Base64EncodeChars[c >> 4 & 0x3f];
*pos++ = Base64EncodeChars[(c & 0x0f) << 2];
*pos++ = '=';
}
*pos = '\0';
return out;
}
unsigned char * base64_decode(const char * data, size_t * out_len) {
unsigned char *out, *pos;
const unsigned char *in = (const unsigned char *)data;
size_t i, len, quot, rem, paddings = 0;
int c;
len = strlen(data);
if (!len) return NULL;
rem = len % 4;
if (rem) return NULL; // invalid size
quot = len / 4;
if (data[len - 2] == '=')
paddings = 2;
else if (data[len - 1] == '=')
paddings = 1;
out = (unsigned char *)malloc(quot * 3 - paddings + 1);
if (!out) return NULL;
pos = out;
for (i = 0; i < quot; i++) {
c = Base64DecodeChars[(int)*in++] << 18;
c += Base64DecodeChars[(int)*in++] << 12;
*pos++ = (c & 0x00ff0000) >> 16;
if (*in != '=') {
c += Base64DecodeChars[(int)*in++] << 6;
*pos++ = (c & 0x0000ff00) >> 8;
if (*in != '=') {
c += Base64DecodeChars[(int)*in++];
*pos++ = c & 0x000000ff;
}
}
}
*pos = '\0';
*out_len = pos - out;
return out;
}
example/base64.h 0 → 100644
View file @ 6ba543bb
/**********************************************************\
| |
| base64.h |
| |
| Base64 library for C. |
| |
| Code Authors: Chen fei <cf850118@163.com> |
| Ma Bingyao <mabingyao@gmail.com> |
| LastModified: Mar 3, 2015 |
| |
\**********************************************************/
#ifndef BASE64_INCLUDED
#define BASE64_INCLUDED
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Function: base64_encode
* @data: Data to be encoded
* @len: Length of the data to be encoded
* Returns: Encoded data or %NULL on failure
*
* Caller is responsible for freeing the returned buffer.
*/
char * base64_encode(const unsigned char * data, size_t len);
/**
* Function: base64_decode
* @data: Data to be decoded
* @out_len: Pointer to output length variable
* Returns: Decoded data or %NULL on failure
*
* Caller is responsible for freeing the returned buffer.
*/
unsigned char * base64_decode(const char * data, size_t * out_len);
#ifdef __cplusplus
}
#endif
#endif
example/test.c
View file @ 6ba543bb
#include <stdio.h>
#include <string.h>
#include <xxtea.h>
#include "base64.h"
int main() {
const char *text = "Hello World! 你好，中国！";
const char *key = "1234567890";
size_t len;
char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
unsigned char *encrypt_data = xxtea_encrypt(text, strlen(text), key, &len);
char * base64_data = base64_encode(encrypt_data, len);
printf("%s\n", base64_data);
char *decrypt_data = xxtea_decrypt(encrypt_data, len, key, &len);
if (strncmp(text, decrypt_data, len) == 0) {
printf("success!\n");
......@@ -16,5 +19,6 @@ int main() {
}
free(encrypt_data);
free(decrypt_data);
free(base64_data);
return 0;
}
xxtea.c
View file @ 6ba543bb
......@@ -2,13 +2,14 @@
| |
| xxtea.c |
| |
| XXTEA encryption algorithm library for Golang. |
| XXTEA encryption algorithm library for C. |
| |
| Encryption Algorithm Authors: |
| David J. Wheeler |
| Roger M. Needham |
| |
| Code Author: Ma Bingyao <mabingyao@gmail.com> |
| Code Authors: Chen fei <cf850118@163.com> |
| Ma Bingyao <mabingyao@gmail.com> |
| LastModified: Mar 3, 2015 |
| |
\**********************************************************/
......@@ -16,7 +17,7 @@
#include "xxtea.h"
#include <stddef.h>
#include <string.h>
#if defined(_MSC_VER) && _MSC_VER < 1600
typedef unsigned __int8 uint8_t;
typedef unsigned __int32 uint32_t;
......@@ -27,8 +28,16 @@ typedef unsigned __int32 uint32_t;
#define MX (((z >> 5) ^ (y << 2)) + ((y >> 3) ^ (z << 4))) ^ ((sum ^ y) + (key[(p & 3) ^ e] ^ z))
#define DELTA 0x9e3779b9
#define FIXED_KEY \
size_t i, j;\
uint8_t fixed_key[16];\
memcpy(fixed_key, key, 16);\
for (i = 0; (i < 16) && (fixed_key[i] != 0); ++i);\
for (j = i + 1; j < 16; ++j) fixed_key[j] = 0;\
/**
* Method: xxtea_to_uint_array
* Function: xxtea_to_uint_array
* @data: Data to be converted
* @len: Length of the data to be converted
* @inc_len: Including the length of the information?
......@@ -37,29 +46,25 @@ typedef unsigned __int32 uint32_t;
*
* Caller is responsible for freeing the returned buffer.
*/
uint32_t * xxtea_to_uint_array(const uint8_t * data, size_t len, int inc_len, size_t * out_len)
{
uint32_t * xxtea_to_uint_array(const uint8_t * data, size_t len, int inc_len, size_t * out_len) {
uint32_t *out;
size_t i, n;
n = (((len & 3) == 0) ? (len >> 2) : ((len >> 2) + 1));
if (inc_len)
{
if (inc_len) {
out = (uint32_t *)calloc(n + 1, sizeof(uint32_t));
if (!out) return NULL;
out[n] = (uint32_t)len;
*out_len = n + 1;
}
else
{
else {
out = (uint32_t *)calloc(n, sizeof(uint32_t));
if (!out) return NULL;
*out_len = n;
}
for (i = 0; i < len; i++)
{
for (i = 0; i < len; ++i) {
out[i >> 2] |= (uint32_t)data[i] << ((i & 3) << 3);
}
......@@ -67,7 +72,7 @@ uint32_t * xxtea_to_uint_array(const uint8_t * data, size_t len, int inc_len, si
}
/**
* Method: xxtea_to_ubyte_array
* Function: xxtea_to_ubyte_array
* @data: Data to be converted
* @len: Length of the data to be converted
* @inc_len: Included the length of the information?
......@@ -76,15 +81,13 @@ uint32_t * xxtea_to_uint_array(const uint8_t * data, size_t len, int inc_len, si
*
* Caller is responsible for freeing the returned buffer.
*/
uint8_t * xxtea_to_ubyte_array(const uint32_t * data, size_t len, int inc_len, size_t * out_len)
{
uint8_t * xxtea_to_ubyte_array(const uint32_t * data, size_t len, int inc_len, size_t * out_len) {
uint8_t *out;
size_t i, m, n;
n = len << 2;
if (inc_len)
{
if (inc_len) {
m = data[len - 1];
if (m > n) return NULL;
n = m;
......@@ -92,8 +95,7 @@ uint8_t * xxtea_to_ubyte_array(const uint32_t * data, size_t len, int inc_len, s
out = (uint8_t *)malloc(n + 1);
for (i = 0; i < n; i++)
{
for (i = 0; i < n; ++i) {
out[i] = (uint8_t)(data[i >> 2] >> ((i & 3) << 3));
}
......@@ -104,26 +106,23 @@ uint8_t * xxtea_to_ubyte_array(const uint32_t * data, size_t len, int inc_len, s
}
/**
* Method: xxtea_uint_encrypt
* Function: xxtea_uint_encrypt
* @data: Data to be encrypted
* @len: Length of the data to be encrypted
* @key: Symmetric key
* Returns: Encrypted data
*/
uint32_t * xxtea_uint_encrypt(uint32_t * data, size_t len, uint32_t * key)
{
uint32_t * xxtea_uint_encrypt(uint32_t * data, size_t len, uint32_t * key) {
uint32_t n = (uint32_t)len - 1;
uint32_t z = data[n], y = data[0], p, q = 6 + 52 / (n + 1), sum = 0, e;
if (n < 1) return data;
while (0 < q--)
{
while (0 < q--) {
sum += DELTA;
e = sum >> 2 & 3;
for (p = 0; p < n; p++)
{
for (p = 0; p < n; p++) {
y = data[p + 1];
z = data[p] += MX;
}
......@@ -136,25 +135,22 @@ uint32_t * xxtea_uint_encrypt(uint32_t * data, size_t len, uint32_t * key)
}
/**
* Method: xxtea_uint_decrypt
* Function: xxtea_uint_decrypt
* @data: Data to be decrypted
* @len: Length of the data to be decrypted
* @key: Symmetric key
* Returns: Decrypted data
*/
uint32_t * xxtea_uint_decrypt(uint32_t * data, size_t len, uint32_t * key)
{
uint32_t * xxtea_uint_decrypt(uint32_t * data, size_t len, uint32_t * key) {
uint32_t n = (uint32_t)len - 1;
uint32_t z = data[n], y = data[0], p, q = 6 + 52 / (n + 1), sum = q * DELTA, e;
if (n < 1) return data;
while (sum != 0)
{
while (sum != 0) {
e = sum >> 2 & 3;
for (p = n; p > 0; p--)
{
for (p = n; p > 0; p--) {
z = data[p - 1];
y = data[p] -= MX;
}
......@@ -168,7 +164,7 @@ uint32_t * xxtea_uint_decrypt(uint32_t * data, size_t len, uint32_t * key)
}
/**
* Method: xxtea_encrypt
* Function: xxtea_encrypt_ubyte
* @data: Data to be encrypted
* @len: Length of the data to be encrypted
* @key: Symmetric key
......@@ -177,8 +173,7 @@ uint32_t * xxtea_uint_decrypt(uint32_t * data, size_t len, uint32_t * key)
*
* Caller is responsible for freeing the returned buffer.
*/
uint8_t * xxtea_encrypt_ubyte(const uint8_t * data, size_t len, const uint8_t * key, size_t * out_len)
{
uint8_t * xxtea_encrypt_ubyte(const uint8_t * data, size_t len, const uint8_t * key, size_t * out_len) {
uint8_t *out;
uint32_t *data_array, *key_array;
size_t data_len, key_len;
......@@ -189,8 +184,7 @@ uint8_t * xxtea_encrypt_ubyte(const uint8_t * data, size_t len, const uint8_t *
if (!data_array) return NULL;
key_array = xxtea_to_uint_array(key, 16, 0, &key_len);
if (!key_array)
{
if (!key_array) {
free(data_array);
return NULL;
}
......@@ -203,12 +197,8 @@ uint8_t * xxtea_encrypt_ubyte(const uint8_t * data, size_t len, const uint8_t *
return out;
}
void * xxtea_encrypt(const void * data, size_t len, const void * key, size_t * out_len) {
return xxtea_encrypt_ubyte(data, len, key, out_len);
}
/**
* Method: xxtea_decrypt
* Function: xxtea_decrypt_ubyte
* @data: Data to be decrypted
* @len: Length of the data to be decrypted
* @key: Symmetric key
......@@ -217,8 +207,7 @@ void * xxtea_encrypt(const void * data, size_t len, const void * key, size_t * o
*
* Caller is responsible for freeing the returned buffer.
*/
uint8_t * xxtea_decrypt_ubyte(const uint8_t * data, size_t len, const uint8_t * key, size_t * out_len)
{
uint8_t * xxtea_decrypt_ubyte(const uint8_t * data, size_t len, const uint8_t * key, size_t * out_len) {
uint8_t *out;
uint32_t *data_array, *key_array;
size_t data_len, key_len;
......@@ -229,8 +218,7 @@ uint8_t * xxtea_decrypt_ubyte(const uint8_t * data, size_t len, const uint8_t *
if (!data_array) return NULL;
key_array = xxtea_to_uint_array(key, 16, 0, &key_len);
if (!key_array)
{
if (!key_array) {
free(data_array);
return NULL;
}
......@@ -243,6 +231,14 @@ uint8_t * xxtea_decrypt_ubyte(const uint8_t * data, size_t len, const uint8_t *
return out;
}
// public functions
void * xxtea_encrypt(const void * data, size_t len, const void * key, size_t * out_len) {
FIXED_KEY
return xxtea_encrypt_ubyte(data, len, fixed_key, out_len);
}
void * xxtea_decrypt(const void * data, size_t len, const void * key, size_t * out_len) {
return xxtea_decrypt_ubyte(data, len, key, out_len);
FIXED_KEY
return xxtea_decrypt_ubyte(data, len, fixed_key, out_len);
}
xxtea.h
View file @ 6ba543bb
......@@ -2,13 +2,14 @@
| |
| xxtea.h |
| |
| XXTEA encryption algorithm library for Golang. |
| XXTEA encryption algorithm library for C. |
| |
| Encryption Algorithm Authors: |
| David J. Wheeler |
| Roger M. Needham |
| |
| Code Author: Ma Bingyao <mabingyao@gmail.com> |
| Code Authors: Chen fei <cf850118@163.com> |
| Ma Bingyao <mabingyao@gmail.com> |
| LastModified: Mar 3, 2015 |
| |
\**********************************************************/
......
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