ipad签约系统源码（ipad协议源码）

本文目录一览：

• 1、ipad 源码数字输出吗
• 2、如何在iPad或iPhone中的Safari“查看源代码”
• 3、如何用ipad pro签约合同
• 4、源码编辑器怎么在iPad上下载
• 5、求RSA/MD5数字签名系统源码！
• 6、如何用ipad pro签约合同？

ipad 源码数字输出吗

不。

iphoneipad不支持dsd源码输出，用的dop输出方式，最大只能dsd128。iPad是由苹果公司于2010年开始发布的平板电脑系列，定位介于苹果的智能手机iPhone和笔记本电脑产品之间，（屏幕中有4个虚拟程序固定栏）与iPhone布局一样，提供浏览网站、收发电子邮件、观看电子书、播放音频或视频、玩游戏等功能。

如何在iPad或iPhone中的Safari“查看源代码”

很不幸，iOS 中的 Safari 没有内置这个功能。你需要使用下边的方法，之后就可以在 iOS 上查看任意网站的源代码了。下面是设置方法：在iPad、iPhone 或 iPod touch 的 Safari 中将这个页面（或者任何页面）存为书签，并命名为“查看源代码”点按这里查看书签的 JavaScript 代码，并全选 – 拷贝在Safari 中点按书签图标，然后点“编辑”，点选第一步中保存的书签将第二步中拷贝的 JavaScript 代码粘贴到 URL 地址栏，点按“完成”保存这些更改现在，当你想要查看某个网页的源代码时，打开书签菜单并点选“查看源代码”，就能查看经过语法高亮处理以及链接可点处理的源代码了。

如何用ipad pro签约合同

自己手头有一台128G版的iPad Pro，目前已经使用了一个多月，使用频率中等。

经过这一段时间的使用，我的评价是：用iPad Pro办公体验不尽人意。 其问题在于Pro搭载的系统和应用生态。iPad Pro所搭载的系统，依旧是和普通iPad相同的iOS系统，用作

源码编辑器怎么在iPad上下载

源码编辑器在iPad浏览器里搜索即可下载。

源码编辑器是一款非常有趣的软件，这款软件非常适合小朋友使用，这款编程软件其实就是一个动画编辑软件，可以编辑人物各种事件、控制动作、外观、声音、画笔等等，非常容易上手还有助于益智。

1、无需编程功底。

2、使用简单，鼠标点击即可。

3、条理清晰，快速完成作品。

求RSA/MD5数字签名系统源码！

/* MD5lib.h - md5 library

*/

/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All

rights reserved.

RSA Data Security, Inc. makes no representations concerning either

the merchantability of this software or the suitability of this

software for any particular purpose. It is provided "as is"

without express or implied warranty of any kind.

These notices must be retained in any copies of any part of this

documentation and/or software.

*/

/* The following makes MD default to MD5 if it has not already been

defined with C compiler flags.

*/

#include stdio.h

#include time.h

#include string.h

#define MD 5

/* GLOBAL.H - RSAREF types and constants

*/

/* PROTOTYPES should be set to one if and only if the compiler supports

function argument prototyping.

The following makes PROTOTYPES default to 0 if it has not already

been defined with C compiler flags.

*/

#ifndef PROTOTYPES

#define PROTOTYPES 0

#endif

/* POINTER defines a generic pointer type */

typedef unsigned char *POINTER;

/* UINT2 defines a two byte word */

typedef unsigned short int UINT2;

/* UINT4 defines a four byte word */

typedef unsigned long int UINT4;

/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.

If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it

returns an empty list.

*/

#if PROTOTYPES

#define PROTO_LIST(list) list

#else

#define PROTO_LIST(list) ()

#endif

/* Length of test block, number of test blocks.

*/

#define TEST_BLOCK_LEN 1000

#define TEST_BLOCK_COUNT 1000

/* Constants for MD5Transform routine.

*/

#define S11 7

#define S12 12

#define S13 17

#define S14 22

#define S21 5

#define S22 9

#define S23 14

#define S24 20

#define S31 4

#define S32 11

#define S33 16

#define S34 23

#define S41 6

#define S42 10

#define S43 15

#define S44 21

char* MDString PROTO_LIST ((char *));

char* MDFile PROTO_LIST ((char *));

char* hmac_md5(char* text, char* key);

typedef struct {

UINT4 state[4]; /* state (ABCD) */

UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */

unsigned char buffer[64]; /* input buffer */

} MD5_CTX;

/*void MD5Init PROTO_LIST ((MD5_CTX *));

void MD5Update PROTO_LIST

((MD5_CTX *, unsigned char *, unsigned int));

void MD5Final PROTO_LIST ((unsigned char [16], MD5_CT X *));

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));

static void Encode PROTO_LIST

((unsigned char *, UINT4 *, unsigned int));

static void Decode PROTO_LIST

((UINT4 *, unsigned char *, unsigned int));

static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));

static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

*/

static unsigned char PADDING[64] = {

0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

};

/* F, G, H and I are basic MD5 functions.

*/

#define F(x, y, z) (((x) (y)) | ((~x) (z)))

#define G(x, y, z) (((x) (z)) | ((y) (~z)))

#define H(x, y, z) ((x) ^ (y) ^ (z))

#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.

*/

#define ROTATE_LEFT(x, n) (((x) (n)) | ((x) (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.

Rotation is separate from addition to prevent recomputation.

*/

#define FF(a, b, c, d, x, s, ac) {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}

#define GG(a, b, c, d, x, s, ac) {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}

#define HH(a, b, c, d, x, s, ac) {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}

#define II(a, b, c, d, x, s, ac) {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b);}

void MD5Init (MD5_CTX *context);

void MD5Update(MD5_CTX *context, unsigned char *input,unsigned int inputLen);

void MD5Final (unsigned char digest[16], MD5_CTX *context);

static void MD5Transform (UINT4 [4], unsigned char [64]) ;

static void Encode(unsigned char *, UINT4 *, unsigned int);

static void Decode (UINT4 *, unsigned char *, unsigned int);

static void MD5_memcpy(POINTER, POINTER, unsigned int);

static void MD5_memset(POINTER, int, unsigned int);

/* MD5 initialization. Begins an MD5 operation, writing a new context.

*/

void MD5Init (MD5_CTX *context)

/* context */

{

context-count[0] = context-count[1] = 0;

/* Load magic initialization constants.

*/

context-state[0] = 0x67452301;

context-state[1] = 0xefcdab89;

context-state[2] = 0x98badcfe;

context-state[3] = 0x10325476;

}

/* MD5 block update operation. Continues an MD5 message-digest

operation, processing another message block, and updating the

context.

*/

void MD5Update (MD5_CTX *context, unsigned char *input,unsigned int inputLen )

/* context */

/* input block */

/* length of input block */

{

unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */

index = (unsigned int)((context-count[0] 3) 0x3F);

/* Update number of bits */

if ((context-count[0] += ((UINT4)inputLen 3))

((UINT4)inputLen 3))

context-count[1]++;

context-count[1] += ((UINT4)inputLen 29);

partLen = 64 - index;

/* Transform as many times as possible.

*/

if (inputLen = partLen) {

MD5_memcpy

((POINTER)context-buffer[index], (POINTER)input, partLen);

MD5Transform (context-state, context-buffer);

for (i = partLen; i + 63 inputLen; i += 64)

MD5Transform (context-state, input[i]);

index = 0;

}

else

i = 0;

/* Buffer remaining input */

MD5_memcpy

((POINTER)context-buffer[index], (POINTER)input[i],

inputLen-i);

}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the

the message digest and zeroizing the context.

*/

void MD5Final (unsigned char digest[16], MD5_CTX *context)

/* message digest */

/* context */

{

unsigned char bits[8];

unsigned int index, padLen;

/* Save number of bits */

Encode (bits, context-count, 8);

/* Pad out to 56 mod 64.

*/

index = (unsigned int)((context-count[0] 3) 0x3f);

padLen = (index 56) ? (56 - index) : (120 - index);

MD5Update (context,(unsigned char*) PADDING, padLen);

/* Append length (before padding) */

MD5Update (context, bits, 8);

/* Store state in digest */

Encode (digest, context-state, 16);

/* Zeroize sensitive information.

*/

MD5_memset ((POINTER)context, 0, sizeof (*context));

}

/* MD5 basic transformation. Transforms state based on block.

*/

static void MD5Transform (UINT4 state[4],

unsigned char block[64])

{

int i=0;

UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

Decode (x, block, 64);

/* Round 1 */

FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */

FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */

FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */

FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */

FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */

FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */

FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */

FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */

FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */

FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */

FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */

FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */

FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */

FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */

FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */

FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

/* Round 2 */

GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */

GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */

GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */

GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */

GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */

GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */

GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */

GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */

GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */

GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */

GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */

GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */

GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */

GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */

GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */

GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

/* Round 3 */

HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */

HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */

HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */

HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */

HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */

HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */

HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */

HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */

HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */

HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */

HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */

HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */

HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */

HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */

HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */

HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

/* Round 4 */

II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */

II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */

II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */

II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */

II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */

II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */

II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */

II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */

II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */

II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */

II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */

II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */

II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */

II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */

II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */

II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

state[0] += a;

state[1] += b;

state[2] += c;

state[3] += d;

/* Zeroize sensitive information.

*/

MD5_memset ((POINTER)x, 0, sizeof (x));

}

/* Encodes input (UINT4) into output (unsigned char). Assumes len is

a multiple of 4.

*/

static void Encode (unsigned char *output,

UINT4 *input,

unsigned int len)

{

unsigned int i, j;

for (i = 0, j = 0; j len; i++, j += 4) {

output[j] = (unsigned char)(input[i] 0xff);

output[j+1] = (unsigned char)((input[i] 8) 0xff);

output[j+2] = (unsigned char)((input[i] 16) 0xff);

output[j+3] = (unsigned char)((input[i] 24) 0xff);

}

}

/* Decodes input (unsigned char) into output (UINT4). Assumes len is

a multiple of 4.

*/

static void Decode (UINT4 *output,

unsigned char *input,

unsigned int len)

{

unsigned int i, j;

for (i = 0, j = 0; j len; i++, j += 4)

output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) 8) |

(((UINT4)input[j+2]) 16) | (((UINT4)input[j+3]) 24);

}

/* Note: Replace "for loop" with standard memcpy if possible.

*/

static void MD5_memcpy (POINTER output,

POINTER input,

unsigned int len)

{

unsigned int i;

for (i = 0; i len; i++)

output[i] = input[i];

}

/* Note: Replace "for loop" with standard memset if possible.

*/

static void MD5_memset (POINTER output,

int value,

unsigned int len)

{

unsigned int i;

for (i = 0; i len; i++)

((char *)output)[i] = (char)value;

}

/* Digests a string and prints the result.

*/

char* MDString (char *string)

{

MD5_CTX context;

unsigned char digest[16];

char output1[32];

static char output[33]={""};

unsigned int len = strlen (string);

int i;

MD5Init (context);

MD5Update (context, (unsigned char*)string, len);

MD5Final (digest, context);

for (i = 0; i 16; i++)

{sprintf((output1[2*i]),"%02x",(unsigned char)digest[i]);

sprintf((output1[2*i+1]),"%02x",(unsigned char)(digest[i]4));

}

for(i=0;i32;i++)

output[i]=output1[i];

return output;

}

/* Digests a file and prints the result.

*/

char* MDFile (char *filename)

{ static char output[33]={""};

FILE *file;

MD5_CTX context;

int len;

unsigned char buffer[1024], digest[16];

int i;

char output1[32];

if ((file = fopen (filename, "rb")) == NULL)

{ printf ("%s can't be openedn", filename);

return 0;

}

else {

MD5Init (context);

while (len = fread (buffer, 1, 1024, file))

MD5Update (context, buffer, len);

MD5Final (digest, context);

fclose (file);

for (i = 0; i 16; i++)

{sprintf((output1[2*i]),"%02x",(unsigned char)digest[i]);

sprintf((output1[2*i+1]),"%02x",(unsigned char)(digest[i]4));

}

for(i=0;i32;i++)

output[i]=output1[i];

return output;

}

}

char* hmac_md5(char* text,char* key)

{

char digest[16];

char output1[32];

static char output[33]={""};

MD5_CTX context;

unsigned char k_ipad[65]; /* inner padding -

* key XORd with ipad

*/

unsigned char k_opad[65]; /* outer padding -

* key XORd with opad

*/

unsigned char tk[16];

int i;

int text_len = strlen (text);

int key_len=strlen(key);

/* if key is longer than 64 bytes reset it to key=MD5(key) */

if (key_len 64) {

MD5_CTX tctx;

MD5Init(tctx);

MD5Update(tctx,(unsigned char*) key, key_len);

MD5Final(tk, tctx);

key = (char*)tk;

key_len = 16;

}

/*

* the HMAC_MD5 transform looks like:

*

* MD5(K XOR opad, MD5(K XOR ipad, text))

*

* where K is an n byte key

* ipad is the byte 0x36 repeated 64 times

* opad is the byte 0x5c repeated 64 times

* and text is the data being protected

*/

/* start out by storing key in pads */

/*bzero( k_ipad, sizeof k_ipad);

bzero( k_opad, sizeof k_opad);

*/

for(i=0;i65;i++)

k_ipad[i]=(unsigned char)0;

for(i=0;i65;i++)

k_opad[i]=(unsigned char)0;

/*bcopy( key, k_ipad, key_len);

bcopy( key, k_opad, key_len);

*/

for(i=0;ikey_len;i++)

{k_ipad[i]=(unsigned char)key[i];

k_opad[i]=(unsigned char)key[i];

}

/* XOR key with ipad and opad values */

for (i=0; i64; i++) {

k_ipad[i] ^= 0x36;

k_opad[i] ^= 0x5c;

}

/*

* perform inner MD5

*/

MD5Init(context); /* init context for 1st

* pass */

MD5Update(context, k_ipad, 64); /* start with inner pad */

MD5Update(context, (unsigned char*)text, text_len); /* then text of datagram

*/

MD5Final((unsigned char*)digest, context); /* finish up 1st pass */

/*

* perform outer MD5

*/

MD5Init(context); /* init context for 2nd

* pass */

MD5Update(context, k_opad, 64); /* start with outer pad */

MD5Update(context,(unsigned char*) digest, 16); /* then results of 1st

* hash */

MD5Final((unsigned char*)digest, context); /* finish up 2nd pass */

for (i = 0; i 16; i++)

{sprintf((output1[2*i]),"%02x",(unsigned char)digest[i]);

sprintf((output1[2*i+1]),"%02x",(unsigned char)(digest[i]4));

}

for(i=0;i32;i++)

output[i]=output1[i];

return output;

}

上面是MD5用C来实现的方法

如何用ipad pro签约合同？

能够通过电子设备签名完成合同签约，那这样的合同一定是一份电子合同。

电子合同的签约涉及几个方面：

1、合同是电子档的（如何保障电子文档不被篡改，尤其是签约后）

2、电子设备进行的签名，尤其是手写签名，如何确保是本人签署，司法效力如何体现？

基于以上问题，所以我们要找一家有技术、有资质的服务商，进行合同的加密、电子签名的数据制作！

电子合同行业现状

当前合法电子合同，几乎都是采用区块链加密传输存储，确保合同的内容不会被篡改。除了合同本身的存证以外，就是电子签名签章的技术有不同。

电子签名方式主要有两大类：数字证书方式和生物特征识别方式。

前者需要U盾、证书等物理介质来实现身份识别，应用场景有所局限，在不特定人群面对面签署场景以及需要留下文书类证据的场景中，数字证书方式并不能很好的实现其无纸化签署目的，同时对于U盾等物理硬件的依赖增加使用了成本。

静态的身份识别不能表达意愿

生物特征识别技术主要分为两类，静态生物识别方式以指纹、面部识别为代表，因其客观存在的属性，能够表达“签到”的行为而无法表达“确认”的行为；

而笔迹作为一种动态行为生物特征，具有主动意愿表达优势，从而成为电子签名生物特征身份识别及行为确认的理想方式。对应到电子签名法，就是能表达签名只由本人控制的。

手写原笔迹电子签名

基于传统签名的原理，结合电子设备采集留样保存数据的优点，提出的签名电子化应用方案。

相比传统笔迹鉴定，强调笔迹特征，电子签名受书写载体、书写的工具的影响，很多笔迹特征会发生变化。从鉴定角度来讲，手写的笔迹数据尤为重要，在司法层面更有价值。

电子合同/文件签名的使用步骤

1、经过合同主体人双方协商后认可才拟定合同，并确定合同条款无违法违规的情况。

2、合同文档上传到合同发起人的第三方签名软件后台。一般有合同发起方决定采用哪个平台，切记选择合法有资质的。

3、设置合同的相关签署人，在这里需要合同签署双方自行验证身份，避免被骗。

4、合同发起签署，首先由发起人自行签名、验证身份、加盖电子公章(如有)。

5、由合同另一方通过二维码、链接、小程序等，查收合同并同步签名、验证身份、加盖电子公章(如有)。

6、合同签署完毕，由第三方签名软件存证系统保存，合同双方可在各自的签名软件后台下载电子合同存储。

7、合同纠纷的情况下，可申请司法鉴定获取合同鉴定意见书，作为法院对合同的判决证据。