rsa在线加密解密
① 如何利用OpenSSL库进行RSA加密和解密
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<openssl/rsa.h>
#include<openssl/engine.h>
intmain(intargc,char*argv[])
{
printf("openssl_testbegin ");
RSA*rsa=NULL;
charoriginstr[]="hello ";//这是我们需要加密的原始数据
//allocateRSAstructure，首先需要申请一个RSA结构题用于存放生成的公私钥，这里rsa就是这个结构体的指针
rsa=RSA_new();
if(rsa==NULL)
{
printf("RSA_newfailed ");
return-1;
}
//generateRSAkeys
BIGNUM*exponent;
exponent=BN_new();//生成RSA公私钥之前需要选择一个奇数（oddnumber）来用于生成公私钥
if(exponent==NULL)
{
printf("BN_newfailed ");
gotoFAIL1;
}
if(0==BN_set_word(exponent,65537))//这里选择奇数65537
{
printf("BN_set_wordfailed ");
gotoFAIL1;
}
//这里molus的长度选择4096，小于1024的molus长度都是不安全的，容易被破解
if(0==RSA_generate_key_ex(rsa,4096,exponent,NULL))
{
printf("RSA_generate_key_exfailed ");
gotoFAIL;
}
char*cipherstr=NULL;
//分配一段空间用于存储加密后的数据，这个空间的大小由RSA_size函数根据rsa算出
cipherstr=malloc(RSA_size(rsa));
if(cipherstr==NULL)
{
printf("malloccipherstrbuffailed ");
gotoFAIL1;
}
//下面是实际的加密过程，最后一个参数paddingtype，有以下几种。
/*
RSA_PKCS1_PADDINGPKCS#1v1.5padding..
RSA_PKCS1_OAEP_PADDING
EME-OAEPasdefinedinPKCS#1v2.0withSHA-1,..
RSA_SSLV23_PADDING
PKCS#1v1.5paddingwithanSSL-.
RSA_NO_PADDING
RawRSAencryption.ntheapplicationcode..
*/
//这里首先用公钥进行加密，选择了RSA_PKCS1_PADDING
if(RSA_size(rsa)!=RSA_public_encrypt(strlen(originstr)+1,originstr,cipherstr,rsa,RSA_PKCS1_PADDING))
{
printf("encryptionfailure ");
gotoFAIL2;
}
printf("theoriginalstringis%s ",originstr);
printf("theencryptedstringis%s ",cipherstr);
//Now,let'
//下面来用私钥解密，首先需要一个buffer用于存储解密后的数据，这个buffer的长度要足够（小于RSA_size(rsa)）
//这里分配一个长度为250的字符数组，应该是够用的。
chardecrypted_str[250];
intdecrypted_len;
if(-1=(decrypted_len=RSA_private_decrypt(256,cipherstr,decrypted_str,rsa,RSA_PKCS1_PADDING)))
{
printf("decryptionfailure ");
gotoFAIL2;
}
printf("decryptedstringlengthis%d,decryped_stris%s ",decrypted_len,decrypted_str);
FAIL2:
free(cipherstr);
FAIL1:
BN_free(exponent);
FAIL:
RSA_free(rsa);
return0;
}
以上是源代码，下面使用下面的编译命令在源码所在路径下生成可执行文件
gcc *.c -o openssl_test -lcrypto -ldl -L/usr/local/ssl/lib -I/usr/local/ssl/include
其中，-lcrypto和-ldl是必须的，前者是OpenSSL中的加密算法库，后者是用于成功加载动态库。
② vb.net中实现rsa加密解密 急！急！
我觉得你的并不是RSA加密解密算法。
在.net的有一个System.Security.Cryptography的命名空间，里面有一RSACryptoServiceProvider的类用来对byte进行RSA加密解密。
具体例子如下：
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes("Data to Encrypt");
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(dataToEncrypt,RSA.ExportParameters(false), false);
//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(encryptedData,RSA.ExportParameters(true), false);
//Display the decrypted plaintext to the console.
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
}
catch(ArgumentNullException)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine("Encryption failed.");
}
}
static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA.ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo,bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
//to include the private key information.
RSA.ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
}
[Visual Basic]
Try
'Create a new RSACryptoServiceProvider object.
Dim RSA As New RSACryptoServiceProvider()
'Export the key information to an RSAParameters object.
'Pass false to export the public key information or pass
'true to export public and private key information.
Dim RSAParams As RSAParameters = RSA.ExportParameters(False)
Catch e As CryptographicException
'Catch this exception in case the encryption did
'not succeed.
Console.WriteLine(e.Message)
End Try
[C#]
try
{
//Create a new RSACryptoServiceProvider object.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Export the key information to an RSAParameters object.
//Pass false to export the public key information or pass
//true to export public and private key information.
RSAParameters RSAParams = RSA.ExportParameters(false);
}
catch(CryptographicException e)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(e.Message);
}
③ 如何使用RSA签名给给信息加密和解密
【实例下载】本文介绍RSA2加密与解密，RSA2是RSA的加强版本，在密钥长度上采用2048, RSA2比RSA更安全，更可靠, 本人的另一篇文章RSA已经发表，有想了解的可以点开下面的RSA文章
④ 求正确的RSA加密解密算法C语言的，多谢。
RSA算法它是第一个既能用于数据加密也能用于数字签名的算法。它易于理解和操作，也很流行。算法的名字以发明者的名字命名：RonRivest,AdiShamir和LeonardAdleman。但RSA的安全性一直未能得到理论上的证明。它经历了各种攻击，至今未被完全攻破。一、RSA算法:首先,找出三个数,p,q,r,其中p,q是两个相异的质数,r是与(p-1)(q-1)互质的数p,q,r这三个数便是privatekey接着,找出m,使得rm==1mod(p-1)(q-1)这个m一定存在,因为r与(p-1)(q-1)互质,用辗转相除法就可以得到了再来,计算n=pqm,n这两个数便是publickey编码过程是,若资料为a,将其看成是一个大整数,假设a=n的话,就将a表成s进位(s因为rm==1mod(p-1)(q-1),所以rm=k(p-1)(q-1)+1,其中k是整数因为在molo中是preserve乘法的(x==ymodzan==vmodz=>xu==yvmodz),所以,c==b^r==(a^m)^r==a^(rm)==a^(k(p-1)(q-1)+1)modpq1.如果a不是p的倍数,也不是q的倍数时,则a^(p-1)==1modp(费马小定理)=>a^(k(p-1)(q-1))==1modpa^(q-1)==1modq(费马小定理)=>a^(k(p-1)(q-1))==1modq所以p,q均能整除a^(k(p-1)(q-1))-1=>pq|a^(k(p-1)(q-1))-1即a^(k(p-1)(q-1))==1modpq=>c==a^(k(p-1)(q-1)+1)==amodpq2.如果a是p的倍数,但不是q的倍数时,则a^(q-1)==1modq(费马小定理)=>a^(k(p-1)(q-1))==1modq=>c==a^(k(p-1)(q-1)+1)==amodq=>q|c-a因p|a=>c==a^(k(p-1)(q-1)+1)==0modp=>p|c-a所以,pq|c-a=>c==amodpq3.如果a是q的倍数,但不是p的倍数时,证明同上4.如果a同时是p和q的倍数时,则pq|a=>c==a^(k(p-1)(q-1)+1)==0modpq=>pq|c-a=>c==amodpqQ.E.D.这个定理说明a经过编码为b再经过解码为c时,a==cmodn(n=pq)但我们在做编码解码时,限制0intcandp(inta,intb,intc){intr=1;b=b+1;while(b!=1){r=r*a;r=r%c;b--;}printf("%d\n",r);returnr;}voidmain(){intp,q,e,d,m,n,t,c,r;chars;printf("pleaseinputthep,q:");scanf("%d%d",&p,&q);n=p*q;printf("thenis%3d\n",n);t=(p-1)*(q-1);printf("thetis%3d\n",t);printf("pleaseinputthee:");scanf("%d",&e);if(et){printf("eiserror,pleaseinputagain:");scanf("%d",&e);}d=1;while(((e*d)%t)!=1)d++;printf("thencaculateoutthatthedis%d\n",d);printf("thecipherpleaseinput1\n");printf("theplainpleaseinput2\n");scanf("%d",&r);switch(r){case1:printf("inputthem:");/*输入要加密的明文数字*/scanf("%d",&m);c=candp(m,e,n);printf("thecipheris%d\n",c);break;case2:printf("inputthec:");/*输入要解密的密文数字*/scanf("%d",&c);m=candp(c,d,n);printf("thecipheris%d\n",m);break;}getch();}
⑤ 用c#实现Rsa加密和解密
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace Microsoft.Samples.Security.PublicKey
{
class App
{
// Main entry point
static void Main(string[] args)
{
// Instantiate 3 People for example. See the Person class below
Person alice = new Person("Alice");
Person bob = new Person("Bob");
Person steve = new Person("Steve");
// Messages that will exchanged. See CipherMessage class below
CipherMessage aliceMessage;
CipherMessage bobMessage;
CipherMessage steveMessage;
// Example of encrypting/decrypting your own message
Console.WriteLine("Encrypting/Decrypting Your Own Message");
Console.WriteLine("-----------------------------------------");
// Alice encrypts a message using her own public key
aliceMessage = alice.EncryptMessage("Alice wrote this message");
// then using her private key can decrypt the message
alice.DecryptMessage(aliceMessage);
// Example of Exchanging Keys and Messages
Console.WriteLine();
Console.WriteLine("Exchanging Keys and Messages");
Console.WriteLine("-----------------------------------------");
// Alice Sends a of her public key to Bob and Steve
bob.GetPublicKey(alice);
steve.GetPublicKey(alice);
// Bob and Steve both encrypt messages to send to Alice
bobMessage = bob.EncryptMessage("Hi Alice! - Bob.");
steveMessage = steve.EncryptMessage("How are you? - Steve");
// Alice can decrypt and read both messages
alice.DecryptMessage(bobMessage);
alice.DecryptMessage(steveMessage);
Console.WriteLine();
Console.WriteLine("Private Key required to read the messages");
Console.WriteLine("-----------------------------------------");
// Steve cannot read the message that Bob encrypted
steve.DecryptMessage(bobMessage);
// Not even Bob can use the Message he encrypted for Alice.
// The RSA private key is required to decrypt the RS2 key used
// in the decryption.
bob.DecryptMessage(bobMessage);
} // method Main
} // class App
class CipherMessage
{
public byte[] cipherBytes; // RC2 encrypted message text
public byte[] rc2Key; // RSA encrypted rc2 key
public byte[] rc2IV; // RC2 initialization vector
}
class Person
{
private RSACryptoServiceProvider rsa;
private RC2CryptoServiceProvider rc2;
private string name;
// Maximum key size for the RC2 algorithm
const int keySize = 128;
// Person constructor
public Person(string p_Name)
{
rsa = new RSACryptoServiceProvider();
rc2 = new RC2CryptoServiceProvider();
rc2.KeySize = keySize;
name = p_Name;
}
// Used to send the rsa public key parameters
public RSAParameters SendPublicKey()
{
RSAParameters result = new RSAParameters();
try
{
result = rsa.ExportParameters(false);
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
return result;
}
// Used to import the rsa public key parameters
public void GetPublicKey(Person receiver)
{
try
{
rsa.ImportParameters(receiver.SendPublicKey());
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
}
public CipherMessage EncryptMessage(string text)
{
// Convert string to a byte array
CipherMessage message = new CipherMessage();
byte[] plainBytes = Encoding.Unicode.GetBytes(text.ToCharArray());
// A new key and iv are generated for every message
rc2.GenerateKey();
rc2.GenerateIV();
// The rc2 initialization doesnt need to be encrypted, but will
// be used in conjunction with the key to decrypt the message.
message.rc2IV = rc2.IV;
try
{
// Encrypt the RC2 key using RSA encryption
message.rc2Key = rsa.Encrypt(rc2.Key, false);
}
catch (CryptographicException e)
{
// The High Encryption Pack is required to run this sample
// because we are using a 128-bit key. See the readme for
// additional information.
Console.WriteLine("Encryption Failed. Ensure that the" +
" High Encryption Pack is installed.");
Console.WriteLine("Error Message: " + e.Message);
Environment.Exit(0);
}
// Encrypt the Text Message using RC2 (Symmetric algorithm)
ICryptoTransform sse = rc2.CreateEncryptor();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, sse, CryptoStreamMode.Write);
try
{
cs.Write(plainBytes, 0, plainBytes.Length);
cs.FlushFinalBlock();
message.cipherBytes = ms.ToArray();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
return message;
} // method EncryptMessage
public void DecryptMessage(CipherMessage message)
{
// Get the RC2 Key and Initialization Vector
rc2.IV = message.rc2IV;
try
{
// Try decrypting the rc2 key
rc2.Key = rsa.Decrypt(message.rc2Key, false);
}
catch (CryptographicException e)
{
Console.WriteLine("Decryption Failed: " + e.Message);
return;
}
ICryptoTransform ssd = rc2.CreateDecryptor();
// Put the encrypted message in a memorystream
MemoryStream ms = new MemoryStream(message.cipherBytes);
// the CryptoStream will read cipher text from the MemoryStream
CryptoStream cs = new CryptoStream(ms, ssd, CryptoStreamMode.Read);
byte[] initialText = new Byte[message.cipherBytes.Length];
try
{
// Decrypt the message and store in byte array
cs.Read(initialText, 0, initialText.Length);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
// Display the message received
Console.WriteLine(name + " received the following message:");
Console.WriteLine(" " + Encoding.Unicode.GetString(initialText));
} // method DecryptMessage
} // class Person
} // namespace PublicKey
⑥ C# Rsa加密解密
网上给出的rsa加密的源码，希望可以帮到你：
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace Microsoft.Samples.Security.PublicKey
{
class App
{
// Main entry point
static void Main(string[] args)
{
// Instantiate 3 People for example. See the Person class below
Person alice = new Person("Alice");
Person bob = new Person("Bob");
Person steve = new Person("Steve");
// Messages that will exchanged. See CipherMessage class below
CipherMessage aliceMessage;
CipherMessage bobMessage;
CipherMessage steveMessage;
// Example of encrypting/decrypting your own message
Console.WriteLine("Encrypting/Decrypting Your Own Message");
Console.WriteLine("-----------------------------------------");
// Alice encrypts a message using her own public key
aliceMessage = alice.EncryptMessage("Alice wrote this message");
// then using her private key can decrypt the message
alice.DecryptMessage(aliceMessage);
// Example of Exchanging Keys and Messages
Console.WriteLine();
Console.WriteLine("Exchanging Keys and Messages");
Console.WriteLine("-----------------------------------------");
// Alice Sends a of her public key to Bob and Steve
bob.GetPublicKey(alice);
steve.GetPublicKey(alice);
// Bob and Steve both encrypt messages to send to Alice
bobMessage = bob.EncryptMessage("Hi Alice! - Bob.");
steveMessage = steve.EncryptMessage("How are you? - Steve");
// Alice can decrypt and read both messages
alice.DecryptMessage(bobMessage);
alice.DecryptMessage(steveMessage);
Console.WriteLine();
Console.WriteLine("Private Key required to read the messages");
Console.WriteLine("-----------------------------------------");
// Steve cannot read the message that Bob encrypted
steve.DecryptMessage(bobMessage);
// Not even Bob can use the Message he encrypted for Alice.
// The RSA private key is required to decrypt the RS2 key used
// in the decryption.
bob.DecryptMessage(bobMessage);
} // method Main
} // class App
class CipherMessage
{
public byte[] cipherBytes; // RC2 encrypted message text
public byte[] rc2Key; // RSA encrypted rc2 key
public byte[] rc2IV; // RC2 initialization vector
}
class Person
{
private RSACryptoServiceProvider rsa;
private RC2CryptoServiceProvider rc2;
private string name;
// Maximum key size for the RC2 algorithm
const int keySize = 128;
// Person constructor
public Person(string p_Name)
{
rsa = new RSACryptoServiceProvider();
rc2 = new RC2CryptoServiceProvider();
rc2.KeySize = keySize;
name = p_Name;
}
// Used to send the rsa public key parameters
public RSAParameters SendPublicKey()
{
RSAParameters result = new RSAParameters();
try
{
result = rsa.ExportParameters(false);
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
return result;
}
// Used to import the rsa public key parameters
public void GetPublicKey(Person receiver)
{
try
{
rsa.ImportParameters(receiver.SendPublicKey());
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
}
}
public CipherMessage EncryptMessage(string text)
{
// Convert string to a byte array
CipherMessage message = new CipherMessage();
byte[] plainBytes = Encoding.Unicode.GetBytes(text.ToCharArray());
// A new key and iv are generated for every message
rc2.GenerateKey();
rc2.GenerateIV();
// The rc2 initialization doesnt need to be encrypted, but will
// be used in conjunction with the key to decrypt the message.
message.rc2IV = rc2.IV;
try
{
// Encrypt the RC2 key using RSA encryption
message.rc2Key = rsa.Encrypt(rc2.Key, false);
}
catch (CryptographicException e)
{
// The High Encryption Pack is required to run this sample
// because we are using a 128-bit key. See the readme for
// additional information.
Console.WriteLine("Encryption Failed. Ensure that the" +
" High Encryption Pack is installed.");
Console.WriteLine("Error Message: " + e.Message);
Environment.Exit(0);
}
// Encrypt the Text Message using RC2 (Symmetric algorithm)
ICryptoTransform sse = rc2.CreateEncryptor();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, sse, CryptoStreamMode.Write);
try
{
cs.Write(plainBytes, 0, plainBytes.Length);
cs.FlushFinalBlock();
message.cipherBytes = ms.ToArray();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
return message;
} // method EncryptMessage
public void DecryptMessage(CipherMessage message)
{
// Get the RC2 Key and Initialization Vector
rc2.IV = message.rc2IV;
try
{
// Try decrypting the rc2 key
rc2.Key = rsa.Decrypt(message.rc2Key, false);
}
catch (CryptographicException e)
{
Console.WriteLine("Decryption Failed: " + e.Message);
return;
}
ICryptoTransform ssd = rc2.CreateDecryptor();
// Put the encrypted message in a memorystream
MemoryStream ms = new MemoryStream(message.cipherBytes);
// the CryptoStream will read cipher text from the MemoryStream
CryptoStream cs = new CryptoStream(ms, ssd, CryptoStreamMode.Read);
byte[] initialText = new Byte[message.cipherBytes.Length];
try
{
// Decrypt the message and store in byte array
cs.Read(initialText, 0, initialText.Length);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
ms.Close();
cs.Close();
}
// Display the message received
Console.WriteLine(name + " received the following message:");
Console.WriteLine(" " + Encoding.Unicode.GetString(initialText));
} // method DecryptMessage
} // class Person
} // namespace PublicKey
⑦ 哪位大神能写一个RSA算法的文件加密解密的C程序给我，可以对文件进行加密和解密，在线等，急！！！！
看看这个吧
http://www.coders-hub.com/2013/04/c-code-to-encrypt-and-decrypt-message.html#.VmPqwvlVhP4