rsa源碼
㈠ RSA演算法c語言源代碼有哪位大哥大姐有啊,小妹我先謝過了!!!!!!!
string ls_str
string sn = ""
ulong lul_temp
ulong lul_x
ulong lul_x0
ulong lul_x1
integer i
integer li_d
integer li_n
li_d = 7
li_n = 33
ls_str = trim(id) //id 為序列號
do until ls_str = ""
if left(ls_str,1) = "2" then
lul_temp = integer(mid(ls_str,2,2))
ls_str = right(ls_str,len(ls_str) - 3)
else
lul_temp = integer(mid(ls_str,2,1))
ls_str = right(ls_str,len(ls_str) - 2)
end if
lul_x0 = 1
lul_x1 = 1
for i = 1 to 4
lul_x0 = lul_x0 * lul_temp
next
lul_x0 = mod(lul_x0,33)
for i = 1 to li_d - 4
lul_x1 = lul_x1 * lul_temp
next
lul_x1 = mod(lul_x1,33)
lul_x = mod(lul_x0 * lul_x1,33)
sn = trim(sn) + string(lul_x)
loop
㈡ 如何用C++實現RSA演算法
RSA演算法介紹及java實現,其實java和c++差不多,參考一下吧
<一>基礎
RSA演算法非常簡單,概述如下:
找兩素數p和q
取n=p*q
取t=(p-1)*(q-1)
取任何一個數e,要求滿足e<t並且e與t互素(就是最大公因數為1)
取d*e%t==1
這樣最終得到三個數: n d e
設消息為數M (M <n)
設c=(M**d)%n就得到了加密後的消息c
設m=(c**e)%n則 m == M,從而完成對c的解密。
註:**表示次方,上面兩式中的d和e可以互換。
在對稱加密中:
n d兩個數構成公鑰,可以告訴別人;
n e兩個數構成私鑰,e自己保留,不讓任何人知道。
給別人發送的信息使用e加密,只要別人能用d解開就證明信息是由你發送的,構成了簽名機制。
別人給你發送信息時使用d加密,這樣只有擁有e的你能夠對其解密。
rsa的安全性在於對於一個大數n,沒有有效的方法能夠將其分解
從而在已知n d的情況下無法獲得e;同樣在已知n e的情況下無法
求得d。
<二>實踐
接下來我們來一個實踐,看看實際的操作:
找兩個素數:
p=47
q=59
這樣
n=p*q=2773
t=(p-1)*(q-1)=2668
取e=63,滿足e<t並且e和t互素
用perl簡單窮舉可以獲得滿主 e*d%t ==1的數d:
C:\Temp>perl -e "foreach $i (1..9999){ print($i),last if $i*63%2668==1 }"
847
即d=847
最終我們獲得關鍵的
n=2773
d=847
e=63
取消息M=244我們看看
加密:
c=M**d%n = 244**847%2773
用perl的大數計算來算一下:
C:\Temp>perl -Mbigint -e "print 244**847%2773"
465
即用d對M加密後獲得加密信息c=465
解密:
我們可以用e來對加密後的c進行解密,還原M:
m=c**e%n=465**63%2773 :
C:\Temp>perl -Mbigint -e "print 465**63%2773"
244
即用e對c解密後獲得m=244 , 該值和原始信息M相等。
<三>字元串加密
把上面的過程集成一下我們就能實現一個對字元串加密解密的示例了。
每次取字元串中的一個字元的ascii值作為M進行計算,其輸出為加密後16進制
的數的字元串形式,按3位元組表示,如01F
代碼如下:
#!/usr/bin/perl -w
#RSA 計算過程學習程序編寫的測試程序
#watercloud 2003-8-12
#
use strict;
use Math::BigInt;
my %RSA_CORE = (n=>2773,e=>63,d=>847); #p=47,q=59
my $N=new Math::BigInt($RSA_CORE{n});
my $E=new Math::BigInt($RSA_CORE{e});
my $D=new Math::BigInt($RSA_CORE{d});
print "N=$N D=$D E=$E\n";
sub RSA_ENCRYPT
{
my $r_mess = shift @_;
my ($c,$i,$M,$C,$cmess);
for($i=0;$i < length($$r_mess);$i++)
{
$c=ord(substr($$r_mess,$i,1));
$M=Math::BigInt->new($c);
$C=$M->(); $C->bmodpow($D,$N);
$c=sprintf "%03X",$C;
$cmess.=$c;
}
return \$cmess;
}
sub RSA_DECRYPT
{
my $r_mess = shift @_;
my ($c,$i,$M,$C,$dmess);
for($i=0;$i < length($$r_mess);$i+=3)
{
$c=substr($$r_mess,$i,3);
$c=hex($c);
$M=Math::BigInt->new($c);
$C=$M->(); $C->bmodpow($E,$N);
$c=chr($C);
$dmess.=$c;
}
return \$dmess;
}
my $mess="RSA 娃哈哈哈~~~";
$mess=$ARGV[0] if @ARGV >= 1;
print "原始串:",$mess,"\n";
my $r_cmess = RSA_ENCRYPT(\$mess);
print "加密串:",$$r_cmess,"\n";
my $r_dmess = RSA_DECRYPT($r_cmess);
print "解密串:",$$r_dmess,"\n";
#EOF
測試一下:
C:\Temp>perl rsa-test.pl
N=2773 D=847 E=63
原始串:RSA 娃哈哈哈~~~
加密串:
解密串:RSA 娃哈哈哈~~~
C:\Temp>perl rsa-test.pl 安全焦點(xfocus)
N=2773 D=847 E=63
原始串:安全焦點(xfocus)
加密串:
解密串:安全焦點(xfocus)
<四>提高
前面已經提到,rsa的安全來源於n足夠大,我們測試中使用的n是非常小的,根本不能保障安全性,
我們可以通過RSAKit、RSATool之類的工具獲得足夠大的N 及D E。
通過工具,我們獲得1024位的N及D E來測試一下:
n=EC3A85F5005D
4C2013433B383B
A50E114705D7E2
BC511951
d=0x10001
e=DD28C523C2995
47B77324E66AFF2
789BD782A592D2B
1965
設原始信息
M=
完成這么大數字的計算依賴於大數運算庫,用perl來運算非常簡單:
A) 用d對M進行加密如下:
c=M**d%n :
C:\Temp>perl -Mbigint -e " $x=Math::BigInt->bmodpow(0x11111111111122222222222233
333333333, 0x10001,
D55EDBC4F0
6E37108DD6
);print $x->as_hex"
b73d2576bd
47715caa6b
d59ea89b91
f1834580c3f6d90898
即用d對M加密後信息為:
c=b73d2576bd
47715caa6b
d59ea89b91
f1834580c3f6d90898
B) 用e對c進行解密如下:
m=c**e%n :
C:\Temp>perl -Mbigint -e " $x=Math::BigInt->bmodpow(0x17b287be418c69ecd7c39227ab
5aa1d99ef3
0cb4764414
, 0xE760A
3C29954C5D
7324E66AFF
2789BD782A
592D2B1965, CD15F90
4F017F9CCF
DD60438941
);print $x->as_hex"
(我的P4 1.6G的機器上計算了約5秒鍾)
得到用e解密後的m= == M
C) RSA通常的實現
RSA簡潔幽雅,但計算速度比較慢,通常加密中並不是直接使用RSA 來對所有的信息進行加密,
最常見的情況是隨機產生一個對稱加密的密鑰,然後使用對稱加密演算法對信息加密,之後用
RSA對剛才的加密密鑰進行加密。
最後需要說明的是,當前小於1024位的N已經被證明是不安全的
自己使用中不要使用小於1024位的RSA,最好使用2048位的。
----------------------------------------------------------
一個簡單的RSA演算法實現JAVA源代碼:
filename:RSA.java
/*
* Created on Mar 3, 2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
import java.math.BigInteger;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import java.util.StringTokenizer;
/**
* @author Steve
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class RSA {
/**
* BigInteger.ZERO
*/
private static final BigInteger ZERO = BigInteger.ZERO;
/**
* BigInteger.ONE
*/
private static final BigInteger ONE = BigInteger.ONE;
/**
* Pseudo BigInteger.TWO
*/
private static final BigInteger TWO = new BigInteger("2");
private BigInteger myKey;
private BigInteger myMod;
private int blockSize;
public RSA (BigInteger key, BigInteger n, int b) {
myKey = key;
myMod = n;
blockSize = b;
}
public void encodeFile (String filename) {
byte[] bytes = new byte[blockSize / 8 + 1];
byte[] temp;
int tempLen;
InputStream is = null;
FileWriter writer = null;
try {
is = new FileInputStream(filename);
writer = new FileWriter(filename + ".enc");
}
catch (FileNotFoundException e1){
System.out.println("File not found: " + filename);
}
catch (IOException e1){
System.out.println("File not found: " + filename + ".enc");
}
/**
* Write encoded message to 'filename'.enc
*/
try {
while ((tempLen = is.read(bytes, 1, blockSize / 8)) > 0) {
for (int i = tempLen + 1; i < bytes.length; ++i) {
bytes[i] = 0;
}
writer.write(encodeDecode(new BigInteger(bytes)) + " ");
}
}
catch (IOException e1) {
System.out.println("error writing to file");
}
/**
* Close input stream and file writer
*/
try {
is.close();
writer.close();
}
catch (IOException e1) {
System.out.println("Error closing file.");
}
}
public void decodeFile (String filename) {
FileReader reader = null;
OutputStream os = null;
try {
reader = new FileReader(filename);
os = new FileOutputStream(filename.replaceAll(".enc", ".dec"));
}
catch (FileNotFoundException e1) {
if (reader == null)
System.out.println("File not found: " + filename);
else
System.out.println("File not found: " + filename.replaceAll(".enc", "dec"));
}
BufferedReader br = new BufferedReader(reader);
int offset;
byte[] temp, toFile;
StringTokenizer st = null;
try {
while (br.ready()) {
st = new StringTokenizer(br.readLine());
while (st.hasMoreTokens()){
toFile = encodeDecode(new BigInteger(st.nextToken())).toByteArray();
System.out.println(toFile.length + " x " + (blockSize / 8));
if (toFile[0] == 0 && toFile.length != (blockSize / 8)) {
temp = new byte[blockSize / 8];
offset = temp.length - toFile.length;
for (int i = toFile.length - 1; (i <= 0) && ((i + offset) <= 0); --i) {
temp[i + offset] = toFile[i];
}
toFile = temp;
}
/*if (toFile.length != ((blockSize / 8) + 1)){
temp = new byte[(blockSize / 8) + 1];
System.out.println(toFile.length + " x " + temp.length);
for (int i = 1; i < temp.length; i++) {
temp[i] = toFile[i - 1];
}
toFile = temp;
}
else
System.out.println(toFile.length + " " + ((blockSize / 8) + 1));*/
os.write(toFile);
}
}
}
catch (IOException e1) {
System.out.println("Something went wrong");
}
/**
* close data streams
*/
try {
os.close();
reader.close();
}
catch (IOException e1) {
System.out.println("Error closing file.");
}
}
/**
* Performs <tt>base</tt>^<sup><tt>pow</tt></sup> within the molar
* domain of <tt>mod</tt>.
*
* @param base the base to be raised
* @param pow the power to which the base will be raisded
* @param mod the molar domain over which to perform this operation
* @return <tt>base</tt>^<sup><tt>pow</tt></sup> within the molar
* domain of <tt>mod</tt>.
*/
public BigInteger encodeDecode(BigInteger base) {
BigInteger a = ONE;
BigInteger s = base;
BigInteger n = myKey;
while (!n.equals(ZERO)) {
if(!n.mod(TWO).equals(ZERO))
a = a.multiply(s).mod(myMod);
s = s.pow(2).mod(myMod);
n = n.divide(TWO);
}
return a;
}
}
㈢ 求python RSA 演算法加密字元串的完整源代碼。
import rsa rsaPublickey = int(pubkey, 16) key = rsa.PublicKey(rsaPublickey, 65537) #創建公鑰 message = str(servertime) + '\t' + str(nonce) + '\n' + str(password) #拼接明文js加密文件中得到 passwd = rsa.encrypt(message, key) #加密 passwd = binascii.b2a_hex(passwd) #將加密信息轉換為16進制。 return passwd
㈣ 求RSA加密解密演算法,c++源代碼
#include<iostream.h>
#include<stdio.h>
#include<math.h>
int pf_c(int m,int k);
int pf(int m1,int n1);
int gcd(int f);
int r;
int h;
void main()
{ int a,b,c,d,d1,a1,b1,c1;
cout<<"請輸入你選擇的2個大素數!"<<endl;
cin>>a1;
cin>>b1;
r=a1*b1;
c=(a1-1)*(b1-1);
c1=gcd(c);
cout<<"公開鑰為:"<<c1<<endl;
cout<<"請選擇你要的操作:1.加密 2.解密"<<endl;
cin>>a;
switch(a){
case 1: cout<<"請輸入明文:"<<endl;
cin>>b;
cout<<"密文為:"<<pf_c(b,c1)<<endl;
break;
case 2: cout<<"請輸入密文:"<<endl;
cin>>d;
d1=pf(c,c1);
cout<<"私密鑰為:"<<d1<<endl;
cout<<"明文為:"<<pf_c(d,d1)<<endl;
break;
}
getchar();
}
int pf_c(int m,int k)
{
int a,i1,a1,b[50],c1,c;
c=0;c1=1;i1=0;
do{
a=k/2;
a1=k%2;
b[i1]=a1;
k=a;
i1++;
}while(a>0);
i1--;
for(int i=i1;i>=0;i--)
{
c=2*c;
c1=(c1*c1)%r;
if(b[i]==1)
{
c=c+1;
c1=(c1*m)%r;
}
}
return c1;
}
int pf(int m1,int n1)
{
int x1=1,x2=0,x3;
int y1=0,y2=1,y3;
x3=m1;
y3=n1;
int d;
for(int i=0; ;i++)
{
int q=x3/y3;
int t1=x1-q*y1;
int t2=x2-q*y2;
int t3=x3-q*y3;
x1=y1;
x2=y2;
x3=y3;
y1=t1;
y2=t2;
y3=t3;
if(y3==1)
{
if(y2<0) d=m1+y2;
else d=y2;
break;
}
}
return d;
}
int gcd(int f)
{
int x1=1,x2=0,x3;
int y1=0,y2=1,y3;
for(int i1=2;i1<f;i1++)
{
x3=f;
y3=i1;
int q=x3/y3;
int t1=x1-q*y1;
int t2=x2-q*y2;
int t3=x3-q*y3;
x1=y1;
x2=y2;
x3=y3;
y1=t1;
y2=t2;
y3=t3;
if(y3==1)
{
return i1;
break;
}
}
}
㈤ 求RSA演算法的源代碼(c語言)
這個是我幫個朋友寫的,寫的時候發現其實這個沒那麼復雜,不過,時間復雜度要高於那些成型了的,為人所熟知的rsa演算法的其他語言實現.
#include
int
candp(int
a,int
b,int
c)
{
int
r=1;
b=b+1;
while(b!=1)
{
r=r*a;
r=r%c;
b--;
}
printf("%d",r);
return
r;
}
void
main()
{
int
p,q,e,d,m,n,t,c,r;
char
s;
{printf("input
the
p:\n");
scanf("%d\n",&p);
printf("input
the
q:\n");
scanf("%d%d\n",&p);
n=p*q;
printf("so,the
n
is
%3d\n",n);
t=(p-1)*(q-1);
printf("so,the
t
is
%3d\n",t);
printf("please
intput
the
e:\n");
scanf("%d",&e);
if(e<1||e>t)
{printf("e
is
error,please
input
again;");
scanf("%d",&e);}
d=1;
while
(((e*d)%t)!=1)
d++;
printf("then
caculate
out
that
the
d
is
%5d",d);
printf("if
you
want
to
konw
the
cipher
please
input
1;\n
if
you
want
to
konw
the
plain
please
input
2;\n");
scanf("%d",&r);
if(r==1)
{
printf("input
the
m
:"
);/*輸入要加密的明文數字*/
scanf("%d\n",&m);
c=candp(m,e,n);
printf("so
,the
cipher
is
%4d",c);}
if(r==2)
{
printf("input
the
c
:"
);/*輸入要解密的密文數字*/
scanf("%d\n",&c);
m=candp(c,d,n);
printf("so
,the
cipher
is
%4d\n",m);
printf("do
you
want
to
use
this
programe:yes
or
no");
scanf("%s",&s);
}while(s=='y');
}
}
㈥ 求RSA演算法JAVA實現源代碼(帶界面的)
import javax.crypto.Cipher;
import java.security.*;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.io.*;
import java.math.BigInteger;
/**
* RSA 工具類。提供加密,解密,生成密鑰對等方法。
* 需要到http://www.bouncycastle.org下載bcprov-jdk14-123.jar。
* @author xiaoyusong
* mail: [email protected]
* msn:[email protected]
* @since 2004-5-20
*
*/
public class RSAUtil {
/**
* 生成密鑰對
* @return KeyPair
* @throws EncryptException
*/
public static KeyPair generateKeyPair() throws EncryptException {
try {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
final int KEY_SIZE = 1024;//沒什麼好說的了,這個值關繫到塊加密的大小,可以更改,但是不要太大,否則效率會低
keyPairGen.initialize(KEY_SIZE, new SecureRandom());
KeyPair keyPair = keyPairGen.genKeyPair();
return keyPair;
} catch (Exception e) {
throw new EncryptException(e.getMessage());
}
}
/**
* 生成公鑰
* @param molus
* @param publicExponent
* @return RSAPublicKey
* @throws EncryptException
*/
public static RSAPublicKey generateRSAPublicKey(byte[] molus, byte[] publicExponent) throws EncryptException {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new EncryptException(ex.getMessage());
}
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(molus), new BigInteger(publicExponent));
try {
return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
} catch (InvalidKeySpecException ex) {
throw new EncryptException(ex.getMessage());
}
}
/**
* 生成私鑰
* @param molus
* @param privateExponent
* @return RSAPrivateKey
* @throws EncryptException
*/
public static RSAPrivateKey generateRSAPrivateKey(byte[] molus, byte[] privateExponent) throws EncryptException {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new EncryptException(ex.getMessage());
}
RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(molus), new BigInteger(privateExponent));
try {
return (RSAPrivateKey) keyFac.generatePrivate(priKeySpec);
} catch (InvalidKeySpecException ex) {
throw new EncryptException(ex.getMessage());
}
}
/**
* 加密
* @param key 加密的密鑰
* @param data 待加密的明文數據
* @return 加密後的數據
* @throws EncryptException
*/
public static byte[] encrypt(Key key, byte[] data) throws EncryptException {
try {
Cipher cipher = Cipher.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, key);
int blockSize = cipher.getBlockSize();//獲得加密塊大小,如:加密前數據為128個byte,而key_size=1024 加密塊大小為127 byte,加密後為128個byte;因此共有2個加密塊,第一個127 byte第二個為1個byte
int outputSize = cipher.getOutputSize(data.length);//獲得加密塊加密後塊大小
int leavedSize = data.length % blockSize;
int blocksSize = leavedSize != 0 ? data.length / blockSize + 1 : data.length / blockSize;
byte[] raw = new byte[outputSize * blocksSize];
int i = 0;
while (data.length - i * blockSize > 0) {
if (data.length - i * blockSize > blockSize)
cipher.doFinal(data, i * blockSize, blockSize, raw, i * outputSize);
else
cipher.doFinal(data, i * blockSize, data.length - i * blockSize, raw, i * outputSize);
//這裡面doUpdate方法不可用,查看源代碼後發現每次doUpdate後並沒有什麼實際動作除了把byte[]放到ByteArrayOutputStream中,而最後doFinal的時候才將所有的byte[]進行加密,可是到了此時加密塊大小很可能已經超出了OutputSize所以只好用dofinal方法。
i++;
}
return raw;
} catch (Exception e) {
throw new EncryptException(e.getMessage());
}
}
/**
* 解密
* @param key 解密的密鑰
* @param raw 已經加密的數據
* @return 解密後的明文
* @throws EncryptException
*/
public static byte[] decrypt(Key key, byte[] raw) throws EncryptException {
try {
Cipher cipher = Cipher.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(cipher.DECRYPT_MODE, key);
int blockSize = cipher.getBlockSize();
ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
int j = 0;
while (raw.length - j * blockSize > 0) {
bout.write(cipher.doFinal(raw, j * blockSize, blockSize));
j++;
}
return bout.toByteArray();
} catch (Exception e) {
throw new EncryptException(e.getMessage());
}
}
/**
*
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
File file = new File("test.html");
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] tmpbuf = new byte[1024];
int count = 0;
while ((count = in.read(tmpbuf)) != -1) {
bout.write(tmpbuf, 0, count);
tmpbuf = new byte[1024];
}
in.close();
byte[] orgData = bout.toByteArray();
KeyPair keyPair = RSAUtil.generateKeyPair();
RSAPublicKey pubKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey priKey = (RSAPrivateKey) keyPair.getPrivate();
byte[] pubModBytes = pubKey.getMolus().toByteArray();
byte[] pubPubExpBytes = pubKey.getPublicExponent().toByteArray();
byte[] priModBytes = priKey.getMolus().toByteArray();
byte[] priPriExpBytes = priKey.getPrivateExponent().toByteArray();
RSAPublicKey recoveryPubKey = RSAUtil.generateRSAPublicKey(pubModBytes,pubPubExpBytes);
RSAPrivateKey recoveryPriKey = RSAUtil.generateRSAPrivateKey(priModBytes,priPriExpBytes);
byte[] raw = RSAUtil.encrypt(priKey, orgData);
file = new File("encrypt_result.dat");
OutputStream out = new FileOutputStream(file);
out.write(raw);
out.close();
byte[] data = RSAUtil.decrypt(recoveryPubKey, raw);
file = new File("decrypt_result.html");
out = new FileOutputStream(file);
out.write(data);
out.flush();
out.close();
}
}
http://book.77169.org/data/web5409/20050328/20050328__3830259.html
這個行吧
http://soft.zdnet.com.cn/software_zone/2007/0925/523319.shtml
再參考這個吧
http://topic.csdn.net/t/20040427/20/3014655.html
㈦ 如何利用OpenSSL庫進行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 ";//這是我們需要加密的原始數據
//allocateRSAstructure,首先需要申請一個RSA結構題用於存放生成的公私鑰,這里rsa就是這個結構體的指針
rsa=RSA_new();
if(rsa==NULL)
{
printf("RSA_newfailed ");
return-1;
}
//generateRSAkeys
BIGNUM*exponent;
exponent=BN_new();//生成RSA公私鑰之前需要選擇一個奇數(oddnumber)來用於生成公私鑰
if(exponent==NULL)
{
printf("BN_newfailed ");
gotoFAIL1;
}
if(0==BN_set_word(exponent,65537))//這里選擇奇數65537
{
printf("BN_set_wordfailed ");
gotoFAIL1;
}
//這里molus的長度選擇4096,小於1024的molus長度都是不安全的,容易被破解
if(0==RSA_generate_key_ex(rsa,4096,exponent,NULL))
{
printf("RSA_generate_key_exfailed ");
gotoFAIL;
}
char*cipherstr=NULL;
//分配一段空間用於存儲加密後的數據,這個空間的大小由RSA_size函數根據rsa算出
cipherstr=malloc(RSA_size(rsa));
if(cipherstr==NULL)
{
printf("malloccipherstrbuffailed ");
gotoFAIL1;
}
//下面是實際的加密過程,最後一個參數paddingtype,有以下幾種。
/*
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..
*/
//這里首先用公鑰進行加密,選擇了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'
//下面來用私鑰解密,首先需要一個buffer用於存儲解密後的數據,這個buffer的長度要足夠(小於RSA_size(rsa))
//這里分配一個長度為250的字元數組,應該是夠用的。
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;
}
以上是源代碼,下面使用下面的編譯命令在源碼所在路徑下生成可執行文件
gcc *.c -o openssl_test -lcrypto -ldl -L/usr/local/ssl/lib -I/usr/local/ssl/include
其中,-lcrypto和-ldl是必須的,前者是OpenSSL中的加密演算法庫,後者是用於成功載入動態庫。
㈧ 如何從openssl源碼中提取出rsa加密源碼
#include <openssl/rsa.h>
#include <openssl/sha.h>
int main()
{
RSA *r;
int bits=1024,ret,len,flen,padding,i;
unsigned long e=RSA_3;
BIGNUM *bne;
unsigned char*key,*p;
BIO *b;
unsigned charfrom[500],to[500],out[500];
bne=BN_new();
ret=BN_set_word(bne,e);
r=RSA_new();
ret=RSA_generate_key_ex(r,bits,bne,NULL);
if(ret!=1)
{
printf("RSA_generate_key_ex err!\n");
return -1;
}
/* 私鑰i2d */
b=BIO_new(BIO_s_mem());
ret=i2d_RSAPrivateKey_bio(b,r);
key=malloc(1024);
len=BIO_read(b,key,1024);
BIO_free(b);
b=BIO_new_file("rsa.key","w");
ret=i2d_RSAPrivateKey_bio(b,r);
BIO_free(b);
/* 私鑰d2i */
/* 公鑰i2d */
/* 公鑰d2i */
/* 私鑰加密 */
flen=RSA_size(r);
printf("please select private enc padding : \n");
printf("1.RSA_PKCS1_PADDING\n");
printf("3.RSA_NO_PADDING\n");
printf("5.RSA_X931_PADDING\n");
scanf("%d",&padding);
if(padding==RSA_PKCS1_PADDING)
flen-=11;
else if(padding==RSA_X931_PADDING)
flen-=2;
else if(padding==RSA_NO_PADDING)
flen=flen;
else
{
printf("rsa not surport !\n");
return -1;
}
for(i=0;i<flen;i++)
memset(&from[i],i,1);
len=RSA_private_encrypt(flen,from,to,r,padding);
if(len<=0)
{
printf("RSA_private_encrypt err!\n");
return -1;
}
len=RSA_public_decrypt(len,to,out,r,padding);
if(len<=0)
{
printf("RSA_public_decrypt err!\n");
return -1;
}
if(memcmp(from,out,flen))
{
printf("err!\n");
return -1;
}
/* */
printf("please select public enc padding : \n");
printf("1.RSA_PKCS1_PADDING\n");
printf("2.RSA_SSLV23_PADDING\n");
printf("3.RSA_NO_PADDING\n");
printf("4.RSA_PKCS1_OAEP_PADDING\n");
scanf("%d",&padding);
flen=RSA_size(r);
if(padding==RSA_PKCS1_PADDING)
flen-=11;
else if(padding==RSA_SSLV23_PADDING)
flen-=11;
else if(padding==RSA_X931_PADDING)
flen-=2;
else if(padding==RSA_NO_PADDING)
flen=flen;
else if(padding==RSA_PKCS1_OAEP_PADDING)
flen=flen-2 * SHA_DIGEST_LENGTH-2 ;
else
{
printf("rsa not surport !\n");
return -1;
}
for(i=0;i<flen;i++)
memset(&from[i],i+1,1);
len=RSA_public_encrypt(flen,from,to,r,padding);
if(len<=0)
{
printf("RSA_public_encrypt err!\n");
return -1;
}
len=RSA_private_decrypt(len,to,out,r,padding);
if(len<=0)
{
printf("RSA_private_decrypt err!\n");
return -1;
}
if(memcmp(from,out,flen))
{
printf("err!\n");
return -1;
}
printf("test ok!\n");
RSA_free(r);
return 0;
}
上述程序中當採用公鑰RSA_SSLV23_PADDING加密,用私鑰RSA_SSLV23_PADDING解密時會報錯,原因是openssl源代碼錯誤:
rsa_ssl.c函數RSA_padding_check_SSLv23有:
if (k == -1) /* err */
{
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_SSLV3_ROLLBACK_ATTACK);
return (-1);
}
修改為k!=-1即可。
各種padding對輸入數據長度的要求:
私鑰加密:
RSA_PKCS1_PADDING RSA_size-11
RSA_NO_PADDING RSA_size-0
RSA_X931_PADDING RSA_size-2
公鑰加密
RSA_PKCS1_PADDING RSA_size-11
RSA_SSLV23_PADDING RSA_size-11
RSA_X931_PADDING RSA_size-2
RSA_NO_PADDING RSA_size-0
RSA_PKCS1_OAEP_PADDING RSA_size-2 * SHA_DIGEST_LENGTH-2
㈨ 求RSA演算法的源代碼(c語言)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define MM 7081
#define KK 1789
#define PHIM 6912
#define PP 85
typedef char strtype[10000];
int len;
long nume[10000];
int change[126];
char antichange[37];
void initialize()
{ int i;
char c;
for (i = 11, c = 'A'; c <= 'Z'; c ++, i ++)
{ change[c] = i;
antichange[i] = c;
}
}
void changetonum(strtype str)
{ int l = strlen(str), i;
len = 0;
memset(nume, 0, sizeof(nume));
for (i = 0; i < l; i ++)
{ nume[len] = nume[len] * 100 + change[str[i]];
if (i % 2 == 1) len ++;
}
if (i % 2 != 0) len ++;
}
long binamod(long numb, long k)
{ if (k == 0) return 1;
long curr = binamod (numb, k / 2);
if (k % 2 == 0)
return curr * curr % MM;
else return (curr * curr) % MM * numb % MM;
}
long encode(long numb)
{ return binamod(numb, KK);
}
long decode(long numb)
{ return binamod(numb, PP);
}
main()
{ strtype str;
int i, a1, a2;
long curr;
initialize();
puts("Input 'Y' if encoding, otherwise input 'N':");
gets(str);
if (str[0] == 'Y')
{ gets(str);
changetonum(str);
printf("encoded: ");
for (i = 0; i < len; i ++)
{ if (i) putchar('-');
printf(" %ld ", encode(nume[i]));
}
putchar('\n');
}
else
{ scanf("%d", &len);
for (i = 0; i < len; i ++)
{ scanf("%ld", &curr);
curr = decode(curr);
a1 = curr / 100;
a2 = curr % 100;
printf("decoded: ");
if (a1 != 0) putchar(antichange[a1]);
if (a2 != 0) putchar(antichange[a2]);
}
putchar('\n');
}
putchar('\n');
system("PAUSE");
return 0;
}
測試:
輸入:
Y
FERMAT
輸出:
encoded: 5192 - 2604 - 4222
輸入
N
3 5192 2604 4222
輸出
decoded: FERMAT
㈩ 用RSA演算法設計加密軟體 C語言或者C++
UpdateData(TRUE);
m_miwencode=_T("");
CKEY_PRODUCErsa;
intcodelenght,codenum;
codelenght=m_yuanwencode.GetLength();
codenum=codelenght/3;
CStringstrmod;
strmod.Format(_T("%d"),Model);
ModeNum=strmod.GetLength();
intCryptograph;
for(inti=0;i<codenum;i++)
{
CStringstr;
str=m_yuanwencode.Mid(3*i,3);
intj=(str[0]-'0')*100+(str[1]-'0')*10+(str[2]-'0');
inttemp=1;
for(intk=0;k<PublicKey;k++)
{
temp*=j;
if(temp>=Model)
temp%=Model;
if(!temp)
Cryptograph=temp;
}
Cryptograph=temp%Model;
str.Format(_T("%d"),Cryptograph);
intstrnum=str.GetLength();
if(strnum!=ModeNum)
{
ints=ModeNum-strnum;
if(s==1)
{
str=_T("0")+str;
}
if(s==2)
{
str=_T("00")+str;
}
if(s==3)
{
str=_T("000")+str;
}
if(s==4)
{
str=_T("0000")+str;
}
}
m_miwencode+=str;
}
UpdateData(FALSE);
m_miwencode=_T("");
vs2005編寫的C++(mfc)程序。這個可以不,可以加密字元串,要的話把分給我,發你郵箱里