字串加密解密

using system.security.cryptography;

using system.io;

//加密函式

static stirng encrypt(string str)

descryptoserviceprovider descsp=new descryptoserviceprovider();

byte key=encoding.unicode.getbytes(encryptkey);

byte data=encoding.unicode.getbytes(str);

memorystream mstream=new memorystream();

cryptostream cstream= new cryptostream(mstream,descsp.createencryptor(key,key),cryptostreammode.write);

cstream.write(data,0,data.length);

cstream.flushfinalblock();

return convert.tobase64string(mstream.toarray());

//解密函式

static stirng decrypt(string str)

descryptoserviceprovider descsp=new descryptoserviceprovider();

byte key=encoding.unicode.getbytes(encryptkey);

byte data=convert.frombase64string(str);

memorystream mstream=new memorystream();

cryptostream cstream= new cryptostream(mstream,descsp.createencryptor(key,key),cryptostreammode.write);

cstream.write(data,0,data.length);

cstream.flushfinalblock();

return encoding.unicode.getstring(mstream.toarray()); 

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