ios加密算法汇总

系统管理员 2022-08-20 10:29 120阅读 0赞

把相关算法的代码也贴一下吧 （其实使用一些成熟的第三方库或许会来得更加简单，不过自己写，自由点）。注，这里的大部分加密算法都是参考一些现有成熟的算法，或者直接拿来用的。  
1、MD5   
//因为是使用category，所以木有参数传入啦  
  
\-( NSString  \*) stringFromMD5 \{   
 if ( self  ==  nil  || \[ self  length \] ==  0 ) \{   
 return  nil ;  
 \}  
 const  char  \*value = \[ self  UTF8String \];  
 unsigned  char  outputBuffer\[ CC\_MD5\_DIGEST\_LENGTH \];  
 CC\_MD5 (value,  strlen (value), outputBuffer);  
 NSMutableString  \*outputString = \[\[ NSMutableString  alloc \]  initWithCapacity : CC\_MD5\_DIGEST\_LENGTH  \*  2 \];  
 for ( NSInteger  count =  0 ; count <  CC\_MD5\_DIGEST\_LENGTH ; count++)\{   
 \[outputString  appendFormat : @"%02x" ,outputBuffer\[count\]\];  
 \}  
 return  \[outputString  autorelease \];  
\}  
  
  
2、Base64  
  
\+ ( NSString  \*) base64EncodeData: ( NSData  \*) objData \{   
const  unsigned  char  \* objRawData = \[objData  bytes \];  
char  \* objPointer;  
char  \* strResult;  
  
 // Get the Raw Data length and ensure we actually have data  
int  intLength = \[objData  length \];  
if  (intLength ==  0 )  return  nil ;  
  
 // Setup the String-based Result placeholder and pointer within that placeholder  
strResult = ( char  \*) calloc (((intLength +  2 ) /  3 ) \*  4 ,  sizeof ( char ));  
objPointer = strResult;  
  
 // Iterate through everything  
 while  (intLength >  2 ) \{  // keep going until we have less than 24 bits  
\*objPointer++ =  \_base64EncodingTable \[objRawData\[ 0 \] >>  2 \];  
\*objPointer++ =  \_base64EncodingTable \[((objRawData\[ 0 \] &  0x03 ) <<  4 ) + (objRawData\[ 1 \] >>  4 )\];  
\*objPointer++ =  \_base64EncodingTable \[((objRawData\[ 1 \] &  0x0f ) <<  2 ) + (objRawData\[ 2 \] >>  6 )\];  
\*objPointer++ =  \_base64EncodingTable \[objRawData\[ 2 \] &  0x3f \];  
  
 // we just handled 3 octets (24 bits) of data  
objRawData +=  3 ;  
intLength -=  3 ;  
\}  
  
 // now deal with the tail end of things  
if  (intLength !=  0 ) \{   
\*objPointer++ =  \_base64EncodingTable \[objRawData\[ 0 \] >>  2 \];  
if  (intLength >  1 ) \{   
\*objPointer++ =  \_base64EncodingTable \[((objRawData\[ 0 \] &  0x03 ) <<  4 ) + (objRawData\[ 1 \] >>  4 )\];  
\*objPointer++ =  \_base64EncodingTable \[(objRawData\[ 1 \] &  0x0f ) <<  2 \];  
\*objPointer++ =  '=' ;  
\}  else  \{   
\*objPointer++ =  \_base64EncodingTable \[(objRawData\[ 0 \] &  0x03 ) <<  4 \];  
\*objPointer++ =  '=' ;  
\*objPointer++ =  '=' ;  
\}  
\}  
  
 // Terminate the string-based result  
\*objPointer =  '\\0' ;  
  
 NSString  \*rstStr = \[ NSString  stringWithCString :strResult  encoding : NSASCIIStringEncoding \];  
 free (objPointer);  
 return  rstStr;  
\}  
  
  
  
  
3、AES  
\-( NSData \*) EncryptAES: ( NSString  \*) key \{   
 char  keyPtr\[ kCCKeySizeAES256 \+ 1 \];  
 bzero (keyPtr,  sizeof (keyPtr));  
  
 \[key  getCString :keyPtr  maxLength : sizeof (keyPtr)  encoding : NSUTF8StringEncoding \];  
  
 NSUInteger  dataLength = \[ self  length \];  
  
 size\_t  bufferSize = dataLength +  kCCBlockSizeAES128 ;  
 void  \*buffer =  malloc (bufferSize);  
  
 size\_t  numBytesEncrypted =  0 ;  
 CCCryptorStatus  cryptStatus =  CCCrypt ( kCCEncrypt ,  kCCAlgorithmAES128 ,  
 kCCOptionPKCS7Padding  |  kCCOptionECBMode ,  
 keyPtr,  kCCBlockSizeAES128 ,  
 NULL ,  
 \[ self  bytes \], dataLength,  
 buffer, bufferSize,  
 &numBytesEncrypted);  
 if  (cryptStatus ==  kCCSuccess ) \{   
 return  \[ NSData  dataWithBytesNoCopy :buffer  length :numBytesEncrypted\];  
 \}  
  
 free (buffer);  
 return  nil ;  
\}  
  
  
4、RSA  
  
\- ( NSData  \*) encryptWithData:( NSData  \*)content \{   
 size\_t  plainLen = \[content  length \];  
 if  (plainLen >  maxPlainLen ) \{   
 NSLog ( @"content(%ld) is too long, must < %ld" , plainLen,  maxPlainLen );  
 return  nil ;  
 \}  
  
 void  \*plain =  malloc (plainLen);  
 \[content  getBytes :plain  
 length :plainLen\];  
  
 size\_t  cipherLen =  128 ;  // currently RSA key length is set to 128 bytes  
 void  \*cipher =  malloc (cipherLen);  
  
 OSStatus  returnCode =  SecKeyEncrypt ( publicKey ,  kSecPaddingPKCS1 , plain,  
 plainLen, cipher, &cipherLen);  
  
 NSData  \*result =  nil ;  
 if  (returnCode !=  0 ) \{   
 NSLog ( @"SecKeyEncrypt fail. Error Code: %ld" , returnCode);  
 \}  
 else  \{   
 result = \[ NSData  dataWithBytes :cipher  
 length :cipherLen\];  
 \}  
  
 free (plain);  
 free (cipher);  
  
 return  result;  
\}