md5加密

#import <Foundation/Foundation.h>

@interface CJMD5 : NSObject

+(NSString *)md5HexDigest:(NSString *)input;

@end

#import "CJMD5.h"
#import <CommonCrypto/CommonCrypto.h>

@implementation CJMD5

+ (NSString *)md5HexDigest:(NSString*)input
{
    const char* str = [input UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(str, strlen(str), result);
    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2];//
    
    for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}

@end