ios 数据加密

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在ios api中已经封装好了MD5算法。

一下上代码

#import "NSObject+md5Encrypt.h"
#import "CommonCrypto/CommonDigest.h"

@implementation NSObject (md5Encrypt)

+(NSString *)getMd5_32Bit_String:(NSString *)srcString
{
    const char *cStr = [srcString UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
    NSMutableString *hash = [NSMutableString string];
    for (int i = 0; i < 16; i++) {
        [hash appendFormat:@"%02x", result[i]];
    }
    return hash;
}

@end

这个相对来说比较简单，可在www.cmd5.com上破解。在代码中不能实现解密。

apple还提供了RSA、DES、AES等加密算法，见到国外的网站关于AES加密的算法。

//sha1加密方式
- (NSString *)getSha1String:(NSString *)srcString{
    const char *cstr = [srcString cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:srcString.length];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    CC_SHA1(data.bytes,(CC_LONG) data.length, digest);

    NSMutableString* result = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];

    for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x", digest[i]];
    }

    return result;
}

//sha256加密方式
- (NSString *)getSha256String:(NSString *)srcString {
    const char *cstr = [srcString cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:srcString.length];

    uint8_t digest[CC_SHA256_DIGEST_LENGTH];

    CC_SHA1(data.bytes, (CC_LONG)data.length, digest);

    NSMutableString* result = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];

    for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x", digest[i]];
    }

    return result;
}

//sha384加密方式
- (NSString *)getSha384String:(NSString *)srcString {
    const char *cstr = [srcString cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:srcString.length];

    uint8_t digest[CC_SHA384_DIGEST_LENGTH];

    CC_SHA1(data.bytes, (CC_LONG)data.length, digest);

    NSMutableString* result = [NSMutableString stringWithCapacity:CC_SHA384_DIGEST_LENGTH * 2];

    for(int i = 0; i < CC_SHA384_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x", digest[i]];
    }

    return result;
}

//sha512加密方式
- (NSString*) getSha512String:(NSString*)srcString {
    const char *cstr = [srcString cStringUsingEncoding:NSUTF8StringEncoding];
    NSData *data = [NSData dataWithBytes:cstr length:srcString.length];
    uint8_t digest[CC_SHA512_DIGEST_LENGTH];

    CC_SHA512(data.bytes, (CC_LONG)data.length, digest);

    NSMutableString* result = [NSMutableString stringWithCapacity:CC_SHA512_DIGEST_LENGTH * 2];
    for(int i = 0; i < CC_SHA512_DIGEST_LENGTH; i++)
        [result appendFormat:@"%02x", digest[i]];
    return result;
}

这里是代码 http://download.csdn.net/detail/w824585608/9066899

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