IOS MD5、SHA1加密

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原创最新推荐文章于 2026-04-11 10:51:12 发布 381 阅读 AI 写同款· GEO 优化 ›

唯品会app api_sign逆向分析上两篇文章分析了两个app的md5算法，今天准备逆向分析sha1加密的app。下图是唯品会app搜索关键词的Headers参数api_sign:值为:233b31e1fa70070e4f56f0b02ff6a4d1817e340f这次的长度不再是32位了，是40位sha1的加密结果是40个16进制，而我们的结果恰好是40位长度。阅读详情

对一长串NSString数据进行MD5、SHA1加密，其做法相对较为简单，利用CC_MD5、CC_SHA1，导入如下库文件：

#import <CommonCrypto/CommonDigest.h>

MD5Util.h

#import <UIKit/UIKit.h>
#import <CommonCrypto/CommonDigest.h>
@class MD5Util;

/**
 * MD5 工具类
 **/
@interface MD5Util : NSObject

/**
 * MD5 加密
 **/
+(NSString *)md5:(NSString *)data;

@end

MD5Util.m

#import <Foundation/Foundation.h>
#import "MD5Util.h"

@implementation MD5Util

+ (NSString *)md5:(NSString *)data{
    const char *cStr = [data UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02X", digest[i]];
    }
    return [result lowercaseString];
}

@end

SHA1Util.h

#import <UIKit/UIKit.h>
#import <CommonCrypto/CommonDigest.h>
@class SHA1Util;

/**
 * SHA1工具类
 **/
@interface SHA1Util : NSObject

/**
 * SHA1加密
 **/
+(NSString *)sha1:(NSString *)data;

@end

SHA1Util.m

#import <Foundation/Foundation.h>
#import "SHA1Util.h"

@implementation SHA1Util

+ (NSString *)sha1:(NSString *)data{
    NSData *cStr = [data dataUsingEncoding:NSUTF8StringEncoding];
    uint8_t digest[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(cStr.bytes,(unsigned int)cStr.length,digest);
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH];
    
    for (int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02x",digest[i]];
    }
    return [result lowercaseString];
}

@end

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