对字符串进行MD5或SHA1 加密

MD5_SHA1.m

// 需要 #import <CommonCrypto/CommonDigest.h>
// 对字符串进行MD5加密
+ (NSString *)MD5WithString:(NSString *)string
{
    const char *cStr = [string UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (uint32_t)strlen(cStr), digest);
    
    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    
    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [output appendFormat:@"%02x", digest[i]];
    
    return output;
}

// 对字符串进行SHA1加密
+ (NSString *)SHA1WithString:(NSString *)string
{
    const char *cstr = [string cStringUsingEncoding:NSUTF8StringEncoding];
    
    NSData *data = [NSData dataWithBytes:cstr length:string.length];
    //使用对应的CC_SHA1,CC_SHA256,CC_SHA384,CC_SHA512的长度分别是20,32,48,64
    uint8_t digest[CC_SHA1_DIGEST_LENGTH];
    //使用对应的CC_SHA256,CC_SHA384,CC_SHA512
    CC_SHA1(data.bytes, (uint32_t)data.length, digest);
    
    NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
    
    for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
        [output appendFormat:@"%02x", digest[i]];
    
    return output;
}