Question

根据this site mysql使用：

$message[0]

生成密码（）哈希。

...

我已从另一个StackOverflow post复制此功能：

<?php
$lastDate = NULL;

$chat = file("members/cdn/1/chats/9188.txt");
foreach($chat as $line) :
    $name = strchr($line,":",true);
    $message = explode(' ', substr(strchr($line,":"),1), 3);
    if($lastDate != $message[0]) :
        $lastDate = $message[0];
?>
    <div><?=$message[0];?></div>
<?php
    endif;
?>
    <div class="container">
      <div class="arrow">
        <div class="outer"></div>
        <div class="inner"></div>
      </div>
      <div class="message-body">
        <p><?=$message[2];?></p>
        <p class="message_time"><?=date("g:i a", strtotime($message[1]));?></p>
      </div>
    </div>
    <div class="spacer"></div>
<?php
endforeach;
?>

生成sh1哈希值。但正如第一个链接所说：

第二个SHA1（）应用于第一个SHA1（）返回的二进制数据，而不是其十六进制表示。因此，在SQL中，我必须在应用第二个SHA1之前使用UNHEX（）。

所以我必须这样做：

SHA1(UNHEX(SHA1("this_is_a_random_string")))

但无论我尝试什么，我都无法让它发挥作用。

最简单的方法是什么？

谢谢！

Answer 1

- (NSString *)mysqlHashFromString:(NSString *)password{
    NSString *sha1String = [self sha1:password];
    NSData *sha1StringBinaryRepresentation = [self dataWithString:sha1String];
    NSString *finalHash = [self hexStringValue:[self SHA1Digest:sha1StringBinaryRepresentation ]];
    return finalHash;
} 

- (NSData *)dataWithString:(NSString *)string {
   NSString *command = [command stringByReplacingOccurrencesOfString:@" " withString:@""];
   NSMutableData *commandToSend = [NSMutableData new];
   unsigned char whole_byte;
   char byte_chars[3] = {'\0','\0','\0'};
   int i;
   for (i=0; i < [command length]/2; i++) {
       byte_chars[0] = [command characterAtIndex:i*2];
       byte_chars[1] = [command characterAtIndex:i*2+1];
       whole_byte = strtol(byte_chars, NULL, 16);
       [commandToSend appendBytes:&whole_byte length:1]; 
   }
   return commandToSend;
}

- (NSString *)sha1:(NSString *)plainTextPasssword{
    NSData *data = [plainTextPasssword dataUsingEncoding:NSUTF8StringEncoding];
    uint8_t digest[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(data.bytes, 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;
}

- (NSData *)SHA1Digest:(NSData *)data {
    unsigned char result[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1([data bytes], [data length], result);
    return [NSData dataWithBytes:result length:CC_SHA1_DIGEST_LENGTH];
}

- (NSString *)hexStringValue:(NSData *)data {
    NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:([data length] * 2)];
    const unsigned char *dataBuffer = [data bytes];
    for (int i = 0; i < [data length]; ++i) {
        [stringBuffer appendFormat:@"%02x", (unsigned long)dataBuffer[i]];
    }

    return [stringBuffer copy];
}

Creating SHA1 Hash from NSString
Converting HEX NSString To NSData
https://github.com/ali-rantakari/Tagger/blob/master/NSData%2BSHA1.m

目标C：以mysql password（）的方式生成哈希值

1 个答案: