Question

我有哈希二进制数据的问题。我需要做一个位于服务器上的PDF文件的SHA-256哈希。我是这样做的：

<cfset t01= getTickCount()>
<cfhttp
    name="inv1"
    method="get"
    getAsBinary="yes"
    url="http://url.to.pdf.com/INVOICEXY.pdf" 
    result="inv"
    />

<cfset t02= getTickCount()>

<cfoutput>
    <cfdump var="#inv.Filecontent#" />
    CFHTTP: #t02 - t01# ms
</cfoutput>


<cfscript>

imageBinary = inv.Filecontent;
function hashBytes( bytes ){

    // Get our instance of the digest algorithm that we'll use
    // to hash the byte array.
    var messageDigest = createObject( "java", "java.security.MessageDigest" ).getInstance("SHA-256");

    // Get the digest for the given byte array. This returns the
    // digest in byte-array format.
    var digest = messageDigest.digest( bytes );

    // Now that we have our digested byte array (as another byte
    // array), we have to convert that into a HEX string. For
    // this, we'll need a HEX buffer.
    writeDump(digest);
    var hexBuffer = [];

    // Each integer in the byte digest needs to be converted into
    // a HEX character (with possible leading zero).
    for (i = 1 ; i <= arrayLen( bytes ) ; i++){

        // Get only the last 8-bits of the integer.
        var tail = bitAnd( 255, bytes[i] );

        // Get the hex-encoding of the byte.
        var hex = ucase( formatBaseN( tail, 16 ) );

        // In order to make sure that all of the HEX characters
        // are two-digits, we have to prepend a zero for any
        // value that was originall LTE to 16 - the largest value
        // that won't result in two HEX characters.
        arrayAppend(
            hexBuffer,
            (tail <= 16 ? ("0" & hex) : hex)
        );

    }

    // Return the flattened character buffer.
    return( arrayToList( hexBuffer, "" ) );

}

imageHash = hashBytes( imageBinary );

// Create an instance of our DigestUtils class - this class
// simplifies some of the operations we just saw in the
// MessageDigest class above, turning them into simple,
// one-line calls.

writeOutput( "Fingerprint:SHA " & imageHash );

函数hashBytes来自Ben Nadel。我从这个函数得到的输出是一个由53760个字符组成的巨大混乱。我不知道自己做错了什么。

我也试过这个：

<cfscript>

 imageBinary = inv.Filecontent;
 digestUtils = createObject(
        "java",
        "org.apache.commons.codec.digest.DigestUtils"
    );

    // Get the hash of the byte array using our hashBytes() function
    // which dips down into the Java layer directly.
    imageHash = ucase( digestUtils.sha256Hex( imageBinary ) );

    // Output the image "fingerprint".
    writeOutput( "Fingerprint: " & imageHash );

</cfscript>

我收到错误

未找到sha256Hex方法

虽然我在commons-codec-1.8.jar文件夹中有wwwroot\WEB-INF\lib，但该文件夹应包含DigestUtils的版本，包括sha256Hex()

非常感谢！

修改我解决了chars长期回归的问题。这是一个可怕的错误。在Ben Nadel的原始代码中，这行代码for (var byte in digest){...在Coldfusion 9中不起作用。所以我将其更改为：for (i = 1 ; i <= arrayLen( bytes ) ; i++){...而不是：for (i = 1 ; i <= arrayLen( digest ) ; i++){...和{{1转到var tail = bitAnd( 255, bytes[i] );

Coldfusion 9哈希二进制SHA-256

0 个答案: