Example usage for java.security DigestInputStream available

Introduction

In this page you can find the example usage for java.security DigestInputStream available.

Prototype

public int available() throws IOException 

Source Link

Document

Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.

Usage

From source file:com.github.nlloyd.hornofmongo.MongoScope.java

public static Object md5sumFile(Context cx, Scriptable thisObj, Object[] args, Function funObj) {
    assertSingleArgument(args);//from ww w  .j ava 2s .c  o m
    MessageDigest md = null;
    try {
        md = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        Context.throwAsScriptRuntimeEx(e);
    }
    File inFile;
    try {
        inFile = resolveFilePath((MongoScope) thisObj, Context.toString(args[0])).getCanonicalFile();
    } catch (IOException e) {
        Context.throwAsScriptRuntimeEx(e);
        return null;
    }
    InputStream in = null;
    DigestInputStream dis = null;
    try {
        in = new BufferedInputStream(new FileInputStream(inFile));
        dis = new DigestInputStream(in, md);
        while (dis.available() > 0)
            dis.read();
        byte[] digest = md.digest();
        String hexStr = Hex.encodeHexString(digest);
        return hexStr;
    } catch (FileNotFoundException e) {
        Context.throwAsScriptRuntimeEx(e);
    } catch (IOException e) {
        Context.throwAsScriptRuntimeEx(e);
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (IOException e) {
            }
        }
        if (dis != null) {
            try {
                dis.close();
            } catch (IOException e) {
            }
        }
    }
    return Undefined.instance;
}

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From source file:org.panbox.linux.desktop.identitymgmt.TestDownloadHashCompare.java

/**
 * Creates a Hash value for a given file
 * @param file/*from  w  w w . j  a v a 2s  . c  o m*/
 * @return
 */
private byte[] createFileHash(File file) {
    MessageDigest md = null;
    try (InputStream is = Files.newInputStream(Paths.get(file.getAbsolutePath()))) {

        md = MessageDigest.getInstance("SHA-256");
        DigestInputStream dis = new DigestInputStream(is, md);

        /* Read stream to EOF as normal... */

        while (dis.available() > 0) {
            dis.read();
        }

    } catch (NoSuchAlgorithmException e) {
        fail();
    } catch (IOException e1) {
        fail();
    }
    byte[] digest = md.digest();

    //String h = Hex.encodeHexString( digest );

    return digest;
}

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