Java DigestInputStream.read方法代码示例

import java.security.DigestInputStream; //导入方法依赖的package包/类
/**
 * 获取文件的 MD5
 */
public static String encode(File file) {
    try {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        FileInputStream inputStream = new FileInputStream(file);
        DigestInputStream digestInputStream = new DigestInputStream(inputStream, messageDigest);
        //必须把文件读取完毕才能拿到md5
        byte[] buffer = new byte[4096];
        while (digestInputStream.read(buffer) > -1) {
        }
        MessageDigest digest = digestInputStream.getMessageDigest();
        digestInputStream.close();
        byte[] md5 = digest.digest();
        StringBuilder sb = new StringBuilder();
        for (byte b : md5) {
            sb.append(String.format("%02X", b));
        }
        return sb.toString().toLowerCase();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
@Rpc(description = "Compute MD5 hash on a content URI. Return the MD5 has has a hex string.")
public String fileMd5Hash(String uri) throws IOException, NoSuchAlgorithmException {
    Uri uri_ = Uri.parse(uri);
    ParcelFileDescriptor pfd = mContext.getContentResolver().openFileDescriptor(uri_, "r");
    MessageDigest md = MessageDigest.getInstance("MD5");
    int length = (int) pfd.getStatSize();
    byte[] buf = new byte[length];
    ParcelFileDescriptor.AutoCloseInputStream stream =
            new ParcelFileDescriptor.AutoCloseInputStream(pfd);
    DigestInputStream dis = new DigestInputStream(stream, md);
    try {
        dis.read(buf, 0, length);
        return Utils.bytesToHexString(md.digest());
    } finally {
        dis.close();
        stream.close();
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
/**
 * 
 * @param inputStream
 * @return
 * @throws NoSuchAlgorithmException
 * @throws IOException
 */
public static Md5Result generateChecksum(InputStream inputStream) throws NoSuchAlgorithmException, IOException {
	Md5Result md5 = new Md5Result();
	MessageDigest md = MessageDigest.getInstance("MD5");
	DigestInputStream dis = new DigestInputStream(inputStream, md);
	
	byte[] dataBytes = new byte[4096];
      
       int nread = 0; 
       while ((nread = dis.read(dataBytes)) != -1) {
       	md5.contentLength += nread;
       };
       
       dis.close();
       
       long startNs = System.nanoTime();
       md5.md5 = generateChecksumFromDigest(md.digest());
       md5.generatingTimeNs = System.nanoTime() - startNs;
       
       return md5;
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
/**
 * @source http://stackoverflow.com/a/304350
 */
private static byte[] hash(String alg, InputStream in) throws Exception {
    MessageDigest md = MessageDigest.getInstance(alg);
    DigestInputStream dis = new DigestInputStream(new BufferedInputStream(in), md);
    try {
        byte[] buffer = new byte[1024];
        while (true) {
            int readCount = dis.read(buffer);
            if (readCount < 0) {
                break;
            }
        }
        return md.digest();
    } finally {
        in.close();
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
private static boolean checkSHA256(File provingKey, Component parent) throws IOException {
    MessageDigest sha256;
    try {
        sha256 = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException impossible) {
        throw new IOException(impossible);
    }
    try (InputStream is = new BufferedInputStream(new FileInputStream(provingKey))) {
        ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(parent,"Verifying proving key",is);
        pmis.getProgressMonitor().setMaximum(PROVING_KEY_SIZE);
        pmis.getProgressMonitor().setMillisToPopup(10);
        DigestInputStream dis = new DigestInputStream(pmis, sha256);
        byte [] temp = new byte[0x1 << 13];
        while(dis.read(temp) >= 0);
        byte [] digest = sha256.digest();
        return SHA256.equalsIgnoreCase(DatatypeConverter.printHexBinary(digest));
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
public static byte[] calculateSHA256Digest(byte[] input)
	throws IOException 
{
       try 
       {
       	MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
       	DigestInputStream dis = new DigestInputStream(new ByteArrayInputStream(input), sha256);
           byte [] temp = new byte[0x1 << 13];
           byte[] digest;
           while(dis.read(temp) >= 0);
           {
           	digest = sha256.digest();
           }
           
           return digest;
       } catch (NoSuchAlgorithmException impossible) 
       {
           throw new IOException(impossible);
       }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
private static boolean checkSHA256(File provingKey, Component parent) throws IOException {
    MessageDigest sha256;
    try {
        sha256 = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException impossible) {
        throw new RuntimeException(impossible);
    }
    try (InputStream is = new BufferedInputStream(new FileInputStream(provingKey))) {
        ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(parent,"Verifying proving key",is);
        pmis.getProgressMonitor().setMaximum(PROVING_KEY_SIZE);
        pmis.getProgressMonitor().setMillisToPopup(10);
        DigestInputStream dis = new DigestInputStream(pmis, sha256);
        byte [] temp = new byte[0x1 << 13];
        while(dis.read(temp) >= 0);
        byte [] digest = sha256.digest();
        return SHA256.equalsIgnoreCase(DatatypeConverter.printHexBinary(digest));
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
protected byte[] hash(InputStream input) throws SdkClientException {
    try {
        MessageDigest md = getMessageDigestInstance();
        @SuppressWarnings("resource")
        DigestInputStream digestInputStream = new SdkDigestInputStream(
                input, md);
        byte[] buffer = new byte[1024];
        while (digestInputStream.read(buffer) > -1) {
            ;
        }
        return digestInputStream.getMessageDigest().digest();
    } catch (Exception e) {
        throw new SdkClientException(
                "Unable to compute hash while signing request: "
                + e.getMessage(), e);
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
protected byte[] hash(InputStream input) throws SdkClientException {
    try {
        MessageDigest md = getMessageDigestInstance();
        @SuppressWarnings("resource")
        DigestInputStream digestInputStream = new SdkDigestInputStream(
                input, md);
        byte[] buffer = new byte[1024];
        while (digestInputStream.read(buffer) > -1)
            ;
        return digestInputStream.getMessageDigest().digest();
    } catch (Exception e) {
        throw new SdkClientException(
                "Unable to compute hash while signing request: "
                        + e.getMessage(), e);
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
static String md5sum(InputStream input) throws IOException {
  BufferedInputStream in = new BufferedInputStream(input);

  try {
    MessageDigest e = MessageDigest.getInstance("MD5");
    DigestInputStream digestInputStream = new DigestInputStream(in, e);
    boolean bytesRead = false;
    byte[] buffer = new byte[8192];

    while(digestInputStream.read(buffer) != -1) {
      // CHECKSTYLE:OFF EmptyStatement
      ;
      // CHECKSTYLE:ON
    }

    ByteArrayOutputStream md5out = new ByteArrayOutputStream();
    md5out.write(e.digest());
    String var7 = md5out.toString();
    return var7;
  } catch (NoSuchAlgorithmException var11) {
    throw new IllegalStateException("MD5 algorithm is not available: " + var11);
  } finally {
    in.close();
  }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
public String getMd5(File f) throws IOException {

		FileInputStream in = new FileInputStream(f);
		DigestInputStream di = new DigestInputStream(in, md);

		byte[] buffer = new byte[bufferSize];
		while (di.read(buffer) > 0)
			;
		md = di.getMessageDigest();

		di.close();
		in.close();

		byte[] digest = md.digest();
		return byteArrayToHex(digest);
	}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
public static String hashFile(File file) throws NoSuchAlgorithmException, IOException {
    MessageDigest md = MessageDigest.getInstance("MD5");
    try (InputStream is = Files.newInputStream(Paths.get(file.getAbsolutePath()))) {
        DigestInputStream ds = new DigestInputStream(is, md);
        byte[] input = new byte[1024];

        // Read the stream to the end to get the md5
        while (ds.read(input) != -1) {
        }

        byte[] hash = md.digest();
        StringBuilder sb = new StringBuilder();
        for (byte b : hash) {
            sb.append(String.format("%02X", b));
        }
        return sb.toString();
    }
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
public static byte[] computeFileDigest(final String fileName) throws IOException {
    try {
        final FileInputStream fis = new FileInputStream(fileName);
        final MessageDigest md = MessageDigest.getInstance("SHA-256");
        final DigestInputStream dis = new DigestInputStream(fis, md);

        final int readLen = 128;
        final byte[] readBytes = new byte[readLen];
        while (dis.read(readBytes) != -1) {
        }
        dis.close();

        return md.digest();
    } catch (NoSuchAlgorithmException e) {
        // shouldn't get here since we hardcode the algorithm.
    }

    return null;
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
/**
 * Generate a SHA.1 Hash for a given file.
 * @param file the file to hash
 * @return the hash value as a String
 * @throws IOException if the file cannot be read
 */
public static String sha1Hash(File file) throws IOException {
	try {
		DigestInputStream inputStream = new DigestInputStream(
				new FileInputStream(file), MessageDigest.getInstance("SHA-1"));
		try {
			byte[] buffer = new byte[4098];
			while (inputStream.read(buffer) != -1) {
				// Read the entire stream
			}
			return bytesToHex(inputStream.getMessageDigest().digest());
		}
		finally {
			inputStream.close();
		}
	}
	catch (NoSuchAlgorithmException ex) {
		throw new IllegalStateException(ex);
	}
}
 

import java.security.DigestInputStream; //导入方法依赖的package包/类
/**
 * Generate hash bytes for the specified stream, using specified algorithm
 *
 * @param inputStream Data stream
 * @param algorithm   Hashing algorithm
 * @return Hash bytes
 */
@NonNull
public static byte[] generateHashBytes(@NonNull InputStream inputStream, @NonNull String algorithm) {
    try {
        DigestInputStream digestStream = new DigestInputStream(inputStream, MessageDigest.getInstance(algorithm));
        byte[] buffer = new byte[BUFFER_SIZE];
        for (; ; ) {
            if (digestStream.read(buffer) < 0) {
                break;
            }
        }
        return digestStream.getMessageDigest().digest();
    } catch (NoSuchAlgorithmException | IOException e) {
        throw new RuntimeException(e);
    } finally {
        CommonUtils.close(inputStream);
    }
}