com.tencent.mm.opensdk.utils

Class MD5

java.lang.Object

com.tencent.mm.opensdk.utils.MD5

public final class MD5
extends java.lang.Object

MD5 digest wrapper

MD5计算封装

Method Summary

Modifier and Type	Method and Description
static java.lang.String	getMD5(java.io.File file) Get the md5 for the file, using less memory.
static java.lang.String	getMD5(java.io.File file, int bufLen) Get the md5 for the file.
static java.lang.String	getMD5(java.io.File file, int offset, int length) Get the md5 for the file, using less memory.
static java.lang.String	getMD5(java.io.InputStream is, int bufLen) Get the md5 for inputStream.
static java.lang.String	getMD5(java.io.InputStream is, int bufLen, int offset, int length) Get the md5 for inputStream.
static java.lang.String	getMD5(java.lang.String file) Get the md5 for the file, using less memory.
static java.lang.String	getMD5(java.lang.String file, int offset, int length) Get the md5 for the file, using less memory.
static java.lang.String	getMD5ExtendBytes(java.io.File file, int offset, int length, byte[] extend)
static java.lang.String	getMD5ExtendBytes(java.io.InputStream is, int bufLen, int offset, int length, byte[] extendBytes) Get the md5 for inputStream.
static java.lang.String	getMessageDigest(byte[] buffer) get md5 string for input buffer
static byte[]	getRawDigest(byte[] buffer) get md5 in byte array

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getMessageDigest

public static final java.lang.String getMessageDigest(byte[] buffer)

get md5 string for input buffer

Parameters:

buffer - data to be calculated

Returns:

md5 result in string format

getRawDigest

public static final byte[] getRawDigest(byte[] buffer)

get md5 in byte array

Parameters:

buffer - data to be calculated

Returns:

md5 result in byte array format

getMD5

public static final java.lang.String getMD5(java.io.InputStream is,
                                            int bufLen,
                                            int offset,
                                            int length)

Get the md5 for inputStream. This method cost less memory. It read bufLen bytes from the FileInputStream once.

Parameters:

is -

bufLen - bytes number read from the stream once. The less bufLen is the more times getMD5() method takes. Also the less bufLen is the less memory cost.

getMD5ExtendBytes

public static final java.lang.String getMD5ExtendBytes(java.io.InputStream is,
                                                       int bufLen,
                                                       int offset,
                                                       int length,
                                                       byte[] extendBytes)

Get the md5 for inputStream. This method cost less memory. It read bufLen bytes from the FileInputStream once.

Parameters:

is -

bufLen -

offset -

length -

extendBytes - extend bytes which would be add to the end of input stream for MD5 calculating

getMD5

public static final java.lang.String getMD5(java.io.InputStream is,
                                            int bufLen)

Get the md5 for inputStream. This method cost less memory. It read bufLen bytes from the FileInputStream once.

Parameters:

is -

bufLen - bytes number read from the stream once. The less bufLen is the more times getMD5() method takes. Also the less bufLen is the less memory cost.

getMD5

public static java.lang.String getMD5(java.lang.String file)

Get the md5 for the file, using less memory.

getMD5

public static java.lang.String getMD5(java.io.File file)

Get the md5 for the file, using less memory.

getMD5

public static java.lang.String getMD5(java.io.File file,
                                      int bufLen)

Get the md5 for the file. call getMD5(FileInputStream is, int bufLen) inside.

Parameters:

file -

bufLen - bytes number read from the stream once. The less bufLen is the more times getMD5() method takes. Also the less bufLen cost less memory.

getMD5

public static java.lang.String getMD5(java.lang.String file,
                                      int offset,
                                      int length)

Get the md5 for the file, using less memory.

getMD5

public static java.lang.String getMD5(java.io.File file,
                                      int offset,
                                      int length)

Get the md5 for the file, using less memory.

getMD5ExtendBytes

public static java.lang.String getMD5ExtendBytes(java.io.File file,
                                                 int offset,
                                                 int length,
                                                 byte[] extend)