org.apache.poi.poifs.crypt
public class CryptoFunctions extends java.lang.Object
Constructor and Description |
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CryptoFunctions() |
Modifier and Type | Method and Description |
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static byte[] |
createXorArray1(java.lang.String password)
Creates an byte array for xor obfuscation (method 1)
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static int |
createXorKey1(java.lang.String password)
Create the xor key for xor obfuscation, which is used to create the xor array (method 1)
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static int |
createXorVerifier1(java.lang.String password)
Create the verifier for xor obfuscation (method 1)
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static int |
createXorVerifier2(java.lang.String password)
This method generates the xor verifier for word documents < 2007 (method 2).
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static byte[] |
generateIv(HashAlgorithm hashAlgorithm,
byte[] salt,
byte[] blockKey,
int blockSize)
2.3.4.12 Initialization Vector Generation (Agile Encryption)
Initialization vectors are used in all cases for agile encryption.
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static byte[] |
generateKey(byte[] passwordHash,
HashAlgorithm hashAlgorithm,
byte[] blockKey,
int keySize)
2.3.4.11 Encryption Key Generation (Agile Encryption)
...
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static byte[] |
getBlock0(byte[] hash,
int size) |
static byte[] |
getBlock36(byte[] hash,
int size) |
static javax.crypto.Cipher |
getCipher(javax.crypto.SecretKey key,
CipherAlgorithm cipherAlgorithm,
ChainingMode chain,
byte[] vec,
int cipherMode) |
static javax.crypto.Cipher |
getCipher(javax.crypto.SecretKey key,
CipherAlgorithm cipherAlgorithm,
ChainingMode chain,
byte[] vec,
int cipherMode,
java.lang.String padding) |
static javax.crypto.Mac |
getMac(HashAlgorithm hashAlgorithm) |
static java.security.MessageDigest |
getMessageDigest(HashAlgorithm hashAlgorithm) |
static byte[] |
getUtf16LeString(java.lang.String str) |
static byte[] |
hashPassword(java.lang.String password,
HashAlgorithm hashAlgorithm,
byte[] salt,
int spinCount)
2.3.4.7 ECMA-376 Document Encryption Key Generation (Standard Encryption)
2.3.4.11 Encryption Key Generation (Agile Encryption)
The encryption key for ECMA-376 document encryption [ECMA-376] using agile encryption MUST be
generated by using the following method, which is derived from PKCS #5: Password-Based
Cryptography Version 2.0 [RFC2898].
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static byte[] |
hashPassword(java.lang.String password,
HashAlgorithm hashAlgorithm,
byte[] salt,
int spinCount,
boolean iteratorFirst)
Generalized method for read and write protection hash generation.
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static java.lang.String |
xorHashPassword(java.lang.String password)
This method generates the xored-hashed password for word documents < 2007.
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static java.lang.String |
xorHashPasswordReversed(java.lang.String password)
Convenience function which returns the reversed xored-hashed password for further
processing in word documents 2007 and newer, which utilize a real hashing algorithm like sha1.
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public static byte[] hashPassword(java.lang.String password, HashAlgorithm hashAlgorithm, byte[] salt, int spinCount)
generateKey(byte[],HashAlgorithm,byte[],int)
password
- hashAlgorithm
- salt
- spinCount
- public static byte[] hashPassword(java.lang.String password, HashAlgorithm hashAlgorithm, byte[] salt, int spinCount, boolean iteratorFirst)
password
- hashAlgorithm
- salt
- spinCount
- iteratorFirst
- if true, the iterator is hashed before the n-1 hash value,
if false the n-1 hash value is applied firstpublic static byte[] generateIv(HashAlgorithm hashAlgorithm, byte[] salt, byte[] blockKey, int blockSize)
public static byte[] generateKey(byte[] passwordHash, HashAlgorithm hashAlgorithm, byte[] blockKey, int keySize)
passwordHash
- hashAlgorithm
- blockKey
- keySize
- public static javax.crypto.Cipher getCipher(javax.crypto.SecretKey key, CipherAlgorithm cipherAlgorithm, ChainingMode chain, byte[] vec, int cipherMode)
public static javax.crypto.Cipher getCipher(javax.crypto.SecretKey key, CipherAlgorithm cipherAlgorithm, ChainingMode chain, byte[] vec, int cipherMode, java.lang.String padding)
key
- chain
- vec
- cipherMode
- Cipher.DECRYPT_MODE or Cipher.ENCRYPT_MODEjava.security.GeneralSecurityException
public static byte[] getBlock36(byte[] hash, int size)
public static byte[] getBlock0(byte[] hash, int size)
public static byte[] getUtf16LeString(java.lang.String str)
public static java.security.MessageDigest getMessageDigest(HashAlgorithm hashAlgorithm)
public static javax.crypto.Mac getMac(HashAlgorithm hashAlgorithm)
public static int createXorVerifier2(java.lang.String password)
password
- the passwordpublic static java.lang.String xorHashPassword(java.lang.String password)
public static java.lang.String xorHashPasswordReversed(java.lang.String password)
public static int createXorVerifier1(java.lang.String password)
password
- the passwordpublic static int createXorKey1(java.lang.String password)
password
- the passwordpublic static byte[] createXorArray1(java.lang.String password)
password
- the passwordCopyright 2014 The Apache Software Foundation or its licensors, as applicable.