PEAR 2000/12/03 -

Crypt_HCEMD5

Warning: documentation is missing.

private class Crypt_HCEMD5

Public Method Summary
void	Crypt_HCEMD5(string $key, [ string $rand ]) Creates a Crypt_HCEMD5 object.
string	encrypt(string $data) Encrypt a block of data.
string	decrypt(string $data) Decrypt a block of data.
string	encodeMime(string $data) Encrypt a block of data after MIME-encoding it.
string	decodeMime(string $data) Decrypt a block of data and then MIME-decode it.
void	encodeMimeSelfRand(string $data) Encrypt a block of data after MIME-encoding it, and include the
string	decodeMimeSelfRand(string $data) Decrypt a block of data and then MIME-decode it, using the

Private Method Summary
string	binmd5(string $string) Implment md5 hashing in php, though use the mhash() function if it is available.
string	array2pack(array $array) Turn an array into a binary packed string.
void	newKey(string $round) Generate a new key for a new encryption block.

Private Field Summary
string	$key The first key to use. This should be a shared secret.
long	$rand The second key to use. This should be a randomly generated

Public Method Details

Crypt_HCEMD5

public void Crypt_HCEMD5( string $key, [ string $rand ] )

Creates a Crypt_HCEMD5 object.

Parameter

string	$key
	shared secret key

string	$rand	`= >>null<<`
	(optional) The randomly generated key

Returns

void

encrypt

public string encrypt( string $data )

Encrypt a block of data.

Parameter

string	$data
	data to encrypt.

Returns

string

The encrypted binary data.

decrypt

public string decrypt( string $data )

Decrypt a block of data.

Parameter

string	$data
	data to decrypt.

Returns

string

The decrypted binary data.

encodeMime

public string encodeMime( string $data )

Encrypt a block of data after MIME-encoding it.

Parameter

string	$data
	data to encrypt.

Returns

string

The encrypted mime-encoded data.

decodeMime

public string decodeMime( string $data )

Decrypt a block of data and then MIME-decode it.

Parameter

string	$data
	data to decrypt.

Returns

string

The decrypted mime-decoded data.

encodeMimeSelfRand

public void encodeMimeSelfRand( string $data )

Encrypt a block of data after MIME-encoding it, and include the
random hash in the final output in plaintext so it can beretrieved and decrypted with only the secret key bydecodeMimeSelfRand().

Parameter

string	$data
	data to encrypt.

Returns

void

decodeMimeSelfRand

public string decodeMimeSelfRand( string $data )

Decrypt a block of data and then MIME-decode it, using the
random key stored in beginning of the ciphertext generated byencodeMimeSelfRand().

Parameter

string	$data
	data to decrypt, in the format: randkey#encrypted_data.

Returns

string

The decrypted, mime-decoded data.

Private Method Details

binmd5

private string binmd5( string $string )

Implment md5 hashing in php, though use the mhash() function if it is available.

Parameter

string	$string
	string to hash.

Returns

string

The md5 mhash of the string.

array2pack

private string array2pack( array $array )

Turn an array into a binary packed string.

Parameter

array	$array
	array to pack.

Returns

string

The binary packed representation of the array.

newKey

private void newKey( string $round )

Generate a new key for a new encryption block.

Parameter

string	$round
	basis for the key.

Returns

void

Private Field Details
$key
private string $key >><< The first key to use. This should be a shared secret.

$rand
private long $rand >><< The second key to use. This should be a randomly generated block of bytes.