const type: cipherAlgorithm

Enumeration of cipher algorithms. Currently the ciphers NO_CIPHER, RC4, DES, TDES, BLOWFISH, AES and AES_GCM are supported.

const type: cipherState

Interface type for the internal state of a cipher. The cipherState interface is implemented with arc4, des, tdes, blowfish, aes, aes_gcm and noCipher (no encryption).

const type: noCipherState

cipherState implementation type describing the state if no cipher is used. The data remains unencrypted if NO_CIPHER is used.

const func integer: blockSize (in cipherAlgorithm: cipherAlg)

Block size used by the given cipherAlgorithm. Stream ciphers have a block size of 0.

Returns:

the block size used by the cipherAlgorithm.

const func cipherState: setCipherKey (in cipherAlgorithm: cipherAlg, in string: cipherKey, in string: initializationVector)

Set key and initialization vector for the given cipherAlgorithm.

Parameters:

cipherAlg - The cipherAlgorithm to be used.

Returns:

the cipherState of the cipherAlgorithm.

const proc: initAead (inout cipherState: state, in string: recordTypeAndVersion, in integer: sequenceNumber)

Initialize the authenticated encryption with associated data (AEAD). For all other cipher algorithms this function does nothing.

const func string: getComputedMac (in cipherState: state)

Obtain the computed MAC of data that has been decrypted with an AEAD cipher. For all other cipher algorithms this function raises an exception. After a successful decryption with an AEAD cipher getComputedMac and getMac should return the same value.

const func string: getMac (in cipherState: state)

Obtain the MAC that is appended to the encrypted data of an AEAD cipher. For all other cipher algorithms this function raises an exception. After a successful decryption with an AEAD cipher getComputedMac and getMac should return the same value.

const func string: encode (inout cipherState: state, in string: plaintext)

Encode a string with the state of the selected cipher algorithm.

Returns:

the encoded string.

const func string: decode (inout cipherState: state, in string: encoded)

Decode a string with the state of the selected cipher algorithm.

Returns:

the decoded string.