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@TransactionType(value=SUPPORTS) public interface HMACKey
HMACKey contains a key for HMAC operations. This key can be of
any length, but it is strongly recommended that the key is not shorter than
the byte length of the hash output used in the HMAC implementation. Keys with
length greater than the hash block length are first hashed with the hash
algorithm used for the HMAC implementation.
Implementations must support an HMAC key length equal to the length of the supported hash algorithm block size (e.g 64 bytes for SHA-1)
When the key data is set, the key is initialized and ready for use.
KeyBuilder,
Signature,
javacardx.crypto.Cipher,
javacardx.crypto.KeyEncryption| Method Summary | |
|---|---|
byte |
getKey(byte[] keyData,
short kOff)
Returns the Key data in plain text. |
void |
setKey(byte[] keyData,
short kOff,
short kLen)
Sets the Key data. |
| Methods inherited from interface javacard.security.Key |
|---|
clearKey, getSize, getType, getTypeName, isInitialized |
| Method Detail |
|---|
void setKey(byte[] keyData,
short kOff,
short kLen)
throws CryptoException,
NullPointerException,
ArrayIndexOutOfBoundsException
Key data. The data format is big-endian and
right-aligned (the least significant bit is the least significant bit of
last byte). Input key data is copied into the internal representation.
Note:
javacardx.crypto.KeyEncryption
interface and the Cipher object specified via setKeyCipher()
is not null, keyData is decrypted using the Cipher object.
keyData - byte array containing key initialization datakOff - offset within keyData to startkLen - the byte length of the key initialization data
CryptoException - with the following reason code:
CryptoException.ILLEGAL_VALUE if the
kLen parameter is 0 or invalid or if the
keyData parameter is inconsistent with the key length
or if input data decryption is required and fails.
ArrayIndexOutOfBoundsException - if kOff is negative or the
keyData array is too short
NullPointerException - if the keyData parameter is
null
byte getKey(byte[] keyData,
short kOff)
Key data in plain text. The key can be any
length, but should be longer than the byte length of the hash algorithm
output used. The data format is big-endian and right-aligned (the least
significant bit is the least significant bit of last byte).
Note:
keyData buffer if
it fits.
Please use the getSize() method to obtain the actual key
length in bits.
keyData - byte array to return key datakOff - offset within keyData to start
CryptoException - with the following reason code:
CryptoException.UNINITIALIZED_KEY if
the key data has not been successfully initialized since
the time the initialized state of the key was set to
false.
Key
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