javax.crypto.spec.GCMParameterSpec
Specifies the set of parameters required by a Cipher using the Galois/Counter Mode (GCM) mode.
Simple block cipher modes (such as CBC) generally require only an initialization vector (such as IvParameterSpec), but GCM needs these parameters:
IV: Initialization Vector (IV) tLen: length (in bits) of authentication tag T
In addition to the parameters described here, other GCM inputs/output (Additional Authenticated Data (AAD), Keys, block ciphers, plain/ciphertext and authentication tags) are handled in the Cipher class.
Please see RFC 5116
for more information on the Authenticated Encryption with
Associated Data (AEAD) algorithm, and
NIST Special Publication 800-38D, NIST Recommendation for Block Cipher Modes of Operation: Galois/Counter Mode (GCM) and GMAC.
The GCM specification states that tLen may only have the values {128, 120, 112, 104, 96}, or {64, 32} for certain applications. Other values can be specified for this class, but not all CSP implementations will support them.
Specifies the set of parameters required by a Cipher using the Galois/Counter Mode (GCM) mode.
Simple block cipher modes (such as CBC) generally require only an
initialization vector (such as IvParameterSpec),
but GCM needs these parameters:
IV: Initialization Vector (IV)
tLen: length (in bits) of authentication tag T
In addition to the parameters described here, other GCM inputs/output
(Additional Authenticated Data (AAD), Keys, block ciphers,
plain/ciphertext and authentication tags) are handled in the Cipher class.
Please see RFC 5116
for more information on the Authenticated Encryption with
Associated Data (AEAD) algorithm, and
NIST Special Publication 800-38D, `NIST Recommendation for Block
Cipher Modes of Operation: Galois/Counter Mode (GCM) and GMAC.`
The GCM specification states that tLen may only have the
values {128, 120, 112, 104, 96}, or {64, 32} for certain
applications. Other values can be specified for this class, but not
all CSP implementations will support them.->gcm-parameter-specclj
(->gcm-parameter-spec t-len src)(->gcm-parameter-spec t-len src offset len)Constructor.
Constructs a GCMParameterSpec object using the specified authentication tag bit-length and a subset of the specified buffer as the IV.
t-len - the authentication tag length (in bits) - int
src - the IV source buffer. The contents of the buffer are copied to protect against subsequent modification. - byte[]
offset - the offset in src where the IV starts - int
len - the number of IV bytes - int
throws: java.lang.IllegalArgumentException - if tLen is negative, src is null, len or offset is negative, or the sum of offset and len is greater than the length of the src byte array.
Constructor. Constructs a GCMParameterSpec object using the specified authentication tag bit-length and a subset of the specified buffer as the IV. t-len - the authentication tag length (in bits) - `int` src - the IV source buffer. The contents of the buffer are copied to protect against subsequent modification. - `byte[]` offset - the offset in src where the IV starts - `int` len - the number of IV bytes - `int` throws: java.lang.IllegalArgumentException - if tLen is negative, src is null, len or offset is negative, or the sum of offset and len is greater than the length of the src byte array.
get-ivclj
(get-iv this)Returns the Initialization Vector (IV).
returns: the IV. Creates a new array each time this method
is called. - byte[]
Returns the Initialization Vector (IV). returns: the IV. Creates a new array each time this method is called. - `byte[]`
get-t-lenclj
(get-t-len this)Returns the authentication tag length.
returns: the authentication tag length (in bits) - int
Returns the authentication tag length. returns: the authentication tag length (in bits) - `int`
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