crypto
The
crypto   object
global   object
that
allows
using   cryptographic
functionality (since 0Z.O):
crypto.getRandomValues(typedArray)
Gets   cryptographically
strong random
values
Returns
the
same array
passed
typedArray
but
with
contents
replaced
with
the
newly
generated random numbers. Possible values:
typedArray
can be Int8Array, Intl6Array, Uintl6Array, Int32Array_
Uint32Array
crypto_
subtle
encrypt(algorithu_
key; data)
Encrypts data using the provided algorithw and key:
Returns
Promise
that fulfills with an ArrayBuffer containing the ciphertext:
Possible values:
algorithm
an
object   that   specifies
the   algorithm
be
used
and
extra
parameters If
required:
for RSA -
OAEP
pass the object with the following keys:
name is a string, should be set to RSA-OAEP:
crypto.subtle encrypt
{name:
RSA-OAEP" } ,
key ,
data)
for AES- CTR, pass the object with the following keys:
name IS a
string, should be set to AES-
CTR
counter IS
ArrayBuffer
TypedArray,
DataView
the
initial value of the counter block; must be 16 bytes long (the
AES block size) . The rightmost length bits of this block are
used for the counter; and the rest is used for the nonce_
For
example_
if length is set to 64, then the first half of counter is
the nonce and the second half is used for the counter
Length is the number of bits in the counter block that are used
for the actual counter: The counter must be big enough that it
doesn't wrap_
for AES-CBC
pass the object with the following keys:
name IS a
string, should be set to AES-
CBC
iv Or the initialization vector; is an ArrayBuffer,
TypedArray,
DataView,
must be 16
bytes,
unpredictable
and preferably
cryptographically random: However; it need not be secret; for
example
it may be transmitted unencrypted along with the
ciphertext.
for AES-GCM, pass the object with the following keys:
name IS a
string, should be set to AES-GCM
iv or the initialization vector; is an ArrayBuffer,
TypedArray:
DataView;
must be 16 bytes_
and must be unique for every
encryption operation carried out with a given key
additionalData (optional) is
an
ArrayBuffer,
TypedArray_
DataView
that
contains
additional
data
that
Will
not
encrypted but will be authenticated along with the encrypted
data
If additionalData is
specified, then the same data must
be
specified in the corresponding call to decrypt(): if the data
given to the decrypt () call does not match the original data,
any