Different algorithms are supported for the different functions provided by the Web Crypto API. Also, depending of the context, these algorithms needs parameters or they will raise a SyntaxError
. This pages lists the context, the available algorithms and the required parameters.
Key generation algorithms
AESCBC

It represents AES in Cipher Block Chaining mode. For key generation, it uses PKCS #7 as the padding method.
Key usages for keys generated with this method are restricted to
"encrypt"
,"decrypt"
,"wrapKey"
or"unwrapKey"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKey
.The
AESCBC
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"AESCBC"
."length"
, an unsigned integer containing the length of the key (in bits). If the value is not128
, 192 or 256, anOperationError
is thrown.
AESCTR

It represents AES in Counter Mode.
Key usages for keys generated with this method are restricted to
"encrypt"
,"decrypt"
,"wrapKey"
or"unwrapKey"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKey
.The
AESCBC
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"AESCTR"
."length"
, an unsigned integer containing the length of the key (in bits). If the value is not128
, 192 or 256, anOperationError
is thrown.
AESGCM

It represents AES in Galois/Counter Mode.
Key usages for keys generated with this method are restricted to
"encrypt"
,"decrypt"
,"wrapKey"
or"unwrapKey"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKey
.The
AESGCM
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"AESGCM"
."length"
, an unsigned integer containing the length of the key (in bits). If the value is not128
, 192 or 256, anOperationError
is thrown.
RSAOAEP

It represents RSAESOAEP algorithm, using a SHA hash functions and a MGF1 mask generating function.
Key usages for keys generated with this method are restricted to
"encrypt"
,"decrypt"
,"wrapKey"
or"unwrapKey"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKeyPair
.The
RSAOAEP
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"RSAOAEP"
."hash"
, aHashAlgorithmIdentifier
with the hash algorithm to use.
AESKW

It represents the key wrapping in AES algorithm.
Key usages for keys generated with this method are restricted to
"wrapKey"
or"unwrapKey"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKey
.The
AESKW
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"AESKW"
."length"
, an unsigned integer containing the length of the key (in bits). If the value is not128
, 192 or 256, anOperationError
is thrown.
HMAC

It represents the hashbased message authentication method using SHA hash functions.
Key usages for keys generated with this method are restricted to
"sign"
or"verify"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKey
.The
HMAC
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"HMAC"
."hash"
, aHashAlgorithmIdentifier
, the hash algorithm to use. "
length"
, an optional positive integer indicating the size of the key to generate. If not provided, the size of the block of the hash function is used.
RSASSAPKCS1v1_5

It represents RSASSAPKCS1v1_5 algorithm, using a SHA hash function.
Key usages for keys generated with this method are restricted to
"sign"
,"verify"
. If any other usage is requested for the key generated with this method, the key generation aborts with aSyntaxError
.The returned key is a
CryptoKeyPair
.The
RSASSAPKCS1v1_5
algorithm must be described using a dictionary with the following parameters:"name"
, aDOMString
containing"RSASSAPKCS1v1_5"
."hash"
, aHashAlgorithmIdentifier
with the hash algorithm to use.
ECDSA
 It represents the Elliptic Curve Digital Signature Algorithm.
 Key usages for keys generated with this method are restricted to
"sign"
,"verify"
.  The returned key is a
CryptoKeyPair
. 
The
ECDSA
must be described using a dictionary with the following parameters: ECDH
DH