dw.crypto
Class WeakMac
dw.crypto.WeakMac
This API provides access to Deprecated algorithms.
See Mac for full documentation. WeakMac is simply a drop-in replacement that only supports deprecated algorithms. This is helpful when you need to deal with weak algorithms for backward compatibility purposes, but Mac should always be used for new development and for anything intended to be secure.
This class provides the functionality of a "Message Authentication Code" (MAC) algorithm. A MAC provides a way to check the integrity of information transmitted over or stored in an unreliable medium, based on a secret key. Typically, message authentication codes are used between two parties that share a secret key in order to validate information transmitted between these parties. A MAC mechanism that is based on cryptographic hash functions is referred to as HMAC. HMAC can be used with any cryptographic hash function, e.g., SHA256, in combination with a secret shared key. HMAC is specified in RFC 2104.
Note: this class handles sensitive security-related data. Pay special attention to PCI DSS v3. requirements 2, 4, and 12.
Constants
HMAC_MD5
:
String = "HmacMD5"
Constant representing the HMAC-MD5 keyed-hashing algorithm as defined in RFC 2104 "HMAC: Keyed-Hashing for Message Authentication" (February 1997).
This algorithm uses as MD5 cryptographic hash function.
This algorithm is obsolete. Do not use it for any sensitive data
HMAC_SHA_1
:
String = "HmacSHA1"
Constant representing the HmacSHA1 algorithms as defined in RFC 2104 "HMAC: Keyed-Hashing for Message Authentication" (February 1997)
with SHA-1 as the message digest algorithm.
This algorithm is obsolete. Do not use it for any sensitive data
Properties
Constructor Summary
Method Summary
digest(input
:
String, key
:
String)
:
Bytes
Computes the hash value for the passed string input using the passed secret key.
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Methods inherited from class
Object
assign, create, create, defineProperties, defineProperty, entries, freeze, fromEntries, getOwnPropertyDescriptor, getOwnPropertyNames, getOwnPropertySymbols, getPrototypeOf, hasOwnProperty, is, isExtensible, isFrozen, isPrototypeOf, isSealed, keys, preventExtensions, propertyIsEnumerable, seal, setPrototypeOf, toLocaleString, toString, valueOf, values
Constructor Detail
WeakMac
public WeakMac(algorithm
:
String)
Construct a Mac encryption instance with the specified algorithm name. The
supported algorithms are:
- HmacMD5
- HmacSHA1
Parameters:
algorithm
-
the standard name of the digest algorithm, must not be null.
Throws:
NullArgumentException
-
if algorithm is null.
IllegalArgumentException
-
if the specified algorithm name is not supported.
Method Detail
digest
Computes the hash value for the passed string input using the passed secret key.
Given input and the given key will be first converted with UTF-8 encoding into a byte array.
The resulting hash is typically converted with base64 back into a string.
Parameters:
input
-
A string to calculate a RFC 2104 compliant HMAC hash value for.
key
-
The secret key ready for use with the algorithm. The key's format depends on the chosen algorithm and the keys are assumed to be correctly formulated for the algorithm used, for example that the lengths are correct. Keys are not checked for validity. Only such keys that have no key parameters associated with them.
Returns:
The resulting hash value as bytes.
Throws:
IllegalArgumentException
-
if algorithm is not null and the specified algorithm name is not supported.
digest
Computes the hash value for the passed string input using the passed secret key.
Given input will be first converted with UTF-8 encoding into a byte array.
The resulting hash is typically converted with base64 back into a string.
Parameters:
input
-
A string to calculate a RFC 2104 compliant HMAC hash value for.
key
-
The secret key as bytes ready for use with the algorithm. The key's format depends on the chosen algorithm and the keys are assumed to be correctly formulated for the algorithm used, for example that the lengths are correct. Keys are not checked for validity. Only such keys that have no key parameters associated with them.
Returns:
The resulting hash value as bytes.
Throws:
IllegalArgumentException
-
if algorithm is not null and the specified algorithm name is not supported.
digest
Computes the hash value for the passed bytes input using the passed secret key.
Parameters:
input
-
The bytes to calculate a RFC 2104 compliant HMAC hash value.
key
-
The secret key as byte array ready for use with the algorithm. The key's format depends on the chosen algorithm and the keys are assumed to be correctly formulated for the algorithm used, for example that the lengths are correct. Keys are not checked for validity. Only such keys that have no key parameters associated with them.
Returns:
The resulting hash value as bytes.
Throws:
IllegalArgumentException
-
if algorithm is not null and the specified algorithm name is not supported.
