public Class Checksum

Encodes a Checksum object.

Checksum    ::= SEQUENCE {
        cksumtype   [0] Int32,
        checksum    [1] OCTET STRING
}

This definition reflects the Network Working Group RFC 4120 specification available at http://www.ietf.org/rfc/rfc4120.txt.

Returns:byte[]

byte array of encoded Checksum.

Exceptions

Asn1Exception:

if an error occurs while decoding an ASN1 encoded data.

IOException:

if an I/O error occurs while reading encoded data.

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Annotations

@Override

Returns the raw bytes of the checksum, not in ASN.1 encoded form.

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Annotations

@Override

Parse (unmarshal) a checksum object from a DER input stream. This form parsing might be used when expanding a value which is part of a constructed sequence and uses explicitly tagged type.

Parameters

data:DerInputStream

the Der input stream value, which contains one or more marshaled value.

explicitTag:byte

tag number.

optional:boolean

indicates if this data field is optional

Returns:Checksum

an instance of Checksum.

Exceptions

Asn1Exception:

if an error occurs while decoding an ASN1 encoded data.

IOException:

if an I/O error occurs while reading encoded data.

Verifies the checksum over the data passed in. The checksum might be a keyed or not. =============== ATTENTION! Use with care ================== According to https://tools.ietf.org/html/rfc3961#section-6.1, An unkeyed checksum should only be used "in limited circumstances where the lack of a key does not provide a window for an attack, preferably as part of an encrypted message".