iaik.security.ec.common

Enum SecurityStrength

java.lang.Object

java.lang.Enum<SecurityStrength>

iaik.security.ec.common.SecurityStrength

All Implemented Interfaces:

Serializable, Comparable<SecurityStrength>

public enum SecurityStrength
extends Enum<SecurityStrength>

This enumeration defines the so-called security strengths in bits as specified by [1, Table 2].

References:

[1] NIST SP800-57 - Part 1, "Recommendation for Key Management", March 2007

[2] ANSI X9.62-2005, "American National Standard for Financial Services - The Elliptic Curve Digital Signature Algorithm (ECDSA)", ASC X9, November 2005.

[3] NIST SP800-90, "Recommendation for Random Number Generators", March 2007

Author:

Christian Hanser, Sebastian Ramacher

Enum Constant Summary

Enum Constants

Enum Constant and Description
S112_BITS Denotes a security strength of 112 bits.
S128_BITS Denotes a security strength of 128 bits.
S192_BITS Denotes a security strength of 192 bits.
S256_BITS Denotes a security strength of 256 bits.
S80_BITS Denotes a security strength of 80 bits.

Method Summary

Modifier and Type	Method and Description
int	getBits() Returns the security strength in bits of security.
static MessageDigest	getMessageDigest(SecurityStrength securityStrength) Returns an message digest instance whose security strength matches the given security strength (see [1, Table 3] and [2, Table D.1]).
static SecureRandom	getSecureRandom(SecurityStrength securityStrength) Returns an approved secure random number generator (HASH_DRBG [3]) whose security strength matches the given key size (see [1, Table 3] and [2, Table D.1]).
static SecurityStrength	getSecurityStrength(BigInteger order) Determines the security strength for a given key size as specified by [1, Table 2].
static SecurityStrength	getSecurityStrength(int keySize) Determines the security strength for a given key size as specified by [1, Table 2].
static SecurityStrength	valueOf(String name) Returns the enum constant of this type with the specified name.
static SecurityStrength[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

S80_BITS

public static final SecurityStrength S80_BITS

Denotes a security strength of 80 bits.

S112_BITS

public static final SecurityStrength S112_BITS

Denotes a security strength of 112 bits.

S128_BITS

public static final SecurityStrength S128_BITS

Denotes a security strength of 128 bits.

S192_BITS

public static final SecurityStrength S192_BITS

Denotes a security strength of 192 bits.

S256_BITS

public static final SecurityStrength S256_BITS

Denotes a security strength of 256 bits.

Method Detail

values

public static SecurityStrength[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (SecurityStrength c : SecurityStrength.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static SecurityStrength valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

getBits

public int getBits()

Returns the security strength in bits of security.

Returns:

the bits of security

getSecureRandom

public static SecureRandom getSecureRandom(SecurityStrength securityStrength)

Returns an approved secure random number generator (HASH_DRBG [3]) whose security strength matches the given key size (see [1, Table 3] and [2, Table D.1]).

Parameters:

securityStrength - the requested security strength

Returns:

a SecureRandom instance

getMessageDigest

public static MessageDigest getMessageDigest(SecurityStrength securityStrength)

Returns an message digest instance whose security strength matches the given security strength (see [1, Table 3] and [2, Table D.1]).

Parameters:

securityStrength - the requested security strength

Returns:

a MessageDigest instance

getSecurityStrength

public static SecurityStrength getSecurityStrength(BigInteger order)

Determines the security strength for a given key size as specified by [1, Table 2].

Parameters:

order - the order of the EC group

Returns:

the security strength

getSecurityStrength

public static SecurityStrength getSecurityStrength(int keySize)

Determines the security strength for a given key size as specified by [1, Table 2].

Parameters:

keySize - the key size in bits

Returns:

the security strength