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Bouncy Castle Cryptography Library 1.49 | ||||||||
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java.lang.Objectorg.bouncycastle.pqc.crypto.rainbow.util.GF2Field
public class GF2Field
This class provides the basic operations like addition, multiplication and finding the multiplicative inverse of an element in GF2^8.
The operations are implemented using the irreducible polynomial 1+x^2+x^3+x^6+x^8 ( 1 0100 1101 = 0x14d ) This class makes use of lookup tables(exps and logs) for implementing the operations in order to increase the efficiency of Rainbow.
Field Summary | |
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static int |
MASK
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Constructor Summary | |
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GF2Field()
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Method Summary | |
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static short |
addElem(short x,
short y)
This function calculates the sum of two elements as an operation in GF2^8 |
static short |
getExp(short x)
This function returns the values of exps-lookup table which correspond to the input |
static short |
getLog(short x)
This function returns the values of logs-lookup table which correspond to the input |
static short |
invElem(short x)
This function computes the multiplicative inverse of a given element in GF2^8 The 0 has no multiplicative inverse and in this case 0 is returned. |
static short |
multElem(short x,
short y)
This function multiplies two elements in GF2^8. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int MASK
Constructor Detail |
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public GF2Field()
Method Detail |
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public static short addElem(short x, short y)
x
- the first element that is to be addedy
- the second element that should be add
public static short invElem(short x)
x
- the element which multiplicative inverse is to be computed
public static short multElem(short x, short y)
x
- the first element to be multiplied.y
- the second element to be multiplied.
public static short getExp(short x)
x
- the index in the lookup table exps
public static short getLog(short x)
x
- the index in the lookup table logs
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Bouncy Castle Cryptography Library 1.49 | ||||||||
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