diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/prng/drbg/DualECPoints.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/prng/drbg/DualECPoints.java | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/prng/drbg/DualECPoints.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/prng/drbg/DualECPoints.java deleted file mode 100644 index 04a8a5a00..000000000 --- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/prng/drbg/DualECPoints.java +++ /dev/null @@ -1,82 +0,0 @@ -package org.spongycastle.crypto.prng.drbg; - -import org.spongycastle.math.ec.ECPoint; - -/** - * General class for providing point pairs for use with DualEC DRBG. See NIST SP 800-90A for further details. - */ -public class DualECPoints -{ - private final ECPoint p; - private final ECPoint q; - private final int securityStrength; - private final int cofactor; - - /** - * Base Constructor. - * <p> - * The cofactor is used to calculate the output block length (maxOutlen) according to - * <pre> - * max_outlen = largest multiple of 8 less than ((field size in bits) - (13 + log2(cofactor)) - * </pre> - * </p> - * @param securityStrength maximum security strength to be associated with these parameters - * @param p the P point. - * @param q the Q point. - * @param cofactor cofactor associated with the domain parameters for the point generation. - */ - public DualECPoints(int securityStrength, ECPoint p, ECPoint q, int cofactor) - { - if (!p.getCurve().equals(q.getCurve())) - { - throw new IllegalArgumentException("points need to be on the same curve"); - } - - this.securityStrength = securityStrength; - this.p = p; - this.q = q; - this.cofactor = cofactor; - } - - public int getSeedLen() - { - return p.getCurve().getFieldSize(); - } - - public int getMaxOutlen() - { - return ((p.getCurve().getFieldSize() - (13 + log2(cofactor))) / 8) * 8; - } - - public ECPoint getP() - { - return p; - } - - public ECPoint getQ() - { - return q; - } - - public int getSecurityStrength() - { - return securityStrength; - } - - public int getCofactor() - { - return cofactor; - } - - private static int log2(int value) - { - int log = 0; - - while ((value >>= 1) != 0) - { - log++; - } - - return log; - } -} |