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Diffstat (limited to 'core/src/main/java/org/bouncycastle/pqc/crypto/rainbow/Layer.java')
| -rw-r--r-- | core/src/main/java/org/bouncycastle/pqc/crypto/rainbow/Layer.java | 322 |
1 files changed, 0 insertions, 322 deletions
diff --git a/core/src/main/java/org/bouncycastle/pqc/crypto/rainbow/Layer.java b/core/src/main/java/org/bouncycastle/pqc/crypto/rainbow/Layer.java deleted file mode 100644 index ae76922c..00000000 --- a/core/src/main/java/org/bouncycastle/pqc/crypto/rainbow/Layer.java +++ /dev/null @@ -1,322 +0,0 @@ -package org.bouncycastle.pqc.crypto.rainbow; - -import java.security.SecureRandom; - -import org.bouncycastle.pqc.crypto.rainbow.util.GF2Field; -import org.bouncycastle.pqc.crypto.rainbow.util.RainbowUtil; -import org.bouncycastle.util.Arrays; - - -/** - * This class represents a layer of the Rainbow Oil- and Vinegar Map. Each Layer - * consists of oi polynomials with their coefficients, generated at random. - * <p> - * To sign a document, we solve a LES (linear equation system) for each layer in - * order to find the oil variables of that layer and to be able to use the - * variables to compute the signature. This functionality is implemented in the - * RainbowSignature-class, by the aid of the private key. - * <p> - * Each layer is a part of the private key. - * <p> - * More information about the layer can be found in the paper of Jintai Ding, - * Dieter Schmidt: Rainbow, a New Multivariable Polynomial Signature Scheme. - * ACNS 2005: 164-175 (http://dx.doi.org/10.1007/11496137_12) - */ -public class Layer -{ - private int vi; // number of vinegars in this layer - private int viNext; // number of vinegars in next layer - private int oi; // number of oils in this layer - - /* - * k : index of polynomial - * - * i,j : indices of oil and vinegar variables - */ - private short[/* k */][/* i */][/* j */] coeff_alpha; - private short[/* k */][/* i */][/* j */] coeff_beta; - private short[/* k */][/* i */] coeff_gamma; - private short[/* k */] coeff_eta; - - /** - * Constructor - * - * @param vi number of vinegar variables of this layer - * @param viNext number of vinegar variables of next layer. It's the same as - * (num of oils) + (num of vinegars) of this layer. - * @param coeffAlpha alpha-coefficients in the polynomials of this layer - * @param coeffBeta beta-coefficients in the polynomials of this layer - * @param coeffGamma gamma-coefficients in the polynomials of this layer - * @param coeffEta eta-coefficients in the polynomials of this layer - */ - public Layer(byte vi, byte viNext, short[][][] coeffAlpha, - short[][][] coeffBeta, short[][] coeffGamma, short[] coeffEta) - { - this.vi = vi & 0xff; - this.viNext = viNext & 0xff; - this.oi = this.viNext - this.vi; - - // the secret coefficients of all polynomials in this layer - this.coeff_alpha = coeffAlpha; - this.coeff_beta = coeffBeta; - this.coeff_gamma = coeffGamma; - this.coeff_eta = coeffEta; - } - - /** - * This function generates the coefficients of all polynomials in this layer - * at random using random generator. - * - * @param sr the random generator which is to be used - */ - public Layer(int vi, int viNext, SecureRandom sr) - { - this.vi = vi; - this.viNext = viNext; - this.oi = viNext - vi; - - // the coefficients of all polynomials in this layer - this.coeff_alpha = new short[this.oi][this.oi][this.vi]; - this.coeff_beta = new short[this.oi][this.vi][this.vi]; - this.coeff_gamma = new short[this.oi][this.viNext]; - this.coeff_eta = new short[this.oi]; - - int numOfPoly = this.oi; // number of polynomials per layer - - // Alpha coeffs - for (int k = 0; k < numOfPoly; k++) - { - for (int i = 0; i < this.oi; i++) - { - for (int j = 0; j < this.vi; j++) - { - coeff_alpha[k][i][j] = (short)(sr.nextInt() & GF2Field.MASK); - } - } - } - // Beta coeffs - for (int k = 0; k < numOfPoly; k++) - { - for (int i = 0; i < this.vi; i++) - { - for (int j = 0; j < this.vi; j++) - { - coeff_beta[k][i][j] = (short)(sr.nextInt() & GF2Field.MASK); - } - } - } - // Gamma coeffs - for (int k = 0; k < numOfPoly; k++) - { - for (int i = 0; i < this.viNext; i++) - { - coeff_gamma[k][i] = (short)(sr.nextInt() & GF2Field.MASK); - } - } - // Eta - for (int k = 0; k < numOfPoly; k++) - { - coeff_eta[k] = (short)(sr.nextInt() & GF2Field.MASK); - } - } - - /** - * This method plugs in the vinegar variables into the polynomials of this - * layer and computes the coefficients of the Oil-variables as well as the - * free coefficient in each polynomial. - * <p> - * It is needed for computing the Oil variables while signing. - * - * @param x vinegar variables of this layer that should be plugged into - * the polynomials. - * @return coeff the coefficients of Oil variables and the free coeff in the - * polynomials of this layer. - */ - public short[][] plugInVinegars(short[] x) - { - // temporary variable needed for the multiplication - short tmpMult = 0; - // coeff: 1st index = which polynomial, 2nd index=which variable - short[][] coeff = new short[oi][oi + 1]; // gets returned - // free coefficient per polynomial - short[] sum = new short[oi]; - - /* - * evaluate the beta-part of the polynomials (it contains no oil - * variables) - */ - for (int k = 0; k < oi; k++) - { - for (int i = 0; i < vi; i++) - { - for (int j = 0; j < vi; j++) - { - // tmp = beta * xi (plug in) - tmpMult = GF2Field.multElem(coeff_beta[k][i][j], x[i]); - // tmp = tmp * xj - tmpMult = GF2Field.multElem(tmpMult, x[j]); - // accumulate into the array for the free coefficients. - sum[k] = GF2Field.addElem(sum[k], tmpMult); - } - } - } - - /* evaluate the alpha-part (it contains oils) */ - for (int k = 0; k < oi; k++) - { - for (int i = 0; i < oi; i++) - { - for (int j = 0; j < vi; j++) - { - // alpha * xj (plug in) - tmpMult = GF2Field.multElem(coeff_alpha[k][i][j], x[j]); - // accumulate - coeff[k][i] = GF2Field.addElem(coeff[k][i], tmpMult); - } - } - } - /* evaluate the gama-part of the polynomial (containing no oils) */ - for (int k = 0; k < oi; k++) - { - for (int i = 0; i < vi; i++) - { - // gamma * xi (plug in) - tmpMult = GF2Field.multElem(coeff_gamma[k][i], x[i]); - // accumulate in the array for the free coefficients (per - // polynomial). - sum[k] = GF2Field.addElem(sum[k], tmpMult); - } - } - /* evaluate the gama-part of the polynomial (but containing oils) */ - for (int k = 0; k < oi; k++) - { - for (int i = vi; i < viNext; i++) - { // oils - // accumulate the coefficients of the oil variables (per - // polynomial). - coeff[k][i - vi] = GF2Field.addElem(coeff_gamma[k][i], - coeff[k][i - vi]); - } - } - /* evaluate the eta-part of the polynomial */ - for (int k = 0; k < oi; k++) - { - // accumulate in the array for the free coefficients per polynomial. - sum[k] = GF2Field.addElem(sum[k], coeff_eta[k]); - } - - /* put the free coefficients (sum) into the coeff-array as last column */ - for (int k = 0; k < oi; k++) - { - coeff[k][oi] = sum[k]; - } - return coeff; - } - - /** - * Getter for the number of vinegar variables of this layer. - * - * @return the number of vinegar variables of this layer. - */ - public int getVi() - { - return vi; - } - - /** - * Getter for the number of vinegar variables of the next layer. - * - * @return the number of vinegar variables of the next layer. - */ - public int getViNext() - { - return viNext; - } - - /** - * Getter for the number of Oil variables of this layer. - * - * @return the number of oil variables of this layer. - */ - public int getOi() - { - return oi; - } - - /** - * Getter for the alpha-coefficients of the polynomials in this layer. - * - * @return the coefficients of alpha-terms of this layer. - */ - public short[][][] getCoeffAlpha() - { - return coeff_alpha; - } - - /** - * Getter for the beta-coefficients of the polynomials in this layer. - * - * @return the coefficients of beta-terms of this layer. - */ - - public short[][][] getCoeffBeta() - { - return coeff_beta; - } - - /** - * Getter for the gamma-coefficients of the polynomials in this layer. - * - * @return the coefficients of gamma-terms of this layer - */ - public short[][] getCoeffGamma() - { - return coeff_gamma; - } - - /** - * Getter for the eta-coefficients of the polynomials in this layer. - * - * @return the coefficients eta of this layer - */ - public short[] getCoeffEta() - { - return coeff_eta; - } - - /** - * This function compares this Layer with another object. - * - * @param other the other object - * @return the result of the comparison - */ - public boolean equals(Object other) - { - if (other == null || !(other instanceof Layer)) - { - return false; - } - Layer otherLayer = (Layer)other; - - return vi == otherLayer.getVi() - && viNext == otherLayer.getViNext() - && oi == otherLayer.getOi() - && RainbowUtil.equals(coeff_alpha, otherLayer.getCoeffAlpha()) - && RainbowUtil.equals(coeff_beta, otherLayer.getCoeffBeta()) - && RainbowUtil.equals(coeff_gamma, otherLayer.getCoeffGamma()) - && RainbowUtil.equals(coeff_eta, otherLayer.getCoeffEta()); - } - - public int hashCode() - { - int hash = vi; - hash = hash * 37 + viNext; - hash = hash * 37 + oi; - hash = hash * 37 + Arrays.hashCode(coeff_alpha); - hash = hash * 37 + Arrays.hashCode(coeff_beta); - hash = hash * 37 + Arrays.hashCode(coeff_gamma); - hash = hash * 37 + Arrays.hashCode(coeff_eta); - - return hash; - } -} |