Java Util类代码示例

import javacard.framework.Util; //导入依赖的package包/类
/**
* Copies {@code other} into this. No size requirements. If {@code other}
* has more digits then the superfluous leading digits of {@code other} are
* asserted to be zero. If this bignat has more digits than its leading
* digits are correctly initilized to zero. This function will not change size 
* attribute of this object.
* 
* @param other
*            Bignat to copy into this object.
*/
public void copy(Bignat other) {
    short this_start, other_start, len;
    if (this.size >= other.size) {
        this_start = (short) (this.size - other.size);
        other_start = 0;
        len = other.size;
    } else {
        this_start = 0;
        other_start = (short) (other.size - this.size);
        len = this.size;
        // Verify here that other have leading zeroes up to other_start
        for (short i = 0; i < other_start; i ++) {
            if (other.value[i] != 0) {
                ISOException.throwIt(ReturnCodes.SW_BIGNAT_INVALIDCOPYOTHER);
            }
        }
    }

    if (this_start > 0) {
        // if this bignat has more digits than its leading digits are initilized to zero
        Util.arrayFillNonAtomic(this.value, (short) 0, this_start, (byte) 0);
    }
    Util.arrayCopyNonAtomic(other.value, other_start, this.value, this_start, len);
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Copies content of {@code other} into this and set size of this to {@code other}. 
 * The size attribute (returned by length()) is updated. If {@code other}
 * is longer than maximum capacity of this, internal buffer is reallocated if enabled 
 * (ALLOW_RUNTIME_REALLOCATION), otherwise exception is thrown.
 * @param other 
 *            Bignat to clone into this object.
 */    
public void clone(Bignat other) { 
    // Reallocate array only if current array cannot store the other value and reallocation is enabled by ALLOW_RUNTIME_REALLOCATION
    if (this.max_size < other.length()) {
        // Reallocation necessary
        if (ALLOW_RUNTIME_REALLOCATION) {
            allocate_storage_array(other.length(), this.allocatorType);
        }
        else {
            ISOException.throwIt(ReturnCodes.SW_BIGNAT_REALLOCATIONNOTALLOWED);
        }
    }
    
    // copy value from other into proper place in this (this can be longer than other so rest of bytes wil be filled with 0)
    other.copy_to_buffer(this.value, (short) 0);
    if (this.max_size > other.length()) {
        Util.arrayFillNonAtomic(this.value, other.length(), (short) (this.max_size - other.length()), (byte) 0);
    }
    this.size = other.length();
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Compares this and provided point for equality. The comparison is made using hash of both values to prevent leak of position of mismatching byte.
 * @param other second point for comparison
 * @return true if both point are exactly equal (same length, same value), false otherwise
 */
public boolean isEqual(ECPoint other) {
    boolean bResult = false;
    if (this.length() != other.length()) {
        return false;
    } 
    else {
        // The comparison is made with hash of point values instead of directly values. 
        // This way, offset of first mismatching byte is not leaked via timing side-channel. 
        // Additionally, only single array is required for storage of plain point values thus saving some RAM.            
        ech.lock(ech.uncompressed_point_arr1);
        ech.lock(ech.fnc_isEqual_hashArray);
        //ech.lock(ech.fnc_isEqual_hashEngine);
        short len = this.getW(ech.uncompressed_point_arr1, (short) 0);
        ech.fnc_isEqual_hashEngine.doFinal(ech.uncompressed_point_arr1, (short) 0, len, ech.fnc_isEqual_hashArray, (short) 0);
        len = other.getW(ech.uncompressed_point_arr1, (short) 0);
        len = ech.fnc_isEqual_hashEngine.doFinal(ech.uncompressed_point_arr1, (short) 0, len, ech.uncompressed_point_arr1, (short) 0);
        bResult = Util.arrayCompare(ech.fnc_isEqual_hashArray, (short) 0, ech.uncompressed_point_arr1, (short) 0, len) == 0;
        //ech.unlock(ech.fnc_isEqual_hashEngine);
        ech.unlock(ech.fnc_isEqual_hashArray);
        ech.unlock(ech.uncompressed_point_arr1);
    }

    return bResult;
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Erase all values stored in helper objects
 */
void erase() {
    helper_BN_A.erase();
    helper_BN_B.erase();
    helper_BN_C.erase();
    helper_BN_D.erase();
    helper_BN_E.erase();
    helper_BN_F.erase();
    
    helperEC_BN_A.erase();
    helperEC_BN_B.erase();
    helperEC_BN_C.erase();
    helperEC_BN_D.erase();
    helperEC_BN_E.erase();
    helperEC_BN_F.erase();
    

    Util.arrayFillNonAtomic(helper_BN_array1, (short) 0, (short) helper_BN_array1.length, (byte) 0);
    Util.arrayFillNonAtomic(helper_BN_array2, (short) 0, (short) helper_BN_array2.length, (byte) 0);
    Util.arrayFillNonAtomic(helper_uncompressed_point_arr1, (short) 0, (short) helper_uncompressed_point_arr1.length, (byte) 0);
}
 

import javacard.framework.Util; //导入依赖的package包/类
void test_EC_SETCURVE_G(APDU apdu, short dataLen) {
     byte[] apdubuf = apdu.getBuffer();
     
     Util.arrayCopyNonAtomic(apdubuf, ISO7816.OFFSET_CDATA, m_customG, (short) 0, dataLen);
     PM.check(PM.TRAP_EC_SETCURVE_1);

     if (apdubuf[ISO7816.OFFSET_P2] == 1) { // If required, complete new custom curve and point is allocated
         m_testCurveCustom = new ECCurve(false, SecP256r1.p, SecP256r1.a, SecP256r1.b, m_customG, SecP256r1.r);
         m_testPointCustom = new ECPoint(m_testCurveCustom, m_ecc.ech);
         PM.check(PM.TRAP_EC_SETCURVE_2);
         // Release unused previous objects
         if (!bIsSimulator) {
             JCSystem.requestObjectDeletion();
         }
     }
     else {
         // Otherwise, only G is set and relevant objects are updated
         m_testCurveCustom.setG(apdubuf, (short) ISO7816.OFFSET_CDATA, m_testCurveCustom.POINT_SIZE);
         m_testPointCustom.updatePointObjects(); // After changing curve parameters, internal objects needs to be actualized
     }
}
 

import javacard.framework.Util; //导入依赖的package包/类
public boolean unwrap(byte[] keyHandle, short keyHandleOffset, short keyHandleLength, byte[] applicationParameter, short applicationParameterOffset, ECPrivateKey unwrappedPrivateKey) {
	
	calcMAC(applicationParameter, applicationParameterOffset, keyHandle, keyHandleOffset);
	
	//Compare MAC
	if (Util.arrayCompare(scratch, (short) 0, keyHandle, (short)(keyHandleOffset+32), (short)32)!=0) {
		return false;
	}
	
	//only get key if signing is required
    if (unwrappedPrivateKey != null) {

    	//Regenerate PrivKey 
    	generatePrivateKey(applicationParameter, applicationParameterOffset, keyHandle, keyHandleOffset);
    	
        unwrappedPrivateKey.setS(scratch, (short)0, (short)32);
    }
    Util.arrayFillNonAtomic(scratch, (short)0, (short)32, (byte)0x00);
    return true;
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Converts up to 8 byte value to BCD array.
 * Lenght of array + outOffset should be always >= 10.
 * Number is considered to be big-endian.
 * Output array can be same as input array.
 * 
 * @param input Byte array containing number ot convert
 * @param inOffset Start index of number in input array
 * @param inLenght Length of number in bytes
 * @param out Byte array that will be filled with BCD values. 
 * @param outOffset Start index of output array.
 * @return Number of digits. Curretly always 10.
 */
public static short toBCD(byte[] input, short inOffset, short inLenght, byte[] out, short outOffset){
    Util.arrayFillNonAtomic(buffer, (short) 0, (short) buffer.length, (byte) 0x00);
    for(short index = inOffset; index < (short)(inOffset + inLenght); index++){
        short bytePosition = (short)(index - inOffset);
        short bytePositionFromLeft = (short)(inLenght - bytePosition - 1);
        for(short bitPosition = 0; bitPosition < 8; bitPosition++){
            if(((input[index] >> (7 - bitPosition)) & 1) > 0){
                add(buffer, bcdValues, (short)((bytePositionFromLeft * 8 + (7 - bitPosition)) * 10));
            }
            
        }
    }
    Util.arrayCopyNonAtomic(buffer, (short) 0, out, outOffset, (short) 10);
    Util.arrayFillNonAtomic(buffer, (short) 0, (short) buffer.length, (byte) 0); // Cleaning buffer, as static variables are not protected by firewall
    return 10; //TODO
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Converts array containing ASCII values binary array.
 * Output length should be at least half the length of input.
 * @param input ASCII array
 * @param inOffset Starting index of input
 * @param inLenght Length of input
 * @param output Array to store binary values. Starts at 0
 */
public static void asciiToHex(byte[] input, short inOffset, short inLenght, byte[] output){
    Util.arrayFillNonAtomic(output, (short) 0, (short) (inLenght/2 + inLenght % 2), (byte) 0);
    byte alignment = (byte) (inLenght % 2);
    byte shift, ialign;
    byte in;
    for(short i = (short) 0; i < inLenght; i++){
        ialign = (byte) ((byte)(i + alignment)/2);
        in = output[(byte)((byte)(i + alignment)/2)];
        if((short)((short)(i + alignment) % (short)2) == (short) 0){
            shift = (byte) 4;
        }else{
            shift = (byte) 0;
        }
        output[ialign] = (byte) (in | (byte)(asciiToBcd(input[(short)(inOffset + i)]) << shift));
    }
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * 
 * @param key Shared secret to use when generating HMAC
 * @param keyLen Length of shared secret in bytes
 * @param digits Numbers of digits to generate
 */
public HMACgenerator(byte key[], short keyLen, short digits){
    
    //Set counter to 0
    counter = new byte[counterSize];
    Util.arrayFillNonAtomic(counter, (short) 0, counterSize, (byte) 0);
    
    k_opad = new byte[64];
    k_ipad = new byte[64];
    shaBuffer = new byte[84];
    outBuffer = new byte[20];
    this.digits = digits;
    asciiBuffer = new byte[10];
    outputCodeDigits = new byte[digits];
    for (short i = (short) 0; i < (short) 64; i++){
        if(i < keyLen){
            k_opad[i] = (byte) (key[i] ^ 0x5c);
            k_ipad[i] = (byte) (key[i] ^ 0x36);
        } else {
            k_opad[i] = (byte) (0x5c);
            k_ipad[i] = (byte) (0x36);
        }
    }
    digest = MessageDigest.getInstance(MessageDigest.ALG_SHA, true);
    
}
 

import javacard.framework.Util; //导入依赖的package包/类
void test_EC_SETCURVE_G(APDU apdu, short dataLen) {
     byte[] apdubuf = apdu.getBuffer();
     
     Util.arrayCopyNonAtomic(apdubuf, ISO7816.OFFSET_CDATA, m_customG, (short) 0, dataLen);
     PM.check(PM.TRAP_EC_SETCURVE_1);

     if (apdubuf[ISO7816.OFFSET_P2] == 1) { // If required, complete new custom curve and point is allocated
         m_testCurveCustom = new ECCurve(false, SecP256r1.p, SecP256r1.a, SecP256r1.b, m_customG, SecP256r1.r, m_ecc);
         m_testPointCustom = new ECPoint(m_testCurveCustom, m_ecc);
         PM.check(PM.TRAP_EC_SETCURVE_2);
         // Release unused previous objects
         if (!bIsSimulator) {
             JCSystem.requestObjectDeletion();
         }
     }
     else {
         // Otherwise, only G is set and relevant objects are updated
         m_testCurveCustom.setG(apdubuf, (short) ISO7816.OFFSET_CDATA, m_testCurveCustom.POINT_SIZE);
         m_testPointCustom.updatePointObjects(); // After changing curve parameters, internal objects needs to be actualized
     }
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
* Copies {@code other} into this. No size requirements. If {@code other}
* has more digits then the superfluous leading digits of {@code other} are
* asserted to be zero. If this bignat has more digits than its leading
* digits are correctly initilized to zero. This function will not change size 
* attribute of this object.
* 
* @param other
*            Bignat to copy into this object.
*/
public void copy(Bignat other) {
    short this_start, other_start, len;
    if (this.size >= other.size) {
        this_start = (short) (this.size - other.size);
        other_start = 0;
        len = other.size;
    } else {
        this_start = 0;
        other_start = (short) (other.size - this.size);
        len = this.size;
        // Verify here that other have leading zeroes up to other_start
        for (short i = 0; i < other_start; i ++) {
            if (other.value[i] != 0) {
                ISOException.throwIt(ReturnCodes.SW_BIGNAT_INVALIDCOPYOTHER);
            }
        }
    }
    
    if (this_start > 0) {
        // if this bignat has more digits than its leading digits are initilized to zero
        Util.arrayFillNonAtomic(this.value, (short) 0, this_start, (byte) 0);
    }
    Util.arrayCopyNonAtomic(other.value, other_start, this.value, this_start, len);
}
 

import javacard.framework.Util; //导入依赖的package包/类
public void StoreCommitment(short id, byte[] commitment, short commitmentOffset, short commitmentLength) {
    state.CheckAllowedFunction(StateModel.FNC_QuorumContext_StoreCommitment);

    if (id < 0 || id == CARD_INDEX_THIS || id >= NUM_PLAYERS) {
        ISOException.throwIt(Consts.SW_INVALIDPLAYERINDEX);
    }
    if (commitmentLength != players[id].YsCommitment.length) {
        ISOException.throwIt(Consts.SW_INVALIDCOMMITMENTLENGTH);
    }
    if (players[id].bYsCommitmentValid) {
        // commitment already stored
        ISOException.throwIt(Consts.SW_COMMITMENTALREADYSTORED);
    }
    else {
        Util.arrayCopyNonAtomic(commitment, commitmentOffset, players[id].YsCommitment, (short) 0, commitmentLength);
        players[id].bYsCommitmentValid = true;
        num_commitments_count++;

        if (num_commitments_count == NUM_PLAYERS) {
            // All commitments were collected, allow for export of this card share
            state.MakeStateTransition(StateModel.STATE_KEYGEN_COMMITMENTSCOLLECTED);  
        }
        
    }
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Erase all values stored in helper objects
 */
void erase() {
    helper_BN_A.erase();
    helper_BN_B.erase();
    helper_BN_C.erase();
    helper_BN_D.erase();
    helper_BN_E.erase();
    helper_BN_F.erase();
    
    helperEC_BN_A.erase();
    helperEC_BN_B.erase();
    helperEC_BN_C.erase();
    helperEC_BN_D.erase();
    helperEC_BN_E.erase();
    helperEC_BN_F.erase();
    
    
    Util.arrayFillNonAtomic(helper_BN_array1, (short) 0, (short) helper_BN_array1.length, (byte) 0);
    Util.arrayFillNonAtomic(helper_BN_array2, (short) 0, (short) helper_BN_array2.length, (byte) 0);
    Util.arrayFillNonAtomic(helper_uncompressed_point_arr1, (short) 0, (short) helper_uncompressed_point_arr1.length, (byte) 0);
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Upon the generation of the triplet, the members perform a pairwise
 * exchange of their commitments by the end of which, they all hold a
 * set H = {h1,h2, ..,ht }. The commitment exchange terminates when |Hq | =
 * t ∀q ∈ Q
 * @param apdu 
 */
void KeyGen_StoreCommitment(APDU apdu) {
    byte[] apdubuf = apdu.getBuffer();
    short len = apdu.getIncomingLength();
    
    short paramsOffset = GetOperationParamsOffset(Consts.INS_KEYGEN_STORE_COMMITMENT, apdu);
    // Parse incoming apdu to obtain target quorum context
    QuorumContext quorumCtx = GetTargetQuorumContext(apdubuf, paramsOffset);
    // Verify authorization
    quorumCtx.VerifyCallerAuthorization(apdu, StateModel.FNC_QuorumContext_StoreCommitment);
    
    // Store provided commitment
    short playerId = Util.getShort(apdubuf, (short) (paramsOffset + Consts.PACKET_PARAMS_KEYGENSTORECOMMITMENT_PLAYERID_OFFSET));
    short commitmentLen = Util.getShort(apdubuf, (short) (paramsOffset + Consts.PACKET_PARAMS_KEYGENSTORECOMMITMENT_COMMITMENTLENGTH_OFFSET));
    quorumCtx.StoreCommitment(playerId, apdubuf, (short) (paramsOffset + Consts.PACKET_PARAMS_KEYGENSTORECOMMITMENT_COMMITMENT_OFFSET), commitmentLen);
}
 

import javacard.framework.Util; //导入依赖的package包/类
/**
 * Returns this card public key share
 * @param commitmentBuffer output buffer where to store commitment
 * @param commitmentOffset start offset within target output buffer
 * @return 
 */
public short GetYi(byte[] commitmentBuffer, short commitmentOffset) {
    state.CheckAllowedFunction(StateModel.FNC_QuorumContext_GetYi);

    if (state.GetState() == StateModel.STATE_KEYGEN_COMMITMENTSCOLLECTED) {
        if (players[CARD_INDEX_THIS].bYsValid) {
            Util.arrayCopyNonAtomic(this_card_Ys, (short) 0, commitmentBuffer, commitmentOffset, (short) this_card_Ys.length);
            return (short) this_card_Ys.length;
        } else {
            ISOException.throwIt(Consts.SW_INVALIDYSHARE);
        }
    } else {
        ISOException.throwIt(Consts.SW_INCORRECTSTATE);
    }
    return 0;
}