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src/java.base/share/classes/com/sun/crypto/provider/GHASH.java

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 111             // Conditional reduction.
 112             V0 ^= 0xe100000000000000L & mask;
 113             X <<= 1;
 114         }
 115 
 116         // calculate Z128
 117         long mask = X >> 63;
 118         Z0 ^= V0 & mask;
 119         Z1 ^= V1 & mask;
 120 
 121         // Save result.
 122         st[0] = Z0;
 123         st[1] = Z1;
 124 
 125     }
 126 
 127     /* subkeyH and state are stored in long[] for GHASH intrinsic use */
 128 
 129     // hash subkey H; should not change after the object has been constructed
 130     private final long[] subkeyH;


 131 
 132     // buffer for storing hash
 133     private final long[] state;
 134 
 135     // variables for save/restore calls
 136     private long stateSave0, stateSave1;
 137 
 138     /**
 139      * Initializes the cipher in the specified mode with the given key
 140      * and iv.
 141      *
 142      * @param subkeyH the hash subkey
 143      *
 144      * @exception ProviderException if the given key is inappropriate for
 145      * initializing this digest
 146      */
 147     GHASH(byte[] subkeyH) throws ProviderException {
 148         if ((subkeyH == null) || subkeyH.length != AES_BLOCK_SIZE) {
 149             throw new ProviderException("Internal error");
 150         }
 151         state = new long[2];

 152         this.subkeyH = new long[2];
 153         this.subkeyH[0] = getLong(subkeyH, 0);
 154         this.subkeyH[1] = getLong(subkeyH, 8);






 155     }
 156 
 157     /**
 158      * Resets the GHASH object to its original state, i.e. blank w/
 159      * the same subkey H. Used after digest() is called and to re-use
 160      * this object for different data w/ the same H.
 161      */
 162     void reset() {
 163         state[0] = 0;
 164         state[1] = 0;
 165     }
 166 
 167     /**
 168      * Save the current snapshot of this GHASH object.
 169      */
 170     void save() {
 171         stateSave0 = state[0];
 172         stateSave1 = state[1];
 173     }
 174 


 177      */
 178     void restore() {
 179         state[0] = stateSave0;
 180         state[1] = stateSave1;
 181     }
 182 
 183     private static void processBlock(byte[] data, int ofs, long[] st, long[] subH) {
 184         st[0] ^= getLong(data, ofs);
 185         st[1] ^= getLong(data, ofs + 8);
 186         blockMult(st, subH);
 187     }
 188 
 189     void update(byte[] in) {
 190         update(in, 0, in.length);
 191     }
 192 
 193     void update(byte[] in, int inOfs, int inLen) {
 194         if (inLen == 0) {
 195             return;
 196         }
 197         ghashRangeCheck(in, inOfs, inLen, state, subkeyH);
 198         processBlocks(in, inOfs, inLen/AES_BLOCK_SIZE, state, subkeyH);
 199     }
 200 
 201     private static void ghashRangeCheck(byte[] in, int inOfs, int inLen, long[] st, long[] subH) {
 202         if (inLen < 0) {
 203             throw new RuntimeException("invalid input length: " + inLen);
 204         }
 205         if (inOfs < 0) {
 206             throw new RuntimeException("invalid offset: " + inOfs);
 207         }
 208         if (inLen > in.length - inOfs) {
 209             throw new RuntimeException("input length out of bound: " +
 210                                        inLen + " > " + (in.length - inOfs));
 211         }
 212         if (inLen % AES_BLOCK_SIZE != 0) {
 213             throw new RuntimeException("input length/block size mismatch: " +
 214                                        inLen);
 215         }
 216 
 217         // These two checks are for C2 checking
 218         if (st.length != 2) {
 219             throw new RuntimeException("internal state has invalid length: " +
 220                                        st.length);
 221         }
 222         if (subH.length != 2) {
 223             throw new RuntimeException("internal subkeyH has invalid length: " +
 224                                        subH.length);
 225         }
 226     }
 227     /*
 228      * This is an intrinsified method.  The method's argument list must match
 229      * the hotspot signature.  This method and methods called by it, cannot
 230      * throw exceptions or allocate arrays as it will breaking intrinsics
 231      */
 232     @HotSpotIntrinsicCandidate
 233     private static void processBlocks(byte[] data, int inOfs, int blocks, long[] st, long[] subH) {
 234         int offset = inOfs;
 235         while (blocks > 0) {
 236             processBlock(data, offset, st, subH);
 237             blocks--;
 238             offset += AES_BLOCK_SIZE;
 239         }
 240     }
 241 
 242     byte[] digest() {
 243         byte[] result = new byte[AES_BLOCK_SIZE];
 244         putLong(result, 0, state[0]);


 111             // Conditional reduction.
 112             V0 ^= 0xe100000000000000L & mask;
 113             X <<= 1;
 114         }
 115 
 116         // calculate Z128
 117         long mask = X >> 63;
 118         Z0 ^= V0 & mask;
 119         Z1 ^= V1 & mask;
 120 
 121         // Save result.
 122         st[0] = Z0;
 123         st[1] = Z1;
 124 
 125     }
 126 
 127     /* subkeyH and state are stored in long[] for GHASH intrinsic use */
 128 
 129     // hash subkey H; should not change after the object has been constructed
 130     private final long[] subkeyH;
 131     // subkeyHtbl holds 2*9 powers of subkeyH computed using carry-less multiplication
 132     private long[] subkeyHtbl;
 133 
 134     // buffer for storing hash
 135     private final long[] state;
 136 
 137     // variables for save/restore calls
 138     private long stateSave0, stateSave1;
 139 
 140     /**
 141      * Initializes the cipher in the specified mode with the given key
 142      * and iv.
 143      *
 144      * @param subkeyH the hash subkey
 145      *
 146      * @exception ProviderException if the given key is inappropriate for
 147      * initializing this digest
 148      */
 149     GHASH(byte[] subkeyH) throws ProviderException {
 150         if ((subkeyH == null) || subkeyH.length != AES_BLOCK_SIZE) {
 151             throw new ProviderException("Internal error");
 152         }
 153         state = new long[2];
 154         subkeyHtbl = new long[2*9];
 155         this.subkeyH = new long[2];
 156         this.subkeyH[0] = getLong(subkeyH, 0);
 157         this.subkeyH[1] = getLong(subkeyH, 8);
 158         subkeyHtbl[0] = this.subkeyH[0];
 159         subkeyHtbl[1] = this.subkeyH[1];
 160         for (int i = 1; i < 9 ; i++) {
 161             subkeyHtbl[2*i] = 0;
 162             subkeyHtbl[2*i+1] = 0;
 163         }
 164     }
 165 
 166     /**
 167      * Resets the GHASH object to its original state, i.e. blank w/
 168      * the same subkey H. Used after digest() is called and to re-use
 169      * this object for different data w/ the same H.
 170      */
 171     void reset() {
 172         state[0] = 0;
 173         state[1] = 0;
 174     }
 175 
 176     /**
 177      * Save the current snapshot of this GHASH object.
 178      */
 179     void save() {
 180         stateSave0 = state[0];
 181         stateSave1 = state[1];
 182     }
 183 


 186      */
 187     void restore() {
 188         state[0] = stateSave0;
 189         state[1] = stateSave1;
 190     }
 191 
 192     private static void processBlock(byte[] data, int ofs, long[] st, long[] subH) {
 193         st[0] ^= getLong(data, ofs);
 194         st[1] ^= getLong(data, ofs + 8);
 195         blockMult(st, subH);
 196     }
 197 
 198     void update(byte[] in) {
 199         update(in, 0, in.length);
 200     }
 201 
 202     void update(byte[] in, int inOfs, int inLen) {
 203         if (inLen == 0) {
 204             return;
 205         }
 206         ghashRangeCheck(in, inOfs, inLen, state, subkeyHtbl);
 207         processBlocks(in, inOfs, inLen/AES_BLOCK_SIZE, state, subkeyHtbl);
 208     }
 209 
 210     private static void ghashRangeCheck(byte[] in, int inOfs, int inLen, long[] st, long[] subkeyHtbl) {
 211         if (inLen < 0) {
 212             throw new RuntimeException("invalid input length: " + inLen);
 213         }
 214         if (inOfs < 0) {
 215             throw new RuntimeException("invalid offset: " + inOfs);
 216         }
 217         if (inLen > in.length - inOfs) {
 218             throw new RuntimeException("input length out of bound: " +
 219                                        inLen + " > " + (in.length - inOfs));
 220         }
 221         if (inLen % AES_BLOCK_SIZE != 0) {
 222             throw new RuntimeException("input length/block size mismatch: " +
 223                                        inLen);
 224         }
 225 
 226         // These two checks are for C2 checking
 227         if (st.length != 2) {
 228             throw new RuntimeException("internal state has invalid length: " +
 229                                        st.length);
 230         }
 231         if (subkeyHtbl.length != 18) {
 232             throw new RuntimeException("internal subkeyH has invalid length: " +
 233                                        subkeyHtbl.length);
 234         }
 235     }
 236     /*
 237      * This is an intrinsified method.  The method's argument list must match
 238      * the hotspot signature.  This method and methods called by it, cannot
 239      * throw exceptions or allocate arrays as it will breaking intrinsics
 240      */
 241     @HotSpotIntrinsicCandidate
 242     private static void processBlocks(byte[] data, int inOfs, int blocks, long[] st, long[] subH) {
 243         int offset = inOfs;
 244         while (blocks > 0) {
 245             processBlock(data, offset, st, subH);
 246             blocks--;
 247             offset += AES_BLOCK_SIZE;
 248         }
 249     }
 250 
 251     byte[] digest() {
 252         byte[] result = new byte[AES_BLOCK_SIZE];
 253         putLong(result, 0, state[0]);
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