1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpackage org.bouncycastle.crypto.modes; 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.bouncycastle.crypto.BlockCipher; 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.bouncycastle.crypto.BufferedBlockCipher; 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.bouncycastle.crypto.DataLengthException; 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.bouncycastle.crypto.InvalidCipherTextException; 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/** 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * A wrapper class that allows block ciphers to be used to process data in 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * a piecemeal fashion with PKCS5/PKCS7 padding. The PaddedBlockCipher 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * outputs a block only when the buffer is full and more data is being added, 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * or on a doFinal (unless the current block in the buffer is a pad block). 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * The padding mechanism used is the one outlined in PKCS5/PKCS7. 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @deprecated use org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher instead. 16f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpublic class PaddedBlockCipher 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project extends BufferedBlockCipher 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project{ 20f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 21f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Create a buffered block cipher with, or without, padding. 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 23f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param cipher the underlying block cipher this buffering object wraps. 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public PaddedBlockCipher( 26f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project BlockCipher cipher) 27f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 28f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.cipher = cipher; 29f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 30f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project buf = new byte[cipher.getBlockSize()]; 31f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff = 0; 32f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 33f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 34f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 35f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * return the size of the output buffer required for an update plus a 36f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * doFinal with an input of len bytes. 37f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 38f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param len the length of the input. 39f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return the space required to accommodate a call to update and doFinal 40f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * with len bytes of input. 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int getOutputSize( 43f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int len) 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 45f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int total = len + bufOff; 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int leftOver = total % buf.length; 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (leftOver == 0) 49f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 50f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (forEncryption) 51f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 52f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return total + buf.length; 53f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 54f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return total; 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 57f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 58f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return total - leftOver + buf.length; 59f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 60f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 61f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 62f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * return the size of the output buffer required for an update 63f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * an input of len bytes. 64f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 65f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param len the length of the input. 66f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return the space required to accommodate a call to update 67f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * with len bytes of input. 68f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int getUpdateOutputSize( 70f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int len) 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int total = len + bufOff; 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int leftOver = total % buf.length; 74f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 75f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (leftOver == 0) 76f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 77f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return total - buf.length; 78f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 79f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 80f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return total - leftOver; 81f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 82f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 83f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 84f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * process a single byte, producing an output block if neccessary. 85f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 86f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param in the input byte. 87f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param out the space for any output that might be produced. 88f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param outOff the offset from which the output will be copied. 89f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception DataLengthException if there isn't enough space in out. 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception IllegalStateException if the cipher isn't initialised. 91f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 92f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int processByte( 93f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte in, 94f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] out, 95f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int outOff) 96f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throws DataLengthException, IllegalStateException 97f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 98f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int resultLen = 0; 99f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 100f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (bufOff == buf.length) 101f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 102f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen = cipher.processBlock(buf, 0, out, outOff); 103f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff = 0; 104f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 105f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 106f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project buf[bufOff++] = in; 107f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 108f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return resultLen; 109f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 110f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 111f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 112f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * process an array of bytes, producing output if necessary. 113f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 114f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param in the input byte array. 115f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param inOff the offset at which the input data starts. 116f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param len the number of bytes to be copied out of the input array. 117f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param out the space for any output that might be produced. 118f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param outOff the offset from which the output will be copied. 119f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception DataLengthException if there isn't enough space in out. 120f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception IllegalStateException if the cipher isn't initialised. 121f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 122f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int processBytes( 123f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] in, 124f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int inOff, 125f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int len, 126f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] out, 127f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int outOff) 128f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throws DataLengthException, IllegalStateException 129f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 130f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (len < 0) 131f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 132f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new IllegalArgumentException("Can't have a negative input length!"); 133f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 134f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 135f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int blockSize = getBlockSize(); 136f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int length = getUpdateOutputSize(len); 137f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 138f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (length > 0) 139f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 140f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if ((outOff + length) > out.length) 141f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 142f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new DataLengthException("output buffer too short"); 143f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 144f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 145f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 146f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int resultLen = 0; 147f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int gapLen = buf.length - bufOff; 148f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 149f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (len > gapLen) 150f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 151f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project System.arraycopy(in, inOff, buf, bufOff, gapLen); 152f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 153f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen += cipher.processBlock(buf, 0, out, outOff); 154f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 155f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff = 0; 156f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project len -= gapLen; 157f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project inOff += gapLen; 158f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 159f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (len > buf.length) 160f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 161f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen += cipher.processBlock(in, inOff, out, outOff + resultLen); 162f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 163f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project len -= blockSize; 164f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project inOff += blockSize; 165f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 166f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 167f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 168f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project System.arraycopy(in, inOff, buf, bufOff, len); 169f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 170f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff += len; 171f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 172f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return resultLen; 173f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 174f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 175f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 176f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Process the last block in the buffer. If the buffer is currently 177f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * full and padding needs to be added a call to doFinal will produce 178f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 2 * getBlockSize() bytes. 179f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 180f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param out the array the block currently being held is copied into. 181f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param outOff the offset at which the copying starts. 182f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception DataLengthException if there is insufficient space in out for 183f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * the output or we are decrypting and the input is not block size aligned. 184f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception IllegalStateException if the underlying cipher is not 185f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * initialised. 186f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @exception InvalidCipherTextException if padding is expected and not found. 187f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 188f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int doFinal( 189f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] out, 190f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int outOff) 191f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throws DataLengthException, IllegalStateException, InvalidCipherTextException 192f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 193f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int blockSize = cipher.getBlockSize(); 194f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int resultLen = 0; 195f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 196f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (forEncryption) 197f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 198f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (bufOff == blockSize) 199f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 200f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if ((outOff + 2 * blockSize) > out.length) 201f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 202f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new DataLengthException("output buffer too short"); 203f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 204f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 205f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen = cipher.processBlock(buf, 0, out, outOff); 206f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff = 0; 207f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 208f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 209f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 210f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // add PKCS7 padding 211f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 212f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte code = (byte)(blockSize - bufOff); 213f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 214f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (bufOff < blockSize) 215f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 216f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project buf[bufOff] = code; 217f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff++; 218f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 219f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 220f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen += cipher.processBlock(buf, 0, out, outOff + resultLen); 221f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 222f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project else 223f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 224f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (bufOff == blockSize) 225f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 226f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen = cipher.processBlock(buf, 0, buf, 0); 227f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project bufOff = 0; 228f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 229f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project else 230f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 231f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new DataLengthException("last block incomplete in decryption"); 232f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 233f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 234f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 235f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // remove PKCS7 padding 236f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 237f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int count = buf[blockSize - 1] & 0xff; 238f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 239f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if ((count < 0) || (count > blockSize)) 240f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 241f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new InvalidCipherTextException("pad block corrupted"); 242f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 243f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 244f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project resultLen -= count; 245f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 246f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project System.arraycopy(buf, 0, out, outOff, resultLen); 247f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 248f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 249f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project reset(); 250f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 251f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return resultLen; 252f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 253f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 254