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Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/modes/PGPCFBBlockCipher.java')
-rw-r--r--core/src/main/java/org/bouncycastle/crypto/modes/PGPCFBBlockCipher.java455
1 files changed, 0 insertions, 455 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/modes/PGPCFBBlockCipher.java b/core/src/main/java/org/bouncycastle/crypto/modes/PGPCFBBlockCipher.java
deleted file mode 100644
index 4dee63a5..00000000
--- a/core/src/main/java/org/bouncycastle/crypto/modes/PGPCFBBlockCipher.java
+++ /dev/null
@@ -1,455 +0,0 @@
-package org.bouncycastle.crypto.modes;
-
-import org.bouncycastle.crypto.BlockCipher;
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.params.ParametersWithIV;
-
-/**
- * Implements OpenPGP's rather strange version of Cipher-FeedBack (CFB) mode on top of a simple cipher. For further info see <a href="http://www.ietf.org/rfc/rfc2440.html">RFC 2440</a>.
- */
-public class PGPCFBBlockCipher
- implements BlockCipher
-{
- private byte[] IV;
- private byte[] FR;
- private byte[] FRE;
- private byte[] tmp;
-
- private BlockCipher cipher;
-
- private int count;
- private int blockSize;
- private boolean forEncryption;
-
- private boolean inlineIv; // if false we don't need to prepend an IV
-
- /**
- * Basic constructor.
- *
- * @param cipher the block cipher to be used as the basis of the
- * feedback mode.
- * @param inlineIv if true this is for PGP CFB with a prepended iv.
- */
- public PGPCFBBlockCipher(
- BlockCipher cipher,
- boolean inlineIv)
- {
- this.cipher = cipher;
- this.inlineIv = inlineIv;
-
- this.blockSize = cipher.getBlockSize();
- this.IV = new byte[blockSize];
- this.FR = new byte[blockSize];
- this.FRE = new byte[blockSize];
- this.tmp = new byte[blockSize];
- }
-
- /**
- * return the underlying block cipher that we are wrapping.
- *
- * @return the underlying block cipher that we are wrapping.
- */
- public BlockCipher getUnderlyingCipher()
- {
- return cipher;
- }
-
- /**
- * return the algorithm name and mode.
- *
- * @return the name of the underlying algorithm followed by "/PGPCFB"
- * and the block size in bits.
- */
- public String getAlgorithmName()
- {
- if (inlineIv)
- {
- return cipher.getAlgorithmName() + "/PGPCFBwithIV";
- }
- else
- {
- return cipher.getAlgorithmName() + "/PGPCFB";
- }
- }
-
- /**
- * return the block size we are operating at.
- *
- * @return the block size we are operating at (in bytes).
- */
- public int getBlockSize()
- {
- return cipher.getBlockSize();
- }
-
- /**
- * Process one block of input from the array in and write it to
- * the out array.
- *
- * @param in the array containing the input data.
- * @param inOff offset into the in array the data starts at.
- * @param out the array the output data will be copied into.
- * @param outOff the offset into the out array the output will start at.
- * @exception DataLengthException if there isn't enough data in in, or
- * space in out.
- * @exception IllegalStateException if the cipher isn't initialised.
- * @return the number of bytes processed and produced.
- */
- public int processBlock(
- byte[] in,
- int inOff,
- byte[] out,
- int outOff)
- throws DataLengthException, IllegalStateException
- {
- if (inlineIv)
- {
- return (forEncryption) ? encryptBlockWithIV(in, inOff, out, outOff) : decryptBlockWithIV(in, inOff, out, outOff);
- }
- else
- {
- return (forEncryption) ? encryptBlock(in, inOff, out, outOff) : decryptBlock(in, inOff, out, outOff);
- }
- }
-
- /**
- * reset the chaining vector back to the IV and reset the underlying
- * cipher.
- */
- public void reset()
- {
- count = 0;
-
- for (int i = 0; i != FR.length; i++)
- {
- if (inlineIv)
- {
- FR[i] = 0;
- }
- else
- {
- FR[i] = IV[i]; // if simple mode, key is IV (even if this is zero)
- }
- }
-
- cipher.reset();
- }
-
- /**
- * Initialise the cipher and, possibly, the initialisation vector (IV).
- * If an IV isn't passed as part of the parameter, the IV will be all zeros.
- * An IV which is too short is handled in FIPS compliant fashion.
- *
- * @param forEncryption if true the cipher is initialised for
- * encryption, if false for decryption.
- * @param params the key and other data required by the cipher.
- * @exception IllegalArgumentException if the params argument is
- * inappropriate.
- */
- public void init(
- boolean forEncryption,
- CipherParameters params)
- throws IllegalArgumentException
- {
- this.forEncryption = forEncryption;
-
- if (params instanceof ParametersWithIV)
- {
- ParametersWithIV ivParam = (ParametersWithIV)params;
- byte[] iv = ivParam.getIV();
-
- if (iv.length < IV.length)
- {
- // prepend the supplied IV with zeros (per FIPS PUB 81)
- System.arraycopy(iv, 0, IV, IV.length - iv.length, iv.length);
- for (int i = 0; i < IV.length - iv.length; i++)
- {
- IV[i] = 0;
- }
- }
- else
- {
- System.arraycopy(iv, 0, IV, 0, IV.length);
- }
-
- reset();
-
- cipher.init(true, ivParam.getParameters());
- }
- else
- {
- reset();
-
- cipher.init(true, params);
- }
- }
-
- /**
- * Encrypt one byte of data according to CFB mode.
- * @param data the byte to encrypt
- * @param blockOff where am i in the current block, determines when to resync the block
- * @returns the encrypted byte
- */
- private byte encryptByte(byte data, int blockOff)
- {
- return (byte)(FRE[blockOff] ^ data);
- }
-
- /**
- * Do the appropriate processing for CFB IV mode encryption.
- *
- * @param in the array containing the data to be encrypted.
- * @param inOff offset into the in array the data starts at.
- * @param out the array the encrypted data will be copied into.
- * @param outOff the offset into the out array the output will start at.
- * @exception DataLengthException if there isn't enough data in in, or
- * space in out.
- * @exception IllegalStateException if the cipher isn't initialised.
- * @return the number of bytes processed and produced.
- */
- private int encryptBlockWithIV(
- byte[] in,
- int inOff,
- byte[] out,
- int outOff)
- throws DataLengthException, IllegalStateException
- {
- if ((inOff + blockSize) > in.length)
- {
- throw new DataLengthException("input buffer too short");
- }
-
- if (count == 0)
- {
- if ((outOff + 2 * blockSize + 2) > out.length)
- {
- throw new DataLengthException("output buffer too short");
- }
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- for (int n = 0; n < blockSize; n++)
- {
- out[outOff + n] = encryptByte(IV[n], n);
- }
-
- System.arraycopy(out, outOff, FR, 0, blockSize);
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- out[outOff + blockSize] = encryptByte(IV[blockSize - 2], 0);
- out[outOff + blockSize + 1] = encryptByte(IV[blockSize - 1], 1);
-
- System.arraycopy(out, outOff + 2, FR, 0, blockSize);
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- for (int n = 0; n < blockSize; n++)
- {
- out[outOff + blockSize + 2 + n] = encryptByte(in[inOff + n], n);
- }
-
- System.arraycopy(out, outOff + blockSize + 2, FR, 0, blockSize);
-
- count += 2 * blockSize + 2;
-
- return 2 * blockSize + 2;
- }
- else if (count >= blockSize + 2)
- {
- if ((outOff + blockSize) > out.length)
- {
- throw new DataLengthException("output buffer too short");
- }
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- for (int n = 0; n < blockSize; n++)
- {
- out[outOff + n] = encryptByte(in[inOff + n], n);
- }
-
- System.arraycopy(out, outOff, FR, 0, blockSize);
- }
-
- return blockSize;
- }
-
- /**
- * Do the appropriate processing for CFB IV mode decryption.
- *
- * @param in the array containing the data to be decrypted.
- * @param inOff offset into the in array the data starts at.
- * @param out the array the encrypted data will be copied into.
- * @param outOff the offset into the out array the output will start at.
- * @exception DataLengthException if there isn't enough data in in, or
- * space in out.
- * @exception IllegalStateException if the cipher isn't initialised.
- * @return the number of bytes processed and produced.
- */
- private int decryptBlockWithIV(
- byte[] in,
- int inOff,
- byte[] out,
- int outOff)
- throws DataLengthException, IllegalStateException
- {
- if ((inOff + blockSize) > in.length)
- {
- throw new DataLengthException("input buffer too short");
- }
-
- if ((outOff + blockSize) > out.length)
- {
- throw new DataLengthException("output buffer too short");
- }
-
- if (count == 0)
- {
- for (int n = 0; n < blockSize; n++)
- {
- FR[n] = in[inOff + n];
- }
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- count += blockSize;
-
- return 0;
- }
- else if (count == blockSize)
- {
- // copy in buffer so that this mode works if in and out are the same
- System.arraycopy(in, inOff, tmp, 0, blockSize);
-
- System.arraycopy(FR, 2, FR, 0, blockSize - 2);
-
- FR[blockSize - 2] = tmp[0];
- FR[blockSize - 1] = tmp[1];
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- for (int n = 0; n < blockSize - 2; n++)
- {
- out[outOff + n] = encryptByte(tmp[n + 2], n);
- }
-
- System.arraycopy(tmp, 2, FR, 0, blockSize - 2);
-
- count += 2;
-
- return blockSize - 2;
- }
- else if (count >= blockSize + 2)
- {
- // copy in buffer so that this mode works if in and out are the same
- System.arraycopy(in, inOff, tmp, 0, blockSize);
-
- out[outOff + 0] = encryptByte(tmp[0], blockSize - 2);
- out[outOff + 1] = encryptByte(tmp[1], blockSize - 1);
-
- System.arraycopy(tmp, 0, FR, blockSize - 2, 2);
-
- cipher.processBlock(FR, 0, FRE, 0);
-
- for (int n = 0; n < blockSize - 2; n++)
- {
- out[outOff + n + 2] = encryptByte(tmp[n + 2], n);
- }
-
- System.arraycopy(tmp, 2, FR, 0, blockSize - 2);
-
- }
-
- return blockSize;
- }
-
- /**
- * Do the appropriate processing for CFB mode encryption.
- *
- * @param in the array containing the data to be encrypted.
- * @param inOff offset into the in array the data starts at.
- * @param out the array the encrypted data will be copied into.
- * @param outOff the offset into the out array the output will start at.
- * @exception DataLengthException if there isn't enough data in in, or
- * space in out.
- * @exception IllegalStateException if the cipher isn't initialised.
- * @return the number of bytes processed and produced.
- */
- private int encryptBlock(
- byte[] in,
- int inOff,
- byte[] out,
- int outOff)
- throws DataLengthException, IllegalStateException
- {
- if ((inOff + blockSize) > in.length)
- {
- throw new DataLengthException("input buffer too short");
- }
-
- if ((outOff + blockSize) > out.length)
- {
- throw new DataLengthException("output buffer too short");
- }
-
- cipher.processBlock(FR, 0, FRE, 0);
- for (int n = 0; n < blockSize; n++)
- {
- out[outOff + n] = encryptByte(in[inOff + n], n);
- }
-
- for (int n = 0; n < blockSize; n++)
- {
- FR[n] = out[outOff + n];
- }
-
- return blockSize;
-
- }
-
- /**
- * Do the appropriate processing for CFB mode decryption.
- *
- * @param in the array containing the data to be decrypted.
- * @param inOff offset into the in array the data starts at.
- * @param out the array the encrypted data will be copied into.
- * @param outOff the offset into the out array the output will start at.
- * @exception DataLengthException if there isn't enough data in in, or
- * space in out.
- * @exception IllegalStateException if the cipher isn't initialised.
- * @return the number of bytes processed and produced.
- */
- private int decryptBlock(
- byte[] in,
- int inOff,
- byte[] out,
- int outOff)
- throws DataLengthException, IllegalStateException
- {
- if ((inOff + blockSize) > in.length)
- {
- throw new DataLengthException("input buffer too short");
- }
-
- if ((outOff + blockSize) > out.length)
- {
- throw new DataLengthException("output buffer too short");
- }
-
- cipher.processBlock(FR, 0, FRE, 0);
- for (int n = 0; n < blockSize; n++)
- {
- out[outOff + n] = encryptByte(in[inOff + n], n);
- }
-
- for (int n = 0; n < blockSize; n++)
- {
- FR[n] = in[inOff + n];
- }
-
- return blockSize;
-
- }
-}
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