Class AltsChannelCrypter

java.lang.Object
io.grpc.alts.internal.AltsChannelCrypter
All Implemented Interfaces:
ChannelCrypterNetty
final class AltsChannelCrypter extends Object implements ChannelCrypterNetty
Performs encryption and decryption with AES-GCM using JCE. All methods are thread-compatible.

  • Field Details

    • KEY_LENGTH

      private static final int KEY_LENGTH

    • COUNTER_LENGTH

      private static final int COUNTER_LENGTH
      See Also:

    • COUNTER_OVERFLOW_LENGTH

      private static final int COUNTER_OVERFLOW_LENGTH
      See Also:

    • TAG_LENGTH

      private static final int TAG_LENGTH
      See Also:

    • aeadCrypter

      private final AeadCrypter aeadCrypter

    • outCounter

      private final byte[] outCounter

    • inCounter

      private final byte[] inCounter

    • oldCounter

      private final byte[] oldCounter

  • Constructor Details

    • AltsChannelCrypter

      AltsChannelCrypter(byte[] key, boolean isClient)

  • Method Details

    • getKeyLength

      static int getKeyLength()

    • getCounterLength

      static int getCounterLength()

    • encrypt

      public void encrypt(io.netty.buffer.ByteBuf outBuf, List<io.netty.buffer.ByteBuf> plainBufs) throws GeneralSecurityException
      Description copied from interface: ChannelCrypterNetty
      Encrypt plaintext into output buffer.
      Specified by:
      encrypt in interface ChannelCrypterNetty
      Parameters:
      outBuf - the protected input will be written into this buffer. The buffer must be direct and have enough space to hold all input buffers and the tag. Encrypt does not take ownership of this buffer.
      plainBufs - the input buffers that should be protected. Encrypt does not modify or take ownership of these buffers.
      Throws:
      GeneralSecurityException

    • decrypt

      public void decrypt(io.netty.buffer.ByteBuf out, io.netty.buffer.ByteBuf tag, List<io.netty.buffer.ByteBuf> ciphertextBufs) throws GeneralSecurityException
      Description copied from interface: ChannelCrypterNetty
      Decrypt ciphertext into the given output buffer and check tag.
      Specified by:
      decrypt in interface ChannelCrypterNetty
      Parameters:
      out - the unprotected input will be written into this buffer. The buffer must be direct and have enough space to hold all ciphertext buffers and the tag, i.e., it must have additional space for the tag, even though this space will be unused in the final result. Decrypt does not take ownership of this buffer.
      tag - the tag appended to the ciphertext. Decrypt does not modify or take ownership of this buffer.
      ciphertextBufs - the buffers that should be unprotected (excluding the tag). Decrypt does not modify or take ownership of these buffers.
      Throws:
      GeneralSecurityException

    • decrypt

      public void decrypt(io.netty.buffer.ByteBuf out, io.netty.buffer.ByteBuf ciphertextAndTag) throws GeneralSecurityException
      Description copied from interface: ChannelCrypterNetty
      Decrypt ciphertext into the given output buffer and check tag.
      Specified by:
      decrypt in interface ChannelCrypterNetty
      Parameters:
      out - the unprotected input will be written into this buffer. The buffer must be direct and have enough space to hold all ciphertext buffers and the tag, i.e., it must have additional space for the tag, even though this space will be unused in the final result. Decrypt does not take ownership of this buffer.
      ciphertextAndTag - single buffer containing ciphertext and tag that should be unprotected. The buffer must be direct and either completely overlap with out or not overlap at all.
      Throws:
      GeneralSecurityException

    • getSuffixLength

      public int getSuffixLength()
      Description copied from interface: ChannelCrypterNetty
      Returns the length of the tag in bytes.
      Specified by:
      getSuffixLength in interface ChannelCrypterNetty

    • destroy

      public void destroy()
      Description copied from interface: ChannelCrypterNetty
      Must be called to release all associated resources (instance cannot be used afterwards).
      Specified by:
      destroy in interface ChannelCrypterNetty

    • incrementCounter

      static void incrementCounter(byte[] counter, byte[] oldCounter) throws GeneralSecurityException
      Increments counter, store the unincremented value in oldCounter.
      Throws:
      GeneralSecurityException

    • incrementInCounter

      private byte[] incrementInCounter() throws GeneralSecurityException
      Increments the input counter, returning the previous (unincremented) value.
      Throws:
      GeneralSecurityException

    • incrementOutCounter

      private byte[] incrementOutCounter() throws GeneralSecurityException
      Increments the output counter, returning the previous (unincremented) value.
      Throws:
      GeneralSecurityException

    • incrementInCounterForTesting

      void incrementInCounterForTesting(int n) throws GeneralSecurityException
      Throws:
      GeneralSecurityException

    • incrementOutCounterForTesting

      void incrementOutCounterForTesting(int n) throws GeneralSecurityException
      Throws:
      GeneralSecurityException