diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/pqc/crypto/mceliece/McEliecePointchevalDigestCipher.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/pqc/crypto/mceliece/McEliecePointchevalDigestCipher.java | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/pqc/crypto/mceliece/McEliecePointchevalDigestCipher.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/pqc/crypto/mceliece/McEliecePointchevalDigestCipher.java new file mode 100644 index 000000000..bcfd1d875 --- /dev/null +++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/pqc/crypto/mceliece/McEliecePointchevalDigestCipher.java @@ -0,0 +1,128 @@ +package org.spongycastle.pqc.crypto.mceliece; + + +import org.spongycastle.crypto.CipherParameters; +import org.spongycastle.crypto.Digest; +import org.spongycastle.crypto.params.AsymmetricKeyParameter; +import org.spongycastle.crypto.params.ParametersWithRandom; +import org.spongycastle.pqc.crypto.MessageEncryptor; + +// TODO should implement some interface? +public class McEliecePointchevalDigestCipher +{ + + private final Digest messDigest; + + private final MessageEncryptor mcElieceCCA2Cipher; + + private boolean forEncrypting; + + + public McEliecePointchevalDigestCipher(MessageEncryptor mcElieceCCA2Cipher, Digest messDigest) + { + this.mcElieceCCA2Cipher = mcElieceCCA2Cipher; + this.messDigest = messDigest; + } + + + public void init(boolean forEncrypting, + CipherParameters param) + { + + this.forEncrypting = forEncrypting; + AsymmetricKeyParameter k; + + if (param instanceof ParametersWithRandom) + { + k = (AsymmetricKeyParameter)((ParametersWithRandom)param).getParameters(); + } + else + { + k = (AsymmetricKeyParameter)param; + } + + if (forEncrypting && k.isPrivate()) + { + throw new IllegalArgumentException("Encrypting Requires Public Key."); + } + + if (!forEncrypting && !k.isPrivate()) + { + throw new IllegalArgumentException("Decrypting Requires Private Key."); + } + + reset(); + + mcElieceCCA2Cipher.init(forEncrypting, param); + } + + + public byte[] messageEncrypt() + { + if (!forEncrypting) + { + throw new IllegalStateException("McEliecePointchevalDigestCipher not initialised for encrypting."); + } + + byte[] hash = new byte[messDigest.getDigestSize()]; + messDigest.doFinal(hash, 0); + byte[] enc = null; + + try + { + enc = mcElieceCCA2Cipher.messageEncrypt(hash); + } + catch (Exception e) + { + e.printStackTrace(); + } + + + return enc; + } + + + public byte[] messageDecrypt(byte[] ciphertext) + { + byte[] output = null; + if (forEncrypting) + { + throw new IllegalStateException("McEliecePointchevalDigestCipher not initialised for decrypting."); + } + + + try + { + output = mcElieceCCA2Cipher.messageDecrypt(ciphertext); + } + catch (Exception e) + { + e.printStackTrace(); + } + + + return output; + } + + + public void update(byte b) + { + messDigest.update(b); + + } + + public void update(byte[] in, int off, int len) + { + messDigest.update(in, off, len); + + } + + + public void reset() + { + messDigest.reset(); + + } + + +} |