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Merge pull request #13 from IonicDev/release/2.9
2.9 release
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src/main/java/com/ionic/sdk/agent/cipher/binary/BinaryCipherAbstract.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| package com.ionic.sdk.agent.cipher.binary; | ||
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| import com.ionic.sdk.agent.cipher.data.DecryptAttributes; | ||
| import com.ionic.sdk.agent.cipher.data.EncryptAttributes; | ||
| import com.ionic.sdk.agent.request.createkey.CreateKeysResponse; | ||
| import com.ionic.sdk.agent.request.getkey.GetKeysResponse; | ||
| import com.ionic.sdk.core.codec.Transcoder; | ||
| import com.ionic.sdk.core.io.BytePattern; | ||
| import com.ionic.sdk.error.IonicException; | ||
| import com.ionic.sdk.error.SdkData; | ||
| import com.ionic.sdk.error.SdkError; | ||
| import com.ionic.sdk.key.KeyServices; | ||
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|
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| import java.nio.ByteBuffer; | ||
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| /** | ||
| * Cipher implementation specialized for dealing with binary data. As with | ||
| * {@link com.ionic.sdk.agent.cipher.chunk.ChunkCipherAbstract} implementations, the Machina key tag is incorporated | ||
| * into the output ciphertext. This makes the plaintext recoverable, given only the ciphertext as input. | ||
| */ | ||
| public abstract class BinaryCipherAbstract { | ||
|
|
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| /** | ||
| * Key services implementation; used to broker key transactions and crypto operations. | ||
| */ | ||
| private final KeyServices keyServices; | ||
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| /** | ||
| * Constructor. | ||
| * | ||
| * @param keyServices the key services implementation | ||
| */ | ||
| public BinaryCipherAbstract(final KeyServices keyServices) { | ||
| this.keyServices = keyServices; | ||
| } | ||
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| /** | ||
| * @return the key services implementation; used to broker key transactions and crypto operations | ||
| */ | ||
| public final KeyServices getKeyServices() { | ||
| return keyServices; | ||
| } | ||
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| /** | ||
| * Encrypt the input plaintext using the provided {@link EncryptAttributes}. | ||
| * | ||
| * @param plainText the plaintext to be encrypted | ||
| * @param encryptAttributes (in/out) the parameters to be used for the encryption; the encryption result parameters | ||
| * @return the encoded ciphertext for the given input | ||
| * @throws IonicException on cryptography failures | ||
| */ | ||
| public final byte[] encrypt(final byte[] plainText, final EncryptAttributes encryptAttributes) | ||
| throws IonicException { | ||
| // check input | ||
| SdkData.checkNotNull(keyServices, KeyServices.class.getName()); | ||
| SdkData.checkNotNull(plainText, byte[].class.getName()); | ||
| SdkData.checkNotNull(encryptAttributes, EncryptAttributes.class.getName()); | ||
| // obtain Machina key | ||
| final CreateKeysResponse createKeysResponse = keyServices.createKey(encryptAttributes.getKeyAttributes(), | ||
| encryptAttributes.getKeyAttributes(), encryptAttributes.getMetadata()); | ||
| final CreateKeysResponse.Key createKey = createKeysResponse.getFirstKey(); // one key expected | ||
| encryptAttributes.setKeyResponse(createKey); | ||
| final ByteBuffer plainBuffer = ByteBuffer.wrap(plainText); | ||
| // perform implementation-specific encryption | ||
| return encryptInternal(plainBuffer, encryptAttributes); | ||
| } | ||
|
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| /** | ||
| * Implementation-specific algorithm for encryption of input plaintext. | ||
| * | ||
| * @param plainBuffer the plaintext to be encrypted | ||
| * @param encryptAttributes (in/out) the parameters to be used for the encryption; the encryption result parameters | ||
| * @return the encoded ciphertext for the given input | ||
| * @throws IonicException on cryptography failures | ||
| */ | ||
| abstract byte[] encryptInternal(ByteBuffer plainBuffer, EncryptAttributes encryptAttributes) throws IonicException; | ||
|
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| /** | ||
| * Decrypt the input ciphertext. | ||
| * | ||
| * @param cipherText the ciphertext to be decrypted | ||
| * @param decryptAttributes (in/out) the parameters to be used in the decryption; the decryption result parameters | ||
| * @return the original plaintext associated with the given ciphertext input | ||
| * @throws IonicException on cryptography failures | ||
| */ | ||
| public final byte[] decrypt(final byte[] cipherText, final DecryptAttributes decryptAttributes) | ||
| throws IonicException { | ||
| final byte[] delimiterExpected = Transcoder.utf8().decode(DELIMITER); | ||
| // check input | ||
| SdkData.checkNotNull(keyServices, KeyServices.class.getName()); | ||
| SdkData.checkNotNull(cipherText, byte[].class.getName()); | ||
| SdkData.checkNotNull(decryptAttributes, DecryptAttributes.class.getName()); | ||
| // setup for cryptography (allocate space) | ||
| final ByteBuffer cipherBuffer = ByteBuffer.wrap(cipherText); | ||
| final int offsetDelimiter = BytePattern.findIn(cipherText, 0, delimiterExpected); | ||
| final byte[] keyTagBytes = new byte[offsetDelimiter]; | ||
| cipherBuffer.get(keyTagBytes); | ||
| final String keyTag = Transcoder.utf8().encode(keyTagBytes); | ||
| final byte delimiter = cipherBuffer.get(); | ||
| SdkData.checkTrue(delimiter == delimiterExpected[0], SdkError.ISAGENT_INVALIDVALUE); | ||
| // obtain Machina key | ||
| final GetKeysResponse getKeysResponse = keyServices.getKey(keyTag, decryptAttributes.getMetadata()); | ||
| final GetKeysResponse.Key key = getKeysResponse.getFirstKey(); | ||
| decryptAttributes.setKeyResponse(key); | ||
| SdkData.checkTrue(key.getId().equals(keyTag), SdkError.ISAGENT_BADRESPONSE); | ||
| // perform implementation-specific decryption | ||
| return decryptInternal(cipherBuffer, decryptAttributes); | ||
| } | ||
|
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| /** | ||
| * Implementation-specific algorithm for decryption of input ciphertext. | ||
| * | ||
| * @param cipherBuffer the ciphertext to be decrypted | ||
| * @param decryptAttributes (in/out) the parameters to be used in the decryption; the decryption result parameters | ||
| * @return the original plaintext associated with the given ciphertext input | ||
| * @throws IonicException on cryptography failures | ||
| */ | ||
| abstract byte[] decryptInternal(ByteBuffer cipherBuffer, DecryptAttributes decryptAttributes) throws IonicException; | ||
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| /** | ||
| * The defined delimiter for this cipher type. | ||
| */ | ||
| public static final String DELIMITER = "~"; | ||
| } |
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