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37 changes: 25 additions & 12 deletions java/src/main/java/com/google/rcat/RcatTinkCrypto.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ public final class RcatTinkCrypto {
/** A {@code Signer} that performs public key signing operation with Tink. */
public static class Signer implements RcatCrypto.Signer {

private final KeysetHandle privateKeysetHandle;
private final PublicKeySign signer;

/**
* Computes the signature for {@code data}.
Expand All @@ -46,7 +46,6 @@ public static class Signer implements RcatCrypto.Signer {
@Override
public byte[] sign(byte[] data) throws RcatSigningException {
try {
PublicKeySign signer = this.privateKeysetHandle.getPrimitive(PublicKeySign.class);
return signer.sign(data);
} catch (GeneralSecurityException e) {
throw new RcatSigningException("Unable to create signature for payload bytes.", e);
Expand All @@ -64,14 +63,18 @@ public static RcatTinkCrypto.Signer withPrivateKeysetHandle(KeysetHandle private
}

private Signer(KeysetHandle privateKeysetHandle) {
this.privateKeysetHandle = privateKeysetHandle;
try {
this.signer = privateKeysetHandle.getPrimitive(PublicKeySign.class);
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Unable to create signer", e);
}
}
}

/** A {@code Verifier} that performs public key signing verification operation with Tink. */
public static class Verifier implements RcatCrypto.Verifier {

private final KeysetHandle publicKeysetHandle;
private final PublicKeyVerify verifier;

/**
* Verifies whether {@code signature} is a valid signature for {@code data}.
Expand All @@ -82,7 +85,6 @@ public static class Verifier implements RcatCrypto.Verifier {
@Override
public void verify(byte[] signature, byte[] data) throws RcatSignatureValidationException {
try {
PublicKeyVerify verifier = this.publicKeysetHandle.getPrimitive(PublicKeyVerify.class);
verifier.verify(signature, data);
} catch (GeneralSecurityException e) {
throw new RcatSignatureValidationException(
Expand All @@ -102,14 +104,19 @@ public static RcatTinkCrypto.Verifier withPublicKeysetHandle(KeysetHandle public
}

private Verifier(KeysetHandle publicKeysetHandle) {
this.publicKeysetHandle = publicKeysetHandle;
try {
this.verifier = publicKeysetHandle.getPrimitive(PublicKeyVerify.class);
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Unable to create verifier", e);
}
;
}
}

/** An {@code Encrypter} that performs encryption operation with Tink. */
public static class Encrypter implements RcatCrypto.Encrypter {

private final KeysetHandle publicKeysetHandle;
private final HybridEncrypt encrypter;

/**
* Encrypts {@code plaintext} binding {@code contextInfo} to the resulting ciphertext.
Expand All @@ -120,7 +127,6 @@ public static class Encrypter implements RcatCrypto.Encrypter {
@Override
public byte[] encrypt(byte[] plaintext, byte[] contextInfo) throws RcatEncryptionException {
try {
HybridEncrypt encrypter = this.publicKeysetHandle.getPrimitive(HybridEncrypt.class);
return encrypter.encrypt(plaintext, contextInfo);
} catch (GeneralSecurityException e) {
throw new RcatEncryptionException("Unable to encrypt RCAT token envelope.", e);
Expand All @@ -138,14 +144,18 @@ public static RcatTinkCrypto.Encrypter withPublicKeysetHandle(KeysetHandle publi
}

private Encrypter(KeysetHandle publicKeysetHandle) {
this.publicKeysetHandle = publicKeysetHandle;
try {
this.encrypter = publicKeysetHandle.getPrimitive(HybridEncrypt.class);
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Unable to create encrypter", e);
}
}
}

/** An {@code Decrypter} that performs decryption operation with Tink. */
public static class Decrypter implements RcatCrypto.Decrypter {

private final KeysetHandle privateKeysetHandle;
private final HybridDecrypt decrypter;

/**
* Decrypts {@code ciphertext} verifying the integrity of {@code contextInfo}.
Expand All @@ -156,7 +166,6 @@ public static class Decrypter implements RcatCrypto.Decrypter {
@Override
public byte[] decrypt(byte[] ciphertext, byte[] contextInfo) throws RcatDecryptionException {
try {
HybridDecrypt decrypter = this.privateKeysetHandle.getPrimitive(HybridDecrypt.class);
return decrypter.decrypt(ciphertext, contextInfo);
} catch (GeneralSecurityException e) {
throw new RcatDecryptionException("Unable to decrypt RCAT token envelope.", e);
Expand All @@ -175,7 +184,11 @@ public static RcatTinkCrypto.Decrypter withPrivateKeysetHandle(
}

private Decrypter(KeysetHandle privateKeysetHandle) {
this.privateKeysetHandle = privateKeysetHandle;
try {
this.decrypter = privateKeysetHandle.getPrimitive(HybridDecrypt.class);
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Unable to create decrypter", e);
}
}
}

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