Add pgp encryption and decryption

ballerina/build.gradle

@@ -76,6 +76,9 @@ dependencies {
     externalJars(group: 'org.bouncycastle', name: 'bcutil-jdk18on', version: "${bouncycastleVersion}") {
         transitive = false
     }
+    externalJars(group: 'org.bouncycastle', name: 'bcpg-jdk18on', version: "${bouncycastleVersion}") {
+        transitive = false
+    }
 }
 
 task updateTomlFiles {

ballerina/encrypt_decrypt.bal

@@ -243,3 +243,41 @@ public isolated function decryptAesGcm(byte[] input, byte[] key, byte[] iv, AesP
     name: "decryptAesGcm",
     'class: "io.ballerina.stdlib.crypto.nativeimpl.Decrypt"
 } external;
+
+# Returns the PGP-encrypted value for the given data.
+# ```ballerina
+# byte[] message = "Hello Ballerina!".toBytes();
+# byte[] publicKey = check io:fileReadBytes("public_key.asc"); // provide the path to the public key
+# byte[] cipherText = check crypto:encryptPgp(message, publicKey);
+# ```
+#
+# + input - The content to be encrypted
+# + key - Public key
+# + options - PGP encryption options
+# + return - Encrypted data or else a `crypto:Error` if the key is invalid
+public isolated function encryptPgp(byte[] input, byte[] key, *PgpEncryptionOptions options)
+                                       returns byte[]|Error = @java:Method {
+    name: "encryptPgp",
+    'class: "io.ballerina.stdlib.crypto.nativeimpl.Encrypt"
+} external;
+
+# Returns the PGP-decrypted value for the given PGP-encrypted data.
+# ```ballerina
+# byte[] message = "Hello Ballerina!".toBytes();
+# byte[] publicKey = check io:fileReadBytes("public_key.asc"); // provide the path to the public key
+# byte[] cipherText = check crypto:encryptPgp(message, publicKey);
+# 
+# byte[] privateKey = check io:fileReadBytes("private_key.asc"); // provide the path to the private key
+# byte[] passphrase = check io:fileReadBytes("pass_phrase.txt"); // provide the path to the passphrase
+# byte[] decryptedMessage = check crypto:decryptPgp(cipherText, privateKey, passphrase);
+# ```
+#
+# + input - The encrypted content to be decrypted
+# + key - Private key
+# + passphrase - passphrase of the private key
+# + return - Decrypted data or else a `crypto:Error` if the key or passphrase is invalid
+public isolated function decryptPgp(byte[] input, byte[] key, byte[] passphrase)
+                                       returns byte[]|Error = @java:Method {
+    name: "decryptPgp",
+    'class: "io.ballerina.stdlib.crypto.nativeimpl.Decrypt"
+} external;

ballerina/pgp_utils.bal

@@ -0,0 +1,46 @@
+// Copyright (c) 2024 WSO2 LLC. (https://www.wso2.com).
+//
+// WSO2 LLC. licenses this file to you under the Apache License,
+// Version 2.0 (the "License"); you may not use this file except
+// in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+public type PgpEncryptionOptions record {|
+    CompressionAlgorithmTags compressionAlgorithm = ZIP;
+    SymmetricKeyAlgorithmTags symmetricKeyAlgorithm = AES_256;
+    boolean armor = true;
+    boolean withIntegrityCheck = true;
+|};
+
+public enum CompressionAlgorithmTags {
+    UNCOMPRESSED = "0",
+    ZIP = "1",
+    ZLIB = "2",
+    BZIP2= "3"
+}
+
+public enum SymmetricKeyAlgorithmTags {
+    NULL = "0",
+    IDEA = "1",
+    TRIPLE_DES = "2",
+    CAST5 = "3",
+    BLOWFISH = "4",
+    SAFER = "5",
+    DES = "6",
+    AES_128 = "7",
+    AES_192 = "8",
+    AES_256 = "9",
+    TWOFISH = "10",
+    CAMELLIA_128 = "11",
+    CAMELLIA_192 = "12",
+    CAMELLIA_256 = "13"
+}

ballerina/tests/encrypt_decrypt_pgp_test.bal

@@ -0,0 +1,40 @@
+// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+//
+// WSO2 Inc. licenses this file to you under the Apache License,
+// Version 2.0 (the "License"); you may not use this file except
+// in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import ballerina/test;
+import ballerina/io;
+
+@test:Config {}
+isolated function testEncryptAndDecryptWithPgp() returns error? {
+    byte[] message = "Ballerina crypto test           ".toBytes();
+    byte[] passphrase = check io:fileReadBytes(PGP_PRIVATE_KEY_PASSPHRASE_PATH);
+    byte[] publicKey = check io:fileReadBytes(PGP_PUBLIC_KEY_PATH);
+    byte[] privateKey = check io:fileReadBytes(PGP_PRIVATE_KEY_PATH);
+    byte[] cipherText = check encryptPgp(message, publicKey);
+    byte[] plainText = check decryptPgp(cipherText, privateKey, passphrase);
+    test:assertEquals(plainText.toBase16(), message.toBase16());
+}
+
+@test:Config {}
+isolated function testEncryptAndDecryptWithPgpWithOptions() returns error? {
+    byte[] message = "Ballerina crypto test           ".toBytes();
+    byte[] passphrase = check io:fileReadBytes(PGP_PRIVATE_KEY_PASSPHRASE_PATH);
+    byte[] publicKey = check io:fileReadBytes(PGP_PUBLIC_KEY_PATH);
+    byte[] privateKey = check io:fileReadBytes(PGP_PRIVATE_KEY_PATH);
+    byte[] cipherText = check encryptPgp(message, publicKey, symmetricKeyAlgorithm = AES_128, armor = false);
+    byte[] plainText = check decryptPgp(cipherText, privateKey, passphrase);
+    test:assertEquals(plainText.toBase16(), message.toBase16());
+}

ballerina/tests/resources/pgp_private_key_passphrase.txt

@@ -0,0 +1 @@
+qCr3bv@5mj5n4eY

ballerina/tests/resources/private_key.asc

@@ -0,0 +1,99 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: Keybase OpenPGP v2.0.76
+Comment: https://keybase.io/crypto
+
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+=4NKk
+-----END PGP PRIVATE KEY BLOCK-----

ballerina/tests/resources/public_key.asc

@@ -0,0 +1,55 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: Keybase OpenPGP v2.0.76
+Comment: https://keybase.io/crypto
+
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+q4itr6nqlwCqJEoLnH0fLmzFJApSCVOMf114B/wMFw9sA9tguFiP8+YBZeXZ9WXz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+=DRCu
+-----END PGP PUBLIC KEY BLOCK-----

ballerina/tests/test_utils.bal

@@ -33,3 +33,7 @@ const string MLKEM_PRIVATE_KEY_PATH = "tests/resources/mlkem-key.pem";
 const string INVALID_KEYSTORE_PATH = "tests/resources/cert/keyStore.p12.invalid";
 const string INVALID_PRIVATE_KEY_PATH = "tests/resources/cert/private.key.invalid";
 const string INVALID_PUBLIC_CERT_PATH = "tests/resources/cert/public.crt.invalid";
+
+const string PGP_PUBLIC_KEY_PATH = "tests/resources/public_key.asc";
+const string PGP_PRIVATE_KEY_PATH = "tests/resources/private_key.asc";
+const string PGP_PRIVATE_KEY_PASSPHRASE_PATH = "tests/resources/pgp_private_key_passphrase.txt";

build-config/resources/Ballerina.toml

@@ -35,3 +35,9 @@ groupId = "org.bouncycastle"
 artifactId = "bcutil-jdk18on"
 version = "@bouncycastle.version@"
 path = "./lib/[email protected]@.jar"
+
+[[platform.java17.dependency]]
+groupId = "org.bouncycastle"
+artifactId = "bcpg-jdk18on"
+version = "@bouncycastle.version@"
+path = "./lib/[email protected]@.jar"

native/build.gradle

@@ -32,6 +32,7 @@ dependencies {
     implementation group: 'org.bouncycastle', name: 'bcpkix-jdk18on', version: "${bouncycastleVersion}"
     implementation group: 'org.bouncycastle', name: 'bcprov-jdk18on', version: "${bouncycastleVersion}"
     implementation group: 'org.bouncycastle', name: 'bcutil-jdk18on', version: "${bouncycastleVersion}"
+    implementation group: 'org.bouncycastle', name: 'bcpg-jdk18on', version: "${bouncycastleVersion}"
     compileOnly group: 'org.graalvm.nativeimage', name: 'svm', version: "${nativeImageVersion}"
 }
 

native/src/main/java/io/ballerina/stdlib/crypto/CryptoUtils.java

@@ -448,4 +448,5 @@ private static Digest selectHash(String algorithm) {
         }
         throw CryptoUtils.createError("Unsupported algorithm: " + algorithm);
     }
+
 }