To decrypt a message encrypted using rsa we need the

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To decrypt a message encrypted using rsa we need the

[{{{"type": "thumb-down", "id": "hardToUnderstand", "label": Hard to understand. "thumb-down", "id": "incorrectInformationOrSampleCode", "label": "Pops Information and Codes" },{ "type": "thumb-down", "idstand" This topic provides information about creating and using a key for asymmetric encryption using a RSA key. If you want to use

asymmetrics keys for creating and validating signatures, see Create and validate digital signatures. If you want to use symmetric keys for encryption and decryption, see Encryption and decryption data. Asymmetric encryption uses the public key part of the asymmetric key and decryption uses the private key part of the key. Cloud Key Management

The service provides functionality to recover the public key and functionality to decrypt the encrypted text that has been encrypted with the public key. Cloud KMS does not allow direct access to the private key. Before starting This topic provides examples that are executed at the command line. To simplify the use of examples, use Cloud Shell. The

encryption example uses OpenSSL, which is preinstalled on Cloud Shell. Create an asymmetric key with the key purpose of ASYMMETRIC_ DECRYPT. To see which algorithms are supported for ASYMMETRIC_DECRYPT key purposes, see asymmetric encryption algorithms. You cannot follow this procedure with a key for the purpose of

ASYMMETRIC_SIGN. If you are going to use the command line, install OpenSSL if you do not already have it. If you use Cloud Shell, OpenSSL is already installed. macOS users: The version of OpenSSL installed on macOS does not support the flags used to decrypt the data in this topic. To followSteps on macOS, install OpenSSL from Homebrew.

Access control to the key For a user or service that recovers the public key, grant the cloudkms.cryptoKeyVersions.viewPublicKey permission on the asymmetric key. The public key is required for data encryption. For a user or service that decrypts data encrypted with the public key, grant the cloudkms.cryptoKeyVersions.useToDecrypt permission on

the asymmetric key. Discover the permits and roles in Cloud KMS at Permissions and Roles. Data encryption To encrypt data using an asymmetric encryption key, recover the public key and use the public key to encrypt data. Note: Clear text data you want to encrypt should not be larger than 64 KiB (65,536 bytes). This sample requires OpenSSL to

be installed on the local system. Download the public key Download the public key: gcloud kms key version get-public-key key-version \ --key key \ --keyring key-ring \ --location location \ --output-file public-key-path Replace key-version with the key version that has the public key. Replace the key with the key name. Replace the key ring with the name

of the key ring in which the key is located. Replace the location with the Cloud KMS location for the key ring. Replace the public-key path with the location to save the public key on the local system. Encrypt your data using the public key you just downloaded and save the output in a file: pkeyutl opens -in clatext-data-input-file \ -encrypt \ -pubin \ inkey public-key-path \ -pkeyopt rsa_padding_mode:oaep \ -pkeyopt rsa_oaep_md:sha256 \ -pkeyopt rsa_mgf1_md:sha256\ > cipher-data-out Replace the public-key path with the name of the path and the file where you downloaded thepublic. Replace the encrypted-data-output file with the path name and file to save encrypted data. To run this code,

first set up a C# development environment and install the KMS C# SDK cloud. To use Cloud KMS in command commandfirst install or update the latest version of cloud sdk. crypto/rand crypto/rsa crypto/sha256 crypto/x509 encoding/pem fmt io kms cloud.go/locations/kms/apiv1 kmspb

google.genproto/googleapis/cloud/kms/vRY Background)(client, err := kms.NewKeyManagementClient(ctx) if err!=nil { return fmt. Errorf("failed to create kms client: %v," err) } defer client. close)(/recover the public key from cloud kms. this is the only operation that // involves cloud kms. the remaining operations take place on your

machine // local. reply, errr := client.GetPublicKey(ctx, &kmspb.GetPublicKeyRequest{ name: se err!= nil { return fmt. Errorf("failed to get the public key: ) // parsare the public key. Note, this example assumes that the public key is in the // rsa format. ,_= pem.Decode([]byte(response. Pem) publickey, err := x509.ParsePKIXPublicKey(block.Bytes) if

err!= nil { return fmt. Errorf("result to public key: (iii) rsa key, ok := publicKey.(*rsa.PublicKey) if!ok { fmt return. Errorf("public key is not rsa") } // convert the message to byte. cryptographic plane texts and // cryptographic texts are always byte arrays. normal text:= []byte(message) // encrypt data using the public key rsa. ciphertext, errr :=

rsa.EncryptOAEP(sha256.New,) rand. reader, rsakey, plaintext, nil) if err!= nil { return fmt. Errorf("rsa.EncryptOAEP: %v," err) } fmt.Fprintf(w, "encryptotext: %v," ciphertext) return nil } to run this code, first set a java development environment and install the cloud kms java sdk. importimport

com.google.cloud.kms.v1.KeyManagementServiceClient; import com.google.cloud.kms.v1. PublicKey; import java.io. BufferedReader; import java.io. IOException; import java.io. StringReader; import java.nio.charset. StandardCharsets; import java.security. GeneralSecurityException; import java.security. KeyFactory; import

java.security.spec.MGF1ParameterSpec; import java.security.spec.X509EncodedKeySpec; import java.util. Base64; import java.util.stream.Collectors; import javax.crypto. Cipher; import javax.crypto.spec.OAEPParameterSpec; javax. PSource; public class EncryptAsymmetric {public vacuum crypt Asymmetric() launches IOException,

GeneralSecurityException {/ TODO(development): Replace these variables before performing the sample. Stress project Id = "your project-id"; Id string position = "us-east1"; String keyRing Id = "my-key-ring"; String keyId = "my-key"; String keyVersion Id = "123"; String plaintext = "Plaintext to encrypt"; encrypt Asymmetric(projectId, Id position,

keyRingId, keyId, keyVersionId, plaintext); } // Encrypt the data that has been encrypted using the public key component of the version // date key. public vacuum encrypts Asymmetric(Stress project Id, Id string position, String keyRing Id, String key Id, String keyVersion Id, String plaintext) launches IOException, GeneralSecurityException

{/Initialize the client that will be used to send requests. This client must be created once and can be reused for multiple requests. After // by completing all your requests, call the "close" method on the client to // safely clean the remaining background resources. Try (KeyManagementServiceClient Client = KeyManagementServiceClient.create()))

{/Building the name of the key version from the project, location, key ring, key,/ and key version. CryptoKeyVersionName keyVersionName = CryptoKeyVersionName.of(project Id, locationId,keyId, keyVersionId); // Take the public key. PublicKey publicKey = client.getPublicKey (keyVersionName); // Convert the publickey to a der key (see helper

below) byte[] derkey = convertPemToDer(publicKey.getPem()); x509encoded keyspec keyspec = new x509encodedkeyspec (derkey;) java.security. PublicKey rsa KeyFactory.getInstance("RSA").generatePublic(keySpec); // Encrypt clear text for the 'RSA_DECRYPT_OAEP_2048_SHA256' key. // for other key algorithms: / cipher =

Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding"); oaepparameterspec oaepparams = new OAEPParameterSpec byte privati[] ConvertiPemToDer(String pem) { bufferedreader bufferedreader = new BufferedReader(new StringReader(pem)); string encoded = bufferedreader .lines() .filter(linea ->!starts Con("---BEGIN")

&&code!starts Con("-END") .collect } } } to run this code, first set a Node.js development environment and install the cloud kms Node.js sdk. to run this code, first, learn to use php on google cloud and install cloud kms php sdk. to run this code, first set up a python development environment and install the cloud kms python sdk.

defcrypt_asymmetric(project_id, location_id, key_ring_id, key_id, version_id, plaintext): "" encrypt plaintext using the public key part of an asymmetric key. args: project_id (string): google cloud project id (e.g. 'my-project'). location_id (stringa): cloud location kms (e.g. 'us-east1'). key_ring_id (string): id of the key ring cloud kms (e.g. 'my-key-ring').

key_id (string): id of the key to be oare (e.g. 'my-key').(string): Key version ID (e.g. '1'). Clear text (string): message to encrypt Resi: byte: encrypted text. "" # Imports the client library. from Google. # Import base64 to print the encrypted text. import basis 64 # Import cryptographic helpers from the encryption package. by

cryptography.hazmat.backends import default_backend from cryptography. hazmat.primitives import hashes, serialization by cryptography.hazmat.primitives. asymmetric import Filling # Convert the text in poor words. plaintext_bytes = plaintext.encode('utf-8') # Create the client. client = km.KeyManagementServiceClient() # Build the name of the

key version. key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, version_id) # Take the public key. public_key = client.get_public_key(request={'name': key_version_name}) # Extract and analyze the public key as coded RSA PEM. pem = public_key.pem.encode('utf-8') rsa_key =

serialization.load_pem_public_key(pem, default_backend() # Build the padding. Note that the padding differs according to the key choice. sha256 = hashes.SHA256() mgf = padding. MGF1 (algorithm=sha256) pad = padding. OAEP (mgf=mgf, algorithms=sha256, label=None) # Encrypt data using public key. ciphertext =

rsa_key.encrypt(plaintext_bytes, pad) print('Ciphertext: {}'.format(base64.b64encode(ciphertext)))))))))) encrypted text return To run this code, first set a Ruby development environment and install the Cloud KMS Ruby SDK. Use Cloud KMS to decrypt. To use Cloud KMS on the command line, first install or update the latest version of Cloud SDK.

gcloud kms asymmetric-decrypt \ --version key-version \ --key key key-ring \ --position location \ --ciphertext-file file-path-with-encrypted \ --plaintext-file file-path-to-store-plaintext-text-plaintext-text-filethe key version with the key version, or omit the flag --version to automatically detect the version. Replace the key with the name of theto use for

decryption. Replace the key ring with the key ring name where the key will be placed. Replace the location with the Cloud KMS location for the key ring. Replace file-path-with-encrypted-data and file-path-to-store-plaintext with local file paths to read encrypted data and save decrypted output. For information about all flags and possible values, please

run the command with the --help flag. To view the decrypted file content, open it in your editor or terminal. Here is an example that shows the content of the file using the cat command: cat ./my-file.txt To run this code, first set a C# development environment and install the KMS C# SDK cloud. To run this code, first set a Go development environment

and install the cloud KMS Go SDK. import (context) "fmt" "hash/crc32" "io" kms "cloud.go/kms/apiv1" kmspb "google.golang/genproto/googleapis/cloud/kms/v1" Background() client, err := kms.NewKeyManagementClient(ctx) if err!=nil { return fmt. Errorf("failed to create kms client: %v", err) } defer client. Close() // Optional but

recommended: CRC32C. crc32c := func(data []byte) uint32 {t := crc32.MakeTable(crc32.Castagnoli) return crc32.Checksum(data, t) } ciphertextCRC32C := crc32c(ciphertext) // Build the request. req := &kmspb.AsymmetricDecryptRequest{ Name: Name, Ciphertext: ciphertext, CiphertextCrc32C: wrapperspb.Int64(int64(ciphertextCRC32C)), } //

Call the API. the result, err := customer. AsymmetricDecrypt(ctx, req) if err!= Nil:Fmt. Errorf("failed to decrypt ciphertext: %v", err) } // Optional, but recommended: perform the integrity check on the result. // For more details on the E2E transit integrity guarantee from and to visit Cloud KMS: // if the result. VerifiedCiphertextCrc32C == false {

return fmt. Errorf("AsymmetricDecrypt: corrupt in-transit request") if int64(crc32c(result.Plaintext))))) Translation: result. PlaintextCrc32C.Value {fmt return. Errorf("AsymmetricDecrypt: in-transit corrupt response") fmt.Fprintf(w, "Decrypted plaintext: %s", result. Text of text) To run this code, first set up a Java development environment and install

the KMS Java SDK cloud. import com.google.cloud.kms.v1. AsymmetricDecryptResponse; import com.google.cloud.kms.v1. CryptoKeyVersionName; import com.google.cloud.kms.v1.KeyManagementServiceClient; import com.google.protobuf.ByteString; Replace these variables before performing the sample. Stress project Id = "your project-id"; Id =

"us-east1" string position; String keyRing Id = "my-key-ring"; String keyId = "my-key"; String keyVersion Id = "123"; byte[] ciphertext = null; decryptAsymmetric(projectId, Id location, keyRingId, keyId, keyVersionId, ciphertext); } // Decrypt the data that has been encrypted using the public key component of the version // date key. public vacuum

decryptAsymmetric(Id stress project, Id string position, String keyRing Id, String key Id, String keyVersion Id, byte[] ciphertext) launches IOException { // Initiality client that will be used to send requests. This client must be created once and can be reused for multiple requests. After // by completing all your requests, call the "close" method on the

client to // safely clean the remaining background resources. try (KeyManagementServiceClient Client =// Construction ConstructionKey name of the version from the project, location, keychain, key, // and key version. CryptoKeyVersionName keyVersionName = CryptoKeyVersionName.of(project Id, locationId, keyRingId, keyId, keyVersionId); //

Decrypt the encrypted text. AsymmetricDecryptResponse reply = client.asymmetricDecrypt (keyVersionName, ByteString.copyFrom(ciphertext)); System.out.printf("Plaintext: %s%n", response.getPlaintext().toStringUtf8()); } } } } To run this code, first set a Node.js development environment and install the KMS Node.js SDK cloud. To run this code,

first, learn how to use PHP on Google Cloud and install the KMS PHP SDK cloud. To run this code, first set a Python development environment and install the KMS Python SDK. defcrypt_asymmetric(project_id, location_id, key_ring_id, key_id, version_id, ciphertext): """" Decrypt the encrypted text using an asymmetric key. Args: project_id (string):

Google Cloud project ID (e.g. 'my-project'). location_id (stringa): Cloud KMS position (e.g. 'us-east1'). key_ring_id (string): Cloud KMS key ring ID (e.g. my-key-ring). key_id (string): Key ID (e.g. my-key). version_id (string): Key version ID (e.g. '1'). encrypted text (bytes): encrypted bytes to decipher. Resis: DecryptResponse: Answer included the normal

text. "" # Imports the client library. from Google. # Create the client. client = km.KeyManagementServiceClient() # Build the name of the key version. key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, version_id) # Optional, but recommended: CRC32C calculation of the cipher. See crc32c() function

defined below. ciphertext_crc32c = crc32c(ciphertext) # Calls the API. decrypt_response = client.asymmetric_decrypt( request={'name': key_version_name, 'ciphertext': ciphertext, 'ciphertext_crc32c':# Optional, but recommended: perform integrity verification on decrypt_response. # For more details on how to ensure in-transit integrity E2E E2Eby

Cloud KMS visit: # if not decrypt_response.verified_ciphertext_crc32c: raise Exception('The request sent to the server was corrupted in-transit') if not decrypt_response {text_crc32c=trans """" Calculate the CRC32C control of the provided data. Args: data: the bytes on which you have to calculate the checksum. Hold on. Int representing the CRC32C

checksum of the bytes provided. "" import crcmod imports six crc32c_fun = crcmod.predefined.mkPredefinedCrcFun('crc-32c') return crc32c_fun(six.ensure_binary(data)))) To run this code, first set up a Ruby development environment and install the Cloud KMS Ruby SDK. These examples use curl as an HTTP client to demonstrate API usage. For

more information on access control, see Access to the Cloud KMS API. Use the CryptoKeyVersions.asymmetricDecrypt method. Troubleshooting with the wrong key purpose: _ You can only decrypt data with a key with the ASYMMETRIC_ DECRYPT key. Not valid parameter during decryption on macOS The version of OpenSSL installed on macOS

does not support flags used to decrypt data in this topic. To follow these steps on macOS, install OpenSSL from Homebrew. too large data for key size The maximum load size useful for decryption RSA depends on the key size and the filling algorithm. All RSA encryption formats used by Cloud KMS use OAEP, standardized in RFC 2437. As a quick

reference, the following algorithms support the following maximum load dimensions (maxMLen): Algorithm parameters Maximum message length RSA_DECRYPT_OAEP_2048_SHA256 k = 256; hLen = 32; maxMLen = 190 RSA_DECRYPT_OAEP_3072_SHA256 k = 384;= 32; maxMLAEP_ maxMLAEP_= 446 RSA_DECRYPT_OAEP_4096_SHA512 k =

512; hLen = 64; maxMLen = 382 Asymmetric encryption is not recommended for messages of variable lengths that can be larger than these limits. Consider using hybrid encryption instead. Tink is a cryptographic library that uses this approach. approach.

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