--- product: Chilkat product_version: 11.7.0 language: dataflex language_label: DataFlex class: PublicKey license: free deprecated: false reference_html: https://www.chilkatsoft.com/refdoc/dataflexPublicKeyRef.html --- # Chilkat PublicKey — DataFlex — v11.7.0 > Chilkat 11.7.0 · language=dataflex · class=PublicKey > Other versions: replace `11.7.0` in this URL. Other languages: `https://www.chilkatsoft.com/ai-docs/v/11.7.0//classes/PublicKey.md`. > Language-wide rules (install, unlock, error model, strings/bytes): `https://www.chilkatsoft.com/ai-docs/v/11.7.0/dataflex/guide.md`. ## Purpose PublicKey **Load, inspect, convert, export, and use public-key material.** `PublicKey` represents one public key at a time and provides loading, inspection, and format-conversion operations. It can load keys from many common formats, including DER, PEM, XML, JWK, Base64 DER, RFC 4716 SSH2 blocks, raw ECDSA coordinates, and Ed25519 hex, then export them as DER, PEM, encoded DER, JWK, XML, or files. Public keys are commonly used for signature verification, encryption, JWT/JWS validation, SSH-related workflows, and interoperability with certificates, private keys, and external cryptographic systems. **Load public keys** Import public keys from PEM, DER, XML, JWK, Base64 DER, RFC 4716 SSH2 blocks, raw ECDSA coordinates, or Ed25519 hex. **Export and convert** Convert public keys to DER, PEM, encoded DER, JWK, XML, or file-based output for use by other systems and APIs. **Work with key types** Represent public keys for RSA, DSA, ECDSA, Ed25519, and related public-key cryptographic workflows. **Verify signatures** Pass public keys to Chilkat classes that verify signatures, JWTs, JWS objects, signed data, or protocol-specific authentication messages. **Encrypt or validate data** Use public-key material for operations where the public half of a key pair is required, such as encryption or verification. **Interoperate with certs and keys** Use `Cert` to obtain a public key from an X.509 certificate, or use `PrivateKey` to obtain the public portion of an encrypted private key. **Common pattern:** Each object holds zero or one key. A successful load replaces the current key, and every failed load clears it. General loaders can accept supported unencrypted private-key representations and retain only their public portion. Direct X.509 certificate input and encrypted private-key input are not supported. Load certificates with `Cert`, and load encrypted private keys with `PrivateKey`, then obtain the public key from those objects. For an extended overview, see [PublicKey Class Overview](https://www.chilkatsoft.com/publickey_class_overview.asp). ## Object creation, unlocking and error handling **Object Creation** ```dataflex // (Dataflex programs use the 32-bit Chilkat ActiveX) Handle hoPublicKey Get Create(RefClass(cComPublicKey)) to hoPublicKey ``` Call `Global.UnlockBundle` once at the start of the program, before using this or any other Chilkat class. Any string unlocks a fully functional 30-day trial; a purchased unlock code is used in production. See `guide.md` for the exact code in DataFlex. How failure is reported depends on the method's return type and is stated in the note under each method below. In every case the diagnostic text is in the `LastErrorText` property of the object whose method was called. ## Members common to every Chilkat class Documented once per language in `common-members.md`; listed here so this page is self-contained. | Property | Signature | Access | Meaning | |---|---|---|---| | `DebugLogFilePath` | `Function ComDebugLogFilePath Returns String Procedure Set ComDebugLogFilePath String value` | read/write | If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. | | `LastBinaryResult` | `Function ComLastBinaryResult Returns Variant` | read-only | This property is mainly used in SQL Server stored procedures to retrieve binary data from the last method call that returned binary data. | | `LastErrorHtml` | `Function ComLastErrorHtml Returns String` | read-only | Provides HTML-formatted information about the last called method or property. | | `LastErrorText` | `Function ComLastErrorText Returns String` | read-only | Provides plain text information about the last called method or property. | | `LastErrorXml` | `Function ComLastErrorXml Returns String` | read-only | Provides XML-formatted information about the last called method or property. | | `LastMethodSuccess` | `Function ComLastMethodSuccess Returns Boolean Procedure Set ComLastMethodSuccess Boolean value` | read/write | Indicates the success or failure of the most recent method call: `True` means success, `False` means failure. | | `LastStringResult` | `Function ComLastStringResult Returns String` | read-only | In SQL Server stored procedures, this property holds the string return value of the most recent method call that returns a string. | | `LastStringResultLen` | `Function ComLastStringResultLen Returns Integer` | read-only | The length, in characters, of the string contained in the LastStringResult property. | | `VerboseLogging` | `Function ComVerboseLogging Returns Boolean Procedure Set ComVerboseLogging Boolean value` | read/write | If set to `True`, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. | | `Version` | `Function ComVersion Returns String` | read-only | Version of the component/library, such as "10.1.0" | ## Member index | Member | Kind | Signature | |---|---|---| | `Empty` | property, read-only | `Function ComEmpty Returns Boolean` | | `KeySize` | property, read-only | `Function ComKeySize Returns Integer` | | `KeyType` | property, read-only | `Function ComKeyType Returns String` | | `GetDer` | method | `Function ComGetDer Boolean preferPkcs1 Returns Variant` | | `GetDerBd` | method | `Function ComGetDerBd Boolean preferPkcs1 cComChilkatBinData bd Returns Boolean` | | `GetEncoded` | method | `Function ComGetEncoded Boolean preferPkcs1 String encoding Returns String` | | `GetJwk` | method | `Function ComGetJwk Returns String` | | `GetJwkThumbprint` | method | `Function ComGetJwkThumbprint String hashAlg Returns String` | | `GetPem` | method | `Function ComGetPem Boolean preferPkcs1 Returns String` | | `GetXml` | method | `Function ComGetXml Returns String` | | `LoadBase64` | method | `Function ComLoadBase64 String keyStr Returns Boolean` | | `LoadBd` | method | `Function ComLoadBd cComChilkatBinData bd Returns Boolean` | | `LoadEcdsa` | method | `Function ComLoadEcdsa String curveName String Qx String Qy Returns Boolean` | | `LoadEd25519` | method | `Function ComLoadEd25519 String pubKey Returns Boolean` | | `LoadFromBinary` | method | `Function ComLoadFromBinary Variant keyBytes Returns Boolean` | | `LoadFromFile` | method | `Function ComLoadFromFile String path Returns Boolean` | | `LoadFromString` | method | `Function ComLoadFromString String keyString Returns Boolean` | | `SaveDerFile` | method | `Function ComSaveDerFile Boolean preferPkcs1 String path Returns Boolean` | | `SavePemFile` | method | `Function ComSavePemFile Boolean preferPkcs1 String path Returns Boolean` | | `SaveXmlFile` | method | `Function ComSaveXmlFile String path Returns Boolean` | ## Properties ### PublicKey.Empty `Chilkat 11.7.0 · dataflex · PublicKey · Empty · property · read-only · since 9.5.0.87` ```dataflex Function ComEmpty Returns Boolean ``` Returns `True` if no public key is currently loaded, and `False` if this object contains a public key. A newly constructed `PublicKey` object is empty. A `PublicKey` object holds at most one key. Every successful load replaces the current key. Every failed load clears the object; a previously loaded key is never preserved after a load failure. ### PublicKey.KeySize `Chilkat 11.7.0 · dataflex · PublicKey · KeySize · property · read-only · since 9.5.0.67` ```dataflex Function ComKeySize Returns Integer ``` Returns the key size in bits. The meaning is algorithm-specific: | Key type | Reported size | | :--- | :--- | | RSA | The bit length of the RSA modulus, such as 2048. | | DSA | The bit length of the prime parameter `p`. | | EC | The size of the curve field, such as 256 for P-256. | | Ed25519 | 256\. | | Empty object | 0\. | **Security strength:** Key sizes are not directly comparable across algorithms. For example, a 256-bit EC key and a 2048-bit RSA key have different encodings and security characteristics. ### PublicKey.KeyType `Chilkat 11.7.0 · dataflex · PublicKey · KeyType · property · read-only · since 9.5.0.52` ```dataflex Function ComKeyType Returns String ``` Returns the type of public key currently held by this object. | Value | Meaning | | :--- | :--- | | `empty` | No public key is loaded. | | `rsa` | An RSA public key. | | `dsa` | A DSA public key. | | `ecc` | An elliptic-curve public key, commonly used with ECDSA or ECDH. | | `ed25519` | An Ed25519 public key. | **Key type versus key format:** The key type identifies the cryptographic algorithm. DER, PEM, JWK, and XML are representations of the same key material, not additional key types. X25519 keys are not supported by this class. ## Methods ### PublicKey.GetDer `Chilkat 11.7.0 · dataflex · PublicKey · GetDer · method · since 9.5.0.58` ```dataflex Function ComGetDer Boolean preferPkcs1 Returns Variant ``` Returns the public key as binary DER. `preferPkcs1` is a historical format-preference flag whose exact effect depends on the key type: | Key type | `preferPkcs1 = True` | `preferPkcs1 = False` | | :--- | :--- | :--- | | RSA | PKCS #1 `RSAPublicKey` containing the modulus and exponent. | X.509 `SubjectPublicKeyInfo` using the RSA OID `1.2.840.113549.1.1.1`. | | EC | X.509 `SubjectPublicKeyInfo` using a named-curve OID. | X.509 `SubjectPublicKeyInfo` containing explicit EC domain parameters. | | Ed25519 | X.509 `SubjectPublicKeyInfo` using OID `1.3.101.112`. | The same Ed25519 `SubjectPublicKeyInfo` representation. | For DSA, Chilkat returns its supported DSA DER representation. The method fails if this object is empty. **EC behavior:** For EC keys, `preferPkcs1` does not select PKCS #1. It selects the concise named-curve encoding when `True` and the larger explicit-parameter encoding when `False`. Returns `null` on failure ### PublicKey.GetDerBd `Chilkat 11.7.0 · dataflex · PublicKey · GetDerBd · method · since 11.0.0` ```dataflex Function ComGetDerBd Boolean preferPkcs1 cComChilkatBinData bd Returns Boolean ``` Writes the public key as binary DER to `bd`. `preferPkcs1` selects the representation using the same RSA, EC, DSA, and Ed25519 rules described for `GetDer`. `bd` is replaced; data already present in the `BinData` is not appended to. If the method fails, including when this object is empty, `bd` is cleared. **Preferred binary export:** Use this method instead of the legacy byte-array-returning `GetDer` when working with binary data in newer code. Returns True for success, False for failure. ### PublicKey.GetEncoded `Chilkat 11.7.0 · dataflex · PublicKey · GetEncoded · method · since 9.5.0.58` ```dataflex Function ComGetEncoded Boolean preferPkcs1 String encoding Returns String ``` Returns the DER representation selected by `preferPkcs1`, encoded as text using the binary encoding named by `encoding`. The DER-selection rules are the same as for `GetDer`. | Common `encoding` value | Output encoding | | :--- | :--- | | `base64` | Standard Base64 with no line breaks. This is the most common choice for textual DER. | | `base64Url` | URL-safe Base64, useful when key bytes must appear in URLs or JSON-oriented protocols. | | `hex` | Uppercase hexadecimal. | | `hexLower` | Lowercase hexadecimal. | Encoding names are case-insensitive. See the [Chilkat Binary Encoding List](https://cknotes.com/chilkat-binary-encoding-list/) for the complete set of supported encoding names. An empty or unsupported encoding name causes the method to fail. The method also fails if this object is empty. Returns `null` on failure ### PublicKey.GetJwk `Chilkat 11.7.0 · dataflex · PublicKey · GetJwk · method · since 9.5.0.66` ```dataflex Function ComGetJwk Returns String ``` Returns the public key as a compact JWK (JSON Web Key). Binary values use Base64url encoding without padding. Repeated calls for the same key produce the same compact member order. **RSA:** ``` {"kty":"RSA","n":"BASE64URL_MODULUS","e":"BASE64URL_EXPONENT"} ``` **EC:** ``` {"kty":"EC","crv":"P-256","x":"BASE64URL_X","y":"BASE64URL_Y"} ``` **Ed25519:** ``` {"kty":"OKP","crv":"Ed25519","x":"BASE64URL_PUBLIC_KEY"} ``` Only public key parameters are emitted. Private members and optional JWK metadata are not included. The method fails if this object is empty or if the loaded key type cannot be represented as a supported JWK. **RSA exponent:** The value `AQAB` commonly represents exponent 65537, but the actual exponent from the loaded RSA key is exported. Returns `null` on failure ### PublicKey.GetJwkThumbprint `Chilkat 11.7.0 · dataflex · PublicKey · GetJwkThumbprint · method · since 9.5.0.66` ```dataflex Function ComGetJwkThumbprint String hashAlg Returns String ``` Returns the RFC 7638 JWK thumbprint for this public key. Chilkat constructs the required canonical JSON object from the public JWK members, hashes its UTF-8 representation using the algorithm named by `hashAlg`, and returns the digest using Base64url encoding without padding. Accepted algorithm names are `md5`, `sha1`, `sha256`, `sha384`, and `sha512`. Names are case-insensitive. An empty or unsupported algorithm name causes the method to fail. `sha256` is the conventional choice for RFC 7638 thumbprints. The method fails if this object is empty or if the key cannot be represented as a supported JWK. **Not a certificate thumbprint:** A JWK thumbprint identifies public key parameters. An X.509 certificate fingerprint hashes the complete DER-encoded certificate and is therefore a different value. Returns `null` on failure ### PublicKey.GetPem `Chilkat 11.7.0 · dataflex · PublicKey · GetPem · method · since 9.5.0.58` ```dataflex Function ComGetPem Boolean preferPkcs1 Returns String ``` Returns the public key in PEM format. `preferPkcs1` selects the underlying DER representation as follows: | Key type | `preferPkcs1 = True` | `preferPkcs1 = False` | | :--- | :--- | :--- | | RSA | `RSA PUBLIC KEY`, containing PKCS #1 `RSAPublicKey`. | `PUBLIC KEY`, containing X.509 `SubjectPublicKeyInfo`. | | EC | `PUBLIC KEY` with named-curve parameters. | `PUBLIC KEY` with explicit EC domain parameters. | | Ed25519 | `PUBLIC KEY`. | The same `PUBLIC KEY` representation. | PEM output uses CRLF line endings, Base64 body lines of at most 64 characters, and a final CRLF after the closing boundary line. The method fails if this object is empty. **PEM is DER plus text armor:** The Base64 body contains the DER representation selected by `preferPkcs1`. The boundary label identifies the enclosed structure. Returns `null` on failure ### PublicKey.GetXml `Chilkat 11.7.0 · dataflex · PublicKey · GetXml · method` ```dataflex Function ComGetXml Returns String ``` Returns the public key in Chilkat XML format. The exact representation depends on the key type. **RSA:** ``` BASE64_MODULUSBASE64_EXPONENT ``` **DSA:** ```

BASE64_P

BASE64_Q BASE64_G BASE64_Y ``` **EC:** ``` BASE64_DER ``` For EC keys, the `curve` attribute contains the Chilkat curve name, the `x` and `y` attributes contain full-width uppercase hexadecimal coordinates, and the element text contains a Base64-encoded DER public-key structure with explicit curve parameters. **Ed25519:** ``` BASE64_32_BYTE_PUBLIC_KEY ``` The returned XML can be loaded by `LoadFromString`, `LoadFromFile`, or `LoadBd`. The method fails if this object is empty. **Interoperability note:** These XML forms are Chilkat representations. For interchange with non-Chilkat systems, PEM, DER, or JWK is usually preferable. Returns `null` on failure ### PublicKey.LoadBase64 `Chilkat 11.7.0 · dataflex · PublicKey · LoadBase64 · method · since 9.5.0.47` ```dataflex Function ComLoadBase64 String keyStr Returns Boolean ``` Loads a public key from standard Base64-encoded DER in `keyStr`. Whitespace within the Base64 text is permitted. The decoded DER is inspected to determine the key type and structure. For RSA, both PKCS #1 `RSAPublicKey` and X.509 `SubjectPublicKeyInfo` are recognized. A complete PEM string is also accepted, including its `BEGIN`/`END` boundary lines. Base64url text, arbitrary non-PEM text surrounding the encoded data, X.509 certificates, and encrypted private keys are not accepted. A successful load replaces the current key. A failed load clears this object. **Certificates and encrypted private keys:** Direct X.509 certificate input is not supported. Load a certificate with a `Cert` object and obtain its public key from the certificate. Encrypted private-key input is also not supported by this class; load and decrypt it with a `PrivateKey` object, then obtain the corresponding public key. **DER terminology:** The general X.509 public-key wrapper is `SubjectPublicKeyInfo`. It is sometimes informally called a “PKCS #8 public key,” although PKCS #8 formally defines private-key syntax. Returns True for success, False for failure. ### PublicKey.LoadBd `Chilkat 11.7.0 · dataflex · PublicKey · LoadBd · method · since 9.5.0.83` ```dataflex Function ComLoadBd cComChilkatBinData bd Returns Boolean ``` Loads a public key from the data in `bd`. The `BinData` may contain binary DER or any textual representation recognized by `LoadFromString`, including PEM, Chilkat XML, JWK, standard Base64 DER, and supported RFC 4716 SSH2 public-key blocks. Public keys and unencrypted private keys are accepted; when private-key material is supplied, only the public portion is retained. For binary DER, the first recognized DER object is loaded and trailing bytes are ignored. Hex-encoded DER, Base64url-encoded DER, one-line OpenSSH public keys, X.509 certificates, and encrypted private keys are not recognized. JWK required-member and metadata behavior is the same as described for `LoadFromString`. A successful load replaces the current key. A failed load clears this object. **Certificates and encrypted private keys:** Direct X.509 certificate input is not supported. Load a certificate with a `Cert` object and obtain its public key from the certificate. Encrypted private-key input is also not supported by this class; load and decrypt it with a `PrivateKey` object, then obtain the corresponding public key. **Recommended general-purpose loader:** Use this method when the key data may be binary or text, or when the precise representation is not known in advance. Returns True for success, False for failure. ### PublicKey.LoadEcdsa `Chilkat 11.7.0 · dataflex · PublicKey · LoadEcdsa · method · since 9.5.0.85` ```dataflex Function ComLoadEcdsa String curveName String Qx String Qy Returns Boolean ``` Loads an elliptic-curve public key directly from its affine point coordinates. `curveName` names the curve, `Qx` is the hexadecimal x-coordinate (`Qx`), and `Qy` is the hexadecimal y-coordinate (`Qy`). The coordinate strings must contain exactly the full field width for the selected curve. Uppercase and lowercase hexadecimal are accepted. A `0x` prefix, whitespace, separators, extra leading zero bytes, shortened coordinates, non-hexadecimal characters, empty values, and all-zero coordinates are rejected. Curve names are case-insensitive. | Supported curve | Description and aliases | | :--- | :--- | | `secp256r1` | NIST P-256; also known as `P-256` and `prime256v1`. | | `secp384r1` | NIST P-384; also known as `P-384`. | | `secp521r1` | NIST P-521; also known as `P-521`. | | `secp256k1` | The 256-bit Koblitz curve used by Bitcoin. | | `secp192r1` | 192-bit SEC/NIST curve. | | `secp224r1` | 224-bit SEC/NIST curve. | | `brainpoolP160r1` | 160-bit Brainpool curve. | | `brainpoolP192r1` | 192-bit Brainpool curve. | | `brainpoolP224r1` | 224-bit Brainpool curve. | | `brainpoolP256r1` | 256-bit Brainpool curve. | | `brainpoolP320r1` | 320-bit Brainpool curve. | | `brainpoolP384r1` | 384-bit Brainpool curve. | | `brainpoolP512r1` | 512-bit Brainpool curve. | A successful load replaces the current key. A failed load clears this object. The method validates syntax, coordinate width, and obvious zero values, but it does not fully verify that the supplied coordinates form a point on the named curve. **Raw coordinates versus encoded keys:** Use this method only when the curve name and separate x/y coordinates are already available. For DER, PEM, JWK, XML, or other complete key representations, use `LoadBd`, `LoadFromString`, or `LoadFromFile`. Returns True for success, False for failure. ### PublicKey.LoadEd25519 `Chilkat 11.7.0 · dataflex · PublicKey · LoadEd25519 · method · since 9.5.0.83` ```dataflex Function ComLoadEd25519 String pubKey Returns Boolean ``` Loads a raw Ed25519 public key from the hexadecimal string in `pubKey`. `pubKey` must contain exactly 64 hexadecimal characters representing 32 bytes. Uppercase and lowercase hexadecimal are accepted. A `0x` prefix, whitespace, separators, non-hexadecimal characters, odd-length input, and values shorter or longer than 32 bytes are rejected. A successful load replaces the current key; a failed load clears this object. This method validates the hexadecimal syntax and exact byte count. It does not determine whether every 32-byte value is a usable Ed25519 public point; for example, an all-zero 32-byte value is accepted. **Ed25519 is not X25519:** Ed25519 is a signature system and X25519 is a key-agreement system. Their public keys are not interchangeable, and X25519 keys are not supported by this class. Returns True for success, False for failure. ### PublicKey.LoadFromBinary `Chilkat 11.7.0 · dataflex · PublicKey · LoadFromBinary · method · since 9.5.0.58` ```dataflex Function ComLoadFromBinary Variant keyBytes Returns Boolean ``` Loads a public key from binary DER in `keyBytes`. The DER structure and key type are detected automatically. Public-key DER and unencrypted private-key DER are accepted; when private-key material is supplied, only the public portion is retained. For RSA, both PKCS #1 `RSAPublicKey` and X.509 `SubjectPublicKeyInfo` are recognized. The loader parses the first recognized DER object and ignores trailing bytes, including a second concatenated DER object. A successful load replaces the current key. A failed load clears this object. **Certificates and encrypted private keys:** Direct X.509 certificate input is not supported. Load a certificate with a `Cert` object and obtain its public key from the certificate. Encrypted private-key input is also not supported by this class; load and decrypt it with a `PrivateKey` object, then obtain the corresponding public key. **Preferred API:** This byte-array method is retained for compatibility. New applications should generally place the data in a `BinData` object and call `LoadBd`. Returns True for success, False for failure. ### PublicKey.LoadFromFile `Chilkat 11.7.0 · dataflex · PublicKey · LoadFromFile · method · since 9.5.0.58` ```dataflex Function ComLoadFromFile String path Returns Boolean ``` Loads a public key from the local filesystem path specified by `path`. Chilkat examines the file contents rather than the filename extension. Supported content includes binary DER, PEM, Chilkat XML, JWK, standard Base64 DER, and RFC 4716 SSH2 public-key blocks for supported RSA and Ed25519 keys. Public keys and unencrypted private keys are accepted. When private-key material is supplied, only the public portion is retained. Hex-encoded DER, Base64url-encoded DER, one-line OpenSSH public keys, X.509 certificates, and encrypted private keys are not recognized. For PEM files, UTF-8 BOMs, CRLF or LF line endings, surrounding text, and unrelated PEM blocks are tolerated. If multiple recognized key blocks are present, the first recognized key is loaded. For binary DER, the first recognized DER object is loaded and trailing bytes are ignored. JWK required-member and metadata behavior is the same as described for `LoadFromString`. A successful load replaces the current key. A failed load clears this object. **Certificates and encrypted private keys:** Direct X.509 certificate input is not supported. Load a certificate with a `Cert` object and obtain its public key from the certificate. Encrypted private-key input is also not supported by this class; load and decrypt it with a `PrivateKey` object, then obtain the corresponding public key. Returns True for success, False for failure. ### PublicKey.LoadFromString `Chilkat 11.7.0 · dataflex · PublicKey · LoadFromString · method · since 9.5.0.58` ```dataflex Function ComLoadFromString String keyString Returns Boolean ``` Loads a public key from the string in `keyString`. Chilkat examines the content and recognizes these textual representations: - PEM public keys. - Unencrypted PEM private keys, from which only the public portion is retained. - Chilkat XML public or private keys. - Public or private JWK. - Standard Base64-encoded DER. - RFC 4716 SSH2 public-key blocks for supported RSA and Ed25519 keys. Hex-encoded DER, Base64url-encoded DER, one-line OpenSSH forms such as `ssh-rsa ...` and `ssh-ed25519 ...`, X.509 certificates, and encrypted private keys are not recognized. For PEM input, UTF-8 BOMs, CRLF or LF line endings, leading and trailing whitespace, unrelated surrounding text, and unrelated PEM blocks are tolerated. If multiple recognized key blocks are present, the first recognized key is loaded. For JWK input, required public members must be present. Private members such as `d` may be present but are discarded. Optional metadata such as `kid`, `use`, `alg`, `key_ops`, and `x5c` is not retained. | Key type | Required public members | | :--- | :--- | | RSA | `kty`, `n`, and a nonzero `e`. | | EC | `kty`, `crv`, `x`, and `y`. | | Ed25519 | `kty`, `crv`, and `x`. | A successful load replaces the current key. A failed load clears this object. **Certificates and encrypted private keys:** Direct X.509 certificate input is not supported. Load a certificate with a `Cert` object and obtain its public key from the certificate. Encrypted private-key input is also not supported by this class; load and decrypt it with a `PrivateKey` object, then obtain the corresponding public key. **Validation scope:** JWK loading validates the required structure and basic values, but it does not prove that supplied EC or Ed25519 public bytes are mathematically valid or trusted. Returns True for success, False for failure. ### PublicKey.SaveDerFile `Chilkat 11.7.0 · dataflex · PublicKey · SaveDerFile · method · since 9.5.0.58` ```dataflex Function ComSaveDerFile Boolean preferPkcs1 String path Returns Boolean ``` Saves the public key to `path` as binary DER. `preferPkcs1` selects the representation using the same RSA, EC, and Ed25519 rules described for `GetDer`. An existing destination file is overwritten. Parent directories are not created automatically. The method fails if `path` names a directory. If this object is empty, the method fails without creating the file. **Windows read-only files:** An existing read-only destination may be replaced; the resulting file is not left with the read-only attribute. Returns True for success, False for failure. ### PublicKey.SavePemFile `Chilkat 11.7.0 · dataflex · PublicKey · SavePemFile · method · since 9.5.0.58` ```dataflex Function ComSavePemFile Boolean preferPkcs1 String path Returns Boolean ``` Saves the public key to `path` in PEM format. `preferPkcs1` selects the representation and PEM label using the same rules described for `GetPem`. The generated file uses CRLF line endings, Base64 body lines of at most 64 characters, and a final CRLF. An existing destination file is overwritten. If this object is empty, the method fails without creating the file. Returns True for success, False for failure. ### PublicKey.SaveXmlFile `Chilkat 11.7.0 · dataflex · PublicKey · SaveXmlFile · method` ```dataflex Function ComSaveXmlFile String path Returns Boolean ``` Saves the public key to the local filesystem path specified by `path` using exactly the same key-type-specific XML text returned by `GetXml`. No additional BOM or line ending is added. An existing destination file is overwritten. If this object is empty, the method fails without creating the destination file. **Choosing a file format:** Use XML when another Chilkat application will read the key. For broader interoperability, PEM or DER is usually a better choice. Returns True for success, False for failure. ## Related classes [`BinData`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/dataflex/classes/BinData.md)