# P256.Signing.PublicKey A P-256 public key used to verify cryptographic signatures. ``` struct PublicKey ``` ## Topics ### Creating a key [`init(rawRepresentation: D) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(rawRepresentation:)) Creates a P-256 public key for signing from a collection of bytes. [`init(compactRepresentation: Bytes) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(compactRepresentation:)) Creates a P-256 public key for signing from a compact representation of the key. [`init(compressedRepresentation: Bytes) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(compressedRepresentation:)) Creates a P-256 public key for signing from a compressed representation of the key. [`init(derRepresentation: Bytes) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(derRepresentation:)) Creates a P-256 public key for signing from a Distinguished Encoding Rules (DER) encoded representation. [`init(pemRepresentation: String) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(pemRepresentation:)) Creates a P-256 public key for signing from a Privacy-Enhanced Mail (PEM) representation. [`init(x963Representation: Bytes) throws`](/documentation/CryptoKit/P256/Signing/PublicKey/init(x963Representation:)) Creates a P-256 public key for signing from an ANSI x9.63 representation. ### Representing the key [`var rawRepresentation: Data`](/documentation/CryptoKit/P256/Signing/PublicKey/rawRepresentation) A full representation of the public key. [`var compactRepresentation: Data?`](/documentation/CryptoKit/P256/Signing/PublicKey/compactRepresentation) A compact representation of the public key. [`var compressedRepresentation: Data`](/documentation/CryptoKit/P256/Signing/PublicKey/compressedRepresentation) A compressed representation of the public key. [`var derRepresentation: Data`](/documentation/CryptoKit/P256/Signing/PublicKey/derRepresentation) A Distinguished Encoding Rules (DER) encoded representation of the public key. [`var pemRepresentation: String`](/documentation/CryptoKit/P256/Signing/PublicKey/pemRepresentation) A Privacy-Enhanced Mail (PEM) representation of the public key. [`var x963Representation: Data`](/documentation/CryptoKit/P256/Signing/PublicKey/x963Representation) An ANSI x9.63 representation of the public key. ### Verifying a signature [`func isValidSignature(P256.Signing.ECDSASignature, for: D) -> Bool`](/documentation/CryptoKit/P256/Signing/PublicKey/isValidSignature(_:for:)-3da2m) Verifies an elliptic curve digital signature algorithm (ECDSA) signature on a block of data over the P-256 elliptic curve. [`func isValidSignature(P256.Signing.ECDSASignature, for: D) -> Bool`](/documentation/CryptoKit/P256/Signing/PublicKey/isValidSignature(_:for:)-2rsb5) Verifies an elliptic curve digital signature algorithm (ECDSA) signature on a digest over the P-256 elliptic curve. [`struct ECDSASignature`](/documentation/CryptoKit/P256/Signing/ECDSASignature) A P-256 elliptic curve digital signature algorithm (ECDSA) signature. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)