Key Generation For Digital Certificates

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Overview

Cryptographic keys are strings of bytes that you combine with other data in specialized mathematical operations to enhance security. At the lowest level, this usually means participating in either encryption and decryption or digital signing and verification. You can use these basic operations directly, such as when you encrypt data before sending it through an insecure channel. You also use them implicitly, such as when you verify the digital signature on a certificate as a byproduct of a trust evaluation.

What is a private key? All SSL Certificates require a private key to work. The private key is a separate file that’s used in the encryption/decryption of data sent between your server and the connecting clients. A private key is created by you—the certificate owner—when you request your certificate with a Certificate Signing Request (CSR). Digital Certificates Overview, Obtaining a Certificate from a Certificate Authority for an ES PIC, Requesting a CA Digital Certificate for an ES PIC on an M Series or T Series Router, Example: Requesting a CA Digital Certificate, Generating a Private and Public Key Pair for Digital Certificates for an ES PIC. You also use them implicitly, such as when you verify the digital signature on a certificate as a byproduct of a trust evaluation. Keys vary based on the operations they support. For example, you use public and private key pairs to perform asymmetric encryption, whereas you use symmetric keys to conduct symmetric encryption.

Keys vary based on the operations they support. For example, you use public and private key pairs to perform asymmetric encryption, whereas you use symmetric keys to conduct symmetric encryption. Similarly, one key might work for a 1024-bit RSA algorithm, while another might be suitable for a 256-bit elliptic curve algorithm. Use the functions in this section when you need to handle cryptographic keys.

Topics

Getting an Existing Key

Learn how to obtain an existing cryptographic key.

Storing Keys in the Keychain

Store and access cryptographic keys in the keychain.

class SecKey
func SecKeyGetTypeID() -> CFTypeID

Returns the unique identifier of the opaque type to which a key object belongs.

Generating New Cryptographic Keys

Create both asymmetric and symmetric cryptographic keys.

Storing Keys in the Secure Enclave

Create an extra layer of security for your private keys.

func SecKeyCreateRandomKey(CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?
func SecKeyCopyPublicKey(SecKey) -> SecKey?

Gets the public key associated with the given private key.

Key Generation Attributes

Use attribute dictionary keys during cryptographic key generation.

func SecKeyIsAlgorithmSupported(SecKey, SecKeyOperationType, SecKeyAlgorithm) -> Bool

Returns a Boolean indicating whether a key is suitable for an operation using a certain algorithm.

func SecKeyGetBlockSize(SecKey) -> Int

Gets the block length associated with a cryptographic key.

func SecKeyCopyAttributes(SecKey) -> CFDictionary?
struct SecKeyAlgorithm
enum SecKeyOperationType

The types of operations that you can use a cryptographic key to perform.

Storing Keys as Data

Create an external representation of a key for transmission.

func SecKeyCopyExternalRepresentation(SecKey, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

Returns an external representation of the given key suitable for the key's type.

func SecKeyCreateWithData(CFData, CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?

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Restores a key from an external representation of that key.

func SecKeyCopyKeyExchangeResult(SecKey, SecKeyAlgorithm, SecKey, CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

Performs the Diffie-Hellman style of key exchange with optional key-derivation steps.

struct SecKeyKeyExchangeParameter

The dictionary keys used to specify Diffie-Hellman key exchange parameters.

Using Keys for Encryption

Perform asymmetric and symmetric encryption and decryption using cryptographic keys.

func SecKeyCreateEncryptedData(SecKey, SecKeyAlgorithm, CFData, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

Encrypts a block of data using a public key and specified algorithm.

func SecKeyCreateDecryptedData(SecKey, SecKeyAlgorithm, CFData, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

Decrypts a block of data using a private key and specified algorithm.

Signing and Verifying

Create and evaluate digital signatures to establish the validity of code or data.

func SecKeyCreateSignature(SecKey, SecKeyAlgorithm, CFData, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

Creates the cryptographic signature for a block of data using a private key and specified algorithm.

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func SecKeyVerifySignature(SecKey, SecKeyAlgorithm, CFData, CFData, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> Bool

Verifies the cryptographic signature of a block of data using a public key and specified algorithm.

func SecKeyGeneratePair(CFDictionary, UnsafeMutablePointer<SecKey?>?, UnsafeMutablePointer<SecKey?>?) -> OSStatus
func SecKeyEncrypt(SecKey, SecPadding, UnsafePointer<UInt8>, Int, UnsafeMutablePointer<UInt8>, UnsafeMutablePointer<Int>) -> OSStatus
func SecKeyDecrypt(SecKey, SecPadding, UnsafePointer<UInt8>, Int, UnsafeMutablePointer<UInt8>, UnsafeMutablePointer<Int>) -> OSStatus
func SecKeyRawSign(SecKey, SecPadding, UnsafePointer<UInt8>, Int, UnsafeMutablePointer<UInt8>, UnsafeMutablePointer<Int>) -> OSStatus

Generates a digital signature for a block of data.

func SecKeyRawVerify(SecKey, SecPadding, UnsafePointer<UInt8>, Int, UnsafePointer<UInt8>, Int) -> OSStatus
struct SecPadding

The types of padding to use when you create or verify a digital signature.

func SecKeyGeneratePairAsync(CFDictionary, DispatchQueue, SecKeyGeneratePairBlock)
func SecKeyGenerateSymmetric(CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?
func SecKeyCreateFromData(CFDictionary, CFData, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?

Constructs a SecKeyRef object for a symmetric key.

func SecKeyDeriveFromPassword(CFString, CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?

Returns a key object in which the key data is derived from a password.

func SecKeyWrapSymmetric(SecKey, SecKey, CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> CFData?

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func SecKeyUnwrapSymmetric(UnsafeMutablePointer<Unmanaged<CFData>?>, SecKey, CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?
enum SecKeySizes

The supported sizes for keys of various common types.

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struct SecKeyUsage

The flags that indicate key usage in the KeyUsage extension of a certificate.

typealias SecPublicKeyHash

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typealias SecKeyGeneratePairBlock

A block called with the results of a call to SecKeyGeneratePairAsync(_:_:_:).

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enum SecCredentialType

The credential type to be returned by SecKeyGetCredentials.

See Also

Certificate Generation Tool

Certificates
Identities

Age of mythology titans cd key generator. Combine certificates and cryptographic keys into identities.

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