PsaSignMessage

Sign a message with a private key. Opcode: 24 (0x0018)

Parameters

Name	Type	Description
`key_name`	String	Name of the key to use for the operation
`alg`	`AsymmetricSignature`	An asymmetric signature algorithm that separates the message and sign operations that is compatible with the type of key
`message`	Vector of bytes	The message to sign

key_name must be the name of an asymmetric key pair. The key must allow the usage flag sign_message.

Name	Type	Description
`signature`	Vector of bytes	Buffer containing the signature

PsaErrorNotPermitted: The key does not have the sign_message flag, or it does not permit the requested algorithm.

This function will sign a message with a private key. For hash-and-sign algorithms, this includes the hashing step.