entity

type Claim struct {
	Age            int    `json:"age"`
	UniversityName string `json:"universityName"`
	Degree         string `json:"degree"`
}

type Credential struct {
	CredentialToSign

	Proof Proof `json:"proof"`
}

type CredentialSubject struct {
	ID    []byte `json:"id"`
	Claim Claim  `json:"claim"`
}

type CredentialToSign struct {
	Context           []string          `json:"context"`
	TypeOfCredential  []string          `json:"type"`
	IssuanceDate      time.Time         `json:"issuanceDate"`
	CredentialSubject CredentialSubject `json:"credentialSubject"`
}

type KeyPair struct {
	PublicKey  crypto.PublicKey
	PrivateKey crypto.PrivateKey
}

type Presentation struct {
	PresentationToSign

	Proof Proof `json:"proof"`
}

type PresentationToSign struct {
	Context            []string   `json:"context"`
	TypeOfPresentation []string   `json:"type"`
	Credential         Credential `json:"credential"`
	Nonce              []byte     `json:"nonce"`
}

type Proof struct {
	TypeOfProof string           `json:"type"`
	Created     time.Time        `json:"created"`
	Creator     crypto.PublicKey `json:"creator"`
	Signature   []byte           `json:"signature"`
}

type RawSignature struct {
	R, S *big.Int
}