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v4_payloads.go
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/
v4_payloads.go
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package paseto
type v4PublicPayload struct {
message []byte
signature [64]byte
}
func (p v4PublicPayload) bytes() []byte {
return append(p.message, p.signature[:]...)
}
func newV4PublicPayload(bytes []byte) (v4PublicPayload, error) {
signatureOffset := len(bytes) - 64
if signatureOffset < 0 {
return v4PublicPayload{}, errorPayloadShort
}
message := make([]byte, len(bytes)-64)
copy(message, bytes[:signatureOffset])
var signature [64]byte
copy(signature[:], bytes[signatureOffset:])
return v4PublicPayload{message, signature}, nil
}
type v4LocalPayload struct {
nonce [32]byte
cipherText []byte
tag [32]byte
}
func (p v4LocalPayload) bytes() []byte {
return append(append(p.nonce[:], p.cipherText...), p.tag[:]...)
}
func newV4LocalPayload(bytes []byte) (v4LocalPayload, error) {
if len(bytes) <= 32+32 {
return v4LocalPayload{}, errorPayloadShort
}
macOffset := len(bytes) - 32
var nonce [32]byte
copy(nonce[:], bytes[0:32])
cipherText := make([]byte, macOffset-32)
copy(cipherText, bytes[32:macOffset])
var tag [32]byte
copy(tag[:], bytes[macOffset:])
return v4LocalPayload{nonce, cipherText, tag}, nil
}