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package srtp
import "fmt"
// ProtectionProfile specifies Cipher and AuthTag details, similar to TLS cipher suite
type ProtectionProfile uint16
// Supported protection profiles
const (
ProtectionProfileAes128CmHmacSha1_80 ProtectionProfile = 0x0001
ProtectionProfileAeadAes128Gcm ProtectionProfile = 0x0007
)
func (p ProtectionProfile) keyLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
fallthrough
case ProtectionProfileAeadAes128Gcm:
return 16, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) saltLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
return 14, nil
case ProtectionProfileAeadAes128Gcm:
return 12, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) authTagLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
return (&srtpCipherAesCmHmacSha1{}).authTagLen(), nil
case ProtectionProfileAeadAes128Gcm:
return (&srtpCipherAeadAesGcm{}).authTagLen(), nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) aeadAuthTagLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
return (&srtpCipherAesCmHmacSha1{}).aeadAuthTagLen(), nil
case ProtectionProfileAeadAes128Gcm:
return (&srtpCipherAeadAesGcm{}).aeadAuthTagLen(), nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) authKeyLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
return 20, nil
case ProtectionProfileAeadAes128Gcm:
return 0, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
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