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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
// See https://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
const (
ProtectionProfileAes128CmHmacSha1_80 ProtectionProfile = 0x0001
ProtectionProfileAes128CmHmacSha1_32 ProtectionProfile = 0x0002
ProtectionProfileAeadAes128Gcm ProtectionProfile = 0x0007
)
func (p ProtectionProfile) keyLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80, ProtectionProfileAeadAes128Gcm:
return 16, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) saltLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
return 14, nil
case ProtectionProfileAeadAes128Gcm:
return 12, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) rtpAuthTagLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_80:
return 10, nil
case ProtectionProfileAes128CmHmacSha1_32:
return 4, nil
case ProtectionProfileAeadAes128Gcm:
return 0, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) rtcpAuthTagLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
return 10, nil
case ProtectionProfileAeadAes128Gcm:
return 0, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) aeadAuthTagLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
return 0, nil
case ProtectionProfileAeadAes128Gcm:
return 16, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
func (p ProtectionProfile) authKeyLen() (int, error) {
switch p {
case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
return 20, nil
case ProtectionProfileAeadAes128Gcm:
return 0, nil
default:
return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
}
}
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