87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
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// SPDX-License-Identifier: MIT
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package srtp
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import "fmt"
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// ProtectionProfile specifies Cipher and AuthTag details, similar to TLS cipher suite
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type ProtectionProfile uint16
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// Supported protection profiles
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// See https://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
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const (
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ProtectionProfileAes128CmHmacSha1_80 ProtectionProfile = 0x0001
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ProtectionProfileAes128CmHmacSha1_32 ProtectionProfile = 0x0002
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ProtectionProfileAeadAes128Gcm ProtectionProfile = 0x0007
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ProtectionProfileAeadAes256Gcm ProtectionProfile = 0x0008
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)
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func (p ProtectionProfile) keyLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80, ProtectionProfileAeadAes128Gcm:
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return 16, nil
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case ProtectionProfileAeadAes256Gcm:
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return 32, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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func (p ProtectionProfile) saltLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
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return 14, nil
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case ProtectionProfileAeadAes128Gcm, ProtectionProfileAeadAes256Gcm:
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return 12, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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func (p ProtectionProfile) rtpAuthTagLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_80:
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return 10, nil
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case ProtectionProfileAes128CmHmacSha1_32:
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return 4, nil
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case ProtectionProfileAeadAes128Gcm, ProtectionProfileAeadAes256Gcm:
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return 0, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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func (p ProtectionProfile) rtcpAuthTagLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
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return 10, nil
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case ProtectionProfileAeadAes128Gcm, ProtectionProfileAeadAes256Gcm:
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return 0, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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func (p ProtectionProfile) aeadAuthTagLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
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return 0, nil
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case ProtectionProfileAeadAes128Gcm, ProtectionProfileAeadAes256Gcm:
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return 16, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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func (p ProtectionProfile) authKeyLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_32, ProtectionProfileAes128CmHmacSha1_80:
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return 20, nil
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case ProtectionProfileAeadAes128Gcm, ProtectionProfileAeadAes256Gcm:
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return 0, nil
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default:
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return 0, fmt.Errorf("%w: %#v", errNoSuchSRTPProfile, p)
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}
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}
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