68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
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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const (
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ProtectionProfileAes128CmHmacSha1_80 ProtectionProfile = 0x0001
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ProtectionProfileAeadAes128Gcm ProtectionProfile = 0x0007
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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_80:
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fallthrough
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case ProtectionProfileAeadAes128Gcm:
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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) saltLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_80:
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return 14, nil
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case ProtectionProfileAeadAes128Gcm:
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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) authTagLen() (int, error) {
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switch p {
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case ProtectionProfileAes128CmHmacSha1_80:
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return (&srtpCipherAesCmHmacSha1{}).authTagLen(), nil
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case ProtectionProfileAeadAes128Gcm:
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return (&srtpCipherAeadAesGcm{}).authTagLen(), 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_80:
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return (&srtpCipherAesCmHmacSha1{}).aeadAuthTagLen(), nil
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case ProtectionProfileAeadAes128Gcm:
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return (&srtpCipherAeadAesGcm{}).aeadAuthTagLen(), 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_80:
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return 20, nil
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case ProtectionProfileAeadAes128Gcm:
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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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