High bandwidth encryption engines in a multipathing IP network
Techniques for generating a per-packet initialization vector for high bandwidth encryption engines in a multipathing IP network are described herein. In examples, a network switch of a first datacenter site may receive a data packet to be sent to a second datacenter site over a network. The data packet may be encrypted according to a virtual extensible LAN (VxLAN) protocol and to be transmitted in a VxLAN tunnel created for the first datacenter site and the second datacenter site. An encryption engine implemented at the network switch may generate an initialization vector (IV) for the data packet based on a packet number (PN) associated with the data packet. The encryption engine may use the IV and information associated with a security association (SA) assigned to the packet to encrypt the data packet. In some examples, a full 64-bit PN may be used to compute the IV for the data packet.
1. A method comprising:
receiving, at a first device, a packet to be sent, over a network and in an encrypted tunnel, to a second device;
generating, at the first device, an initialization vector (IV) for the packet based at least in part on a packet number (PN) associated with the packet;
constructing, at the first device, a security header based at least in part on the PN;
encrypting, at the first device, the packet based at least in part on the IV and information associated with a security association (SA) assigned to the packet to generate an encrypted packet, including:
replacing, at the first device, user data in the packet with encrypted user data,
inserting, at the first device, an integrity checksum value (ICV) into the packet, and
inserting, at the first device, the security header into the packet; and
transmitting, from the first device, the encrypted packet to the second device in the encrypted tunnel over the network.
2. The method of claim 1 , wherein the PN is represented in a length of 64 bits, and the method further comprises:
generating, at the first device, the IV for the packet using the 64 bits.
3. The method of claim 1 , further comprising:
obtaining, from a database, the SA assigned to the packet, wherein the information associated with the SA includes the PN, a security association key (SAK), a security channel identifier (SCI), and an association number (AN).
4. The method of claim 3 , further comprising:
constructing, at the first device, the security header to include at least the PN, the SCI and the AN.
5. The method of claim 1 , further comprising:
generating, at the first device, the ICV based on the IV.
6. The method of claim 3 , further comprising:
encrypting, at the first device, the user data of the packet based at least in part on the IV, the SAK, and the SCI to generate the encrypted user data.
7. The method of claim 1 , further comprising:
incrementing, at the first device, the PN by one to generate a second PN; and
updating, at the first device, the SA to include the second PN.
8. The method of claim 1 , wherein the packet is encapsulated using a virtual extensible local area network (VxLAN) overlay protocol.
9. A first device comprising:
a processor; and
a non-transitory computer-readable media storing instructions that, when executed by the processor, cause the processor to perform operations including:
receiving a packet to be sent, over a network and in an encrypted tunnel, to a second device;
generating an initialization vector (IV) for the packet based at least in part on a packet number (PN) associated with the packet;
constructing a security header to include at least the PN;
encrypting the packet based at least in part on the IV and information associated with a security association (SA) assigned to the packet to generate an encrypted packet, including:
replacing user data in the packet with encrypted user data,
inserting an integrity checksum value (ICV) into the packet, and
inserting the security header into the packet; and
transmitting, over the network and in the encrypted tunnel, the encrypted packet to the second device.
10. The first device of claim 9 , wherein the PN is represented in a length of 64 bits, and the operations further comprise:
generating the IV for the packet using the 64 bits.
11. The first device of claim 9 , wherein the operations further comprise:
obtaining, from a database, the SA assigned to the packet, wherein the information associated with the SA includes the PN, a security association key (SAK), a security channel identifier (SCI), and an association number (AN).
12. The first device of claim 11 , wherein the operations further comprise:
constructing the security header to further include at least the SCI and the AN.
13. The first device of claim 9 , wherein the operations further comprise:
generating the ICV based at least in part on the IV.
14. The first device of claim 11 , wherein the encrypting comprises:
encrypting, at the first device, the user data of the packet based at least in part on the IV, the SAK, and the SCI to generate the encrypted user data.
15. The first device of claim 9 , wherein the operations further comprise:
incrementing the PN by one to generate a second PN; and
updating the SA to include the second PN.
16. The first device of claim 9 , the packet is encapsulated using a virtual extensible local area network (VxLAN) overlay protocol.
17. A second device comprising:
a processor; and
a non-transitory computer-readable media storing instructions that, when executed by the processor, cause the processor to perform operations including:
receiving, over a network and via an encrypted tunnel, a packet from a first device;
retrieving a packet number (PN) associated with the packet from a security header of the packet;
generating a first integrity checksum value (ICV) based at least in part on the PN;
performing an integrity check for the packet by comparing the first ICV with a second ICV in the packet;
in response to the packet passing the integrity check, decrypting the packet based at least in part on information associated with a security association (SA) assigned to the packet to generate a decrypted packet, including:
replacing user data in the packet with decrypted user data, and
removing the security header and the second ICV from the packet; and
transmitting, over the network, the decrypted packet to a destination device.
18. The second device of claim 17 , wherein the PN is in a length of 64 bits, and the operations further comprise:
using the PN as is for an initialization vector (IV) for the packet;
obtaining, from the database, the SA assigned to the packet, wherein the information associated with the SA includes at least a security association key (SAK);
retrieving a security channel identifier (SCI) from the security header; and
generating the first ICV based at least in part on the IV, the SAK, the SCI, and user data of the packet.
19. The second device of claim 18 , wherein the decrypting comprises:
decrypting the user data of the packet based at least in part on the IV, the SAK, and the SCI.
20. The second device of claim 17 , wherein the encrypted tunnel is a virtual extensible local area network (VxLAN) tunnel.