XIP1111H from Xiphera is a high-throughpout Intellectual Property (IP) core implementing
the Advanced Encryption Standard (AES) in Galois Counter Mode (GCM). AES-GCM is a widely used cryptographic algorithm for Authenticated Enryption with Associated Data (AEAD) purposes, as it provides both data confidentiality and authenticity.
XIP1111H has been designed for easy integration with FPGA- and ASIC-based designs in a vendor-agnostic design methodology, and the functionality of XIP1111H does not rely on any FPGA manufacturer-specific features.
The main functionality of XIP1111H depends on the mode of operation. When XIP1111H operates in the encryption and authentication tag calculation mode, it encrypts the incoming plaintext blocks into ciphertext blocks, and in addition to this also calculates a 128 bits long authentication tag from both the incoming plaintext and associated data.
When XIP1111H operates in the decryption and tag validity cheching mode, it decrypts the incoming ciphertext blocks into plaintext blocks, and validates the received authentication tag value by calculating the tag from the incoming ciphertext and associated data blocks and comparing the resulting tag value with the received tag value. As defined by the GCM mode of operation, associated data is included in the authentication tag calculation.
XIP1111H can also operate with zero-length associated data, meaning that XIP1111H treats all signals on the input data_in as plaintext to be encrypted or as ciphertext to be decrypted. XIP1111H can also operate with zero-length plaintext or ciphertext, in which case it acts only as an authenticator or authentication validity checker.
XIP1111H outputs first the associated data, followed by encrypted plaintext or decrypted ciphertext (depending on the mode of operation), and as the last output the tag value and associated status signals.
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Figure 1: Internal high-level block diagram of XIP1111H.
 As is typical for AEAD algorithms, the highest throughput is achieved for long messages.
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