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crypto/ChaCha20_Poly1305_64/doc/notes2.md
Byron Lathi cedec1ed1f Add new poly1305 stage
I highly doubt this will pass timing... need to make a test harness to synthesize
2026-07-12 22:13:53 -07:00

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# Requirements
* 2 Gbps operation
* Handles both encrypt and decrypt
At reasonable FPGA speed of 250MHz, 2 Gbps requires a minimum width of 8 bits.
32 bits is a reasonable data width that would be common to see, and lets us
have more breathing room while still maintaining line rate.
Module inputs and outputs
* clk
* rst
* data_in [31:0]
* data_valid
* data_ready
* data_last
* r [127:0]
* s [127:0]
* mac [127:0]
* mac_valid
There is no output backpressure. since the result is just a single 128 bit number,
we don't need to have a ready signal. if you want to add backpressure, add a register
slice on the output outside of this module.