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[hmac, rtl] Do not skip padding after a hash stop command #25590

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merged 1 commit into from
Dec 20, 2024
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[hmac, rtl] Do not skip padding after a hash stop command #25590

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9 changes: 7 additions & 2 deletions hw/ip/prim/rtl/prim_sha2_pad.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -337,8 +337,13 @@ module prim_sha2_pad import prim_sha2_pkg::*;
end
endcase

if (!sha_en_i) st_d = StIdle;
else if (hash_go) st_d = StFifoReceive;
if (!sha_en_i) begin
st_d = StIdle;
// We do not allow the cancellation of an ongoing padding operation, i.e., reverting back to the
// `StFifoReceive` state while being in the states `StPad80`, `StPad00`, `StLenHi` or `StLenLo`.
end else if (hash_go && (st_q inside {StIdle, StFifoReceive})) begin
st_d = StFifoReceive;
end
end

// tx_count
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