Speed up encoding
Bug: 63928581
Test: atest HadamardTest
Change-Id: I1e37a9559892288f76e69fe81a746b77e2bf7495
diff --git a/rebootescrow/aidl/default/HadamardUtils.h b/rebootescrow/aidl/default/HadamardUtils.h
index 85e635f..e04f7d5 100644
--- a/rebootescrow/aidl/default/HadamardUtils.h
+++ b/rebootescrow/aidl/default/HadamardUtils.h
@@ -31,9 +31,10 @@
constexpr auto CODEWORD_BITS = CODEWORD_BYTES * BYTE_LENGTH;
constexpr uint32_t CODE_K = CODEWORD_BITS - 1;
constexpr uint32_t ENCODE_LENGTH = 1u << CODE_K;
-constexpr auto KEY_CODEWORDS = 16u;
+constexpr auto KEY_CODEWORD_BYTES = 2u; // uint16_t (after transpose)
+constexpr auto KEY_CODEWORDS = KEY_CODEWORD_BYTES * BYTE_LENGTH;
constexpr auto KEY_SIZE_IN_BYTES = KEY_CODEWORDS * CODEWORD_BYTES;
-constexpr auto OUTPUT_SIZE_BYTES = KEY_CODEWORDS * ENCODE_LENGTH / BYTE_LENGTH;
+constexpr auto OUTPUT_SIZE_BYTES = ENCODE_LENGTH * KEY_CODEWORD_BYTES;
// Encodes a key that has a size of KEY_SIZE_IN_BYTES. Returns a byte array representation of the
// encoded bitset. So a 32 bytes key will expand to 16*(2^15) bits = 64KiB.