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Encode customization string bit-length instead of byte length, for Ascon-CXOF128 #28

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Merged
itzmeanjan merged 1 commit into from
Jan 28, 2025
Merged

Encode customization string bit-length instead of byte length, for Ascon-CXOF128 #28

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8 changes: 5 additions & 3 deletions include/ascon/hashes/ascon_cxof128.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -53,10 +53,12 @@ struct ascon_cxof128_t
forceinline constexpr bool customize(std::span<const uint8_t> cust_str)
{
if (!has_customized && (cust_str.size() <= CUSTOMIZATION_STRING_MAX_BYTE_LEN)) [[likely]] {
std::array<uint8_t, ascon_sponge_mode::RATE_BYTES> cust_str_len_as_bytes{};
ascon_common_utils::to_le_bytes(cust_str.size(), cust_str_len_as_bytes);
const size_t cust_str_bit_len = cust_str.size() * std::numeric_limits<uint8_t>::digits;

ascon_sponge_mode::absorb(state, offset, cust_str_len_as_bytes);
std::array<uint8_t, ascon_sponge_mode::RATE_BYTES> cust_str_bit_len_as_bytes{};
ascon_common_utils::to_le_bytes(cust_str_bit_len, cust_str_bit_len_as_bytes);

ascon_sponge_mode::absorb(state, offset, cust_str_bit_len_as_bytes);
ascon_sponge_mode::absorb(state, offset, cust_str);
ascon_sponge_mode::finalize(state, offset);

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