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-rw-r--r--sha3.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/sha3.c b/sha3.c
index b6d4f9c..bf754cb 100644
--- a/sha3.c
+++ b/sha3.c
@@ -857,9 +857,14 @@ static inline void xof_init(sha3_xof_t * const xof) {
memset(xof, 0, sizeof(sha3_xof_t));
}
-// absorb by copying internal state and processing in chunks. used by
-// xor_absorb_raw() for longer messages.
-static inline void xof_absorb_raw_bulk(sha3_xof_t * const xof, const size_t rate, const size_t num_rounds, const uint8_t *m, size_t m_len) {
+// absorb large message into context by doing the following:
+//
+// 1. copy context state to local state.
+// 2. absorb message in chunks into local state.
+// 3. copy local state back to context.
+//
+// Called by `xof_absorb_raw()` to absorb large messages.
+static inline void xof_absorb_raw_large(sha3_xof_t * const xof, const size_t rate, const size_t num_rounds, const uint8_t *m, size_t m_len) {
// load state and byte count from context
// TODO: benchmark this to see if it's faster
sha3_state_t a = xof->a;
@@ -930,9 +935,9 @@ static inline void xof_absorb_raw_bulk(sha3_xof_t * const xof, const size_t rate
xof->num_bytes = num_bytes;
}
-// absorb without copying internal state. used by xor_absorb_raw() for
+// absorb small message into context. used by `xor_absorb_raw()` for
// short messages.
-static inline void xof_absorb_raw_simple(sha3_xof_t * const xof, const size_t rate, const size_t num_rounds, const uint8_t *m, size_t m_len) {
+static inline void xof_absorb_raw_small(sha3_xof_t * const xof, const size_t rate, const size_t num_rounds, const uint8_t *m, size_t m_len) {
// load byte count from context
size_t num_bytes = xof->num_bytes;
@@ -952,14 +957,17 @@ static inline void xof_absorb_raw_simple(sha3_xof_t * const xof, const size_t ra
xof->num_bytes = num_bytes;
}
-// absorb w/o checking state (used by xof_once())
+// absorb message into xof context without checking to see if the
+// context has already been squeezed.
+//
+// called by `xof_absorb()` and `xof_once()`.
static inline void xof_absorb_raw(sha3_xof_t * const xof, const size_t rate, const size_t num_rounds, const uint8_t *m, size_t m_len) {
if ((xof->num_bytes & 7) == 0 && m_len > 32) {
- // longer message, absorb in large chunks.
- xof_absorb_raw_bulk(xof, rate, num_rounds, m, m_len);
+ // large message, absorb in chunks.
+ xof_absorb_raw_large(xof, rate, num_rounds, m, m_len);
} else {
- // shorter message, absorb as bytes
- xof_absorb_raw_simple(xof, rate, num_rounds, m, m_len);
+ // short message, absorb as bytes.
+ xof_absorb_raw_small(xof, rate, num_rounds, m, m_len);
}
}