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-rw-r--r--cipher/hash-common.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/cipher/hash-common.c b/cipher/hash-common.c
index ed63a0ba..9a007e12 100644
--- a/cipher/hash-common.c
+++ b/cipher/hash-common.c
@@ -95,7 +95,10 @@ _gcry_hash_selftest_check_one (int algo,
/* Common function to write a chunk of data to the transform function
of a hash algorithm. Note that the use of the term "block" does
- not imply a fixed size block. */
+ not imply a fixed size block. Note that we explicitly allow to use
+ this function after the context has been finalized; the result does
+ not have any meaning but writing after finalize is sometimes
+ helpful to mitigate timing attacks. */
void
_gcry_md_block_write (void *context, const void *inbuf_arg, size_t inlen)
{