4 files changed, 4 insertions, 4 deletions
diff --git a/Modules/_blake2/impl/blake2b-ref.c b/Modules/_blake2/impl/blake2b-ref.c
index ec775b4d4b..ab375a499c 100644
--- a/Modules/_blake2/impl/blake2b-ref.c
+++ b/Modules/_blake2/impl/blake2b-ref.c
@@ -334,7 +334,7 @@ int blake2b_final( blake2b_state *S, uint8_t *out, uint8_t outlen )
     blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
     blake2b_compress( S, S->buf );
     S->buflen -= BLAKE2B_BLOCKBYTES;
-    memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
+    memmove( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
   }
 
   blake2b_increment_counter( S, S->buflen );
diff --git a/Modules/_blake2/impl/blake2b.c b/Modules/_blake2/impl/blake2b.c
index 58c79fa848..ebb65bb139 100644
--- a/Modules/_blake2/impl/blake2b.c
+++ b/Modules/_blake2/impl/blake2b.c
@@ -371,7 +371,7 @@ int blake2b_final( blake2b_state *S, uint8_t *out, uint8_t outlen )
     blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
     blake2b_compress( S, S->buf );
     S->buflen -= BLAKE2B_BLOCKBYTES;
-    memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
+    memmove( S->buf, S->buf + BLAKE2B_BLOCKBYTES, S->buflen );
   }
 
   blake2b_increment_counter( S, S->buflen );
diff --git a/Modules/_blake2/impl/blake2s-ref.c b/Modules/_blake2/impl/blake2s-ref.c
index b08e72b737..6636753bf4 100644
--- a/Modules/_blake2/impl/blake2s-ref.c
+++ b/Modules/_blake2/impl/blake2s-ref.c
@@ -325,7 +325,7 @@ int blake2s_final( blake2s_state *S, uint8_t *out, uint8_t outlen )
     blake2s_increment_counter( S, BLAKE2S_BLOCKBYTES );
     blake2s_compress( S, S->buf );
     S->buflen -= BLAKE2S_BLOCKBYTES;
-    memcpy( S->buf, S->buf + BLAKE2S_BLOCKBYTES, S->buflen );
+    memmove( S->buf, S->buf + BLAKE2S_BLOCKBYTES, S->buflen );
   }
 
   blake2s_increment_counter( S, ( uint32_t )S->buflen );
diff --git a/Modules/_blake2/impl/blake2s.c b/Modules/_blake2/impl/blake2s.c
index ccad66266b..69385dcc38 100644
--- a/Modules/_blake2/impl/blake2s.c
+++ b/Modules/_blake2/impl/blake2s.c
@@ -348,7 +348,7 @@ int blake2s_final( blake2s_state *S, uint8_t *out, uint8_t outlen )
     blake2s_increment_counter( S, BLAKE2S_BLOCKBYTES );
     blake2s_compress( S, S->buf );
     S->buflen -= BLAKE2S_BLOCKBYTES;
-    memcpy( S->buf, S->buf + BLAKE2S_BLOCKBYTES, S->buflen );
+    memmove( S->buf, S->buf + BLAKE2S_BLOCKBYTES, S->buflen );
   }
 
   blake2s_increment_counter( S, ( uint32_t )S->buflen );