1 files changed, 27 insertions, 0 deletions
diff --git a/src/libstdcrypto/blake2s_update.c b/src/libstdcrypto/blake2s_update.c
new file mode 100644
index 0000000..bf0639b
--- /dev/null
+++ b/src/libstdcrypto/blake2s_update.c
@@ -0,0 +1,27 @@
+ /* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/blake2s.h>
+#include "blake2s-internal.h"
+
+void blake2s_update (blake2s_ctx *ctx, char const *s, size_t len)
+{
+  size_t w = 64 - ctx->buflen ;
+  if (!len) return ;
+  if (len > w)
+  {
+    memcpy(ctx->buf + ctx->buflen, s, w) ;
+    blake2s_transform(ctx, ctx->buf, 1, 64) ;
+    ctx->buflen = 0 ;
+    s += w ; len -= w ;
+  }
+  if (len > 64)
+  {
+    size_t n = (len+63)/64 - 1 ;
+    blake2s_transform(ctx, s, n, 64) ;
+    n <<= 6 ; s += n ; len -= n ;
+  }
+  memcpy(ctx->buf + ctx->buflen, s, len) ;
+  ctx->buflen += len ;
+}