StatefulMem* functions should be library functions.

src/platform/vboot_reference/vboot_firmware/lib/cryptolib/sha2.c

 /* SHA-256 and SHA-512 implementation based on code by Oliver Gay
  * <olivier.gay@a3.epfl.ch> under a BSD-style license. See below.
  */
 
 /*
  * FIPS 180-2 SHA-224/256/384/512 implementation
  * Last update: 02/02/2007
  * Issue date:  04/30/2005
  *
  * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
@@ skipping 360 matching lines @@
 #ifndef UNROLL_LOOPS
     int i;
 #endif
 
     block_nb = (1 + ((SHA256_BLOCK_SIZE - 9)
                      < (ctx->len % SHA256_BLOCK_SIZE)));
 
     len_b = (ctx->tot_len + ctx->len) << 3;
     pm_len = block_nb << 6;
 
-    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
+    Memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
     ctx->block[ctx->len] = 0x80;
     UNPACK32(len_b, ctx->block + pm_len - 4);
 
     SHA256_transform(ctx, ctx->block, block_nb);
 
 #ifndef UNROLL_LOOPS
     for (i = 0 ; i < 8; i++) {
         UNPACK32(ctx->h[i], &ctx->buf[i << 2]);
     }
 #else
@@ skipping 169 matching lines @@
 #ifndef UNROLL_LOOPS
     int i;
 #endif
 
     block_nb = 1 + ((SHA512_BLOCK_SIZE - 17)
                      < (ctx->len % SHA512_BLOCK_SIZE));
 
     len_b = (ctx->tot_len + ctx->len) << 3;
     pm_len = block_nb << 7;
 
-    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
+    Memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
     ctx->block[ctx->len] = 0x80;
     UNPACK32(len_b, ctx->block + pm_len - 4);
 
     SHA512_transform(ctx, ctx->block, block_nb);
 
 #ifndef UNROLL_LOOPS
     for (i = 0 ; i < 8; i++) {
         UNPACK64(ctx->h[i], &ctx->buf[i << 3]);
     }
 #else
@@ skipping 32 matching lines @@
   int i;
   SHA512_CTX ctx;
   SHA512_init(&ctx);
   SHA512_update(&ctx, data, len);
   p = SHA512_final(&ctx);
   for (i = 0; i < SHA512_DIGEST_SIZE; ++i) {
     digest[i] = *p++;
   }
   return digest;
 }