Use CHROMEOS_EC macro to cut down compiled size.release-R20-2268.Bfactory-2268.16.B

This macro is only defined by the EC firmware build process, and is used to
cut down the amount of compiled code. A future CL will refactor the library
to make this unnecessary.

BUG=chrome-os-partner:7459
TEST=manual

  make
  make runtests

Change-Id: I41d0b4b282ec7147e8d6f508531af32e74f2d19e
Reviewed-on: https://gerrit.chromium.org/gerrit/22313
Commit-Ready: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Tested-by: Bill Richardson <wfrichar@chromium.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/firmware/lib/cryptolib/sha_utility.c b/firmware/lib/cryptolib/sha_utility.c
index bec7209c..c676040b 100644
--- a/firmware/lib/cryptolib/sha_utility.c
+++ b/firmware/lib/cryptolib/sha_utility.c
@@ -12,53 +12,65 @@
 void DigestInit(DigestContext* ctx, int sig_algorithm) {
   ctx->algorithm = hash_type_map[sig_algorithm];
   switch(ctx->algorithm) {
+#ifndef CHROMEOS_EC
     case SHA1_DIGEST_ALGORITHM:
       ctx->sha1_ctx = (SHA1_CTX*) VbExMalloc(sizeof(SHA1_CTX));
       SHA1_init(ctx->sha1_ctx);
       break;
+#endif
     case SHA256_DIGEST_ALGORITHM:
       ctx->sha256_ctx = (SHA256_CTX*) VbExMalloc(sizeof(SHA256_CTX));
       SHA256_init(ctx->sha256_ctx);
       break;
+#ifndef CHROMEOS_EC
     case SHA512_DIGEST_ALGORITHM:
       ctx->sha512_ctx = (SHA512_CTX*) VbExMalloc(sizeof(SHA512_CTX));
       SHA512_init(ctx->sha512_ctx);
       break;
+#endif
   };
 }
 
 void DigestUpdate(DigestContext* ctx, const uint8_t* data, uint32_t len) {
   switch(ctx->algorithm) {
+#ifndef CHROMEOS_EC
     case SHA1_DIGEST_ALGORITHM:
       SHA1_update(ctx->sha1_ctx, data, len);
       break;
+#endif
     case SHA256_DIGEST_ALGORITHM:
       SHA256_update(ctx->sha256_ctx, data, len);
       break;
+#ifndef CHROMEOS_EC
     case SHA512_DIGEST_ALGORITHM:
       SHA512_update(ctx->sha512_ctx, data, len);
       break;
+#endif
   };
 }
 
 uint8_t* DigestFinal(DigestContext* ctx) {
   uint8_t* digest = NULL;
   switch(ctx->algorithm) {
+#ifndef CHROMEOS_EC
     case SHA1_DIGEST_ALGORITHM:
       digest = (uint8_t*) VbExMalloc(SHA1_DIGEST_SIZE);
       Memcpy(digest, SHA1_final(ctx->sha1_ctx), SHA1_DIGEST_SIZE);
       VbExFree(ctx->sha1_ctx);
       break;
+#endif
     case SHA256_DIGEST_ALGORITHM:
       digest = (uint8_t*) VbExMalloc(SHA256_DIGEST_SIZE);
       Memcpy(digest, SHA256_final(ctx->sha256_ctx), SHA256_DIGEST_SIZE);
       VbExFree(ctx->sha256_ctx);
       break;
+#ifndef CHROMEOS_EC
     case SHA512_DIGEST_ALGORITHM:
       digest = (uint8_t*) VbExMalloc(SHA512_DIGEST_SIZE);
       Memcpy(digest, SHA512_final(ctx->sha512_ctx), SHA512_DIGEST_SIZE);
       VbExFree(ctx->sha512_ctx);
       break;
+#endif
   };
   return digest;
 }
@@ -71,6 +83,20 @@ uint8_t* DigestBuf(const uint8_t* buf, uint64_t len, int sig_algorithm) {
    */
   typedef uint8_t* (*Hash_ptr) (const uint8_t*, uint64_t, uint8_t*);
   Hash_ptr hash[] = {
+#ifdef CHROMEOS_EC
+    0,  /* RSA 1024 */
+    0,
+    0,
+    0,  /* RSA 2048 */
+    0,
+    0,
+    0,  /* RSA 4096 */
+    SHA256,
+    0,
+    0,  /* RSA 8192 */
+    0,
+    0,
+#else
     SHA1,  /* RSA 1024 */
     SHA256,
     SHA512,
@@ -83,6 +109,7 @@ uint8_t* DigestBuf(const uint8_t* buf, uint64_t len, int sig_algorithm) {
     SHA1,  /* RSA 8192 */
     SHA256,
     SHA512,
+#endif
   };
   /* Call the appropriate hash function. */
   return hash[sig_algorithm](buf, len, digest);