[PATCH v16 21/38] lib/crypto: Add SHA1 support for pre-boot environments

[Ross Philipson]

Allow the SHA1 library code in lib/crypto/sha1.c to be used in
pre-boot environments. Use the __DISABLE_EXPORTS macro to disable
function exports and define the proper values for that environment
as was done earlier for SHA256.

Acked-by: Eric Biggers <ebiggers at kernel.org>
Signed-off-by: Ross Philipson <ross.philipson at gmail.com>
---
 lib/crypto/sha1.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/crypto/sha1.c b/lib/crypto/sha1.c
index daf18c862fdf..f30b5ff3b31e 100644
--- a/lib/crypto/sha1.c
+++ b/lib/crypto/sha1.c
@@ -125,7 +125,7 @@ static void __maybe_unused sha1_blocks_generic(struct sha1_block_state *state,
 	memzero_explicit(workspace, sizeof(workspace));
 }
 
-#ifdef CONFIG_CRYPTO_LIB_SHA1_ARCH
+#if defined(CONFIG_CRYPTO_LIB_SHA1_ARCH) && !defined(__DISABLE_EXPORTS)
 #include "sha1.h" /* $(SRCARCH)/sha1.h */
 #else
 #define sha1_blocks sha1_blocks_generic
@@ -207,6 +207,12 @@ void sha1(const u8 *data, size_t len, u8 out[SHA1_DIGEST_SIZE])
 }
 EXPORT_SYMBOL_GPL(sha1);
 
+/*
+ * Pre-boot environments (as indicated by __DISABLE_EXPORTS being defined)
+ * don't need the SHA1 HMAC support code.
+ */
+#ifndef __DISABLE_EXPORTS
+
 static void __hmac_sha1_preparekey(struct sha1_block_state *istate,
 				   struct sha1_block_state *ostate,
 				   const u8 *raw_key, size_t raw_key_len)
@@ -302,6 +308,8 @@ void hmac_sha1_usingrawkey(const u8 *raw_key, size_t raw_key_len,
 }
 EXPORT_SYMBOL_GPL(hmac_sha1_usingrawkey);
 
+#endif /* !__DISABLE_EXPORTS */
+
 #if defined(sha1_mod_init_arch) || defined(CONFIG_CRYPTO_FIPS)
 static int __init sha1_mod_init(void)
 {
-- 
2.47.3