crypto/hmac-*: Use 'restrict'.

* lib/hmac.h (hmac_md5, hmac_sha1, hmac_sha256, hmac_sha512): Use
'restrict'.
* modules/crypto/hmac-md5 (configure.ac): Require AC_C_RESTRICT.
* modules/crypto/hmac-sha1 (configure.ac): Likewise.
* modules/crypto/hmac-sha256 (configure.ac): Likewise.
* modules/crypto/hmac-sha512 (configure.ac): Likewise.

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/hmac.h b/lib/hmac.h
index a39070221f..135eb2a8b0 100644
--- a/lib/hmac.h
+++ b/lib/hmac.h
@@ -27,7 +27,7 @@
    RESBUF buffer.  Return 0 on success.  */
 int
 hmac_md5 (const void *key, size_t keylen,
-          const void *buffer, size_t buflen, void *resbuf);
+          const void *buffer, size_t buflen, void *restrict resbuf);
 
 /* Compute Hashed Message Authentication Code with SHA-1, over BUFFER
    data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
@@ -35,7 +35,7 @@ hmac_md5 (const void *key, size_t keylen,
    success.  */
 int
 hmac_sha1 (const void *key, size_t keylen,
-           const void *in, size_t inlen, void *resbuf);
+           const void *in, size_t inlen, void *restrict resbuf);
 
 /* Compute Hashed Message Authentication Code with SHA-256, over BUFFER
    data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
@@ -43,7 +43,7 @@ hmac_sha1 (const void *key, size_t keylen,
    success.  */
 int
 hmac_sha256 (const void *key, size_t keylen,
-             const void *in, size_t inlen, void *resbuf);
+             const void *in, size_t inlen, void *restrict resbuf);
 
 /* Compute Hashed Message Authentication Code with SHA-512, over BUFFER
    data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
@@ -51,6 +51,6 @@ hmac_sha256 (const void *key, size_t keylen,
    success.  */
 int
 hmac_sha512 (const void *key, size_t keylen,
-             const void *in, size_t inlen, void *resbuf);
+             const void *in, size_t inlen, void *restrict resbuf);
 
 #endif /* HMAC_H */