From 5af9e6219646ace094cfe35caa0125cbff8f38f8 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Sun, 18 Mar 2012 17:03:58 +0000
Subject: [rng] Add Linux entropy source using /dev/random

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/include/ipxe/entropy.h             |  1 +
 src/include/ipxe/errfile.h             |  1 +
 src/include/ipxe/linux/linux_entropy.h | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 src/include/ipxe/linux/linux_entropy.h

(limited to 'src/include')

diff --git a/src/include/ipxe/entropy.h b/src/include/ipxe/entropy.h
index 50ba4fc63..adf325e79 100644
--- a/src/include/ipxe/entropy.h
+++ b/src/include/ipxe/entropy.h
@@ -54,6 +54,7 @@ typedef uint8_t entropy_sample_t;
 
 /* Include all architecture-independent entropy API headers */
 #include <ipxe/null_entropy.h>
+#include <ipxe/linux/linux_entropy.h>
 
 /* Include all architecture-dependent entropy API headers */
 #include <bits/entropy.h>
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index 050bf3fec..bfb738a4a 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -247,6 +247,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define ERRFILE_drbg		      ( ERRFILE_OTHER | 0x00250000 )
 #define ERRFILE_entropy		      ( ERRFILE_OTHER | 0x00260000 )
 #define ERRFILE_rsa		      ( ERRFILE_OTHER | 0x00270000 )
+#define ERRFILE_linux_entropy	      ( ERRFILE_OTHER | 0x00280000 )
 
 /** @} */
 
diff --git a/src/include/ipxe/linux/linux_entropy.h b/src/include/ipxe/linux/linux_entropy.h
new file mode 100644
index 000000000..bd89bd52f
--- /dev/null
+++ b/src/include/ipxe/linux/linux_entropy.h
@@ -0,0 +1,32 @@
+#ifndef _IPXE_LINUX_ENTROPY_H
+#define _IPXE_LINUX_ENTROPY_H
+
+/** @file
+ *
+ * iPXE entropy API for linux
+ *
+ */
+
+FILE_LICENCE(GPL2_OR_LATER);
+
+#ifdef ENTROPY_LINUX
+#define ENTROPY_PREFIX_linux
+#else
+#define ENTROPY_PREFIX_linux __linux_
+#endif
+
+/**
+ * min-entropy per sample
+ *
+ * @ret min_entropy	min-entropy of each sample
+ */
+static inline __always_inline double
+ENTROPY_INLINE ( linux, min_entropy_per_sample ) ( void ) {
+
+	/* We read single bytes from /dev/random and assume that each
+	 * contains full entropy.
+	 */
+	return 8;
+}
+
+#endif /* _IPXE_LINUX_ENTROPY_H */
-- 
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