X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=src%2Fconfig.h;h=94627a23c0388c58ea9111b83ca9dafb7fc28978;hp=c315a53a884395eb8d70841c5facb4ca01442e01;hb=dda1f8a0c46e15b4a235163470ff700b2f13dcc5;hpb=90bc9406c31e03d09b3d835c3cbabfec83f4e94d

diff --git a/src/config.h b/src/config.h
index c315a53..94627a2 100644
--- a/src/config.h
+++ b/src/config.h
@@ -98,9 +98,38 @@
 #define BR_NO_ARITH_SHIFT   1
  */
 
+/*
+ * When BR_RDRAND is enabled, the SSL engine will use the RDRAND opcode
+ * to automatically obtain quality randomness for seeding its internal
+ * PRNG. Since that opcode is present only in recent x86 CPU, its
+ * support is dynamically tested; if the current CPU does not support
+ * it, then another random source will be used, such as /dev/urandom or
+ * CryptGenRandom().
+ *
+#define BR_RDRAND   1
+ */
+
+/*
+ * When BR_USE_GETENTROPY is enabled, the SSL engine will use the
+ * getentropy() function to obtain quality randomness for seeding its
+ * internal PRNG. On Linux and FreeBSD, getentropy() is implemented by
+ * the standard library with the system call getrandom(); on OpenBSD,
+ * getentropy() is the system call, and there is no getrandom() wrapper,
+ * hence the use of the getentropy() function for maximum portability.
+ *
+ * If the getentropy() call fails, and BR_USE_URANDOM is not explicitly
+ * disabled, then /dev/urandom will be used as a fallback mechanism. On
+ * FreeBSD and OpenBSD, this does not change much, since /dev/urandom
+ * will block if not enough entropy has been obtained since last boot.
+ * On Linux, /dev/urandom might not block, which can be troublesome in
+ * early boot stages, which is why getentropy() is preferred.
+ *
+#define BR_USE_GETENTROPY   1
+ */
+
 /*
  * When BR_USE_URANDOM is enabled, the SSL engine will use /dev/urandom
- * to automatically obtain quality randomness for seedings its internal
+ * to automatically obtain quality randomness for seeding its internal
  * PRNG.
  *
 #define BR_USE_URANDOM   1
@@ -109,7 +138,7 @@
 /*
  * When BR_USE_WIN32_RAND is enabled, the SSL engine will use the Win32
  * (CryptoAPI) functions (CryptAcquireContext(), CryptGenRandom()...) to
- * automatically obtain quality randomness for seedings its internal PRNG.
+ * automatically obtain quality randomness for seeding its internal PRNG.
  *
  * Note: if both BR_USE_URANDOM and BR_USE_WIN32_RAND are defined, the
  * former takes precedence.
@@ -162,6 +191,16 @@
 #define BR_AES_X86NI   1
  */
 
+/*
+ * When BR_SSE2 is enabled, SSE2 intrinsics will be used for some
+ * algorithm implementations that use them (e.g. chacha20_sse2). If this
+ * is not enabled explicitly, then support for SSE2 intrinsics will be
+ * automatically detected. If set explicitly to 0, then SSE2 code will
+ * not be compiled at all.
+ *
+#define BR_SSE2   1
+ */
+
 /*
  * When BR_POWER8 is enabled, the AES implementation using the POWER ISA
  * 2.07 opcodes (available on POWER8 processors and later) is compiled.
@@ -199,7 +238,7 @@
 
 /*
  * When BR_BE_UNALIGNED is enabled, then the current architecture is
- * assumed to use little-endian encoding for integers, and to tolerate
+ * assumed to use big-endian encoding for integers, and to tolerate
  * unaligned accesses with no or minimal time penalty.
  *
 #define BR_BE_UNALIGNED   1