Update to latest BearSSL code. (#5669)

Author: earlephilhower

Diff for: tools/sdk/include/bearssl/bearssl_ec.h

@@ -451,6 +451,42 @@ extern const br_ec_impl br_ec_p256_m15;
  */
 extern const br_ec_impl br_ec_p256_m31;
 
+/**
+ * \brief EC implementation "m62" (specialised code) for P-256.
+ *
+ * This implementation uses custom code relying on multiplication of
+ * integers up to 64 bits, with a 128-bit result. This implementation is
+ * defined only on platforms that offer the 64x64->128 multiplication
+ * support; use `br_ec_p256_m62_get()` to dynamically obtain a pointer
+ * to that implementation.
+ */
+extern const br_ec_impl br_ec_p256_m62;
+
+/**
+ * \brief Get the "m62" implementation of P-256, if available.
+ *
+ * \return  the implementation, or 0.
+ */
+const br_ec_impl *br_ec_p256_m62_get(void);
+
+/**
+ * \brief EC implementation "m64" (specialised code) for P-256.
+ *
+ * This implementation uses custom code relying on multiplication of
+ * integers up to 64 bits, with a 128-bit result. This implementation is
+ * defined only on platforms that offer the 64x64->128 multiplication
+ * support; use `br_ec_p256_m64_get()` to dynamically obtain a pointer
+ * to that implementation.
+ */
+extern const br_ec_impl br_ec_p256_m64;
+
+/**
+ * \brief Get the "m64" implementation of P-256, if available.
+ *
+ * \return  the implementation, or 0.
+ */
+const br_ec_impl *br_ec_p256_m64_get(void);
+
 /**
  * \brief EC implementation "i15" (generic code) for Curve25519.
  *
@@ -531,6 +567,30 @@ extern const br_ec_impl br_ec_c25519_m62;
  */
 const br_ec_impl *br_ec_c25519_m62_get(void);
 
+/**
+ * \brief EC implementation "m64" (specialised code) for Curve25519.
+ *
+ * This implementation uses custom code relying on multiplication of
+ * integers up to 64 bits, with a 128-bit result. This implementation is
+ * defined only on platforms that offer the 64x64->128 multiplication
+ * support; use `br_ec_c25519_m64_get()` to dynamically obtain a pointer
+ * to that implementation. Due to the specificities of the curve
+ * definition, the following applies:
+ *
+ *   - `muladd()` is not implemented (the function returns 0 systematically).
+ *   - `order()` returns 2^255-1, since the point multiplication algorithm
+ *     accepts any 32-bit integer as input (it clears the top bit and low
+ *     three bits systematically).
+ */
+extern const br_ec_impl br_ec_c25519_m64;
+
+/**
+ * \brief Get the "m64" implementation of Curve25519, if available.
+ *
+ * \return  the implementation, or 0.
+ */
+const br_ec_impl *br_ec_c25519_m64_get(void);
+
 /**
  * \brief Aggregate EC implementation "m15".
  *

Diff for: tools/sdk/include/bearssl/bearssl_git.h

@@ -1,2 +1,2 @@
 // Do not edit -- Automatically generated by tools/sdk/ssl/bearssl/Makefile
-#define BEARSSL_GIT 79edbc8
+#define BEARSSL_GIT 6778687

Diff for: tools/sdk/lib/libbearssl.a

@@ -3,7 +3,7 @@
 VER_H=../include/bearssl/bearssl_git.h
 
 all T0 clean: bearssl/README.txt
-	PATH=$(PATH):$(PWD)/../../xtensa-lx106-elf/bin/ && cd bearssl && make CONF=esp8266 $@
+	PATH="$(PATH):$(PWD)/../../xtensa-lx106-elf/bin/" && cd bearssl && make CONF=esp8266 $@
 
 install: all version-header
 	cp bearssl/esp8266/libbearssl.a ../lib/.