Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

third_party/mbedtls/ctr_drbg.c

@@ -492,8 +492,8 @@ int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
  *   ctx contains new_working_state
  */
 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
-                              unsigned char *output, size_t output_len,
-                              const unsigned char *additional, size_t add_len )
+                                      unsigned char *output, size_t output_len,
+                                      const unsigned char *additional, size_t add_len )
 {
     int ret = 0;
     mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
@@ -568,6 +568,21 @@ exit:
     return( ret );
 }
 
+/**
+ * \brief   This function uses CTR_DRBG to generate random data.
+ *
+ * This function automatically reseeds if the reseed counter is exceeded
+ * or prediction resistance is enabled.
+ *
+ * \param p_rng         The CTR_DRBG context. This must be a pointer to a
+ *                      #mbedtls_ctr_drbg_context structure.
+ * \param output        The buffer to fill.
+ * \param output_len    The length of the buffer in bytes.
+ *
+ * \return              \c 0 on success.
+ * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
+ *                      #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure.
+ */
 int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output,
                              size_t output_len )
 {
@@ -822,7 +837,7 @@ int mbedtls_ctr_drbg_self_test( int verbose )
     mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_pr ) ) );
-    CHK( memcmp( buf, result_pr, sizeof( result_pr ) ) );
+    CHK( timingsafe_bcmp( buf, result_pr, sizeof( result_pr ) ) );
 
     mbedtls_ctr_drbg_free( &ctx );
 
@@ -847,7 +862,7 @@ int mbedtls_ctr_drbg_self_test( int verbose )
     CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_nopr ) ) );
-    CHK( memcmp( buf, result_nopr, sizeof( result_nopr ) ) );
+    CHK( timingsafe_bcmp( buf, result_nopr, sizeof( result_nopr ) ) );
 
     mbedtls_ctr_drbg_free( &ctx );