smallstack refactors for wolfcrypt/src/rsa.c:wc_CheckProbablePrime_ex() and wolfcrypt/src/pwdbased.c:wc_PKCS12_PBKDF_ex();
add WARN_UNUSED_RESULT macro to types.h;
text format cleanup;
fix internal.c:LowResTimer() implementation.
refactor tls13.c:TimeNowInMilliseconds() for kernel 4.9 and 3.16 compat.
use ktime_get_coarse_real_ts64() only for kernel 5.x+. in kernel 4.x, use its older form, current_kernel_time64(), and in 3.x, use getnstimeofday().
linuxkm/module_hooks.c: fix wolfssl_init() pie code to be compatible with kernel 4.4-;
fix allocate_wolfcrypt_irq_fpu_states() return codes to all be wolfcrypt codes, and in calling code, pass up that code (suggested by dgarske peer review).
configure.ac: fix ed25519/sha512 dependency test to not misfire when ENABLED_32BIT;
wolfssl/wolfcrypt/curve{25519,448}.h: fix redundant typedefs of curve{25519,448}_key (fixes -Wpedantic warnings);
configure.ac: fix for "ISO C forbids an empty translation unit [-Werror=pedantic]", re wolfcrypt/src/sp_c{32,64}.c;
configure.ac: fixes for --enable-32bit versus pedantic "ISO C forbids an empty translation unit", including explicit exclusion of 32bit-incompatible algorithms from enable-all and enable-all-crypto sets;
tests/api.c: fixes for a couple inadequately gated SHA2 dependencies;
tests/api.c:test_wolfSSL_set_alpn_protos(): fix prototype missing (void);
wolfcrypt/src/misc.c and wolfssl/wolfcrypt/misc.h: fix ForceZero() definition and NO_INLINE prototype to not counterfactually constify the mem ptr, to avoid -Wmaybe-uninitialized from gcc11;
wolfcrypt/src/des3.c: drop obsolete register qualifier from declaration in DesSetKey(), for c++17 compatibility;
src/ssl.c:wolfSSL_BN_mod_word(): fix cast of arg2 to mp_mod_d().
add build-time support for module signing using native Linux facility;
add support for alternative licenses using WOLFSSL_LICENSE macro;
improve load-time kernel log messages;
add support for sp-math-all asm/AVX2 acceleration;
add error-checking and return in SAVE_VECTOR_REGISTERS();
implement support for x86 accelerated crypto from interrupt handlers, gated on WOLFSSL_LINUXKM_SIMD_X86_IRQ_ALLOWED:
* wolfcrypt_irq_fpu_states
* am_in_hard_interrupt_handler()
* allocate_wolfcrypt_irq_fpu_states()
* free_wolfcrypt_irq_fpu_states()
* save_vector_registers_x86()
* restore_vector_registers_x86()
add WOLFSSL_LINUXKM_SIMD, WOLFSSL_LINUXKM_SIMD_X86, and WOLFSSL_LINUXKM_SIMD_ARM macros for more readable gating.
* `wolfSSL_PEM_write_bio_PUBKEY` needs to write only the public part
The `wolfSSL_PEM_write_bio_PUBKEY` output can't contain the private portion of the key. This output could be used to distribute the public key and if it contains the private part then it gets leaked to others.
* Add heap hint to `wolfSSL_RSA_To_Der`
* Correct function name in logs
Use --enable-armasm=sha512-crypto or define WOLFSSL_ARMASM_CRYPTO_SHA512
to use SHA512 cryptographic instructions.
Checks system register for the feature before using the SHA512
instructions.
Added SHA512 input data alignment test.
Add support for SHA512/224 and SHA512/256 to ARM port.
