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asio: Use internal ssl context and engine impl

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Implement asio-ssl layer with three classes in asio::ssl::mbedtls:
* context -- replaces SSL_CTX, used mainly as a container to options,
certs, keys
* engine -- replaces SSL, implements the actual mbedtls operations
* bio -- implements openssl BIO specifically tailered to mbedtls and
its asio usage

Further updates:
* asio: Used shared_ptr<> for bio pairs
* asio: Add error checks to mbedtls-bio
* asio: Address potential ssl-context ownership issue
* asio: Address potential bio-engine ownership issue


* Original commit: espressif/esp-idf@d823106aa6
This commit is contained in:
David Cermak
2021-10-14 10:17:24 +02:00
committed by gabsuren
parent abbc8d9c5a
commit f605fdd632
25 changed files with 1014 additions and 321 deletions
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9
components/asio/Kconfig
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@ -24,4 +24,13 @@ menu "ESP-ASIO"
bool "wolfSSL (License info in wolfSSL directory README)"
endchoice
config ASIO_SSL_BIO_SIZE
int "Size of BIO object"
default 1024
depends on ASIO_SSL_SUPPORT
help
Size in bytes of SSL-BIO implementation.
Reducing the BIO size saves more RAM, but may slow down input output operations due to
fragmentation.
endmenu