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It is that maybe less modification working on the components is better, so I just modified the platform code of AES, SHA and so on. ESP8266 has no real hardware AES, SHA or bignum peripheral, but some method can speed up the process of part of upper algorithm, so I also added the platform code of AES, SHA, bignum, ARC, MD5. ESP8266 has no platform of bignum, so users should not enable the bignum hardware at "menuconfig".
README esp-idf compile and 'AR' user program as target library 'libmain.a', so we should not use library which is named 'libmain.a'. We use 'libcore.a' instead of it. As I konwn, you can do following: 1. rename libmain.a to libcore.a 2. change text "*libmain.a:spi_flash.o(.literal .text .literal.* .text.*)" to "*libcore.a:spi_flash.o(.literal .text .literal.* .text.*)" in file 'eagle.app.v6.common.ld'