esp_mbedtls_sha1_mode_ESP_MBEDTLS_SHA1_SOFTWARE

esp_idf_sys

Constant esp_mbedtls_sha1_mode_ESP_MBEDTLS_SHA1_SOFTWARE 

Source 
pub const esp_mbedtls_sha1_mode_ESP_MBEDTLS_SHA1_SOFTWARE: esp_mbedtls_sha1_mode = 2;