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[toppylawz]

pressing gcc -Wall openssl_aes.c -lcrypto
it showed the following error:
openssl_aes.c: In function ‘aes_encrypt’: openssl_aes.c:49:22: error: ‘AES_BLOCK_SIZE’ undeclared (first use in this function) int c_len = *len + AES_BLOCK_SIZE, f_len = 0; ^~~~~~~~~~~~~~ openssl_aes.c:49:22: note: each undeclared identifier is reported only once for each function it appears in openssl_aes.c: In function ‘main’: openssl_aes.c:87:18: error: storage size of ‘en’ isn’t known EVP_CIPHER_CTX en, de; ^~ openssl_aes.c:87:22: error: storage size of ‘de’ isn’t known EVP_CIPHER_CTX en, de; ^~ openssl_aes.c:87:22: warning: unused variable ‘de’ [-Wunused-variable] openssl_aes.c:87:18: warning: unused variable ‘en’ [-Wunused-variable] EVP_CIPHER_CTX en, de;

[keineahnung2345]

You have to add #include <openssl/aes.h>. And if you are using Openssl 1.1.1, please try #5.