EVP_CIPHER_block_size
int EVP_CIPHER_block_size(const EVP_CIPHER *cipher);
LCRYPTO_ALIAS(EVP_CIPHER_block_size);
LCRYPTO_USED(EVP_CIPHER_block_size);
length = EVP_CIPHER_block_size(cipher);
length = EVP_CIPHER_block_size(cipher);
length = EVP_CIPHER_block_size(cipher);
bs = EVP_CIPHER_block_size(cipher);