SSL_set_block_padding
int SSL_set_block_padding(SSL *ssl, size_t block_size);
if (!TEST_true(SSL_set_block_padding(ssl, 0))
|| !TEST_true(SSL_set_block_padding(ssl, 1))
|| !TEST_false(SSL_set_block_padding(ssl, 2)))
if (!TEST_false(SSL_set_block_padding(clientssl,
if (!TEST_true(SSL_set_block_padding(clientssl, 512)))