const DEFAULT_BUF_SIZE = 64

# TODO: Add here the missing related to those three
const SSL_FILETYPE_PEM = 1
const SSL_OP_NO_SSLv3 = 0x02000000
const EVP_MAX_MD_SIZE = 64

const BIO_FLAGS_READ         = 0x01
const BIO_FLAGS_WRITE        = 0x02
const BIO_FLAGS_IO_SPECIAL   = 0x03
const BIO_FLAGS_RWS          = (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
const BIO_FLAGS_SHOULD_RETRY = 0x08
const BIO_FLAGS_MEM_RDONLY   = 0x200
const BIO_FLAGS_NONCLEAR_RST = 0x400
const BIO_FLAGS_IN_EOF       = 0x800

@enum SSL_ERRORS begin
    SSL_ERROR = 1
    SSL_WANT_READ = 2
    SSL_WANT_WRITE = 3
    SSL_SYSCALL = 5
    SSL_ZERO_RETURN = 6
end

@enum SSL_VERIFY begin
    VERIFY_NONE = 0x00
    VERIFY_PEER = 0x01
    VERIFY_FAIL_IF_NO_PEER_CERT = 0x02
    VERIFY_CLIENT_ONCE = 0x04
    VERIFY_POST_HANDSHAKE = 0x08
end

@enum SSL_VERSION begin
    SSL3_VERSION = 0x0300
    TLS1_VERSION
    TLS1_1_VERSION
    TLS1_2_VERSION
    TLS1_3_VERSION
end

@enum SSL_CTRL begin
    SSL_CERT_SET_FIRST = 1
    SSL_CERT_SET_NEXT = 2
    SSL_CERT_SET_SERVER = 3
    # SSL_CTRL_SET_TMP_DH = 3
    SSL_CTRL_SET_TMP_ECDH = 4
    SSL_CTRL_SET_TMP_DH_CB = 6
    SSL_CTRL_GET_CLIENT_CERT_REQUEST = 9
    SSL_CTRL_GET_NUM_RENEGOTIATIONS = 10
    SSL_CTRL_CLEAR_NUM_RENEGOTIATIONS = 11
    SSL_CTRL_GET_TOTAL_RENEGOTIATIONS = 12
    SSL_CTRL_GET_FLAGS = 13
    SSL_CTRL_EXTRA_CHAIN_CERT = 14
    SSL_CTRL_SET_MSG_CALLBACK = 15
    SSL_CTRL_SET_MSG_CALLBACK_ARG = 16
    SSL_CTRL_SET_MTU = 17
    SSL_CTRL_SESS_NUMBER = 20
    SSL_CTRL_SESS_CONNECT = 21
    SSL_CTRL_SESS_CONNECT_GOOD = 22
    SSL_CTRL_SESS_CONNECT_RENEGOTIATE = 23
    SSL_CTRL_SESS_ACCEPT = 24
    SSL_CTRL_SESS_ACCEPT_GOOD = 25
    SSL_CTRL_SESS_ACCEPT_RENEGOTIATE = 26
    SSL_CTRL_SESS_HIT = 27
    SSL_CTRL_SESS_CB_HIT = 28
    SSL_CTRL_SESS_MISSES = 29
    SSL_CTRL_SESS_TIMEOUTS = 30
    SSL_CTRL_SESS_CACHE_FULL = 31
    SSL_CTRL_MODE = 33
    SSL_CTRL_GET_READ_AHEAD = 40
    SSL_CTRL_SET_READ_AHEAD = 41
    SSL_CTRL_SET_SESS_CACHE_SIZE = 42
    SSL_CTRL_GET_SESS_CACHE_SIZE = 43
    SSL_CTRL_SET_SESS_CACHE_MODE = 44
    SSL_CTRL_GET_SESS_CACHE_MODE = 45
    SSL_CTRL_GET_MAX_CERT_LIST = 50
    SSL_CTRL_SET_MAX_CERT_LIST = 51
    SSL_CTRL_SET_MAX_SEND_FRAGMENT = 52
    SSL_CTRL_SET_TLSEXT_SERVERNAME_CB = 53
    SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG = 54
    SSL_CTRL_SET_TLSEXT_HOSTNAME = 55
    SSL_CTRL_SET_TLSEXT_DEBUG_CB = 56
    SSL_CTRL_SET_TLSEXT_DEBUG_ARG = 57
    SSL_CTRL_GET_TLSEXT_TICKET_KEYS = 58
    SSL_CTRL_SET_TLSEXT_TICKET_KEYS = 59
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB = 63
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG = 64
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE = 65
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS = 66
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS = 67
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS = 68
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS = 69
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP = 70
    SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP = 71
    SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB = 75
    SSL_CTRL_SET_SRP_VERIFY_PARAM_CB = 76
    SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB = 77
    SSL_CTRL_SET_SRP_ARG = 78
    SSL_CTRL_SET_TLS_EXT_SRP_USERNAME = 79
    SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH = 80
    SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD = 81
    DTLS_CTRL_GET_TIMEOUT = 73
    DTLS_CTRL_HANDLE_TIMEOUT = 74
    # SSL_CTRL_GET_RI_SUPPORT = 76
    # SSL_CTRL_CLEAR_MODE = 78
    # SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB = 79
    SSL_CTRL_GET_EXTRA_CHAIN_CERTS = 82
    SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS = 83
    SSL_CTRL_CHAIN = 88
    SSL_CTRL_CHAIN_CERT = 89
    SSL_CTRL_GET_GROUPS = 90
    SSL_CTRL_SET_GROUPS = 91
    SSL_CTRL_SET_GROUPS_LIST = 92
    SSL_CTRL_GET_SHARED_GROUP = 93
    SSL_CTRL_SET_SIGALGS = 97
    SSL_CTRL_SET_SIGALGS_LIST = 98
    SSL_CTRL_CERT_FLAGS = 99
    SSL_CTRL_CLEAR_CERT_FLAGS = 100
    SSL_CTRL_SET_CLIENT_SIGALGS = 101
    SSL_CTRL_SET_CLIENT_SIGALGS_LIST = 102
    SSL_CTRL_GET_CLIENT_CERT_TYPES = 103
    SSL_CTRL_SET_CLIENT_CERT_TYPES = 104
    SSL_CTRL_BUILD_CERT_CHAIN = 105
    SSL_CTRL_SET_VERIFY_CERT_STORE = 106
    SSL_CTRL_SET_CHAIN_CERT_STORE = 107
    SSL_CTRL_GET_PEER_SIGNATURE_NID = 108
    SSL_CTRL_GET_PEER_TMP_KEY = 109
    SSL_CTRL_GET_RAW_CIPHERLIST = 110
    SSL_CTRL_GET_EC_POINT_FORMATS = 111
    SSL_CTRL_GET_CHAIN_CERTS = 115
    SSL_CTRL_SELECT_CURRENT_CERT = 116
    SSL_CTRL_SET_CURRENT_CERT = 117
    SSL_CTRL_SET_DH_AUTO = 118
    DTLS_CTRL_SET_LINK_MTU = 120
    DTLS_CTRL_GET_LINK_MIN_MTU = 121
    SSL_CTRL_GET_EXTMS_SUPPORT = 122
    SSL_CTRL_SET_MIN_PROTO_VERSION = 123
    SSL_CTRL_SET_MAX_PROTO_VERSION = 124
    SSL_CTRL_SET_SPLIT_SEND_FRAGMENT = 125
    SSL_CTRL_SET_MAX_PIPELINES = 126
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_TYPE = 127
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB = 128
    SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB_ARG = 129
    SSL_CTRL_GET_MIN_PROTO_VERSION = 130
    SSL_CTRL_GET_MAX_PROTO_VERSION = 131
    SSL_CTRL_GET_SIGNATURE_NID = 132
    SSL_CTRL_GET_TMP_KEY = 133
    SSL_CTRL_GET_NEGOTIATED_GROUP = 134
end