Large difference in exported symbols between Windows DLL and Linux shared builds

Steven Reddie Sat, 23 Oct 2004 07:40:03 -0700

There are a large number of differences in the exported symbols between Windows and Linux builds. Some of them seem surprising.

I built 0.9.7d on Windows with the following commands:

    perl Configure VC-WIN32
    ms\do_ms.bat
    nmake -f ms\ntdll.mak

And on Linux, after adding EXPORT_VAR_AS_FN to the linux-pentium target in Configure in an attempt to reduce differences between the two platforms, I built and extracted exported symbols with the following commands:

    ./config shared
    make
    nm -D libcrypto.so.0.9.7 | grep ' [DRT] ' > symbols

On Windows, there were some minor differences between the exports listed in ms\libeay32.def and what was actually exported from the DLL ("dumpbin /exports libeay32.dll"). The DLL contained the following additional symbols:

    CAST_S_table0
    CAST_S_table1
    CAST_S_table2
    CAST_S_table3
    CAST_S_table4
    CAST_S_table5
    CAST_S_table6
    CAST_S_table7
    DES_SPtrans
    OSSL_DES_version
    OSSL_libdes_version

Differences between Windows and Linux are as follows.

Windows contained these expected extra symbols:

RAND_event
RAND_screen

Linux contained these extra text symbols (data symbols further below):

    _CONF_add_string
    _CONF_free_data
    _CONF_get_section
    _CONF_get_section_values
    _CONF_get_string
    _CONF_new_data
    _CONF_new_section
    _des_crypt
    asn1_primitive_clear
    BIO_ACCEPT_free
    BIO_ACCEPT_new
    BIO_CONNECT_free
    BIO_CONNECT_new
    BIO_s_log
    bn_cmp_part_words
    bn_cmp_words
    bn_mul_comba4
    bn_mul_comba8
    bn_mul_high
    bn_mul_low_normal
    bn_mul_low_recursive
    bn_mul_normal
    bn_mul_part_recursive
    bn_mul_recursive
    bn_sqr_comba4
    bn_sqr_comba8
    bn_sqr_normal
    bn_sqr_recursive
    d2i_NETSCAPE_ENCRYPTED_PKEY
    d2i_NETSCAPE_PKEY
    DHparams_it
    dsa_pub_internal_it
    DSA_SIG_it
    DSAparams_it
    DSAPrivateKey_it
    DSAPublicKey_it
    ec_GFp_mont_field_decode
    ec_GFp_mont_field_encode
    ec_GFp_mont_field_mul
    ec_GFp_mont_field_set_to_one
    ec_GFp_mont_field_sqr
    ec_GFp_mont_group_clear_finish
    ec_GFp_mont_group_copy
    ec_GFp_mont_group_finish
    ec_GFp_mont_group_init
    ec_GFp_mont_group_set_curve_GFp
    ec_GFp_nist_group_init
    ec_GFp_recp_group_init
    ec_GFp_simple_add
    ec_GFp_simple_cmp
    ec_GFp_simple_dbl
    ec_GFp_simple_field_mul
    ec_GFp_simple_field_sqr
    ec_GFp_simple_get_Jprojective_coordinates_GFp
    ec_GFp_simple_group_clear_finish
    ec_GFp_simple_group_copy
    ec_GFp_simple_group_finish
    ec_GFp_simple_group_get_cofactor
    ec_GFp_simple_group_get_curve_GFp
    ec_GFp_simple_group_get_order
    ec_GFp_simple_group_get0_generator
    ec_GFp_simple_group_init
    ec_GFp_simple_group_set_curve_GFp
    ec_GFp_simple_group_set_generator
    ec_GFp_simple_invert
    ec_GFp_simple_is_at_infinity
    ec_GFp_simple_is_on_curve
    ec_GFp_simple_make_affine
    ec_GFp_simple_oct2point
    ec_GFp_simple_point_clear_finish
    ec_GFp_simple_point_copy
    ec_GFp_simple_point_finish
    ec_GFp_simple_point_get_affine_coordinates_GFp
    ec_GFp_simple_point_init
    ec_GFp_simple_point_set_affine_coordinates_GFp
    ec_GFp_simple_point_set_to_infinity
    ec_GFp_simple_point2oct
    ec_GFp_simple_points_make_affine
    ec_GFp_simple_set_compressed_coordinates_GFp
    ec_GFp_simple_set_Jprojective_coordinates_GFp
    EC_GROUP_clear_free_extra_data
    EC_GROUP_free_extra_data
    EC_GROUP_get_extra_data
    EC_GROUP_set_extra_data
    engine_cleanup_add_first
    engine_cleanup_add_last
    engine_free_util
    engine_set_all_null
    engine_table_cleanup
    engine_table_register
    engine_table_select
    engine_table_unregister
    engine_unlocked_finish
    engine_unlocked_init
    fcrypt_body
    i2d_NETSCAPE_ENCRYPTED_PKEY
    i2d_NETSCAPE_PKEY
    md4_block_host_order
    md5_block_asm_host_order
    MGF1
    NETSCAPE_ENCRYPTED_PKEY_free
    NETSCAPE_ENCRYPTED_PKEY_it
    NETSCAPE_ENCRYPTED_PKEY_new
    NETSCAPE_PKEY_free
    NETSCAPE_PKEY_it
    NETSCAPE_PKEY_new
    OPENSSL_gmtime
    ripemd160_block_asm_host_order
    sha_block_data_order
    sha_block_host_order
    sha1_block_asm_data_order
    sha1_block_asm_host_order
    X509_ATTRIBUTE_SET_it
    X509_NAME_ENTRIES_it
    X509_NAME_INTERNAL_it

These are the extra data symbols exported on Linux:

    AES_version
    ASN1_version
    BF_version
    BN_version
    CAST_version
    cleanse_ctr
    CONF_def_version
    CONF_version
    DH_version
    DSA_version
    EVP_version
    IDEA_version
    lh_version
    MD2_version
    MD4_version
    D5_version
    p_CSwift_AcquireAccContext
    p_CSwift_AttachKeyParam
    p_CSwift_ReleaseAccContext
    p_CSwift_SimpleRequest
    PEM_version
    rand_ssleay_meth
    RAND_version
    RC2_version
    RC4_version
    RC5_version
    RMD160_version
    RSA_version
    SHA_version
    SHA1_version
    STACK_version
    TXT_DB_version
    v3_akey_id
    v3_alt
    v3_bcons
    v3_cpols
    v3_crl_hold
    v3_crl_invdate
    v3_crl_num
    v3_crl_reason
    v3_crld
    v3_ext_ku
    v3_info
    v3_key_usage
    v3_ns_ia5_list
    v3_nscert
    v3_ocsp_accresp
    v3_ocsp_acutoff
    v3_ocsp_crlid
    v3_ocsp_nocheck
    v3_ocsp_nonce
    v3_ocsp_serviceloc
    v3_pkey_usage_period
    v3_sinfo
    v3_skey_id
    v3_sxnet
    x509_dir_lookup
    x509_file_lookup
    x509_name_ff
    X509_version

Does anyone know if much of this is expected. It looks like at least a few of them are incorrect, eg. I expect that there should be no differences between platforms in relation to NETSCAPE_ENCRYPTED_PKEY and NETSCAPE_PKEY. Perhaps all of the symbols similar to ec_GFp_mont_field_decode are really meant to be internal only but are being exported due to the -Wl,--whole-archive option being used when the shared library is built.

Regards,

Steven

Large difference in exported symbols between Windows DLL and Linux shared builds

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