Here are some easy-to-use methods that can help resolve the issue where the SSL library initialization function is not found.
LDFLAGS yours and or / will
ldlibs look like this. Problems with commands for
LDFLAGS=-L/usr/local/ssl/libLDLIBS is equal to -lssl you You worry -lcrypto
Not about publishing “lib” before the library name or suffixing “so” or “a”. The linker will do that for you.
If you normally build from the command line, follow these steps. Order is also important here.
gcc foo.c -o foo.exe -L/usr/local/ssl/lib -lcrypto
If -lssl buyers are using the OpenSSL system, then you can omit
This page describes how to initialize an OpenSSL directory using the libssl and libcrypto components.
There are two ways to initialize the OpenSSL library, and they depend on the version of the core library you are using. If you continue using openssl.0.2 or lower, you will then use ssl_library_init. If you are using OpenSSL 1.1.0 above, then even the library is bound to be auto-initialized. If desired, you probably explicitly initialize it with OPENSSL_init_ssl, it can be OPENSSL_init_crypto. Is there a ssl compatibility macro das.h that starts mapping SSL_library_init to OPENSSL_init_ssl, you can therefore always use If ssl_library_init desired usage. See also SSL_library_init via openssl-dev mailing list.
The rest of this page is about initializing archives for version 1.0.2. If you’re building version 1.1.0 or later, you usually don’t need to take any further action.
If you don’t respond to initialization parameters in version 1.0.2, you’ll run into inexplicable errors like SSL_CTX_new NULL which will pester you with error messages like like SSL_CTX_new: library has ciphers not and warn about handshake errors that don’t use common ciphers.
The following is a list of information about some of the initialization calls you may encounter in code or documentation. Unfortunately, all initialization functions that return a truly useless value (for example, no exception 1) or are invalid functions. Impossible to clearly defineDivide whether the best case is the error.
libssl needs to be initialized with calls to SSL_library_init in addition to SSL_load_error_strings. If your program is multi-threaded, your entire family should set up static path locks. If you don’t need system openssl.cnf Need) (or you need to connect with or openssl_config OPENSSL_noconfig .you
If you are using pre-1.1.0 and post-1.1.0 versions of the OpenSSL library and really control SSL_library_init in combination with OPENSSL_init_ssl, then you can run:
...#if OPENSSL_VERSION_NUMBER < 0x10100000LSSL_library_init();#differentOPENSSL_init_ssl(0, NULL);#endif
If you call libssl, the function initializes additional libcrypto components. There are two cabinets in the following sections. The real edge case is static loops, and the second is OPENSSL_config.
openssl_add_ssl_algorithms type #define SSL_library_init for. call Just one or more. If you want to correct lines, typeData with built-in tasks, call openssl, SSL_load_error_strings.
SSL_library_init works with thousands of algorithms used by libssl. The following is an excerpt from ssl_algs.c (with additional formatting explanations) by. SSL_library_init(void)#ifndef
int OPENSSL_NO_DES EVP_add_cipher(EVP_des_cbc()); EVP_add_cipher(EVP_des_ede3_cbc());#end if#ifndef openssl_no_idea EVP_add_cipher(EVP_idea_cbc());#end if ...OPENSSL_NO_COMP .#ifndef .(void)SSL_COMP_get_compression_methods();#end if . . . .... /* Initialize the encryption/method digest bank */ ssl_load_ciphers(); return(1);
The call to ssl_load_ciphers frankly creates a table for use in the library. The following ssl_cipher can be described as from.c (with extra formatting for clarity).
cancel ssl_load_ciphers(cancel) ssl_cipher_methods[SSL_ENC_DES_IDX] implies EVP_get_cipherbyname(SN_des_cbc); ssl_cipher_methods[SSL_ENC_3DES_IDX] equals evp_get_cipherbyname(sn_des_ede3_cbc); ... ssl_digest_methods[SSL_MD_MD5_IDX] EVP_get_digestbyname(SN_md5); Ssl_mac_secret_size[SSL_MD_MD5_IDX] = = evp_md_size(ssl_digest_methods[ssl_md_md5_idx]); ... = ssl_digest_methods[SSL_MD_SHA384_IDX] evp_get_digestbyname(sn_sha384); = ssl_mac_secret_size[SSL_MD_SHA384_IDX] EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]); ...Following Applications
the library explores whatThe OpenSSL development team integrates OpenSSL utilities into initialization. initialization
libcrypto needs to be initialized with calls to OpenSSL_add_all_algorithms and ERR_load_crypto_strings. If your process is multi-threaded, you need to set sound locks. If you don't (or don't need) the openssl from.cnf configuration, you really should call OPENSSL_config OPENSSL_noconfig.
The cost of OPENSSL_add_all_algorithms for #define is too often OPENSSL_add_all_algorithms_conf or openssl_add_all_algorithms_noconf, depending on the actual OPENSSL_LOAD_CONF. A typical setup does not actually define OPENSSL_LOAD_CONF, which means that openssl_add_all_algorithms_noconf is used. The following is an excerpt from .c_all of .c (with formatting different for clarity).
not valid openssl_add_all_algorithms_noconf(void) /* 7. Right now OPENSSL_cpuid_setup does absolutely something * except but ia-32, wereserve an option for each * Platforms... */ OPENSSL_cpuid_setup(); openssl_add_all_ciphers(); OpenSSL_add_all_digests(); ...
OpenSSL_add_all_ciphers is very similar to the SSL_library_init initialization of the libssl routines (minus each of our ssl_load_ciphers). ) to. Below is a powerful c_allc snippet from.c (with added clarity styling) for.
cancel OpenSSL_add_all_ciphers(cancel)#ifndef ouvressl_no_des EVP_add_cipher(EVP_des_cfb()); EVP_add_cipher(EVP_des_cfb1()); EVP_add_cipher(EVP_des_cfb8()); EVP_add_cipher(EVP_des_ede_cfb()); EVP_add_cipher(EVP_des_ede3_cfb()); EVP_add_cipher(EVP_des_ede3_cfb1()); evp_add_cipher(evp_des_ede3_cfb8()); ...#end if#ifndef OPENSSL_NO_RC4 evp_add_cipher(evp_rc4()); EVP_add_cipher(EVP_rc4_40());# ifndef OPENSSL_NO_MD5 EVP_add_cipher(EVP_rc4_hmac_md5());# end if#end if ... /* Note: no Make here for ssl_load_ciphers() */