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SSL_GET_EX_DATA_X509_STORE_CTX_IDX(3) FreeBSD Library Functions Manual NAME SSL_get_ex_data_X509_STORE_CTX_idx - get ex_data index to access SSL structure from X509_STORE_CTX SYNOPSIS #include <openssl/ssl.h> int SSL_get_ex_data_X509_STORE_CTX_idx(void); DESCRIPTION SSL_get_ex_data_X509_STORE_CTX_idx() returns the index number under which the pointer to the SSL object is stored into the X509_STORE_CTX object. Whenever a X509_STORE_CTX object is created for the verification of the peer's certificate during a handshake, a pointer to the SSL object is stored into the X509_STORE_CTX object to identify the connection affected. To retrieve this pointer the X509_STORE_CTX_get_ex_data(3) function can be used with the correct index. This index is globally the same for all X509_STORE_CTX objects and can be retrieved using SSL_get_ex_data_X509_STORE_CTX_idx(). The index value is set when SSL_get_ex_data_X509_STORE_CTX_idx() is first called either by the application program directly or indirectly during other SSL setup functions or during the handshake. The value depends on other index values defined for X509_STORE_CTX objects before the SSL index is created. RETURN VALUES >=0 The index value to access the pointer. <0 An error occurred, check the error stack for a detailed error message. EXAMPLES The index returned from SSL_get_ex_data_X509_STORE_CTX_idx() provides access to SSL object for the connection during the verify_callback() when checking the peer's certificate. Check the example in SSL_CTX_set_verify(3). SEE ALSO CRYPTO_set_ex_data(3), ssl(3), SSL_CTX_set_verify(3) HISTORY SSL_get_ex_data_X509_STORE_CTX_idx() first appeared in SSLeay 0.9.1 and has been available since OpenBSD 2.6. FreeBSD 14.1-RELEASE-p8 February 6, 2022 FreeBSD 14.1-RELEASE-p8