Provided by: gnutls-doc_3.6.9-5ubuntu1_all
gnutls_x509_crt_get_issuer_unique_id - API function
#include <gnutls/x509.h> int gnutls_x509_crt_get_issuer_unique_id(gnutls_x509_crt_t crt, char * buf, size_t * buf_size);
gnutls_x509_crt_t crt Holds the certificate char * buf user allocated memory buffer, will hold the unique id size_t * buf_size size of user allocated memory buffer (on input), will hold actual size of the unique ID on return.
This function will extract the issuerUniqueID value (if present) for the given certificate. If the user allocated memory buffer is not large enough to hold the full subjectUniqueID, then a GNUTLS_E_SHORT_MEMORY_BUFFER error will be returned, and buf_size will be set to the actual length. This function had a bug prior to 3.4.8 that prevented the setting of NULL buf to discover the buf_size . To use this function safely with the older versions the buf must be a valid buffer that can hold at least a single byte if buf_size is zero.
GNUTLS_E_SUCCESS on success, otherwise a negative error code.
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