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34 * Message protection services: determine maximum input size.
37 #include "gssapiP_eap.h"
40 gss_wrap_size_limit(OM_uint32 *minor,
44 OM_uint32 req_output_size,
45 OM_uint32 *max_input_size)
47 gss_iov_buffer_desc iov[4];
48 OM_uint32 major, overhead;
50 if (ctx == GSS_C_NO_CONTEXT) {
52 return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
57 GSSEAP_MUTEX_LOCK(&ctx->mutex);
59 if (!CTX_IS_ESTABLISHED(ctx)) {
60 major = GSS_S_NO_CONTEXT;
61 *minor = GSSEAP_CONTEXT_INCOMPLETE;
65 iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
66 iov[0].buffer.value = NULL;
67 iov[0].buffer.length = 0;
69 iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
70 iov[1].buffer.length = req_output_size;
71 iov[1].buffer.value = NULL;
73 iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
74 iov[2].buffer.value = NULL;
75 iov[2].buffer.length = 0;
77 iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
78 iov[3].buffer.value = NULL;
79 iov[3].buffer.length = 0;
81 major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
86 overhead = iov[0].buffer.length + iov[3].buffer.length;
88 if (iov[2].buffer.length == 0 && overhead < req_output_size)
89 *max_input_size = req_output_size - overhead;
94 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);