private string CalculateVer(DiscoNode n)
{
if (m_hash == null)
{
return(null);
}
// 1. Initialize an empty string S.
StringBuilder S = new StringBuilder();
// 2. Sort the service discovery identities [16] by category and then by type
// (if it exists) and then by xml:lang (if it exists), formatted as
// CATEGORY '/' [TYPE] '/' [LANG] '/' [NAME]. Note that each slash is
// included even if the TYPE, LANG, or NAME is not included.
Ident[] ids = n.GetIdentities();
Array.Sort(ids);
// 3. For each identity, append the 'category/type/lang/name' to S, followed by
// the '<' character.
foreach (Ident id in ids)
{
S.Append(id.Key);
S.Append(SEP);
}
// 4. Sort the supported service discovery features.
string[] features = n.FeatureNames;
Array.Sort(features);
// 5. For each feature, append the feature to S, followed by the '<' character.
foreach (string feature in features)
{
S.Append(feature);
S.Append(SEP);
}
// 6. If the service discovery information response includes XEP-0128 data forms,
// sort the forms by the FORM_TYPE (i.e., by the XML character
// data of the <value/> element).
Data[] ext = n.Extensions;
if (ext != null)
{
Array.Sort(ext, new FormTypeComparer());
foreach (Data x in ext)
{
// For each extended service discovery information form:
// 1. Append the XML character data of the FORM_TYPE field's <value/>
// element, followed by the '<' character.
S.Append(x.FormType);
S.Append(SEP);
// 2. Sort the fields by the value of the "var" attribute.
bedrock.collections.Tree fields = new bedrock.collections.Tree();
foreach (Field f in x.GetFields())
{
fields[f.Var] = f;
}
// 3. For each field:
foreach (System.Collections.DictionaryEntry entry in fields)
{
Field f = (Field)entry.Value;
if (f.Var == "FORM_TYPE")
{
continue;
}
// 1. Append the value of the "var" attribute, followed by the '<' character.
S.Append(f.Var);
S.Append(SEP);
// 2. Sort values by the XML character data of the <value/> element.
string[] values = f.Vals;
Array.Sort(values);
foreach (string v in values)
{
// 3. For each <value/> element, append the XML character data, followed by the '<' character.
S.Append(v);
S.Append(SEP);
}
}
}
}
// Ensure that S is encoded according to the UTF-8 encoding (RFC 3269 [16]).
byte[] input = Encoding.UTF8.GetBytes(S.ToString());
// Compute the verification string by hashing S using the algorithm specified
// in the 'hash' attribute (e.g., SHA-1 as defined in RFC 3174 [17]). The hashed
// data MUST be generated with binary output and encoded using Base64 as specified
// in Section 4 of RFC 4648 [18] (note: the Base64 output MUST NOT include
// whitespace and MUST set padding bits to zero). [19]
HashAlgorithm hasher = GetHasher(m_hash);
byte[] hash = hasher.ComputeHash(input, 0, input.Length);
return(Convert.ToBase64String(hash));
}
private string CalculateVer(DiscoNode n)
{
if (m_hash == null)
return null;
// 1. Initialize an empty string S.
StringBuilder S = new StringBuilder();
// 2. Sort the service discovery identities [16] by category and then by type
// (if it exists) and then by xml:lang (if it exists), formatted as
// CATEGORY '/' [TYPE] '/' [LANG] '/' [NAME]. Note that each slash is
// included even if the TYPE, LANG, or NAME is not included.
Ident[] ids = n.GetIdentities();
Array.Sort(ids);
// 3. For each identity, append the 'category/type/lang/name' to S, followed by
// the '<' character.
foreach (Ident id in ids)
{
S.Append(id.Key);
S.Append(SEP);
}
// 4. Sort the supported service discovery features.
string[] features = n.FeatureNames;
Array.Sort(features);
// 5. For each feature, append the feature to S, followed by the '<' character.
foreach (string feature in features)
{
S.Append(feature);
S.Append(SEP);
}
// 6. If the service discovery information response includes XEP-0128 data forms,
// sort the forms by the FORM_TYPE (i.e., by the XML character
// data of the <value/> element).
Data[] ext = n.Extensions;
if (ext != null)
{
Array.Sort(ext, new FormTypeComparer());
foreach (Data x in ext)
{
// For each extended service discovery information form:
// 1. Append the XML character data of the FORM_TYPE field's <value/>
// element, followed by the '<' character.
S.Append(x.FormType);
S.Append(SEP);
// 2. Sort the fields by the value of the "var" attribute.
bedrock.collections.Tree fields = new bedrock.collections.Tree();
foreach (Field f in x.GetFields())
fields[f.Var] = f;
// 3. For each field:
foreach (System.Collections.DictionaryEntry entry in fields)
{
Field f = (Field)entry.Value;
if (f.Var == "FORM_TYPE")
continue;
// 1. Append the value of the "var" attribute, followed by the '<' character.
S.Append(f.Var);
S.Append(SEP);
// 2. Sort values by the XML character data of the <value/> element.
string[] values = f.Vals;
Array.Sort(values);
foreach (string v in values)
{
// 3. For each <value/> element, append the XML character data, followed by the '<' character.
S.Append(v);
S.Append(SEP);
}
}
}
}
// Ensure that S is encoded according to the UTF-8 encoding (RFC 3269 [16]).
byte[] input = Encoding.UTF8.GetBytes(S.ToString());
// Compute the verification string by hashing S using the algorithm specified
// in the 'hash' attribute (e.g., SHA-1 as defined in RFC 3174 [17]). The hashed
// data MUST be generated with binary output and encoded using Base64 as specified
// in Section 4 of RFC 4648 [18] (note: the Base64 output MUST NOT include
// whitespace and MUST set padding bits to zero). [19]
HashAlgorithm hasher = GetHasher(m_hash);
byte[] hash = hasher.ComputeHash(input, 0, input.Length);
return Convert.ToBase64String(hash);
}
