Provided by: liboauth-dev_1.0.1-1_amd64 bug

NAME

       oauth.h -

       OAuth.net implementation in POSIX-C.

SYNOPSIS

   Enumerations
       enum OAuthMethod { OA_HMAC =0, OA_RSA, OA_PLAINTEXT }
           signature method to used for signing the request.

   Functions
       char * oauth_encode_base64 (int size, const unsigned char *src)
           Base64 encode and return size data in 'src'.
       int oauth_decode_base64 (unsigned char *dest, const char *src)
           Decode the base64 encoded string 'src' into the memory pointed to by 'dest'.
       char * oauth_url_escape (const char *string)
           Escape 'string' according to RFC3986 and
           http://oauth.net/core/1.0/#encoding_parameters.
       char * oauth_url_unescape (const char *string, size_t *olen)
           Parse RFC3986 encoded 'string' back to unescaped version.
       char * oauth_sign_hmac_sha1 (const char *m, const char *k)
           returns base64 encoded HMAC-SHA1 signature for given message and key.
       char * oauth_sign_hmac_sha1_raw (const char *m, const size_t ml, const char *k, const
           size_t kl)
           same as oauth_sign_hmac_sha1 but allows one to specify length of message and key (in
           case they contain null chars).
       char * oauth_sign_plaintext (const char *m, const char *k)
           returns plaintext signature for the given key.
       char * oauth_sign_rsa_sha1 (const char *m, const char *k)
           returns RSA-SHA1 signature for given data.
       int oauth_verify_rsa_sha1 (const char *m, const char *c, const char *s)
           verify RSA-SHA1 signature.
       char * oauth_catenc (int len,...)
           url-escape strings and concatenate with '&' separator.
       int oauth_split_url_parameters (const char *url, char ***argv)
           splits the given url into a parameter array.
       int oauth_split_post_paramters (const char *url, char ***argv, short qesc)
           splits the given url into a parameter array.
       char * oauth_serialize_url (int argc, int start, char **argv)
           build a url query string from an array.
       char * oauth_serialize_url_sep (int argc, int start, char **argv, char *sep, int mod)
           encode query parameters from an array.
       char * oauth_serialize_url_parameters (int argc, char **argv)
           build a query parameter string from an array.
       char * oauth_gen_nonce ()
           generate a random string between 15 and 32 chars length and return a pointer to it.
       int oauth_cmpstringp (const void *p1, const void *p2)
           string compare function for oauth parameters.
       int oauth_param_exists (char **argv, int argc, char *key)
           search array for parameter key.
       void oauth_add_param_to_array (int *argcp, char ***argvp, const char *addparam)
           add query parameter to array
       void oauth_free_array (int *argcp, char ***argvp)
           free array args
       int oauth_time_independent_equals_n (const char *a, const char *b, size_t len_a, size_t
           len_b)
           compare two strings in constant-time (as to not let an attacker guess how many leading
           chars are correct: http://rdist.root.org/2010/01/07/timing-independent-array-
           comparison/ )
       int oauth_time_indepenent_equals_n (const char *a, const char *b, size_t len_a, size_t
           len_b) attribute_deprecated
       int oauth_time_independent_equals (const char *a, const char *b)
           compare two strings in constant-time.
       int oauth_time_indepenent_equals (const char *a, const char *b) attribute_deprecated
       char * oauth_sign_url2 (const char *url, char **postargs, OAuthMethod method, const char
           *http_method, const char *c_key, const char *c_secret, const char *t_key, const char
           *t_secret)
           calculate OAuth-signature for a given HTTP request URL, parameters and oauth-tokens.
       char * oauth_sign_url (const char *url, char **postargs, OAuthMethod method, const char
           *c_key, const char *c_secret, const char *t_key, const char *t_secret)
           attribute_deprecated
       void oauth_sign_array2_process (int *argcp, char ***argvp, char **postargs, OAuthMethod
           method, const char *http_method, const char *c_key, const char *c_secret, const char
           *t_key, const char *t_secret)
           the back-end behind by /ref oauth_sign_array2.
       char * oauth_sign_array2 (int *argcp, char ***argvp, char **postargs, OAuthMethod method,
           const char *http_method, const char *c_key, const char *c_secret, const char *t_key,
           const char *t_secret)
           same as /ref oauth_sign_url with the url already split into parameter array
       char * oauth_sign_array (int *argcp, char ***argvp, char **postargs, OAuthMethod method,
           const char *c_key, const char *c_secret, const char *t_key, const char *t_secret)
           attribute_deprecated
       char * oauth_body_hash_file (char *filename)
           calculate body hash (sha1sum) of given file and return a oauth_body_hash=xxxx
           parameter to be added to the request.
       char * oauth_body_hash_data (size_t length, const char *data)
           calculate body hash (sha1sum) of given data and return a oauth_body_hash=xxxx
           parameter to be added to the request.
       char * oauth_body_hash_encode (size_t len, unsigned char *digest)
           base64 encode digest, free it and return a URL parameter with the oauth_body_hash.
       char * oauth_sign_xmpp (const char *xml, OAuthMethod method, const char *c_secret, const
           char *t_secret)
           xep-0235 - TODO
       char * oauth_http_get (const char *u, const char *q) attribute_deprecated
           do a HTTP GET request, wait for it to finish and return the content of the reply.
       char * oauth_http_get2 (const char *u, const char *q, const char *customheader)
           attribute_deprecated
           do a HTTP GET request, wait for it to finish and return the content of the reply.
       char * oauth_http_post (const char *u, const char *p) attribute_deprecated
           do a HTTP POST request, wait for it to finish and return the content of the reply.
       char * oauth_http_post2 (const char *u, const char *p, const char *customheader)
           attribute_deprecated
           do a HTTP POST request, wait for it to finish and return the content of the reply.
       char * oauth_post_file (const char *u, const char *fn, const size_t len, const char
           *customheader) attribute_deprecated
           http post raw data from file.
       char * oauth_post_data (const char *u, const char *data, size_t len, const char
           *customheader) attribute_deprecated
           http post raw data the returned string needs to be freed by the caller (requires
           libcurl)
       char * oauth_post_data_with_callback (const char *u, const char *data, size_t len, const
           char *customheader, void(*callback)(void *, int, size_t, size_t), void *callback_data)
           attribute_deprecated
           http post raw data, with callback.
       char * oauth_send_data (const char *u, const char *data, size_t len, const char
           *customheader, const char *httpMethod) attribute_deprecated
           http send raw data.
       char * oauth_send_data_with_callback (const char *u, const char *data, size_t len, const
           char *customheader, void(*callback)(void *, int, size_t, size_t), void *callback_data,
           const char *httpMethod) attribute_deprecated
           http post raw data, with callback.

Detailed Description

       OAuth.net implementation in POSIX-C.

       Author:
           Robin Gareus robin@gareus.org

       Copyright 2007-2012 Robin Gareus robin@gareus.org

       Permission is hereby granted, free of charge, to any person obtaining a copy of this
       software and associated documentation files (the 'Software'), to deal in the Software
       without restriction, including without limitation the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
       to whom the Software is furnished to do so, subject to the following conditions:

       The above copyright notice and this permission notice shall be included in all copies or
       substantial portions of the Software.

       THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
       INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
       PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
       FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
       OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
       DEALINGS IN THE SOFTWARE.

       Definition in file oauth.h.

Enumeration Type Documentation

   enum OAuthMethod
       signature method to used for signing the request.

       Enumerator:

       OA_HMAC
              use HMAC-SHA1 request signing method

       OA_RSA use RSA signature

       OA_PLAINTEXT
              use plain text signature (for testing only)

       Definition at line 66 of file oauth.h.

Function Documentation

   void oauth_add_param_to_array (int * argcp, char *** argvp, const char * addparam)
       add query parameter to array Parameters:
           argcp pointer to array length int
           argvp pointer to array values
           addparam parameter to add (eg. 'foo=bar')

   char* oauth_body_hash_data (size_t length, const char * data)
       calculate body hash (sha1sum) of given data and return a oauth_body_hash=xxxx parameter to
       be added to the request. The returned string needs to be freed by the calling function.
       The returned string is not yet url-escaped and suitable to be passed as argument to
       oauth_catenc.

       see http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html

       Parameters:
           length length of the data parameter in bytes
           data to calculate the hash for

       Returns:
           URL oauth_body_hash parameter string

       Examples:
           tests/oauthbodyhash.c.

   char* oauth_body_hash_encode (size_t len, unsigned char * digest)
       base64 encode digest, free it and return a URL parameter with the oauth_body_hash. The
       returned hash needs to be freed by the calling function. The returned string is not yet
       url-escaped and thus suitable to be passed to oauth_catenc.

       Parameters:
           len length of the digest to encode
           digest hash value to encode

       Returns:
           URL oauth_body_hash parameter string

   char* oauth_body_hash_file (char * filename)
       calculate body hash (sha1sum) of given file and return a oauth_body_hash=xxxx parameter to
       be added to the request. The returned string needs to be freed by the calling function.

       see http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html

       Parameters:
           filename the filename to calculate the hash for

       Returns:
           URL oauth_body_hash parameter string

       Examples:
           tests/oauthbodyhash.c.

   char* oauth_catenc (int len,  ...)
       url-escape strings and concatenate with '&' separator. The number of strings to be
       concatenated must be given as first argument. all arguments thereafter must be of type
       (char *)

       Parameters:
           len the number of arguments to follow this parameter

       Returns:
           pointer to memory holding the concatenated strings - needs to be free(d) by the
           caller. or NULL in case we ran out of memory.

   int oauth_cmpstringp (const void * p1, const void * p2)
       string compare function for oauth parameters. used with qsort. needed to normalize request
       parameters. see http://oauth.net/core/1.0/#anchor14

       Examples:
           tests/oauthexample.c, tests/oauthtest.c, and tests/oauthtest2.c.

   int oauth_decode_base64 (unsigned char * dest, const char * src)
       Decode the base64 encoded string 'src' into the memory pointed to by 'dest'. Parameters:
           dest Pointer to memory for holding the decoded string. Must be large enough to receive
           the decoded string.
           src A base64 encoded string.

       Returns:
           the length of the decoded string if decode succeeded otherwise 0.

   char* oauth_encode_base64 (int size, const unsigned char * src)
       Base64 encode and return size data in 'src'. The caller must free the returned string.

       Parameters:
           size The size of the data in src
           src The data to be base64 encode

       Returns:
           encoded string otherwise NULL

   void oauth_free_array (int * argcp, char *** argvp)
       free array args Parameters:
           argcp pointer to array length int
           argvp pointer to array values to be free()d

       Examples:
           tests/oauthtest2.c.

   char* oauth_gen_nonce ()
       generate a random string between 15 and 32 chars length and return a pointer to it. The
       value needs to be freed by the caller

       Returns:
           zero terminated random string.

   char* oauth_http_get (const char * u, const char * q)
       do a HTTP GET request, wait for it to finish and return the content of the reply.
       (requires libcurl or a command-line HTTP client)

       If compiled without libcurl this function calls a command-line executable defined in the
       environment variable OAUTH_HTTP_GET_CMD - it defaults to curl -sA 'liboauth-agent/0.1'
       '%u' where %u is replaced with the URL and query parameters.

       bash & wget example: export OAUTH_HTTP_CMD='wget -q -U 'liboauth-agent/0.1' '%u' '

       WARNING: this is a tentative function. it's convenient and handy for testing or developing
       OAuth code. But don't rely on this function to become a stable part of this API. It does
       not do much error checking or handling for one thing..

       NOTE: u and q are just concatenated with a '?' in between, unless q is NULL. in which case
       only u will be used.

       Parameters:
           u base url to get
           q query string to send along with the HTTP request or NULL.

       Returns:
           In case of an error NULL is returned; otherwise a pointer to the replied content from
           HTTP server. latter needs to be freed by caller.

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

       Examples:
           tests/oauthexample.c, and tests/oauthtest.c.

   char* oauth_http_get2 (const char * u, const char * q, const char * customheader)
       do a HTTP GET request, wait for it to finish and return the content of the reply.
       (requires libcurl)

       This is equivalent to /ref oauth_http_get but allows one to specifiy a custom HTTP header
       and has has no support for commandline-curl.

       If liboauth is compiled without libcurl this function always returns NULL.

       Parameters:
           u base url to get
           q query string to send along with the HTTP request or NULL.
           customheader specify custom HTTP header (or NULL for none) Multiple header elements
           can be passed separating them with '\r\n'

       Returns:
           In case of an error NULL is returned; otherwise a pointer to the replied content from
           HTTP server. latter needs to be freed by caller.

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

       Examples:
           tests/oauthtest2.c.

   char* oauth_http_post (const char * u, const char * p)
       do a HTTP POST request, wait for it to finish and return the content of the reply.
       (requires libcurl or a command-line HTTP client)

       If compiled without libcurl this function calls a command-line executable defined in the
       environment variable OAUTH_HTTP_CMD - it defaults to curl -sA 'liboauth-agent/0.1' -d '%p'
       '%u' where %p is replaced with the postargs and %u is replaced with the URL.

       bash & wget example: export OAUTH_HTTP_CMD='wget -q -U 'liboauth-agent/0.1' –post-
       data='%p' '%u' '

       NOTE: This function uses the curl's default HTTP-POST Content-Type: application/x-www-
       form-urlencoded which is the only option allowed by oauth core 1.0 spec. Experimental code
       can use the Environment variable to transmit custom HTTP headers or parameters.

       WARNING: this is a tentative function. it's convenient and handy for testing or developing
       OAuth code. But don't rely on this function to become a stable part of this API. It does
       not do much error checking for one thing..

       Parameters:
           u url to query
           p postargs to send along with the HTTP request.

       Returns:
           replied content from HTTP server. needs to be freed by caller.

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

       Examples:
           tests/oauthexample.c, and tests/oauthtest.c.

   char* oauth_http_post2 (const char * u, const char * p, const char * customheader)
       do a HTTP POST request, wait for it to finish and return the content of the reply.
       (requires libcurl)

       It's equivalent to /ref oauth_http_post, but offers the possibility to specify a custom
       HTTP header and has no support for commandline-curl.

       If liboauth is compiled without libcurl this function always returns NULL.

       Parameters:
           u url to query
           p postargs to send along with the HTTP request.
           customheader specify custom HTTP header (or NULL for none) Multiple header elements
           can be passed separating them with '\r\n'

       Returns:
           replied content from HTTP server. needs to be freed by caller.

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

   int oauth_param_exists (char ** argv, int argc, char * key)
       search array for parameter key. Parameters:
           argv length of array to search
           argc parameter array to search
           key key of parameter to check.

       Returns:
           FALSE (0) if array does not contain a parameter with given key, TRUE (1) otherwise.

   char* oauth_post_data (const char * u, const char * data, size_t len, const char *
       customheader)
       http post raw data the returned string needs to be freed by the caller (requires libcurl)
       see dislaimer: /ref oauth_http_post

       Parameters:
           u url to retrieve
           data data to post
           len length of the data in bytes.
           customheader specify custom HTTP header (or NULL for default) Multiple header elements
           can be passed separating them with '\r\n'

       Returns:
           returned HTTP reply or NULL on error

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

       Examples:
           tests/oauthbodyhash.c.

   char* oauth_post_data_with_callback (const char * u, const char * data, size_t len, const char
       * customheader, void(*)(void *, int, size_t, size_t) callback, void * callback_data)
       http post raw data, with callback. the returned string needs to be freed by the caller
       (requires libcurl)

       Invokes the callback - in no particular order - when HTTP-request status updates occur.
       The callback is called with: void * callback_data: supplied on function call. int type:
       0=data received, 1=data sent. size_t size: amount of data received or amount of data sent
       so far size_t totalsize: original amount of data to send, or amount of data received

       Parameters:
           u url to retrieve
           data data to post along
           len length of the file in bytes. set to '0' for autodetection
           customheader specify custom HTTP header (or NULL for default) Multiple header elements
           can be passed separating them with '\r\n'
           callback specify the callback function
           callback_data specify data to pass to the callback function

       Returns:
           returned HTTP reply or NULL on error

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

   char* oauth_post_file (const char * u, const char * fn, const size_t len, const char *
       customheader)
       http post raw data from file. the returned string needs to be freed by the caller
       (requires libcurl)

       see dislaimer: /ref oauth_http_post

       Parameters:
           u url to retrieve
           fn filename of the file to post along
           len length of the file in bytes. set to '0' for autodetection
           customheader specify custom HTTP header (or NULL for default). Multiple header
           elements can be passed separating them with '\r\n'

       Returns:
           returned HTTP reply or NULL on error

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

   char* oauth_send_data (const char * u, const char * data, size_t len, const char *
       customheader, const char * httpMethod)
       http send raw data. similar to /ref oauth_http_post but provides for specifying the HTTP
       request method.

       the returned string needs to be freed by the caller (requires libcurl)

       see dislaimer: /ref oauth_http_post

       Parameters:
           u url to retrieve
           data data to post
           len length of the data in bytes.
           customheader specify custom HTTP header (or NULL for default) Multiple header elements
           can be passed separating them with '\r\n'
           httpMethod specify http verb ('GET'/'POST'/'PUT'/'DELETE') to be used. if httpMethod
           is NULL, a POST is executed.

       Returns:
           returned HTTP reply or NULL on error

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

   char* oauth_send_data_with_callback (const char * u, const char * data, size_t len, const char
       * customheader, void(*)(void *, int, size_t, size_t) callback, void * callback_data, const
       char * httpMethod)
       http post raw data, with callback. the returned string needs to be freed by the caller
       (requires libcurl)

       Invokes the callback - in no particular order - when HTTP-request status updates occur.
       The callback is called with: void * callback_data: supplied on function call. int type:
       0=data received, 1=data sent. size_t size: amount of data received or amount of data sent
       so far size_t totalsize: original amount of data to send, or amount of data received

       Parameters:
           u url to retrieve
           data data to post along
           len length of the file in bytes. set to '0' for autodetection
           customheader specify custom HTTP header (or NULL for default) Multiple header elements
           can be passed separating them with '\r\n'
           callback specify the callback function
           callback_data specify data to pass to the callback function
           httpMethod specify http verb ('GET'/'POST'/'PUT'/'DELETE') to be used.

       Returns:
           returned HTTP reply or NULL on error

       Deprecated
           use libcurl - http://curl.haxx.se/libcurl/c/

   char* oauth_serialize_url (int argc, int start, char ** argv)
       build a url query string from an array. Parameters:
           argc the total number of elements in the array
           start element in the array at which to start concatenating.
           argv parameter-array to concatenate.

       Returns:
           url string needs to be freed by the caller.

   char* oauth_serialize_url_parameters (int argc, char ** argv)
       build a query parameter string from an array. This function is a shortcut for
       oauth_serialize_url (argc, 1, argv). It strips the leading host/path, which is usually the
       first element when using oauth_split_url_parameters on an URL.

       Parameters:
           argc the total number of elements in the array
           argv parameter-array to concatenate.

       Returns:
           url string needs to be freed by the caller.

   char* oauth_serialize_url_sep (int argc, int start, char ** argv, char * sep, int mod)
       encode query parameters from an array. Parameters:
           argc the total number of elements in the array
           start element in the array at which to start concatenating.
           argv parameter-array to concatenate.
           sep separator for parameters (usually '&')
           mod - bitwise modifiers: 1: skip all values that start with 'oauth_' 2: skip all
           values that don't start with 'oauth_' 4: double quotation marks are added around
           values (use with sep ', ' for HTTP Authorization header).

       Returns:
           url string needs to be freed by the caller.

       Examples:
           tests/oauthtest2.c.

   char* oauth_sign_array (int * argcp, char *** argvp, char ** postargs, OAuthMethod method,
       const char * c_key, const char * c_secret, const char * t_key, const char * t_secret)
       Deprecated
           Use oauth_sign_array2() instead.

   char* oauth_sign_array2 (int * argcp, char *** argvp, char ** postargs, OAuthMethod method,
       const char * http_method, const char * c_key, const char * c_secret, const char * t_key,
       const char * t_secret)
       same as /ref oauth_sign_url with the url already split into parameter array Parameters:
           argcp pointer to array length int
           argvp pointer to array values (argv[0]='http://example.org:80/'
           argv[1]='first=QueryParamater' .. the array is modified: fi. oauth_ parameters are
           added) These arrays can be generated with /ref oauth_split_url_parameters or /ref
           oauth_split_post_paramters.
           postargs This parameter points to an area where the return value is stored. If
           'postargs' is NULL, no value is stored.
           method specify the signature method to use. It is of type OAuthMethod and most likely
           OA_HMAC.
           http_method The HTTP request method to use (ie 'GET', 'PUT',..) If NULL is given as
           'http_method' this defaults to 'GET' when 'postargs' is also NULL and when postargs is
           not NULL 'POST' is used.
           c_key consumer key
           c_secret consumer secret
           t_key token key
           t_secret token secret

       Returns:
           the signed url or NULL if an error occurred.

   void oauth_sign_array2_process (int * argcp, char *** argvp, char ** postargs, OAuthMethod
       method, const char * http_method, const char * c_key, const char * c_secret, const char *
       t_key, const char * t_secret)
       the back-end behind by /ref oauth_sign_array2. however it does not serialize the signed
       URL again. The user needs to call /ref oauth_serialize_url (oA) and /ref oauth_free_array
       to do so.

       This allows one to split parts of the URL to be used for OAuth HTTP Authorization header:
       see http://oauth.net/core/1.0a/#consumer_req_param the oauthtest2 example code does so.

       Parameters:
           argcp pointer to array length int
           argvp pointer to array values (argv[0]='http://example.org:80/'
           argv[1]='first=QueryParamater' .. the array is modified: fi. oauth_ parameters are
           added) These arrays can be generated with /ref oauth_split_url_parameters or /ref
           oauth_split_post_paramters.
           postargs This parameter points to an area where the return value is stored. If
           'postargs' is NULL, no value is stored.
           method specify the signature method to use. It is of type OAuthMethod and most likely
           OA_HMAC.
           http_method The HTTP request method to use (ie 'GET', 'PUT',..) If NULL is given as
           'http_method' this defaults to 'GET' when 'postargs' is also NULL and when postargs is
           not NULL 'POST' is used.
           c_key consumer key
           c_secret consumer secret
           t_key token key
           t_secret token secret

       Returns:
           void

       Examples:
           tests/oauthtest2.c.

   char* oauth_sign_hmac_sha1 (const char * m, const char * k)
       returns base64 encoded HMAC-SHA1 signature for given message and key. both data and key
       need to be urlencoded.

       the returned string needs to be freed by the caller

       Parameters:
           m message to be signed
           k key used for signing

       Returns:
           signature string.

       Examples:
           tests/selftest_wiki.c.

   char* oauth_sign_hmac_sha1_raw (const char * m, const size_t ml, const char * k, const size_t
       kl)
       same as oauth_sign_hmac_sha1 but allows one to specify length of message and key (in case
       they contain null chars). Parameters:
           m message to be signed
           ml length of message
           k key used for signing
           kl length of key

       Returns:
           signature string.

   char* oauth_sign_plaintext (const char * m, const char * k)
       returns plaintext signature for the given key. the returned string needs to be freed by
       the caller

       Parameters:
           m message to be signed
           k key used for signing

       Returns:
           signature string

   char* oauth_sign_rsa_sha1 (const char * m, const char * k)
       returns RSA-SHA1 signature for given data. the returned signature needs to be freed by the
       caller.

       Parameters:
           m message to be signed
           k private-key PKCS and Base64-encoded

       Returns:
           base64 encoded signature string.

       Examples:
           tests/selftest_wiki.c.

   char* oauth_sign_url (const char * url, char ** postargs, OAuthMethod method, const char *
       c_key, const char * c_secret, const char * t_key, const char * t_secret)
       Deprecated
           Use oauth_sign_url2() instead.

   char* oauth_sign_url2 (const char * url, char ** postargs, OAuthMethod method, const char *
       http_method, const char * c_key, const char * c_secret, const char * t_key, const char *
       t_secret)
       calculate OAuth-signature for a given HTTP request URL, parameters and oauth-tokens. if
       'postargs' is NULL a 'GET' request is signed and the signed URL is returned. Else this fn
       will modify 'postargs' to point to memory that contains the signed POST-variables and
       returns the base URL.

       both, the return value and (if given) 'postargs' need to be freed by the caller.

       Parameters:
           url The request URL to be signed. append all GET or POST query-parameters separated by
           either '?' or '&' to this parameter.
           postargs This parameter points to an area where the return value is stored. If
           'postargs' is NULL, no value is stored.
           method specify the signature method to use. It is of type OAuthMethod and most likely
           OA_HMAC.
           http_method The HTTP request method to use (ie 'GET', 'PUT',..) If NULL is given as
           'http_method' this defaults to 'GET' when 'postargs' is also NULL and when postargs is
           not NULL 'POST' is used.
           c_key consumer key
           c_secret consumer secret
           t_key token key
           t_secret token secret

       Returns:
           the signed url or NULL if an error occurred.

       Examples:
           tests/oauthbodyhash.c, tests/oauthexample.c, and tests/oauthtest.c.

   char* oauth_sign_xmpp (const char * xml, OAuthMethod method, const char * c_secret, const char
       * t_secret)
       xep-0235 - TODO

   int oauth_split_post_paramters (const char * url, char *** argv, short qesc)
       splits the given url into a parameter array. (see oauth_serialize_url and
       oauth_serialize_url_parameters for the reverse)

       Parameters:
           url the url or query-string to parse.
           argv pointer to a (char *) array where the results are stored. The array is re-
           allocated to match the number of parameters and each parameter-string is allocated
           with strdup. - The memory needs to be freed by the caller.
           qesc use query parameter escape (vs post-param-escape) - if set to 1 all '+' are
           treated as spaces ' '

       Returns:
           number of parameter(s) in array.

   int oauth_split_url_parameters (const char * url, char *** argv)
       splits the given url into a parameter array. (see oauth_serialize_url and
       oauth_serialize_url_parameters for the reverse) (see oauth_split_post_paramters for a more
       generic version)

       Parameters:
           url the url or query-string to parse; may be NULL
           argv pointer to a (char *) array where the results are stored. The array is re-
           allocated to match the number of parameters and each parameter-string is allocated
           with strdup. - The memory needs to be freed by the caller.

       Returns:
           number of parameter(s) in array.

       Examples:
           tests/oauthexample.c, tests/oauthtest.c, and tests/oauthtest2.c.

   int oauth_time_independent_equals (const char * a, const char * b)
       compare two strings in constant-time. wrapper to oauth_time_independent_equals_n which
       calls strlen() for each argument.

       Parameters:
           a string to compare
           b string to compare

       returns 0 (false) if strings are not equal, and 1 (true) if strings are equal.

   int oauth_time_independent_equals_n (const char * a, const char * b, size_t len_a, size_t
       len_b)
       compare two strings in constant-time (as to not let an attacker guess how many leading
       chars are correct: http://rdist.root.org/2010/01/07/timing-independent-array-comparison/ )
       Parameters:
           a string to compare
           b string to compare
           len_a length of string a
           len_b length of string b

       returns 0 (false) if strings are not equal, and 1 (true) if strings are equal.

   int oauth_time_indepenent_equals (const char * a, const char * b)
       Deprecated
           Use oauth_time_independent_equals() instead.

   int oauth_time_indepenent_equals_n (const char * a, const char * b, size_t len_a, size_t
       len_b)
       Deprecated
           Use oauth_time_independent_equals_n() instead.

   char* oauth_url_escape (const char * string)
       Escape 'string' according to RFC3986 and http://oauth.net/core/1.0/#encoding_parameters.
       Parameters:
           string The data to be encoded

       Returns:
           encoded string otherwise NULL The caller must free the returned string.

   char* oauth_url_unescape (const char * string, size_t * olen)
       Parse RFC3986 encoded 'string' back to unescaped version. Parameters:
           string The data to be unescaped
           olen unless NULL the length of the returned string is stored there.

       Returns:
           decoded string or NULL The caller must free the returned string.

   int oauth_verify_rsa_sha1 (const char * m, const char * c, const char * s)
       verify RSA-SHA1 signature. returns the output of EVP_VerifyFinal() for a given message,
       cert/pubkey and signature.

       Parameters:
           m message to be verified
           c public-key or x509 certificate
           s base64 encoded signature

       Returns:
           1 for a correct signature, 0 for failure and -1 if some other error occurred

       Examples:
           tests/selftest_wiki.c.

Author

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