/src/botan/src/lib/tls/tls_algos.cpp

Source (jump to first uncovered line)
/*
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/tls_algos.h>
#include <botan/exceptn.h>

namespace Botan {

namespace TLS {

std::string kdf_algo_to_string(KDF_Algo algo)
   {
   switch(algo)
      {
      case KDF_Algo::SHA_1:
         return "SHA-1";
      case KDF_Algo::SHA_256:
         return "SHA-256";
      case KDF_Algo::SHA_384:
         return "SHA-384";
      }

   throw Invalid_State("kdf_algo_to_string unknown enum value");
   }

std::string kex_method_to_string(Kex_Algo method)
   {
   switch(method)
      {
      case Kex_Algo::STATIC_RSA:
         return "RSA";
      case Kex_Algo::DH:
         return "DH";
      case Kex_Algo::ECDH:
         return "ECDH";
      case Kex_Algo::CECPQ1:
         return "CECPQ1";
      case Kex_Algo::PSK:
         return "PSK";
      case Kex_Algo::ECDHE_PSK:
         return "ECDHE_PSK";
      }

   throw Invalid_State("kex_method_to_string unknown enum value");
   }

Kex_Algo kex_method_from_string(const std::string& str)
   {
   if(str == "RSA")
      return Kex_Algo::STATIC_RSA;

   if(str == "DH")
      return Kex_Algo::DH;

   if(str == "ECDH")
      return Kex_Algo::ECDH;

   if(str == "CECPQ1")
      return Kex_Algo::CECPQ1;

   if(str == "PSK")
      return Kex_Algo::PSK;

   if(str == "ECDHE_PSK")
      return Kex_Algo::ECDHE_PSK;

   throw Invalid_Argument("Unknown kex method " + str);
   }

std::string auth_method_to_string(Auth_Method method)
   {
   switch(method)
      {
      case Auth_Method::RSA:
         return "RSA";
      case Auth_Method::ECDSA:
         return "ECDSA";
      case Auth_Method::IMPLICIT:
         return "IMPLICIT";
      }

    throw Invalid_State("auth_method_to_string unknown enum value");
   }

Auth_Method auth_method_from_string(const std::string& str)
   {
   if(str == "RSA")
      return Auth_Method::RSA;
   if(str == "ECDSA")
      return Auth_Method::ECDSA;
   if(str == "IMPLICIT")
      return Auth_Method::IMPLICIT;

   throw Invalid_Argument("Bad signature method " + str);
   }

bool group_param_is_dh(Group_Params group)
   {
   uint16_t group_id = static_cast<uint16_t>(group);
   return (group_id >= 256 && group_id < 512);
   }

Group_Params group_param_from_string(const std::string& group_name)
   {
   if(group_name == "secp256r1")
      return Group_Params::SECP256R1;
   if(group_name == "secp384r1")
      return Group_Params::SECP384R1;
   if(group_name == "secp521r1")
      return Group_Params::SECP521R1;
   if(group_name == "brainpool256r1")
      return Group_Params::BRAINPOOL256R1;
   if(group_name == "brainpool384r1")
      return Group_Params::BRAINPOOL384R1;
   if(group_name == "brainpool512r1")
      return Group_Params::BRAINPOOL512R1;
   if(group_name == "x25519")
      return Group_Params::X25519;

   if(group_name == "ffdhe/ietf/2048")
      return Group_Params::FFDHE_2048;
   if(group_name == "ffdhe/ietf/3072")
      return Group_Params::FFDHE_3072;
   if(group_name == "ffdhe/ietf/4096")
      return Group_Params::FFDHE_4096;
   if(group_name == "ffdhe/ietf/6144")
      return Group_Params::FFDHE_6144;
   if(group_name == "ffdhe/ietf/8192")
      return Group_Params::FFDHE_8192;

   return Group_Params::NONE; // unknown
   }

std::string group_param_to_string(Group_Params group)
   {
   switch(group)
      {
      case Group_Params::SECP256R1:
         return "secp256r1";
      case Group_Params::SECP384R1:
         return "secp384r1";
      case Group_Params::SECP521R1:
         return "secp521r1";
      case Group_Params::BRAINPOOL256R1:
         return "brainpool256r1";
      case Group_Params::BRAINPOOL384R1:
         return "brainpool384r1";
      case Group_Params::BRAINPOOL512R1:
         return "brainpool512r1";
      case Group_Params::X25519:
         return "x25519";

      case Group_Params::FFDHE_2048:
         return "ffdhe/ietf/2048";
      case Group_Params::FFDHE_3072:
         return "ffdhe/ietf/3072";
      case Group_Params::FFDHE_4096:
         return "ffdhe/ietf/4096";
      case Group_Params::FFDHE_6144:
         return "ffdhe/ietf/6144";
      case Group_Params::FFDHE_8192:
         return "ffdhe/ietf/8192";

      default:
         return "";
      }
   }


std::string hash_function_of_scheme(Signature_Scheme scheme)
   {
   switch(scheme)
      {
      case Signature_Scheme::ECDSA_SHA256:
      case Signature_Scheme::RSA_PKCS1_SHA256:
      case Signature_Scheme::RSA_PSS_SHA256:
         return "SHA-256";

      case Signature_Scheme::ECDSA_SHA384:
      case Signature_Scheme::RSA_PKCS1_SHA384:
      case Signature_Scheme::RSA_PSS_SHA384:
         return "SHA-384";

      case Signature_Scheme::ECDSA_SHA512:
      case Signature_Scheme::RSA_PKCS1_SHA512:
      case Signature_Scheme::RSA_PSS_SHA512:
         return "SHA-512";

      case Signature_Scheme::EDDSA_25519:
      case Signature_Scheme::EDDSA_448:
         return "Pure";

      case Signature_Scheme::NONE:
         return "";
      }

   throw Invalid_State("hash_function_of_scheme: Unknown signature algorithm enum");
   }

const std::vector<Signature_Scheme>& all_signature_schemes()
   {
   /*
   * This is ordered in some approximate order of preference
   */
   static const std::vector<Signature_Scheme> all_schemes = {
      //Signature_Scheme::EDDSA_448,
      //Signature_Scheme::EDDSA_25519,

      Signature_Scheme::RSA_PSS_SHA384,
      Signature_Scheme::RSA_PSS_SHA256,
      Signature_Scheme::RSA_PSS_SHA512,

      Signature_Scheme::RSA_PKCS1_SHA384,
      Signature_Scheme::RSA_PKCS1_SHA512,
      Signature_Scheme::RSA_PKCS1_SHA256,

      Signature_Scheme::ECDSA_SHA384,
      Signature_Scheme::ECDSA_SHA512,
      Signature_Scheme::ECDSA_SHA256,
   };

   return all_schemes;
   }

bool signature_scheme_is_known(Signature_Scheme scheme)
   {
   switch(scheme)
      {
      case Signature_Scheme::RSA_PKCS1_SHA256:
      case Signature_Scheme::RSA_PKCS1_SHA384:
      case Signature_Scheme::RSA_PKCS1_SHA512:
      case Signature_Scheme::RSA_PSS_SHA256:
      case Signature_Scheme::RSA_PSS_SHA384:
      case Signature_Scheme::RSA_PSS_SHA512:

      case Signature_Scheme::ECDSA_SHA256:
      case Signature_Scheme::ECDSA_SHA384:
      case Signature_Scheme::ECDSA_SHA512:
         return true;

      default:
         return false;
      }

   }

std::string signature_algorithm_of_scheme(Signature_Scheme scheme)
   {
   switch(scheme)
      {
      case Signature_Scheme::RSA_PKCS1_SHA256:
      case Signature_Scheme::RSA_PKCS1_SHA384:
      case Signature_Scheme::RSA_PKCS1_SHA512:
      case Signature_Scheme::RSA_PSS_SHA256:
      case Signature_Scheme::RSA_PSS_SHA384:
      case Signature_Scheme::RSA_PSS_SHA512:
         return "RSA";

      case Signature_Scheme::ECDSA_SHA256:
      case Signature_Scheme::ECDSA_SHA384:
      case Signature_Scheme::ECDSA_SHA512:
         return "ECDSA";

      case Signature_Scheme::EDDSA_25519:
         return "Ed25519";

      case Signature_Scheme::EDDSA_448:
         return "Ed448";

      case Signature_Scheme::NONE:
         return "";
      }

   throw Invalid_State("signature_algorithm_of_scheme: Unknown signature algorithm enum");
   }

std::string sig_scheme_to_string(Signature_Scheme scheme)
   {
   switch(scheme)
      {
      case Signature_Scheme::RSA_PKCS1_SHA256:
         return "RSA_PKCS1_SHA256";
      case Signature_Scheme::RSA_PKCS1_SHA384:
         return "RSA_PKCS1_SHA384";
      case Signature_Scheme::RSA_PKCS1_SHA512:
         return "RSA_PKCS1_SHA512";

      case Signature_Scheme::ECDSA_SHA256:
         return "ECDSA_SHA256";
      case Signature_Scheme::ECDSA_SHA384:
         return "ECDSA_SHA384";
      case Signature_Scheme::ECDSA_SHA512:
         return "ECDSA_SHA512";

      case Signature_Scheme::RSA_PSS_SHA256:
         return "RSA_PSS_SHA256";
      case Signature_Scheme::RSA_PSS_SHA384:
         return "RSA_PSS_SHA384";
      case Signature_Scheme::RSA_PSS_SHA512:
         return "RSA_PSS_SHA512";

      case Signature_Scheme::EDDSA_25519:
         return "EDDSA_25519";
      case Signature_Scheme::EDDSA_448:
         return "EDDSA_448";

      case Signature_Scheme::NONE:
         return "";
      }

   throw Invalid_State("sig_scheme_to_string: Unknown signature algorithm enum");
   }

std::string padding_string_for_scheme(Signature_Scheme scheme)
   {
   switch(scheme)
      {
      case Signature_Scheme::RSA_PKCS1_SHA256:
         return "EMSA_PKCS1(SHA-256)";
      case Signature_Scheme::RSA_PKCS1_SHA384:
         return "EMSA_PKCS1(SHA-384)";
      case Signature_Scheme::RSA_PKCS1_SHA512:
         return "EMSA_PKCS1(SHA-512)";

      case Signature_Scheme::ECDSA_SHA256:
         return "EMSA1(SHA-256)";
      case Signature_Scheme::ECDSA_SHA384:
         return "EMSA1(SHA-384)";
      case Signature_Scheme::ECDSA_SHA512:
         return "EMSA1(SHA-512)";

      case Signature_Scheme::RSA_PSS_SHA256:
         return "PSSR(SHA-256,MGF1,32)";
      case Signature_Scheme::RSA_PSS_SHA384:
         return "PSSR(SHA-384,MGF1,48)";
      case Signature_Scheme::RSA_PSS_SHA512:
         return "PSSR(SHA-512,MGF1,64)";

      case Signature_Scheme::EDDSA_25519:
         return "Pure";
      case Signature_Scheme::EDDSA_448:
         return "Pure";

      case Signature_Scheme::NONE:
         return "";
      }

   throw Invalid_State("padding_string_for_scheme: Unknown signature algorithm enum");
   }

}

}

Coverage Report

Created: 2021-02-21 07:20

Line	Count	Source (jump to first uncovered line)
1		/*
2		* (C) 2017 Jack Lloyd
3		*
4		* Botan is released under the Simplified BSD License (see license.txt)
5		*/
6
7		#include <botan/tls_algos.h>
8		#include <botan/exceptn.h>
9
10		namespace Botan {
11
12		namespace TLS {
13
14		std::string kdf_algo_to_string(KDF_Algo algo)
15	14.7k	{
16	14.7k	switch(algo)
17	14.7k	{
18	2.87k	case KDF_Algo::SHA_1:
19	2.87k	return "SHA-1";
20	7.41k	case KDF_Algo::SHA_256:
21	7.41k	return "SHA-256";
22	4.43k	case KDF_Algo::SHA_384:
23	4.43k	return "SHA-384";
24	0	}
25
26	0	throw Invalid_State("kdf_algo_to_string unknown enum value");
27	0	}
28
29		std::string kex_method_to_string(Kex_Algo method)
30	0	{
31	0	switch(method)
32	0	{
33	0	case Kex_Algo::STATIC_RSA:
34	0	return "RSA";
35	0	case Kex_Algo::DH:
36	0	return "DH";
37	0	case Kex_Algo::ECDH:
38	0	return "ECDH";
39	0	case Kex_Algo::CECPQ1:
40	0	return "CECPQ1";
41	0	case Kex_Algo::PSK:
42	0	return "PSK";
43	0	case Kex_Algo::ECDHE_PSK:
44	0	return "ECDHE_PSK";
45	0	}
46
47	0	throw Invalid_State("kex_method_to_string unknown enum value");
48	0	}
49
50		Kex_Algo kex_method_from_string(const std::string& str)
51	0	{
52	0	if(str == "RSA")
53	0	return Kex_Algo::STATIC_RSA;
54
55	0	if(str == "DH")
56	0	return Kex_Algo::DH;
57
58	0	if(str == "ECDH")
59	0	return Kex_Algo::ECDH;
60
61	0	if(str == "CECPQ1")
62	0	return Kex_Algo::CECPQ1;
63
64	0	if(str == "PSK")
65	0	return Kex_Algo::PSK;
66
67	0	if(str == "ECDHE_PSK")
68	0	return Kex_Algo::ECDHE_PSK;
69
70	0	throw Invalid_Argument("Unknown kex method " + str);
71	0	}
72
73		std::string auth_method_to_string(Auth_Method method)
74	1.52k	{
75	1.52k	switch(method)
76	1.52k	{
77	969	case Auth_Method::RSA:
78	969	return "RSA";
79	560	case Auth_Method::ECDSA:
80	560	return "ECDSA";
81	0	case Auth_Method::IMPLICIT:
82	0	return "IMPLICIT";
83	0	}
84
85	0	throw Invalid_State("auth_method_to_string unknown enum value");
86	0	}
87
88		Auth_Method auth_method_from_string(const std::string& str)
89	0	{
90	0	if(str == "RSA")
91	0	return Auth_Method::RSA;
92	0	if(str == "ECDSA")
93	0	return Auth_Method::ECDSA;
94	0	if(str == "IMPLICIT")
95	0	return Auth_Method::IMPLICIT;
96
97	0	throw Invalid_Argument("Bad signature method " + str);
98	0	}
99
100		bool group_param_is_dh(Group_Params group)
101	248k	{
102	248k	uint16_t group_id = static_cast<uint16_t>(group);
103	248k	return (group_id >= 256 && group_id < 512);
104	248k	}
105
106		Group_Params group_param_from_string(const std::string& group_name)
107	0	{
108	0	if(group_name == "secp256r1")
109	0	return Group_Params::SECP256R1;
110	0	if(group_name == "secp384r1")
111	0	return Group_Params::SECP384R1;
112	0	if(group_name == "secp521r1")
113	0	return Group_Params::SECP521R1;
114	0	if(group_name == "brainpool256r1")
115	0	return Group_Params::BRAINPOOL256R1;
116	0	if(group_name == "brainpool384r1")
117	0	return Group_Params::BRAINPOOL384R1;
118	0	if(group_name == "brainpool512r1")
119	0	return Group_Params::BRAINPOOL512R1;
120	0	if(group_name == "x25519")
121	0	return Group_Params::X25519;
122
123	0	if(group_name == "ffdhe/ietf/2048")
124	0	return Group_Params::FFDHE_2048;
125	0	if(group_name == "ffdhe/ietf/3072")
126	0	return Group_Params::FFDHE_3072;
127	0	if(group_name == "ffdhe/ietf/4096")
128	0	return Group_Params::FFDHE_4096;
129	0	if(group_name == "ffdhe/ietf/6144")
130	0	return Group_Params::FFDHE_6144;
131	0	if(group_name == "ffdhe/ietf/8192")
132	0	return Group_Params::FFDHE_8192;
133
134	0	return Group_Params::NONE; // unknown
135	0	}
136
137		std::string group_param_to_string(Group_Params group)
138	21.0k	{
139	21.0k	switch(group)
140	21.0k	{
141	1.59k	case Group_Params::SECP256R1:
142	1.59k	return "secp256r1";
143	2.14k	case Group_Params::SECP384R1:
144	2.14k	return "secp384r1";
145	10.4k	case Group_Params::SECP521R1:
146	10.4k	return "secp521r1";
147	1.59k	case Group_Params::BRAINPOOL256R1:
148	1.59k	return "brainpool256r1";
149	1.64k	case Group_Params::BRAINPOOL384R1:
150	1.64k	return "brainpool384r1";
151	3.60k	case Group_Params::BRAINPOOL512R1:
152	3.60k	return "brainpool512r1";
153	11	case Group_Params::X25519:
154	11	return "x25519";
155
156	2	case Group_Params::FFDHE_2048:
157	2	return "ffdhe/ietf/2048";
158	1	case Group_Params::FFDHE_3072:
159	1	return "ffdhe/ietf/3072";
160	1	case Group_Params::FFDHE_4096:
161	1	return "ffdhe/ietf/4096";
162	1	case Group_Params::FFDHE_6144:
163	1	return "ffdhe/ietf/6144";
164	1	case Group_Params::FFDHE_8192:
165	1	return "ffdhe/ietf/8192";
166
167	1	default:
168	1	return "";
169	21.0k	}
170	21.0k	}
171
172
173		std::string hash_function_of_scheme(Signature_Scheme scheme)
174	59.1k	{
175	59.1k	switch(scheme)
176	59.1k	{
177	6.53k	case Signature_Scheme::ECDSA_SHA256:
178	13.1k	case Signature_Scheme::RSA_PKCS1_SHA256:
179	19.7k	case Signature_Scheme::RSA_PSS_SHA256:
180	19.7k	return "SHA-256";
181
182	6.58k	case Signature_Scheme::ECDSA_SHA384:
183	13.2k	case Signature_Scheme::RSA_PKCS1_SHA384:
184	19.8k	case Signature_Scheme::RSA_PSS_SHA384:
185	19.8k	return "SHA-384";
186
187	6.46k	case Signature_Scheme::ECDSA_SHA512:
188	13.0k	case Signature_Scheme::RSA_PKCS1_SHA512:
189	19.5k	case Signature_Scheme::RSA_PSS_SHA512:
190	19.5k	return "SHA-512";
191
192	0	case Signature_Scheme::EDDSA_25519:
193	0	case Signature_Scheme::EDDSA_448:
194	0	return "Pure";
195
196	0	case Signature_Scheme::NONE:
197	0	return "";
198	0	}
199
200	0	throw Invalid_State("hash_function_of_scheme: Unknown signature algorithm enum");
201	0	}
202
203		const std::vector<Signature_Scheme>& all_signature_schemes()
204	6.31k	{
205		/*
206		* This is ordered in some approximate order of preference
207		*/
208	6.31k	static const std::vector<Signature_Scheme> all_schemes = {
209		//Signature_Scheme::EDDSA_448,
210		//Signature_Scheme::EDDSA_25519,
211
212	6.31k	Signature_Scheme::RSA_PSS_SHA384,
213	6.31k	Signature_Scheme::RSA_PSS_SHA256,
214	6.31k	Signature_Scheme::RSA_PSS_SHA512,
215
216	6.31k	Signature_Scheme::RSA_PKCS1_SHA384,
217	6.31k	Signature_Scheme::RSA_PKCS1_SHA512,
218	6.31k	Signature_Scheme::RSA_PKCS1_SHA256,
219
220	6.31k	Signature_Scheme::ECDSA_SHA384,
221	6.31k	Signature_Scheme::ECDSA_SHA512,
222	6.31k	Signature_Scheme::ECDSA_SHA256,
223	6.31k	};
224
225	6.31k	return all_schemes;
226	6.31k	}
227
228		bool signature_scheme_is_known(Signature_Scheme scheme)
229	62.8k	{
230	62.8k	switch(scheme)
231	62.8k	{
232	6.63k	case Signature_Scheme::RSA_PKCS1_SHA256:
233	13.2k	case Signature_Scheme::RSA_PKCS1_SHA384:
234	19.8k	case Signature_Scheme::RSA_PKCS1_SHA512:
235	26.4k	case Signature_Scheme::RSA_PSS_SHA256:
236	32.9k	case Signature_Scheme::RSA_PSS_SHA384:
237	39.5k	case Signature_Scheme::RSA_PSS_SHA512:
238
239	46.1k	case Signature_Scheme::ECDSA_SHA256:
240	52.7k	case Signature_Scheme::ECDSA_SHA384:
241	59.2k	case Signature_Scheme::ECDSA_SHA512:
242	59.2k	return true;
243
244	3.60k	default:
245	3.60k	return false;
246	62.8k	}
247
248	62.8k	}
249
250		std::string signature_algorithm_of_scheme(Signature_Scheme scheme)
251	58.2k	{
252	58.2k	switch(scheme)
253	58.2k	{
254	6.54k	case Signature_Scheme::RSA_PKCS1_SHA256:
255	13.0k	case Signature_Scheme::RSA_PKCS1_SHA384:
256	19.4k	case Signature_Scheme::RSA_PKCS1_SHA512:
257	25.9k	case Signature_Scheme::RSA_PSS_SHA256:
258	32.3k	case Signature_Scheme::RSA_PSS_SHA384:
259	38.7k	case Signature_Scheme::RSA_PSS_SHA512:
260	38.7k	return "RSA";
261
262	6.56k	case Signature_Scheme::ECDSA_SHA256:
263	13.0k	case Signature_Scheme::ECDSA_SHA384:
264	19.5k	case Signature_Scheme::ECDSA_SHA512:
265	19.5k	return "ECDSA";
266
267	1	case Signature_Scheme::EDDSA_25519:
268	1	return "Ed25519";
269
270	1	case Signature_Scheme::EDDSA_448:
271	1	return "Ed448";
272
273	0	case Signature_Scheme::NONE:
274	0	return "";
275	63	}
276
277	63	throw Invalid_State("signature_algorithm_of_scheme: Unknown signature algorithm enum");
278	63	}
279
280		std::string sig_scheme_to_string(Signature_Scheme scheme)
281	0	{
282	0	switch(scheme)
283	0	{
284	0	case Signature_Scheme::RSA_PKCS1_SHA256:
285	0	return "RSA_PKCS1_SHA256";
286	0	case Signature_Scheme::RSA_PKCS1_SHA384:
287	0	return "RSA_PKCS1_SHA384";
288	0	case Signature_Scheme::RSA_PKCS1_SHA512:
289	0	return "RSA_PKCS1_SHA512";
290
291	0	case Signature_Scheme::ECDSA_SHA256:
292	0	return "ECDSA_SHA256";
293	0	case Signature_Scheme::ECDSA_SHA384:
294	0	return "ECDSA_SHA384";
295	0	case Signature_Scheme::ECDSA_SHA512:
296	0	return "ECDSA_SHA512";
297
298	0	case Signature_Scheme::RSA_PSS_SHA256:
299	0	return "RSA_PSS_SHA256";
300	0	case Signature_Scheme::RSA_PSS_SHA384:
301	0	return "RSA_PSS_SHA384";
302	0	case Signature_Scheme::RSA_PSS_SHA512:
303	0	return "RSA_PSS_SHA512";
304
305	0	case Signature_Scheme::EDDSA_25519:
306	0	return "EDDSA_25519";
307	0	case Signature_Scheme::EDDSA_448:
308	0	return "EDDSA_448";
309
310	0	case Signature_Scheme::NONE:
311	0	return "";
312	0	}
313
314	0	throw Invalid_State("sig_scheme_to_string: Unknown signature algorithm enum");
315	0	}
316
317		std::string padding_string_for_scheme(Signature_Scheme scheme)
318	229	{
319	229	switch(scheme)
320	229	{
321	1	case Signature_Scheme::RSA_PKCS1_SHA256:
322	1	return "EMSA_PKCS1(SHA-256)";
323	2	case Signature_Scheme::RSA_PKCS1_SHA384:
324	2	return "EMSA_PKCS1(SHA-384)";
325	2	case Signature_Scheme::RSA_PKCS1_SHA512:
326	2	return "EMSA_PKCS1(SHA-512)";
327
328	110	case Signature_Scheme::ECDSA_SHA256:
329	110	return "EMSA1(SHA-256)";
330	68	case Signature_Scheme::ECDSA_SHA384:
331	68	return "EMSA1(SHA-384)";
332	20	case Signature_Scheme::ECDSA_SHA512:
333	20	return "EMSA1(SHA-512)";
334
335	8	case Signature_Scheme::RSA_PSS_SHA256:
336	8	return "PSSR(SHA-256,MGF1,32)";
337	8	case Signature_Scheme::RSA_PSS_SHA384:
338	8	return "PSSR(SHA-384,MGF1,48)";
339	10	case Signature_Scheme::RSA_PSS_SHA512:
340	10	return "PSSR(SHA-512,MGF1,64)";
341
342	0	case Signature_Scheme::EDDSA_25519:
343	0	return "Pure";
344	0	case Signature_Scheme::EDDSA_448:
345	0	return "Pure";
346
347	0	case Signature_Scheme::NONE:
348	0	return "";
349	0	}
350
351	0	throw Invalid_State("padding_string_for_scheme: Unknown signature algorithm enum");
352	0	}
353
354		}
355
356		}