Botan 2.19.1
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Botan::PKCS11::MechanismWrapper Class Referencefinal

#include <p11_mechanism.h>

Classes

union  MechanismParameters
 Holds the mechanism parameters for OAEP, PSS and ECDH. More...
 

Public Member Functions

Mechanismdata () const
 
 MechanismWrapper (MechanismType mechanism_type)
 
size_t padding_size () const
 
void set_ecdh_other_key (const uint8_t other_key[], size_t other_key_len)
 
void set_ecdh_salt (const uint8_t salt[], size_t salt_len)
 

Static Public Member Functions

static MechanismWrapper create_ecdh_mechanism (const std::string &params)
 
static MechanismWrapper create_ecdsa_mechanism (const std::string &hash)
 
static MechanismWrapper create_rsa_crypt_mechanism (const std::string &padding)
 
static MechanismWrapper create_rsa_sign_mechanism (const std::string &padding)
 

Detailed Description

Simple class to build and hold the data for a CK_MECHANISM struct for RSA (encryption/decryption, signature/verification) and EC (ECDSA signature/verification, ECDH key derivation).

Definition at line 26 of file p11_mechanism.h.

Constructor & Destructor Documentation

◆ MechanismWrapper()

Botan::PKCS11::MechanismWrapper::MechanismWrapper ( MechanismType  mechanism_type)
explicit
Parameters
mechanism_typethe CK_MECHANISM_TYPE for the mechanism field of the CK_MECHANISM struct

Definition at line 170 of file p11_mechanism.cpp.

171 : m_mechanism( { static_cast<CK_MECHANISM_TYPE>(mechanism_type), nullptr, 0 }), m_parameters(nullptr)
172 {}
CK_ULONG CK_MECHANISM_TYPE
Definition: pkcs11t.h:583

Referenced by create_ecdsa_mechanism().

Member Function Documentation

◆ create_ecdh_mechanism()

MechanismWrapper Botan::PKCS11::MechanismWrapper::create_ecdh_mechanism ( const std::string &  params)
static

Creates the CK_MECHANISM data for ECDH key derivation (CKM_ECDH1_DERIVE or CKM_ECDH1_COFACTOR_DERIVE)

Parameters
paramsspecifies the key derivation function to use. Supported KDFs are Raw and SHA-160 to SHA-512. Params can also include the string "Cofactor" if the cofactor key derivation mechanism should be used, for example "SHA-512,Cofactor"

Definition at line 240 of file p11_mechanism.cpp.

241 {
242 std::vector<std::string> param_parts = split_on(params, ',');
243
244 if(param_parts.empty() || param_parts.size() > 2)
245 throw Invalid_Argument("PKCS #11 ECDH key derivation bad params " + params);
246
247 const bool use_cofactor =
248 (param_parts[0] == "Cofactor") ||
249 (param_parts.size() == 2 && param_parts[1] == "Cofactor");
250
251 std::string kdf_name = (param_parts[0] == "Cofactor" ? param_parts[1] : param_parts[0]);
252 std::string hash = kdf_name;
253
254 if(kdf_name != "Raw")
255 {
256 SCAN_Name kdf_hash(kdf_name);
257
258 if(kdf_hash.arg_count() > 0)
259 {
260 hash = kdf_hash.arg(0);
261 }
262 }
263
264 auto kdf = EcdhHash.find(hash);
265 if(kdf == EcdhHash.end())
266 {
267 throw Lookup_Error("PKCS#11 ECDH key derivation does not support KDF " + kdf_name);
268 }
270 mech.m_parameters = std::make_shared<MechanismParameters>();
271 mech.m_parameters->ecdh_params.kdf = static_cast<CK_EC_KDF_TYPE>(kdf->second);
272 mech.m_mechanism.pParameter = mech.m_parameters.get();
273 mech.m_mechanism.ulParameterLen = sizeof(Ecdh1DeriveParams);
274 return mech;
275 }
MechanismWrapper(MechanismType mechanism_type)
CK_ECDH1_DERIVE_PARAMS Ecdh1DeriveParams
Definition: p11.h:852
std::vector< std::string > split_on(const std::string &str, char delim)
Definition: parsing.cpp:148
MechanismType hash
CK_ULONG CK_EC_KDF_TYPE
Definition: pkcs11t.h:1287

References Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_count(), Botan::PKCS11::Ecdh1CofactorDerive, Botan::PKCS11::Ecdh1Derive, hash, CK_MECHANISM::pParameter, Botan::split_on(), and CK_MECHANISM::ulParameterLen.

◆ create_ecdsa_mechanism()

MechanismWrapper Botan::PKCS11::MechanismWrapper::create_ecdsa_mechanism ( const std::string &  hash)
static

Creates the CK_MECHANISM data for ECDSA signature/verification

Parameters
hashthe hash algorithm used to hash the data to sign. supported hash functions are Raw and SHA-160 to SHA-512

Definition at line 223 of file p11_mechanism.cpp.

224 {
225 std::string hash_name = hash;
226
227 if(hash_name != "Raw")
228 {
229 hash_name = hash_for_emsa(hash);
230 }
231
232 auto mechanism_type = EcdsaHash.find(hash_name);
233 if(mechanism_type == EcdsaHash.end())
234 {
235 throw Lookup_Error("PKCS#11 ECDSA sign/verify does not support " + hash);
236 }
237 return MechanismWrapper(mechanism_type->second);
238 }
std::string hash_for_emsa(const std::string &algo_spec)
Definition: emsa.cpp:189

References hash, Botan::hash_for_emsa(), and MechanismWrapper().

◆ create_rsa_crypt_mechanism()

MechanismWrapper Botan::PKCS11::MechanismWrapper::create_rsa_crypt_mechanism ( const std::string &  padding)
static

Creates the CK_MECHANISM data for RSA encryption/decryption

Parameters
paddingsupported paddings are Raw (X.509), EME-PKCS1-v1_5 (PKCS#1 v1.5) and OAEP (PKCS#1 OAEP)

Definition at line 174 of file p11_mechanism.cpp.

175 {
176 auto mechanism_info_it = CryptMechanisms.find(padding);
177 if(mechanism_info_it == CryptMechanisms.end())
178 {
179 // at this point it would be possible to support additional configurations that are not predefined above by parsing `padding`
180 throw Lookup_Error("PKCS#11 RSA encrypt/decrypt does not support EME " + padding);
181 }
182 RSA_CryptMechanism mechanism_info = mechanism_info_it->second;
183
184 MechanismWrapper mech(mechanism_info.type);
185 if(mechanism_info.type == MechanismType::RsaPkcsOaep)
186 {
187 mech.m_parameters = std::make_shared<MechanismParameters>();
188 mech.m_parameters->oaep_params.hashAlg = static_cast<CK_MECHANISM_TYPE>(mechanism_info.hash);
189 mech.m_parameters->oaep_params.mgf = static_cast<CK_RSA_PKCS_MGF_TYPE>(mechanism_info.mgf);
190 mech.m_parameters->oaep_params.source = CKZ_DATA_SPECIFIED;
191 mech.m_parameters->oaep_params.pSourceData = nullptr;
192 mech.m_parameters->oaep_params.ulSourceDataLen = 0;
193 mech.m_mechanism.pParameter = mech.m_parameters.get();
194 mech.m_mechanism.ulParameterLen = sizeof(RsaPkcsOaepParams);
195 }
196 mech.m_padding_size = mechanism_info.padding_size;
197 return mech;
198 }
CK_RSA_PKCS_OAEP_PARAMS RsaPkcsOaepParams
Definition: p11.h:850
#define CKZ_DATA_SPECIFIED
Definition: pkcs11t.h:1261
CK_ULONG CK_RSA_PKCS_MGF_TYPE
Definition: pkcs11t.h:1241

References CKZ_DATA_SPECIFIED, CK_MECHANISM::pParameter, Botan::PKCS11::RsaPkcsOaep, and CK_MECHANISM::ulParameterLen.

◆ create_rsa_sign_mechanism()

MechanismWrapper Botan::PKCS11::MechanismWrapper::create_rsa_sign_mechanism ( const std::string &  padding)
static

Creates the CK_MECHANISM data for RSA signature/verification

Parameters
paddingsupported paddings are Raw (X.509), EMSA3 (PKCS#1 v1.5), EMSA4 (PKCS#1 PSS), EMSA2 (ANSI X9.31) and ISO9796 (ISO/IEC 9796)

Definition at line 200 of file p11_mechanism.cpp.

201 {
202 auto mechanism_info_it = SignMechanisms.find(padding);
203 if(mechanism_info_it == SignMechanisms.end())
204 {
205 // at this point it would be possible to support additional configurations that are not predefined above by parsing `padding`
206 throw Lookup_Error("PKCS#11 RSA sign/verify does not support EMSA " + padding);
207 }
208 RSA_SignMechanism mechanism_info = mechanism_info_it->second;
209
210 MechanismWrapper mech(mechanism_info.type);
211 if(PssOptions.find(mechanism_info.type) != PssOptions.end())
212 {
213 mech.m_parameters = std::make_shared<MechanismParameters>();
214 mech.m_parameters->pss_params.hashAlg = static_cast<CK_MECHANISM_TYPE>(mechanism_info.hash);
215 mech.m_parameters->pss_params.mgf = static_cast<CK_RSA_PKCS_MGF_TYPE>(mechanism_info.mgf);
216 mech.m_parameters->pss_params.sLen = static_cast<Ulong>(mechanism_info.salt_size);
217 mech.m_mechanism.pParameter = mech.m_parameters.get();
218 mech.m_mechanism.ulParameterLen = sizeof(RsaPkcsPssParams);
219 }
220 return mech;
221 }
CK_RSA_PKCS_PSS_PARAMS RsaPkcsPssParams
Definition: p11.h:851
CK_ULONG Ulong
Definition: p11.h:838

References CK_MECHANISM::pParameter, and CK_MECHANISM::ulParameterLen.

◆ data()

Mechanism * Botan::PKCS11::MechanismWrapper::data ( ) const
inline
Returns
a pointer to the CK_MECHANISM struct that can be passed to the cryptoki functions

Definition at line 84 of file p11_mechanism.h.

85 {
86 return const_cast<Mechanism*>(&m_mechanism);
87 }
CK_MECHANISM Mechanism
Definition: p11.h:841

◆ padding_size()

size_t Botan::PKCS11::MechanismWrapper::padding_size ( ) const
inline
Returns
the size of the padding in bytes (for encryption/decryption)

Definition at line 90 of file p11_mechanism.h.

91 {
92 return m_padding_size;
93 }

◆ set_ecdh_other_key()

void Botan::PKCS11::MechanismWrapper::set_ecdh_other_key ( const uint8_t  other_key[],
size_t  other_key_len 
)
inline

Sets the public key of the other party for the ECDH mechanism parameters.

Parameters
other_keykey of the other party
other_key_lensize of the key of the other party in bytes

Definition at line 77 of file p11_mechanism.h.

78 {
79 m_parameters->ecdh_params.pPublicData = const_cast<uint8_t*>(other_key);
80 m_parameters->ecdh_params.ulPublicDataLen = static_cast<Ulong>(other_key_len);
81 }

◆ set_ecdh_salt()

void Botan::PKCS11::MechanismWrapper::set_ecdh_salt ( const uint8_t  salt[],
size_t  salt_len 
)
inline

Sets the salt for the ECDH mechanism parameters.

Parameters
saltthe salt
salt_lensize of the salt in bytes

Definition at line 66 of file p11_mechanism.h.

67 {
68 m_parameters->ecdh_params.pSharedData = const_cast<uint8_t*>(salt);
69 m_parameters->ecdh_params.ulSharedDataLen = static_cast<Ulong>(salt_len);
70 }
size_t salt_len
Definition: x509_obj.cpp:25

References salt_len.


The documentation for this class was generated from the following files: