1EVP_PKEY_CTX_CTRL(3) OpenSSL EVP_PKEY_CTX_CTRL(3)
2
6 EVP_PKEY_CTX_ctrl, EVP_PKEY_CTX_ctrl_str, EVP_PKEY_CTX_ctrl_uint64,
7 EVP_PKEY_CTX_md, EVP_PKEY_CTX_set_signature_md,
8 EVP_PKEY_CTX_get_signature_md, EVP_PKEY_CTX_set_mac_key,
9 EVP_PKEY_CTX_set_rsa_padding, EVP_PKEY_CTX_get_rsa_padding,
10 EVP_PKEY_CTX_set_rsa_pss_saltlen, EVP_PKEY_CTX_get_rsa_pss_saltlen,
11 EVP_PKEY_CTX_set_rsa_keygen_bits, EVP_PKEY_CTX_set_rsa_keygen_pubexp,
12 EVP_PKEY_CTX_set_rsa_keygen_primes, EVP_PKEY_CTX_set_rsa_mgf1_md,
13 EVP_PKEY_CTX_get_rsa_mgf1_md, EVP_PKEY_CTX_set_rsa_oaep_md,
14 EVP_PKEY_CTX_get_rsa_oaep_md, EVP_PKEY_CTX_set0_rsa_oaep_label,
15 EVP_PKEY_CTX_get0_rsa_oaep_label, EVP_PKEY_CTX_set_dsa_paramgen_bits,
16 EVP_PKEY_CTX_set_dh_paramgen_prime_len,
17 EVP_PKEY_CTX_set_dh_paramgen_subprime_len,
18 EVP_PKEY_CTX_set_dh_paramgen_generator,
19 EVP_PKEY_CTX_set_dh_paramgen_type, EVP_PKEY_CTX_set_dh_rfc5114,
20 EVP_PKEY_CTX_set_dhx_rfc5114, EVP_PKEY_CTX_set_dh_pad,
21 EVP_PKEY_CTX_set_dh_nid, EVP_PKEY_CTX_set_dh_kdf_type,
22 EVP_PKEY_CTX_get_dh_kdf_type, EVP_PKEY_CTX_set0_dh_kdf_oid,
23 EVP_PKEY_CTX_get0_dh_kdf_oid, EVP_PKEY_CTX_set_dh_kdf_md,
24 EVP_PKEY_CTX_get_dh_kdf_md, EVP_PKEY_CTX_set_dh_kdf_outlen,
25 EVP_PKEY_CTX_get_dh_kdf_outlen, EVP_PKEY_CTX_set0_dh_kdf_ukm,
26 EVP_PKEY_CTX_get0_dh_kdf_ukm, EVP_PKEY_CTX_set_ec_paramgen_curve_nid,
27 EVP_PKEY_CTX_set_ec_param_enc, EVP_PKEY_CTX_set_ecdh_cofactor_mode,
28 EVP_PKEY_CTX_get_ecdh_cofactor_mode, EVP_PKEY_CTX_set_ecdh_kdf_type,
29 EVP_PKEY_CTX_get_ecdh_kdf_type, EVP_PKEY_CTX_set_ecdh_kdf_md,
30 EVP_PKEY_CTX_get_ecdh_kdf_md, EVP_PKEY_CTX_set_ecdh_kdf_outlen,
31 EVP_PKEY_CTX_get_ecdh_kdf_outlen, EVP_PKEY_CTX_set0_ecdh_kdf_ukm,
32 EVP_PKEY_CTX_get0_ecdh_kdf_ukm, EVP_PKEY_CTX_set1_id,
33 EVP_PKEY_CTX_get1_id, EVP_PKEY_CTX_get1_id_len - algorithm specific
34 control operations
35
37 #include <openssl/evp.h>
38 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
40 int cmd, int p1, void *p2);
41 int EVP_PKEY_CTX_ctrl_uint64(EVP_PKEY_CTX *ctx, int keytype, int optype,
42 int cmd, uint64_t value);
43 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *type,
44 const char *value);
45 int EVP_PKEY_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md);
47 int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
49 int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **pmd);
50 int EVP_PKEY_CTX_set_mac_key(EVP_PKEY_CTX *ctx, unsigned char *key, int len);
52 #include <openssl/rsa.h>
54 int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int pad);
56 int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx, int *pad);
57 int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int len);
58 int EVP_PKEY_CTX_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int *len);
59 int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx, int mbits);
60 int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *pubexp);
61 int EVP_PKEY_CTX_set_rsa_keygen_primes(EVP_PKEY_CTX *ctx, int primes);
62 int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
63 int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
64 int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
65 int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
66 int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char *label, int len);
67 int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label);
68 #include <openssl/dsa.h>
70 int EVP_PKEY_CTX_set_dsa_paramgen_bits(EVP_PKEY_CTX *ctx, int nbits);
72 #include <openssl/dh.h>
74 int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int len);
76 int EVP_PKEY_CTX_set_dh_paramgen_subprime_len(EVP_PKEY_CTX *ctx, int len);
77 int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen);
78 int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int type);
79 int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
80 int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid);
81 int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
82 int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
83 int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
84 int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx);
85 int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT *oid);
86 int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT **oid);
87 int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
88 int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
89 int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
90 int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
91 int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
92 int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
93 #include <openssl/ec.h>
95 int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
97 int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc);
98 int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
99 int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
100 int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
101 int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
102 int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
103 int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
104 int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
105 int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
106 int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
107 int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
108 int EVP_PKEY_CTX_set1_id(EVP_PKEY_CTX *ctx, void *id, size_t id_len);
110 int EVP_PKEY_CTX_get1_id(EVP_PKEY_CTX *ctx, void *id);
111 int EVP_PKEY_CTX_get1_id_len(EVP_PKEY_CTX *ctx, size_t *id_len);
112
114 The function EVP_PKEY_CTX_ctrl() sends a control operation to the
115 context ctx. The key type used must match keytype if it is not -1. The
116 parameter optype is a mask indicating which operations the control can
117 be applied to. The control command is indicated in cmd and any
118 additional arguments in p1 and p2.
119 For cmd = EVP_PKEY_CTRL_SET_MAC_KEY, p1 is the length of the MAC key,
121 and p2 is MAC key. This is used by Poly1305, SipHash, HMAC and CMAC.
122 Applications will not normally call EVP_PKEY_CTX_ctrl() directly but
124 will instead call one of the algorithm specific macros below.
125 The function EVP_PKEY_CTX_ctrl_uint64() is a wrapper that directly
127 passes a uint64 value as p2 to EVP_PKEY_CTX_ctrl().
128 The function EVP_PKEY_CTX_ctrl_str() allows an application to send an
130 algorithm specific control operation to a context ctx in string form.
131 This is intended to be used for options specified on the command line
132 or in text files. The commands supported are documented in the openssl
133 utility command line pages for the option -pkeyopt which is supported
134 by the pkeyutl, genpkey and req commands.
135 The function EVP_PKEY_CTX_md() sends a message digest control operation
137 to the context ctx. The message digest is specified by its name md.
138 All the remaining "functions" are implemented as macros.
140 The EVP_PKEY_CTX_set_signature_md() macro sets the message digest type
142 used in a signature. It can be used in the RSA, DSA and ECDSA
143 algorithms.
144 The EVP_PKEY_CTX_get_signature_md() macro gets the message digest type
146 used in a signature. It can be used in the RSA, DSA and ECDSA
147 algorithms.
148 Key generation typically involves setting up parameters to be used and
150 generating the private and public key data. Some algorithm
151 implementations allow private key data to be set explicitly using the
152 EVP_PKEY_CTX_set_mac_key() macro. In this case key generation is simply
153 the process of setting up the parameters for the key and then setting
154 the raw key data to the value explicitly provided by that macro.
155 Normally applications would call EVP_PKEY_new_raw_private_key(3) or
156 similar functions instead of this macro.
157 The EVP_PKEY_CTX_set_mac_key() macro can be used with any of the
159 algorithms supported by the EVP_PKEY_new_raw_private_key(3) function.
160 RSA parameters
162 The EVP_PKEY_CTX_set_rsa_padding() macro sets the RSA padding mode for
163 ctx. The pad parameter can take the value RSA_PKCS1_PADDING for PKCS#1
164 padding, RSA_SSLV23_PADDING for SSLv23 padding, RSA_NO_PADDING for no
165 padding, RSA_PKCS1_OAEP_PADDING for OAEP padding (encrypt and decrypt
166 only), RSA_X931_PADDING for X9.31 padding (signature operations only)
167 and RSA_PKCS1_PSS_PADDING (sign and verify only).
168 Two RSA padding modes behave differently if
170 EVP_PKEY_CTX_set_signature_md() is used. If this macro is called for
171 PKCS#1 padding the plaintext buffer is an actual digest value and is
172 encapsulated in a DigestInfo structure according to PKCS#1 when signing
173 and this structure is expected (and stripped off) when verifying. If
174 this control is not used with RSA and PKCS#1 padding then the supplied
175 data is used directly and not encapsulated. In the case of X9.31
176 padding for RSA the algorithm identifier byte is added or checked and
177 removed if this control is called. If it is not called then the first
178 byte of the plaintext buffer is expected to be the algorithm identifier
179 byte.
180 The EVP_PKEY_CTX_get_rsa_padding() macro gets the RSA padding mode for
182 ctx.
183 The EVP_PKEY_CTX_set_rsa_pss_saltlen() macro sets the RSA PSS salt
185 length to len. As its name implies it is only supported for PSS
186 padding. Three special values are supported: RSA_PSS_SALTLEN_DIGEST
187 sets the salt length to the digest length, RSA_PSS_SALTLEN_MAX sets the
188 salt length to the maximum permissible value. When verifying
189 RSA_PSS_SALTLEN_AUTO causes the salt length to be automatically
190 determined based on the PSS block structure. If this macro is not
191 called maximum salt length is used when signing and auto detection when
192 verifying is used by default.
193 The EVP_PKEY_CTX_get_rsa_pss_saltlen() macro gets the RSA PSS salt
195 length for ctx. The padding mode must have been set to
196 RSA_PKCS1_PSS_PADDING.
197 The EVP_PKEY_CTX_set_rsa_keygen_bits() macro sets the RSA key length
199 for RSA key generation to bits. If not specified 1024 bits is used.
200 The EVP_PKEY_CTX_set_rsa_keygen_pubexp() macro sets the public exponent
202 value for RSA key generation to pubexp. Currently it should be an odd
203 integer. The pubexp pointer is used internally by this function so it
204 should not be modified or freed after the call. If not specified 65537
205 is used.
206 The EVP_PKEY_CTX_set_rsa_keygen_primes() macro sets the number of
208 primes for RSA key generation to primes. If not specified 2 is used.
209 The EVP_PKEY_CTX_set_rsa_mgf1_md() macro sets the MGF1 digest for RSA
211 padding schemes to md. If not explicitly set the signing digest is
212 used. The padding mode must have been set to RSA_PKCS1_OAEP_PADDING or
213 RSA_PKCS1_PSS_PADDING.
214 The EVP_PKEY_CTX_get_rsa_mgf1_md() macro gets the MGF1 digest for ctx.
216 If not explicitly set the signing digest is used. The padding mode must
217 have been set to RSA_PKCS1_OAEP_PADDING or RSA_PKCS1_PSS_PADDING.
218 The EVP_PKEY_CTX_set_rsa_oaep_md() macro sets the message digest type
220 used in RSA OAEP to md. The padding mode must have been set to
221 RSA_PKCS1_OAEP_PADDING.
222 The EVP_PKEY_CTX_get_rsa_oaep_md() macro gets the message digest type
224 used in RSA OAEP to md. The padding mode must have been set to
225 RSA_PKCS1_OAEP_PADDING.
226 The EVP_PKEY_CTX_set0_rsa_oaep_label() macro sets the RSA OAEP label to
228 label and its length to len. If label is NULL or len is 0, the label is
229 cleared. The library takes ownership of the label so the caller should
230 not free the original memory pointed to by label. The padding mode
231 must have been set to RSA_PKCS1_OAEP_PADDING.
232 The EVP_PKEY_CTX_get0_rsa_oaep_label() macro gets the RSA OAEP label to
234 label. The return value is the label length. The padding mode must have
235 been set to RSA_PKCS1_OAEP_PADDING. The resulting pointer is owned by
236 the library and should not be freed by the caller.
237 DSA parameters
239 The EVP_PKEY_CTX_set_dsa_paramgen_bits() macro sets the number of bits
240 used for DSA parameter generation to bits. If not specified 1024 is
241 used.
242 DH parameters
244 The EVP_PKEY_CTX_set_dh_paramgen_prime_len() macro sets the length of
245 the DH prime parameter p for DH parameter generation. If this macro is
246 not called then 1024 is used. Only accepts lengths greater than or
247 equal to 256.
248 The EVP_PKEY_CTX_set_dh_paramgen_subprime_len() macro sets the length
250 of the DH optional subprime parameter q for DH parameter generation.
251 The default is 256 if the prime is at least 2048 bits long or 160
252 otherwise. The DH paramgen type must have been set to x9.42.
253 The EVP_PKEY_CTX_set_dh_paramgen_generator() macro sets DH generator to
255 gen for DH parameter generation. If not specified 2 is used.
256 The EVP_PKEY_CTX_set_dh_paramgen_type() macro sets the key type for DH
258 parameter generation. Use 0 for PKCS#3 DH and 1 for X9.42 DH. The
259 default is 0.
260 The EVP_PKEY_CTX_set_dh_pad() macro sets the DH padding mode. If pad is
262 1 the shared secret is padded with zeroes up to the size of the DH
263 prime p. If pad is zero (the default) then no padding is performed.
264 EVP_PKEY_CTX_set_dh_nid() sets the DH parameters to values
266 corresponding to nid as defined in RFC7919. The nid parameter must be
267 NID_ffdhe2048, NID_ffdhe3072, NID_ffdhe4096, NID_ffdhe6144,
268 NID_ffdhe8192 or NID_undef to clear the stored value. This macro can be
269 called during parameter or key generation. The nid parameter and the
270 rfc5114 parameter are mutually exclusive.
271 The EVP_PKEY_CTX_set_dh_rfc5114() and EVP_PKEY_CTX_set_dhx_rfc5114()
273 macros are synonymous. They set the DH parameters to the values defined
274 in RFC5114. The rfc5114 parameter must be 1, 2 or 3 corresponding to
275 RFC5114 sections 2.1, 2.2 and 2.3. or 0 to clear the stored value. This
276 macro can be called during parameter generation. The ctx must have a
277 key type of EVP_PKEY_DHX. The rfc5114 parameter and the nid parameter
278 are mutually exclusive.
279 DH key derivation function parameters
281 Note that all of the following functions require that the ctx parameter
282 has a private key type of EVP_PKEY_DHX. When using key derivation, the
283 output of EVP_PKEY_derive() is the output of the KDF instead of the DH
284 shared secret. The KDF output is typically used as a Key Encryption
285 Key (KEK) that in turn encrypts a Content Encryption Key (CEK).
286 The EVP_PKEY_CTX_set_dh_kdf_type() macro sets the key derivation
288 function type to kdf for DH key derivation. Possible values are
289 EVP_PKEY_DH_KDF_NONE and EVP_PKEY_DH_KDF_X9_42 which uses the key
290 derivation specified in RFC2631 (based on the keying algorithm
291 described in X9.42). When using key derivation, the kdf_oid, kdf_md and
292 kdf_outlen parameters must also be specified.
293 The EVP_PKEY_CTX_get_dh_kdf_type() macro gets the key derivation
295 function type for ctx used for DH key derivation. Possible values are
296 EVP_PKEY_DH_KDF_NONE and EVP_PKEY_DH_KDF_X9_42.
297 The EVP_PKEY_CTX_set0_dh_kdf_oid() macro sets the key derivation
299 function object identifier to oid for DH key derivation. This OID
300 should identify the algorithm to be used with the Content Encryption
301 Key. The library takes ownership of the object identifier so the
302 caller should not free the original memory pointed to by oid.
303 The EVP_PKEY_CTX_get0_dh_kdf_oid() macro gets the key derivation
305 function oid for ctx used for DH key derivation. The resulting pointer
306 is owned by the library and should not be freed by the caller.
307 The EVP_PKEY_CTX_set_dh_kdf_md() macro sets the key derivation function
309 message digest to md for DH key derivation. Note that RFC2631 specifies
310 that this digest should be SHA1 but OpenSSL tolerates other digests.
311 The EVP_PKEY_CTX_get_dh_kdf_md() macro gets the key derivation function
313 message digest for ctx used for DH key derivation.
314 The EVP_PKEY_CTX_set_dh_kdf_outlen() macro sets the key derivation
316 function output length to len for DH key derivation.
317 The EVP_PKEY_CTX_get_dh_kdf_outlen() macro gets the key derivation
319 function output length for ctx used for DH key derivation.
320 The EVP_PKEY_CTX_set0_dh_kdf_ukm() macro sets the user key material to
322 ukm and its length to len for DH key derivation. This parameter is
323 optional and corresponds to the partyAInfo field in RFC2631 terms. The
324 specification requires that it is 512 bits long but this is not
325 enforced by OpenSSL. The library takes ownership of the user key
326 material so the caller should not free the original memory pointed to
327 by ukm.
328 The EVP_PKEY_CTX_get0_dh_kdf_ukm() macro gets the user key material for
330 ctx. The return value is the user key material length. The resulting
331 pointer is owned by the library and should not be freed by the caller.
332 EC parameters
334 The EVP_PKEY_CTX_set_ec_paramgen_curve_nid() sets the EC curve for EC
335 parameter generation to nid. For EC parameter generation this macro
336 must be called or an error occurs because there is no default curve.
337 This function can also be called to set the curve explicitly when
338 generating an EC key.
339 The EVP_PKEY_CTX_set_ec_param_enc() macro sets the EC parameter
341 encoding to param_enc when generating EC parameters or an EC key. The
342 encoding can be OPENSSL_EC_EXPLICIT_CURVE for explicit parameters (the
343 default in versions of OpenSSL before 1.1.0) or OPENSSL_EC_NAMED_CURVE
344 to use named curve form. For maximum compatibility the named curve
345 form should be used. Note: the OPENSSL_EC_NAMED_CURVE value was added
346 in OpenSSL 1.1.0; previous versions should use 0 instead.
347 ECDH parameters
349 The EVP_PKEY_CTX_set_ecdh_cofactor_mode() macro sets the cofactor mode
350 to cofactor_mode for ECDH key derivation. Possible values are 1 to
351 enable cofactor key derivation, 0 to disable it and -1 to clear the
352 stored cofactor mode and fallback to the private key cofactor mode.
353 The EVP_PKEY_CTX_get_ecdh_cofactor_mode() macro returns the cofactor
355 mode for ctx used for ECDH key derivation. Possible values are 1 when
356 cofactor key derivation is enabled and 0 otherwise.
357 ECDH key derivation function parameters
359 The EVP_PKEY_CTX_set_ecdh_kdf_type() macro sets the key derivation
360 function type to kdf for ECDH key derivation. Possible values are
361 EVP_PKEY_ECDH_KDF_NONE and EVP_PKEY_ECDH_KDF_X9_63 which uses the key
362 derivation specified in X9.63. When using key derivation, the kdf_md
363 and kdf_outlen parameters must also be specified.
364 The EVP_PKEY_CTX_get_ecdh_kdf_type() macro returns the key derivation
366 function type for ctx used for ECDH key derivation. Possible values are
367 EVP_PKEY_ECDH_KDF_NONE and EVP_PKEY_ECDH_KDF_X9_63.
368 The EVP_PKEY_CTX_set_ecdh_kdf_md() macro sets the key derivation
370 function message digest to md for ECDH key derivation. Note that X9.63
371 specifies that this digest should be SHA1 but OpenSSL tolerates other
372 digests.
373 The EVP_PKEY_CTX_get_ecdh_kdf_md() macro gets the key derivation
375 function message digest for ctx used for ECDH key derivation.
376 The EVP_PKEY_CTX_set_ecdh_kdf_outlen() macro sets the key derivation
378 function output length to len for ECDH key derivation.
379 The EVP_PKEY_CTX_get_ecdh_kdf_outlen() macro gets the key derivation
381 function output length for ctx used for ECDH key derivation.
382 The EVP_PKEY_CTX_set0_ecdh_kdf_ukm() macro sets the user key material
384 to ukm for ECDH key derivation. This parameter is optional and
385 corresponds to the shared info in X9.63 terms. The library takes
386 ownership of the user key material so the caller should not free the
387 original memory pointed to by ukm.
388 The EVP_PKEY_CTX_get0_ecdh_kdf_ukm() macro gets the user key material
390 for ctx. The return value is the user key material length. The
391 resulting pointer is owned by the library and should not be freed by
392 the caller.
393 Other parameters
395 The EVP_PKEY_CTX_set1_id(), EVP_PKEY_CTX_get1_id() and
396 EVP_PKEY_CTX_get1_id_len() macros are used to manipulate the special
397 identifier field for specific signature algorithms such as SM2. The
398 EVP_PKEY_CTX_set1_id() sets an ID pointed by id with the length id_len
399 to the library. The library takes a copy of the id so that the caller
400 can safely free the original memory pointed to by id. The
401 EVP_PKEY_CTX_get1_id_len() macro returns the length of the ID set via a
402 previous call to EVP_PKEY_CTX_set1_id(). The length is usually used to
403 allocate adequate memory for further calls to EVP_PKEY_CTX_get1_id().
404 The EVP_PKEY_CTX_get1_id() macro returns the previously set ID value to
405 caller in id. The caller should allocate adequate memory space for the
406 id before calling EVP_PKEY_CTX_get1_id().
407
409 EVP_PKEY_CTX_ctrl() and its macros return a positive value for success
410 and 0 or a negative value for failure. In particular a return value of
411 -2 indicates the operation is not supported by the public key
412 algorithm.
413
415 EVP_PKEY_CTX_new(3), EVP_PKEY_encrypt(3), EVP_PKEY_decrypt(3),
416 EVP_PKEY_sign(3), EVP_PKEY_verify(3), EVP_PKEY_verify_recover(3),
417 EVP_PKEY_derive(3), EVP_PKEY_keygen(3)
418
420 The EVP_PKEY_CTX_set1_id(), EVP_PKEY_CTX_get1_id() and
421 EVP_PKEY_CTX_get1_id_len() macros were added in 1.1.1, other functions
422 were added in OpenSSL 1.0.0.
423
425 Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
426 Licensed under the OpenSSL license (the "License"). You may not use
428 this file except in compliance with the License. You can obtain a copy
429 in the file LICENSE in the source distribution or at
430 <https://www.openssl.org/source/license.html>.
4311.1.1c 2019-05-28 EVP_PKEY_CTX_CTRL(3)