EVP_PKEY_meth_new(3)
EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
NAME
EVP_PKEY_meth_new, EVP_PKEY_meth_free, EVP_PKEY_meth_copy,
EVP_PKEY_meth_find, EVP_PKEY_meth_add0, EVP_PKEY_METHOD,
EVP_PKEY_meth_set_init, EVP_PKEY_meth_set_copy,
EVP_PKEY_meth_set_cleanup, EVP_PKEY_meth_set_paramgen,
EVP_PKEY_meth_set_keygen, EVP_PKEY_meth_set_sign,
EVP_PKEY_meth_set_verify, EVP_PKEY_meth_set_verify_recover,
EVP_PKEY_meth_set_signctx, EVP_PKEY_meth_set_verifyctx,
EVP_PKEY_meth_set_encrypt, EVP_PKEY_meth_set_decrypt,
EVP_PKEY_meth_set_derive, EVP_PKEY_meth_set_ctrl,
EVP_PKEY_meth_get_init, EVP_PKEY_meth_get_copy,
EVP_PKEY_meth_get_cleanup, EVP_PKEY_meth_get_paramgen,
EVP_PKEY_meth_get_keygen, EVP_PKEY_meth_get_sign,
EVP_PKEY_meth_get_verify, EVP_PKEY_meth_get_verify_recover,
EVP_PKEY_meth_get_signctx, EVP_PKEY_meth_get_verifyctx,
EVP_PKEY_meth_get_encrypt, EVP_PKEY_meth_get_decrypt,
EVP_PKEY_meth_get_derive, EVP_PKEY_meth_get_ctrl -
manipulating EVP_PKEY_METHOD structure
SYNOPSIS
#include <openssl/evp.h>
typedef struct evp_pkey_method_st EVP_PKEY_METHOD;
EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags);
void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth);
void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src);
const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type);
int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth);
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
int (*init) (EVP_PKEY_CTX *ctx));
void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
int (*copy) (EVP_PKEY_CTX *dst,
EVP_PKEY_CTX *src));
void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
void (*cleanup) (EVP_PKEY_CTX *ctx));
void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
int (*paramgen_init) (EVP_PKEY_CTX *ctx),
int (*paramgen) (EVP_PKEY_CTX *ctx,
EVP_PKEY *pkey));
void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
int (*keygen_init) (EVP_PKEY_CTX *ctx),
int (*keygen) (EVP_PKEY_CTX *ctx,
EVP_PKEY *pkey));
void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
int (*sign_init) (EVP_PKEY_CTX *ctx),
int (*sign) (EVP_PKEY_CTX *ctx,
unsigned char *sig, size_t *siglen,
const unsigned char *tbs,
size_t tbslen));
void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
int (*verify_init) (EVP_PKEY_CTX *ctx),
int (*verify) (EVP_PKEY_CTX *ctx,
const unsigned char *sig,
size_t siglen,
const unsigned char *tbs,
size_t tbslen));
void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
int (*verify_recover_init) (EVP_PKEY_CTX
*ctx),
int (*verify_recover) (EVP_PKEY_CTX
*ctx,
unsigned char
*sig,
size_t *siglen,
const unsigned
char *tbs,
size_t tbslen));
void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
int (*signctx_init) (EVP_PKEY_CTX *ctx,
EVP_MD_CTX *mctx),
int (*signctx) (EVP_PKEY_CTX *ctx,
unsigned char *sig,
size_t *siglen,
EVP_MD_CTX *mctx));
void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
EVP_MD_CTX *mctx),
int (*verifyctx) (EVP_PKEY_CTX *ctx,
const unsigned char *sig,
int siglen,
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
EVP_MD_CTX *mctx));
void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
int (*encrypt_init) (EVP_PKEY_CTX *ctx),
int (*encryptfn) (EVP_PKEY_CTX *ctx,
unsigned char *out,
size_t *outlen,
const unsigned char *in,
size_t inlen));
void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
int (*decrypt_init) (EVP_PKEY_CTX *ctx),
int (*decrypt) (EVP_PKEY_CTX *ctx,
unsigned char *out,
size_t *outlen,
const unsigned char *in,
size_t inlen));
void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
int (*derive_init) (EVP_PKEY_CTX *ctx),
int (*derive) (EVP_PKEY_CTX *ctx,
unsigned char *key,
size_t *keylen));
void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
void *p2),
int (*ctrl_str) (EVP_PKEY_CTX *ctx,
const char *type,
const char *value));
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
void EVP_PKEY_meth_get_init(EVP_PKEY_METHOD *pmeth,
int (**pinit) (EVP_PKEY_CTX *ctx));
void EVP_PKEY_meth_get_copy(EVP_PKEY_METHOD *pmeth,
int (**pcopy) (EVP_PKEY_CTX *dst,
EVP_PKEY_CTX *src));
void EVP_PKEY_meth_get_cleanup(EVP_PKEY_METHOD *pmeth,
void (**pcleanup) (EVP_PKEY_CTX *ctx));
void EVP_PKEY_meth_get_paramgen(EVP_PKEY_METHOD *pmeth,
int (**pparamgen_init) (EVP_PKEY_CTX *ctx),
int (**pparamgen) (EVP_PKEY_CTX *ctx,
EVP_PKEY *pkey));
void EVP_PKEY_meth_get_keygen(EVP_PKEY_METHOD *pmeth,
int (**pkeygen_init) (EVP_PKEY_CTX *ctx),
int (**pkeygen) (EVP_PKEY_CTX *ctx,
EVP_PKEY *pkey));
void EVP_PKEY_meth_get_sign(EVP_PKEY_METHOD *pmeth,
int (**psign_init) (EVP_PKEY_CTX *ctx),
int (**psign) (EVP_PKEY_CTX *ctx,
unsigned char *sig, size_t *siglen,
const unsigned char *tbs,
size_t tbslen));
void EVP_PKEY_meth_get_verify(EVP_PKEY_METHOD *pmeth,
int (**pverify_init) (EVP_PKEY_CTX *ctx),
int (**pverify) (EVP_PKEY_CTX *ctx,
const unsigned char *sig,
size_t siglen,
const unsigned char *tbs,
size_t tbslen));
void EVP_PKEY_meth_get_verify_recover(EVP_PKEY_METHOD *pmeth,
int (**pverify_recover_init) (EVP_PKEY_CTX
*ctx),
int (**pverify_recover) (EVP_PKEY_CTX
*ctx,
unsigned char
*sig,
size_t *siglen,
const unsigned
char *tbs,
size_t tbslen));
void EVP_PKEY_meth_get_signctx(EVP_PKEY_METHOD *pmeth,
int (**psignctx_init) (EVP_PKEY_CTX *ctx,
EVP_MD_CTX *mctx),
int (**psignctx) (EVP_PKEY_CTX *ctx,
unsigned char *sig,
size_t *siglen,
EVP_MD_CTX *mctx));
void EVP_PKEY_meth_get_verifyctx(EVP_PKEY_METHOD *pmeth,
int (**pverifyctx_init) (EVP_PKEY_CTX *ctx,
EVP_MD_CTX *mctx),
int (**pverifyctx) (EVP_PKEY_CTX *ctx,
const unsigned char *sig,
int siglen,
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
EVP_MD_CTX *mctx));
void EVP_PKEY_meth_get_encrypt(EVP_PKEY_METHOD *pmeth,
int (**pencrypt_init) (EVP_PKEY_CTX *ctx),
int (**pencryptfn) (EVP_PKEY_CTX *ctx,
unsigned char *out,
size_t *outlen,
const unsigned char *in,
size_t inlen));
void EVP_PKEY_meth_get_decrypt(EVP_PKEY_METHOD *pmeth,
int (**pdecrypt_init) (EVP_PKEY_CTX *ctx),
int (**pdecrypt) (EVP_PKEY_CTX *ctx,
unsigned char *out,
size_t *outlen,
const unsigned char *in,
size_t inlen));
void EVP_PKEY_meth_get_derive(EVP_PKEY_METHOD *pmeth,
int (**pderive_init) (EVP_PKEY_CTX *ctx),
int (**pderive) (EVP_PKEY_CTX *ctx,
unsigned char *key,
size_t *keylen));
void EVP_PKEY_meth_get_ctrl(EVP_PKEY_METHOD *pmeth,
int (**pctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
void *p2),
int (**pctrl_str) (EVP_PKEY_CTX *ctx,
const char *type,
const char *value));
DESCRIPTION
EVP_PKEY_METHOD is a structure which holds a set of methods
for a specific public key cryptographic algorithm. Those
methods are usually used to perform different jobs, such as
generating a key, signing or verifying, encrypting or
decrypting, etc.
There are two places where the EVP_PKEY_METHOD objects are
stored: one is a built-in static array representing the
standard methods for different algorithms, and the other one
is a stack of user-defined application-specific methods,
which can be manipulated by using EVP_PKEY_meth_add0(3).
The EVP_PKEY_METHOD objects are usually referenced by
EVP_PKEY_CTX objects.
Methods
The methods are the underlying implementations of a
particular public key algorithm present by the EVP_PKEY_CTX
object.
int (*init) (EVP_PKEY_CTX *ctx);
int (*copy) (EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src);
void (*cleanup) (EVP_PKEY_CTX *ctx);
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
The init() method is called to initialize algorithm-specific
data when a new EVP_PKEY_CTX is created. As opposed to
init(), the cleanup() method is called when an EVP_PKEY_CTX
is freed. The copy() method is called when an EVP_PKEY_CTX
is being duplicated. Refer to EVP_PKEY_CTX_new(3),
EVP_PKEY_CTX_new_id(3), EVP_PKEY_CTX_free(3) and
EVP_PKEY_CTX_dup(3).
int (*paramgen_init) (EVP_PKEY_CTX *ctx);
int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
The paramgen_init() and paramgen() methods deal with key
parameter generation. They are called by
EVP_PKEY_paramgen_init(3) and EVP_PKEY_paramgen(3) to handle
the parameter generation process.
int (*keygen_init) (EVP_PKEY_CTX *ctx);
int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
The keygen_init() and keygen() methods are used to generate
the actual key for the specified algorithm. They are called
by EVP_PKEY_keygen_init(3) and EVP_PKEY_keygen(3).
int (*sign_init) (EVP_PKEY_CTX *ctx);
int (*sign) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbslen);
The sign_init() and sign() methods are used to generate the
signature of a piece of data using a private key. They are
called by EVP_PKEY_sign_init(3) and EVP_PKEY_sign(3).
int (*verify_init) (EVP_PKEY_CTX *ctx);
int (*verify) (EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen);
The verify_init() and verify() methods are used to verify
whether a signature is valid. They are called by
EVP_PKEY_verify_init(3) and EVP_PKEY_verify(3).
int (*verify_recover_init) (EVP_PKEY_CTX *ctx);
int (*verify_recover) (EVP_PKEY_CTX *ctx,
unsigned char *rout, size_t *routlen,
const unsigned char *sig, size_t siglen);
The verify_recover_init() and verify_recover() methods are
used to verify a signature and then recover the digest from
the signature (for instance, a signature that was generated
by RSA signing algorithm). They are called by
EVP_PKEY_verify_recover_init(3) and
EVP_PKEY_verify_recover(3).
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
int (*signctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
int (*signctx) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx);
The signctx_init() and signctx() methods are used to sign a
digest present by a EVP_MD_CTX object. They are called by
the EVP_DigestSign functions. See EVP_DigestSignInit(3) for
detail.
int (*verifyctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
int (*verifyctx) (EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
EVP_MD_CTX *mctx);
The verifyctx_init() and verifyctx() methods are used to
verify a signature against the data in a EVP_MD_CTX object.
They are called by the various EVP_DigestVerify functions.
See EVP_DigestVerifyInit(3) for detail.
int (*encrypt_init) (EVP_PKEY_CTX *ctx);
int (*encrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen);
The encrypt_init() and encrypt() methods are used to encrypt
a piece of data. They are called by
EVP_PKEY_encrypt_init(3) and EVP_PKEY_encrypt(3).
int (*decrypt_init) (EVP_PKEY_CTX *ctx);
int (*decrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen);
The decrypt_init() and decrypt() methods are used to decrypt
a piece of data. They are called by
EVP_PKEY_decrypt_init(3) and EVP_PKEY_decrypt(3).
int (*derive_init) (EVP_PKEY_CTX *ctx);
int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
The derive_init() and derive() methods are used to derive
the shared secret from a public key algorithm (for instance,
the DH algorithm). They are called by
EVP_PKEY_derive_init(3) and EVP_PKEY_derive(3).
int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1, void *p2);
int (*ctrl_str) (EVP_PKEY_CTX *ctx, const char *type, const char *value);
The ctrl() and ctrl_str() methods are used to adjust
algorithm-specific settings. See EVP_PKEY_CTX_ctrl(3) and
related functions for detail.
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
int (*digestsign) (EVP_MD_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbslen);
int (*digestverify) (EVP_MD_CTX *ctx, const unsigned char *sig,
size_t siglen, const unsigned char *tbs,
size_t tbslen);
The digestsign() and digestverify() methods are used to
generate or verify a signature in a one-shot mode. They
could be called by EVP_DigetSign(3) and EVP_DigestVerify(3).
Functions
EVP_PKEY_meth_new() creates and returns a new
EVP_PKEY_METHOD object, and associates the given id and
flags. The following flags are supported:
EVP_PKEY_FLAG_AUTOARGLEN
EVP_PKEY_FLAG_SIGCTX_CUSTOM
If an EVP_PKEY_METHOD is set with the
EVP_PKEY_FLAG_AUTOARGLEN flag, the maximum size of the
output buffer will be automatically calculated or checked in
corresponding EVP methods by the EVP framework. Thus the
implementations of these methods don't need to care about
handling the case of returning output buffer size by
themselves. For details on the output buffer size, refer to
EVP_PKEY_sign(3).
The EVP_PKEY_FLAG_SIGCTX_CUSTOM is used to indicate the
signctx() method of an EVP_PKEY_METHOD is always called by
the EVP framework while doing a digest signing operation by
calling EVP_DigestSignFinal(3).
EVP_PKEY_meth_free() frees an existing EVP_PKEY_METHOD
pointed by pmeth.
EVP_PKEY_meth_copy() copies an EVP_PKEY_METHOD object from
src to dst.
EVP_PKEY_meth_find() finds an EVP_PKEY_METHOD object with
the id. This function first searches through the user-
defined method objects and then the built-in objects.
EVP_PKEY_meth_add0() adds pmeth to the user defined stack of
methods.
The EVP_PKEY_meth_set functions set the corresponding fields
of EVP_PKEY_METHOD structure with the arguments passed.
The EVP_PKEY_meth_get functions get the corresponding fields
of EVP_PKEY_METHOD structure to the arguments provided.
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EVP_PKEY_meth_new(3) OpenSSL EVP_PKEY_meth_new(3)
RETURN VALUES
EVP_PKEY_meth_new() returns a pointer to a new
EVP_PKEY_METHOD object or returns NULL on error.
EVP_PKEY_meth_free() and EVP_PKEY_meth_copy() do not return
values.
EVP_PKEY_meth_find() returns a pointer to the found
EVP_PKEY_METHOD object or returns NULL if not found.
EVP_PKEY_meth_add0() returns 1 if method is added
successfully or 0 if an error occurred.
All EVP_PKEY_meth_set and EVP_PKEY_meth_get functions have
no return values. For the 'get' functions, function pointers
are returned by arguments.
COPYRIGHT
Copyright 2017 The OpenSSL Project Authors. All Rights
Reserved.
Licensed under the OpenSSL license (the "License"). You may
not use this file except in compliance with the License.
You can obtain a copy in the file LICENSE in the source
distribution or at
<https://www.openssl.org/source/license.html>.
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