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편집 파일: EVP_PKEY_meth_set_public_check.3

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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_set_digestsign, EVP_PKEY_meth_set_digestverify, EVP_PKEY_meth_set_check, EVP_PKEY_meth_set_public_check, EVP_PKEY_meth_set_param_check, EVP_PKEY_meth_set_digest_custom, 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, EVP_PKEY_meth_get_digestsign, EVP_PKEY_meth_get_digestverify, EVP_PKEY_meth_get_check, EVP_PKEY_meth_get_public_check, EVP_PKEY_meth_get_param_check, EVP_PKEY_meth_get_digest_custom, EVP_PKEY_meth_remove \&\- manipulating EVP_PKEY_METHOD structure .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); \& int EVP_PKEY_meth_remove(const EVP_PKEY_METHOD *pmeth); \& \& 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, \& 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)); \& void EVP_PKEY_meth_set_digestsign(EVP_PKEY_METHOD *pmeth, \& int (*digestsign) (EVP_MD_CTX *ctx, \& unsigned char *sig, \& size_t *siglen, \& const unsigned char *tbs, \& size_t tbslen)); \& void EVP_PKEY_meth_set_digestverify(EVP_PKEY_METHOD *pmeth, \& int (*digestverify) (EVP_MD_CTX *ctx, \& const unsigned char *sig, \& size_t siglen, \& const unsigned char *tbs, \& size_t tbslen)); \& void EVP_PKEY_meth_set_check(EVP_PKEY_METHOD *pmeth, \& int (*check) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_set_public_check(EVP_PKEY_METHOD *pmeth, \& int (*check) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_set_param_check(EVP_PKEY_METHOD *pmeth, \& int (*check) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_set_digest_custom(EVP_PKEY_METHOD *pmeth, \& int (*digest_custom) (EVP_PKEY_CTX *ctx, \& EVP_MD_CTX *mctx)); \& \& void EVP_PKEY_meth_get_init(const EVP_PKEY_METHOD *pmeth, \& int (**pinit) (EVP_PKEY_CTX *ctx)); \& void EVP_PKEY_meth_get_copy(const EVP_PKEY_METHOD *pmeth, \& int (**pcopy) (EVP_PKEY_CTX *dst, \& EVP_PKEY_CTX *src)); \& void EVP_PKEY_meth_get_cleanup(const EVP_PKEY_METHOD *pmeth, \& void (**pcleanup) (EVP_PKEY_CTX *ctx)); \& void EVP_PKEY_meth_get_paramgen(const 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(const 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(const 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(const 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(const 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(const 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(const 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, \& EVP_MD_CTX *mctx)); \& void EVP_PKEY_meth_get_encrypt(const 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(const 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(const 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(const 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)); \& void EVP_PKEY_meth_get_digestsign(EVP_PKEY_METHOD *pmeth, \& int (**digestsign) (EVP_MD_CTX *ctx, \& unsigned char *sig, \& size_t *siglen, \& const unsigned char *tbs, \& size_t tbslen)); \& void EVP_PKEY_meth_get_digestverify(EVP_PKEY_METHOD *pmeth, \& int (**digestverify) (EVP_MD_CTX *ctx, \& const unsigned char *sig, \& size_t siglen, \& const unsigned char *tbs, \& size_t tbslen)); \& void EVP_PKEY_meth_get_check(const EVP_PKEY_METHOD *pmeth, \& int (**pcheck) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_get_public_check(const EVP_PKEY_METHOD *pmeth, \& int (**pcheck) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_get_param_check(const EVP_PKEY_METHOD *pmeth, \& int (**pcheck) (EVP_PKEY *pkey)); \& void EVP_PKEY_meth_get_digest_custom(EVP_PKEY_METHOD *pmeth, \& int (**pdigest_custom) (EVP_PKEY_CTX *ctx, \& EVP_MD_CTX *mctx)); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fB\s-1EVP_PKEY_METHOD\s0\fR 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. .PP There are two places where the \fB\s-1EVP_PKEY_METHOD\s0\fR 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 \fBEVP_PKEY_meth_add0\fR\|(3). .PP The \fB\s-1EVP_PKEY_METHOD\s0\fR objects are usually referenced by \fB\s-1EVP_PKEY_CTX\s0\fR objects. .SS "Methods" .IX Subsection "Methods" The methods are the underlying implementations of a particular public key algorithm present by the \fB\s-1EVP_PKEY_CTX\s0\fR object. .PP .Vb 3 \& int (*init) (EVP_PKEY_CTX *ctx); \& int (*copy) (EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src); \& void (*cleanup) (EVP_PKEY_CTX *ctx); .Ve .PP The \fBinit()\fR method is called to initialize algorithm-specific data when a new \&\fB\s-1EVP_PKEY_CTX\s0\fR is created. As opposed to \fBinit()\fR, the \fBcleanup()\fR method is called when an \fB\s-1EVP_PKEY_CTX\s0\fR is freed. The \fBcopy()\fR method is called when an \fB\s-1EVP_PKEY_CTX\s0\fR is being duplicated. Refer to \fBEVP_PKEY_CTX_new\fR\|(3), \fBEVP_PKEY_CTX_new_id\fR\|(3), \&\fBEVP_PKEY_CTX_free\fR\|(3) and \fBEVP_PKEY_CTX_dup\fR\|(3). .PP .Vb 2 \& int (*paramgen_init) (EVP_PKEY_CTX *ctx); \& int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey); .Ve .PP The \fBparamgen_init()\fR and \fBparamgen()\fR methods deal with key parameter generation. They are called by \fBEVP_PKEY_paramgen_init\fR\|(3) and \fBEVP_PKEY_paramgen\fR\|(3) to handle the parameter generation process. .PP .Vb 2 \& int (*keygen_init) (EVP_PKEY_CTX *ctx); \& int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey); .Ve .PP The \fBkeygen_init()\fR and \fBkeygen()\fR methods are used to generate the actual key for the specified algorithm. They are called by \fBEVP_PKEY_keygen_init\fR\|(3) and \&\fBEVP_PKEY_keygen\fR\|(3). .PP .Vb 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); .Ve .PP The \fBsign_init()\fR and \fBsign()\fR methods are used to generate the signature of a piece of data using a private key. They are called by \fBEVP_PKEY_sign_init\fR\|(3) and \fBEVP_PKEY_sign\fR\|(3). .PP .Vb 4 \& 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); .Ve .PP The \fBverify_init()\fR and \fBverify()\fR methods are used to verify whether a signature is valid. They are called by \fBEVP_PKEY_verify_init\fR\|(3) and \fBEVP_PKEY_verify\fR\|(3). .PP .Vb 4 \& 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); .Ve .PP The \fBverify_recover_init()\fR and \fBverify_recover()\fR methods are used to verify a signature and then recover the digest from the signature (for instance, a signature that was generated by \s-1RSA\s0 signing algorithm). They are called by \&\fBEVP_PKEY_verify_recover_init\fR\|(3) and \fBEVP_PKEY_verify_recover\fR\|(3). .PP .Vb 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); .Ve .PP The \fBsignctx_init()\fR and \fBsignctx()\fR methods are used to sign a digest present by a \fB\s-1EVP_MD_CTX\s0\fR object. They are called by the EVP_DigestSign functions. See \&\fBEVP_DigestSignInit\fR\|(3) for details. .PP .Vb 3 \& 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); .Ve .PP The \fBverifyctx_init()\fR and \fBverifyctx()\fR methods are used to verify a signature against the data in a \fB\s-1EVP_MD_CTX\s0\fR object. They are called by the various EVP_DigestVerify functions. See \fBEVP_DigestVerifyInit\fR\|(3) for details. .PP .Vb 3 \& 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); .Ve .PP The \fBencrypt_init()\fR and \fBencrypt()\fR methods are used to encrypt a piece of data. They are called by \fBEVP_PKEY_encrypt_init\fR\|(3) and \fBEVP_PKEY_encrypt\fR\|(3). .PP .Vb 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); .Ve .PP The \fBdecrypt_init()\fR and \fBdecrypt()\fR methods are used to decrypt a piece of data. They are called by \fBEVP_PKEY_decrypt_init\fR\|(3) and \fBEVP_PKEY_decrypt\fR\|(3). .PP .Vb 2 \& int (*derive_init) (EVP_PKEY_CTX *ctx); \& int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen); .Ve .PP The \fBderive_init()\fR and \fBderive()\fR methods are used to derive the shared secret from a public key algorithm (for instance, the \s-1DH\s0 algorithm). They are called by \&\fBEVP_PKEY_derive_init\fR\|(3) and \fBEVP_PKEY_derive\fR\|(3). .PP .Vb 2 \& 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); .Ve .PP The \fBctrl()\fR and \fBctrl_str()\fR methods are used to adjust algorithm-specific settings. See \fBEVP_PKEY_CTX_ctrl\fR\|(3) and related functions for details. .PP .Vb 5 \& 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); .Ve .PP The \fBdigestsign()\fR and \fBdigestverify()\fR methods are used to generate or verify a signature in a one-shot mode. They could be called by \fBEVP_DigestSign\fR\|(3) and \fBEVP_DigestVerify\fR\|(3). .PP .Vb 3 \& int (*check) (EVP_PKEY *pkey); \& int (*public_check) (EVP_PKEY *pkey); \& int (*param_check) (EVP_PKEY *pkey); .Ve .PP The \fBcheck()\fR, \fBpublic_check()\fR and \fBparam_check()\fR methods are used to validate a key-pair, the public component and parameters respectively for a given \fBpkey\fR. They could be called by \fBEVP_PKEY_check\fR\|(3), \fBEVP_PKEY_public_check\fR\|(3) and \&\fBEVP_PKEY_param_check\fR\|(3) respectively. .PP .Vb 1 \& int (*digest_custom) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx); .Ve .PP The \fBdigest_custom()\fR method is used to generate customized digest content before the real message is passed to functions like \fBEVP_DigestSignUpdate\fR\|(3) or \&\fBEVP_DigestVerifyInit\fR\|(3). This is usually required by some public key signature algorithms like \s-1SM2\s0 which requires a hashed prefix to the message to be signed. The \fBdigest_custom()\fR function will be called by \fBEVP_DigestSignInit\fR\|(3) and \fBEVP_DigestVerifyInit\fR\|(3). .SS "Functions" .IX Subsection "Functions" \&\fBEVP_PKEY_meth_new()\fR creates and returns a new \fB\s-1EVP_PKEY_METHOD\s0\fR object, and associates the given \fBid\fR and \fBflags\fR. The following flags are supported: .PP .Vb 2 \& EVP_PKEY_FLAG_AUTOARGLEN \& EVP_PKEY_FLAG_SIGCTX_CUSTOM .Ve .PP If an \fB\s-1EVP_PKEY_METHOD\s0\fR is set with the \fB\s-1EVP_PKEY_FLAG_AUTOARGLEN\s0\fR flag, the maximum size of the output buffer will be automatically calculated or checked in corresponding \s-1EVP\s0 methods by the \s-1EVP\s0 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 \&\fBEVP_PKEY_sign\fR\|(3). .PP The \fB\s-1EVP_PKEY_FLAG_SIGCTX_CUSTOM\s0\fR is used to indicate the \fBsignctx()\fR method of an \fB\s-1EVP_PKEY_METHOD\s0\fR is always called by the \s-1EVP\s0 framework while doing a digest signing operation by calling \fBEVP_DigestSignFinal\fR\|(3). .PP \&\fBEVP_PKEY_meth_free()\fR frees an existing \fB\s-1EVP_PKEY_METHOD\s0\fR pointed by \&\fBpmeth\fR. .PP \&\fBEVP_PKEY_meth_copy()\fR copies an \fB\s-1EVP_PKEY_METHOD\s0\fR object from \fBsrc\fR to \fBdst\fR. .PP \&\fBEVP_PKEY_meth_find()\fR finds an \fB\s-1EVP_PKEY_METHOD\s0\fR object with the \fBid\fR. This function first searches through the user-defined method objects and then the built-in objects. .PP \&\fBEVP_PKEY_meth_add0()\fR adds \fBpmeth\fR to the user defined stack of methods. .PP \&\fBEVP_PKEY_meth_remove()\fR removes an \fB\s-1EVP_PKEY_METHOD\s0\fR object added by \&\fBEVP_PKEY_meth_add0()\fR. .PP The EVP_PKEY_meth_set functions set the corresponding fields of \&\fB\s-1EVP_PKEY_METHOD\s0\fR structure with the arguments passed. .PP The EVP_PKEY_meth_get functions get the corresponding fields of \&\fB\s-1EVP_PKEY_METHOD\s0\fR structure to the arguments provided. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEVP_PKEY_meth_new()\fR returns a pointer to a new \fB\s-1EVP_PKEY_METHOD\s0\fR object or returns \s-1NULL\s0 on error. .PP \&\fBEVP_PKEY_meth_free()\fR and \fBEVP_PKEY_meth_copy()\fR do not return values. .PP \&\fBEVP_PKEY_meth_find()\fR returns a pointer to the found \fB\s-1EVP_PKEY_METHOD\s0\fR object or returns \s-1NULL\s0 if not found. .PP \&\fBEVP_PKEY_meth_add0()\fR returns 1 if method is added successfully or 0 if an error occurred. .PP \&\fBEVP_PKEY_meth_remove()\fR returns 1 if method is removed successfully or 0 if an error occurred. .PP 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. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.