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.\" 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_ASN1_METHOD, EVP_PKEY_asn1_new, EVP_PKEY_asn1_copy, EVP_PKEY_asn1_free, EVP_PKEY_asn1_add0, EVP_PKEY_asn1_add_alias, EVP_PKEY_asn1_set_public, EVP_PKEY_asn1_set_private, EVP_PKEY_asn1_set_param, EVP_PKEY_asn1_set_free, EVP_PKEY_asn1_set_ctrl, EVP_PKEY_asn1_set_item, EVP_PKEY_asn1_set_siginf, EVP_PKEY_asn1_set_check, EVP_PKEY_asn1_set_public_check, EVP_PKEY_asn1_set_param_check, EVP_PKEY_asn1_set_security_bits, EVP_PKEY_asn1_set_set_priv_key, EVP_PKEY_asn1_set_set_pub_key, EVP_PKEY_asn1_set_get_priv_key, EVP_PKEY_asn1_set_get_pub_key, EVP_PKEY_get0_asn1 \&\- manipulating and registering EVP_PKEY_ASN1_METHOD structure .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& typedef struct evp_pkey_asn1_method_st EVP_PKEY_ASN1_METHOD; \& \& EVP_PKEY_ASN1_METHOD EVP_PKEY_asn1_new(int id, int flags, \& const char pem_str, \& const char info); \& void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD dst, \& const EVP_PKEY_ASN1_METHOD src); \& void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD ameth); \& int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD ameth); \& int EVP_PKEY_asn1_add_alias(int to, int from); \& \& void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD ameth, \& int (pub_decode) (EVP_PKEY pk, \& X509_PUBKEY pub), \& int (pub_encode) (X509_PUBKEY pub, \& const EVP_PKEY pk), \& int (pub_cmp) (const EVP_PKEY a, \& const EVP_PKEY b), \& int (pub_print) (BIO out, \& const EVP_PKEY pkey, \& int indent, ASN1_PCTX pctx), \& int (pkey_size) (const EVP_PKEY pk), \& int (pkey_bits) (const EVP_PKEY pk)); \& void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD ameth, \& int (priv_decode) (EVP_PKEY pk, \& const PKCS8_PRIV_KEY_INFO \& p8inf), \& int (priv_encode) (PKCS8_PRIV_KEY_INFO p8, \& const EVP_PKEY pk), \& int (priv_print) (BIO out, \& const EVP_PKEY pkey, \& int indent, \& ASN1_PCTX pctx)); \& void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD ameth, \& int (param_decode) (EVP_PKEY pkey, \& const unsigned char *pder, \& int derlen), \& int (param_encode) (const EVP_PKEY pkey, \& unsigned char pder), \& int (param_missing) (const EVP_PKEY pk), \& int (param_copy) (EVP_PKEY to, \& const EVP_PKEY from), \& int (param_cmp) (const EVP_PKEY a, \& const EVP_PKEY b), \& int (param_print) (BIO out, \& const EVP_PKEY pkey, \& int indent, \& ASN1_PCTX pctx)); \& \& void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD ameth, \& void (pkey_free) (EVP_PKEY pkey)); \& void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD ameth, \& int (pkey_ctrl) (EVP_PKEY pkey, int op, \& long arg1, void arg2)); \& void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD ameth, \& int (item_verify) (EVP_MD_CTX ctx, \& const ASN1_ITEM it, \& void asn, \& X509_ALGOR a, \& ASN1_BIT_STRING sig, \& EVP_PKEY pkey), \& int (item_sign) (EVP_MD_CTX ctx, \& const ASN1_ITEM it, \& void asn, \& X509_ALGOR alg1, \& X509_ALGOR alg2, \& ASN1_BIT_STRING sig)); \& \& void EVP_PKEY_asn1_set_siginf(EVP_PKEY_ASN1_METHOD ameth, \& int (siginf_set) (X509_SIG_INFO siginf, \& const X509_ALGOR alg, \& const ASN1_STRING sig)); \& \& void EVP_PKEY_asn1_set_check(EVP_PKEY_ASN1_METHOD ameth, \& int (pkey_check) (const EVP_PKEY pk)); \& \& void EVP_PKEY_asn1_set_public_check(EVP_PKEY_ASN1_METHOD ameth, \& int (pkey_pub_check) (const EVP_PKEY pk)); \& \& void EVP_PKEY_asn1_set_param_check(EVP_PKEY_ASN1_METHOD ameth, \& int (pkey_param_check) (const EVP_PKEY pk)); \& \& void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD ameth, \& int (pkey_security_bits) (const EVP_PKEY \& pk)); \& \& void EVP_PKEY_asn1_set_set_priv_key(EVP_PKEY_ASN1_METHOD ameth, \& int (set_priv_key) (EVP_PKEY pk, \& const unsigned char \& priv, \& size_t len)); \& \& void EVP_PKEY_asn1_set_set_pub_key(EVP_PKEY_ASN1_METHOD ameth, \& int (set_pub_key) (EVP_PKEY pk, \& const unsigned char pub, \& size_t len)); \& \& void EVP_PKEY_asn1_set_get_priv_key(EVP_PKEY_ASN1_METHOD ameth, \& int (get_priv_key) (const EVP_PKEY pk, \& unsigned char priv, \& size_t len)); \& \& void EVP_PKEY_asn1_set_get_pub_key(EVP_PKEY_ASN1_METHOD ameth, \& int (get_pub_key) (const EVP_PKEY pk, \& unsigned char pub, \& size_t len)); \& \& const EVP_PKEY_ASN1_METHOD EVP_PKEY_get0_asn1(const EVP_PKEY pkey); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR is a structure which holds a set of \s-1ASN.1\s0 conversion, printing and information methods for a specific public key algorithm. .PP There are two places where the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR objects are stored: one is a built-in 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_asn1_add0\fR\\|(3). .SS "Methods" .IX Subsection "Methods" The methods are the underlying implementations of a particular public key algorithm present by the \fB\s-1EVP_PKEY\s0\fR object. .PP .Vb 5 \& int (pub_decode) (EVP_PKEY pk, X509_PUBKEY pub); \& int (pub_encode) (X509_PUBKEY pub, const EVP_PKEY pk); \& int (pub_cmp) (const EVP_PKEY a, const EVP_PKEY b); \& int (pub_print) (BIO out, const EVP_PKEY pkey, int indent, \& ASN1_PCTX pctx); .Ve .PP The \fBpub_decode()\fR and \fBpub_encode()\fR methods are called to decode / encode \fBX509_PUBKEY\fR \s-1ASN.1\s0 parameters to / from \fBpk\fR. They \s-1MUST\s0 return 0 on error, 1 on success. They're called by \fBX509_PUBKEY_get0\fR\\|(3) and \fBX509_PUBKEY_set\fR\\|(3). .PP The \fBpub_cmp()\fR method is called when two public keys are to be compared. It \s-1MUST\s0 return 1 when the keys are equal, 0 otherwise. It's called by \fBEVP_PKEY_cmp\fR\\|(3). .PP The \fBpub_print()\fR method is called to print a public key in humanly readable text to \fBout\fR, indented \fBindent\fR spaces. It \s-1MUST\s0 return 0 on error, 1 on success. It's called by \fBEVP_PKEY_print_public\fR\\|(3). .PP .Vb 4 \& int (priv_decode) (EVP_PKEY pk, const PKCS8_PRIV_KEY_INFO p8inf); \& int (priv_encode) (PKCS8_PRIV_KEY_INFO p8, const EVP_PKEY pk); \& int (priv_print) (BIO out, const EVP_PKEY pkey, int indent, \& ASN1_PCTX pctx); .Ve .PP The \fBpriv_decode()\fR and \fBpriv_encode()\fR methods are called to decode / encode \fB\s-1PKCS8_PRIV_KEY_INFO\s0\fR form private key to / from \fBpk\fR. They \s-1MUST\s0 return 0 on error, 1 on success. They're called by \s-1\fBEVP_PKCS82PKEY\s0\fR\\|(3) and \s-1\fBEVP_PKEY2PKCS8\s0\fR\\|(3). .PP The \fBpriv_print()\fR method is called to print a private key in humanly readable text to \fBout\fR, indented \fBindent\fR spaces. It \s-1MUST\s0 return 0 on error, 1 on success. It's called by \fBEVP_PKEY_print_private\fR\\|(3). .PP .Vb 3 \& int (pkey_size) (const EVP_PKEY pk); \& int (pkey_bits) (const EVP_PKEY pk); \& int (pkey_security_bits) (const EVP_PKEY pk); .Ve .PP The \fBpkey_size()\fR method returns the key size in bytes. It's called by \fBEVP_PKEY_size\fR\\|(3). .PP The \fBpkey_bits()\fR method returns the key size in bits. It's called by \fBEVP_PKEY_bits\fR\\|(3). .PP .Vb 8 \& int (param_decode) (EVP_PKEY pkey, \& const unsigned char pder, int derlen); \& int (param_encode) (const EVP_PKEY pkey, unsigned char pder); \& int (param_missing) (const EVP_PKEY pk); \& int (param_copy) (EVP_PKEY to, const EVP_PKEY from); \& int (param_cmp) (const EVP_PKEY a, const EVP_PKEY b); \& int (param_print) (BIO out, const EVP_PKEY pkey, int indent, \& ASN1_PCTX pctx); .Ve .PP The \fBparam_decode()\fR and \fBparam_encode()\fR methods are called to decode / encode \s-1DER\s0 formatted parameters to / from \fBpk\fR. They \s-1MUST\s0 return 0 on error, 1 on success. They're called by \fBPEM_read_bio_Parameters\fR\\|(3) and the \fBfile:\fR \&\s-1\fBOSSL_STORE_LOADER\s0\fR\\|(3). .PP The \fBparam_missing()\fR method returns 0 if a key parameter is missing, otherwise 1. It's called by \fBEVP_PKEY_missing_parameters\fR\\|(3). .PP The \fBparam_copy()\fR method copies key parameters from \fBfrom\fR to \fBto\fR. It \s-1MUST\s0 return 0 on error, 1 on success. It's called by \fBEVP_PKEY_copy_parameters\fR\\|(3). .PP The \fBparam_cmp()\fR method compares the parameters of keys \fBa\fR and \fBb\fR. It \s-1MUST\s0 return 1 when the keys are equal, 0 when not equal, or a negative number on error. It's called by \fBEVP_PKEY_cmp_parameters\fR\\|(3). .PP The \fBparam_print()\fR method prints the private key parameters in humanly readable text to \fBout\fR, indented \fBindent\fR spaces. It \s-1MUST\s0 return 0 on error, 1 on success. It's called by \fBEVP_PKEY_print_params\fR\\|(3). .PP .Vb 3 \& int (sig_print) (BIO out, \& const X509_ALGOR sigalg, const ASN1_STRING sig, \& int indent, ASN1_PCTX pctx); .Ve .PP The \fBsig_print()\fR method prints a signature in humanly readable text to \&\fBout\fR, indented \fBindent\fR spaces. \&\fBsigalg\fR contains the exact signature algorithm. If the signature in \fBsig\fR doesn't correspond to what this method expects, \fBX509_signature_dump()\fR must be used as a last resort. It \s-1MUST\s0 return 0 on error, 1 on success. It's called by \fBX509_signature_print\fR\\|(3). .PP .Vb 1 \& void (pkey_free) (EVP_PKEY pkey); .Ve .PP The \fBpkey_free()\fR method helps freeing the internals of \fBpkey\fR. It's called by \fBEVP_PKEY_free\fR\\|(3), \fBEVP_PKEY_set_type\fR\\|(3), \&\fBEVP_PKEY_set_type_str\fR\\|(3), and \fBEVP_PKEY_assign\fR\\|(3). .PP .Vb 1 \& int (pkey_ctrl) (EVP_PKEY pkey, int op, long arg1, void arg2); .Ve .PP The \fBpkey_ctrl()\fR method adds extra algorithm specific control. It's called by \fBEVP_PKEY_get_default_digest_nid\fR\\|(3), \&\fBEVP_PKEY_set1_tls_encodedpoint\fR\\|(3), \&\fBEVP_PKEY_get1_tls_encodedpoint\fR\\|(3), \fBPKCS7_SIGNER_INFO_set\fR\\|(3), \&\fBPKCS7_RECIP_INFO_set\fR\\|(3), ... .PP .Vb 3 \& int (old_priv_decode) (EVP_PKEY pkey, \& const unsigned char pder, int derlen); \& int (old_priv_encode) (const EVP_PKEY pkey, unsigned char pder); .Ve .PP The \fBold_priv_decode()\fR and \fBold_priv_encode()\fR methods decode / encode they private key \fBpkey\fR from / to a \s-1DER\s0 formatted array. These are exclusively used to help decoding / encoding older (pre PKCS#8) \s-1PEM\s0 formatted encrypted private keys. \&\fBold_priv_decode()\fR \s-1MUST\s0 return 0 on error, 1 on success. \&\fBold_priv_encode()\fR \s-1MUST\s0 the return same kind of values as \&\fBi2d_PrivateKey()\fR. They're called by \fBd2i_PrivateKey\fR\\|(3) and \fBi2d_PrivateKey\fR\\|(3). .PP .Vb 5 \& int (item_verify) (EVP_MD_CTX ctx, const ASN1_ITEM it, void asn, \& X509_ALGOR a, ASN1_BIT_STRING sig, EVP_PKEY pkey); \& int (item_sign) (EVP_MD_CTX ctx, const ASN1_ITEM it, void asn, \& X509_ALGOR alg1, X509_ALGOR alg2, \& ASN1_BIT_STRING sig); .Ve .PP The \fBitem_sign()\fR and \fBitem_verify()\fR methods make it possible to have algorithm specific signatures and verification of them. .PP \&\fBitem_sign()\fR \s-1MUST\s0 return one of: .IP "<=0" 4 .IX Item "<=0" error .IP "1" 4 .IX Item "1" \&\fBitem_sign()\fR did everything, OpenSSL internals just needs to pass the signature length back. .IP "2" 4 .IX Item "2" \&\fBitem_sign()\fR did nothing, OpenSSL internal standard routines are expected to continue with the default signature production. .IP "3" 4 .IX Item "3" \&\fBitem_sign()\fR set the algorithm identifier \fBalgor1\fR and \fBalgor2\fR, OpenSSL internals should just sign using those algorithms. .PP \&\fBitem_verify()\fR \s-1MUST\s0 return one of: .IP "<=0" 4 .IX Item "<=0" error .IP "1" 4 .IX Item "1" \&\fBitem_sign()\fR did everything, OpenSSL internals just needs to pass the signature length back. .IP "2" 4 .IX Item "2" \&\fBitem_sign()\fR did nothing, OpenSSL internal standard routines are expected to continue with the default signature production. .PP \&\fBitem_verify()\fR and \fBitem_sign()\fR are called by \fBASN1_item_verify\fR\\|(3) and \&\fBASN1_item_sign\fR\\|(3), and by extension, \fBX509_verify\fR\\|(3), \&\fBX509_REQ_verify\fR\\|(3), \fBX509_sign\fR\\|(3), \fBX509_REQ_sign\fR\\|(3), ... .PP .Vb 2 \& int (siginf_set) (X509_SIG_INFO siginf, const X509_ALGOR alg, \& const ASN1_STRING sig); .Ve .PP The \fBsiginf_set()\fR method is used to set custom \fBX509_SIG_INFO\fR parameters. It \s-1MUST\s0 return 0 on error, or 1 on success. It's called as part of \fBX509_check_purpose\fR\\|(3), \fBX509_check_ca\fR\\|(3) and \fBX509_check_issued\fR\\|(3). .PP .Vb 3 \& int (pkey_check) (const EVP_PKEY pk); \& int (pkey_public_check) (const EVP_PKEY pk); \& int (pkey_param_check) (const EVP_PKEY pk); .Ve .PP The \fBpkey_check()\fR, \fBpkey_public_check()\fR and \fBpkey_param_check()\fR methods are used to check the validity of \fBpk\fR for key-pair, public component and parameters, respectively. They \s-1MUST\s0 return 0 for an invalid key, or 1 for a valid key. They are called by \fBEVP_PKEY_check\fR\\|(3), \fBEVP_PKEY_public_check\fR\\|(3) and \&\fBEVP_PKEY_param_check\fR\\|(3) respectively. .PP .Vb 2 \& int (set_priv_key) (EVP_PKEY pk, const unsigned char priv, size_t len); \& int (set_pub_key) (EVP_PKEY pk, const unsigned char pub, size_t len); .Ve .PP The \fBset_priv_key()\fR and \fBset_pub_key()\fR methods are used to set the raw private and public key data for an \s-1EVP_PKEY.\s0 They \s-1MUST\s0 return 0 on error, or 1 on success. They are called by \fBEVP_PKEY_new_raw_private_key\fR\\|(3), and \&\fBEVP_PKEY_new_raw_public_key\fR\\|(3) respectively. .SS "Functions" .IX Subsection "Functions" \&\fBEVP_PKEY_asn1_new()\fR creates and returns a new \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object, and associates the given \fBid\fR, \fBflags\fR, \fBpem_str\fR and \&\fBinfo\fR. \&\fBid\fR is a \s-1NID,\s0 \fBpem_str\fR is the \s-1PEM\s0 type string, \fBinfo\fR is a descriptive string. The following \fBflags\fR are supported: .PP .Vb 1 \& ASN1_PKEY_SIGPARAM_NULL .Ve .PP If \fB\s-1ASN1_PKEY_SIGPARAM_NULL\s0\fR is set, then the signature algorithm parameters are given the type \fBV_ASN1_NULL\fR by default, otherwise they will be given the type \fBV_ASN1_UNDEF\fR (i.e. the parameter is omitted). See \fBX509_ALGOR_set0\fR\\|(3) for more information. .PP \&\fBEVP_PKEY_asn1_copy()\fR copies an \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object from \&\fBsrc\fR to \fBdst\fR. This function is not thread safe, it's recommended to only use this when initializing the application. .PP \&\fBEVP_PKEY_asn1_free()\fR frees an existing \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR pointed by \fBameth\fR. .PP \&\fBEVP_PKEY_asn1_add0()\fR adds \fBameth\fR to the user defined stack of methods unless another \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with the same \s-1NID\s0 is already there. This function is not thread safe, it's recommended to only use this when initializing the application. .PP \&\fBEVP_PKEY_asn1_add_alias()\fR creates an alias with the \s-1NID\s0 \fBto\fR for the \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with \s-1NID\s0 \fBfrom\fR unless another \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with the same \s-1NID\s0 is already added. This function is not thread safe, it's recommended to only use this when initializing the application. .PP \&\fBEVP_PKEY_asn1_set_public()\fR, \fBEVP_PKEY_asn1_set_private()\fR, \&\fBEVP_PKEY_asn1_set_param()\fR, \fBEVP_PKEY_asn1_set_free()\fR, \&\fBEVP_PKEY_asn1_set_ctrl()\fR, \fBEVP_PKEY_asn1_set_item()\fR, \&\fBEVP_PKEY_asn1_set_siginf()\fR, \fBEVP_PKEY_asn1_set_check()\fR, \&\fBEVP_PKEY_asn1_set_public_check()\fR, \fBEVP_PKEY_asn1_set_param_check()\fR, \&\fBEVP_PKEY_asn1_set_security_bits()\fR, \fBEVP_PKEY_asn1_set_set_priv_key()\fR, \&\fBEVP_PKEY_asn1_set_set_pub_key()\fR, \fBEVP_PKEY_asn1_set_get_priv_key()\fR and \&\fBEVP_PKEY_asn1_set_get_pub_key()\fR set the diverse methods of the given \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object. .PP \&\fBEVP_PKEY_get0_asn1()\fR finds the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR associated with the key \fBpkey\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEVP_PKEY_asn1_new()\fR returns \s-1NULL\s0 on error, or a pointer to an \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object otherwise. .PP \&\fBEVP_PKEY_asn1_add0()\fR and \fBEVP_PKEY_asn1_add_alias()\fR return 0 on error, or 1 on success. .PP \&\fBEVP_PKEY_get0_asn1()\fR returns \s-1NULL\s0 on error, or a pointer to a constant \&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object otherwise. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2018 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>. Back

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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_ASN1_METHOD 3"
.TH EVP_PKEY_ASN1_METHOD 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
EVP_PKEY_ASN1_METHOD, EVP_PKEY_asn1_new, EVP_PKEY_asn1_copy, EVP_PKEY_asn1_free, EVP_PKEY_asn1_add0, EVP_PKEY_asn1_add_alias, EVP_PKEY_asn1_set_public, EVP_PKEY_asn1_set_private, EVP_PKEY_asn1_set_param, EVP_PKEY_asn1_set_free, EVP_PKEY_asn1_set_ctrl, EVP_PKEY_asn1_set_item, EVP_PKEY_asn1_set_siginf, EVP_PKEY_asn1_set_check, EVP_PKEY_asn1_set_public_check, EVP_PKEY_asn1_set_param_check, EVP_PKEY_asn1_set_security_bits, EVP_PKEY_asn1_set_set_priv_key, EVP_PKEY_asn1_set_set_pub_key, EVP_PKEY_asn1_set_get_priv_key, EVP_PKEY_asn1_set_get_pub_key, EVP_PKEY_get0_asn1 \&\- manipulating and registering EVP_PKEY_ASN1_METHOD structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& typedef struct evp_pkey_asn1_method_st EVP_PKEY_ASN1_METHOD;
\&
\& EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
\&                                         const char *pem_str,
\&                                         const char *info);
\& void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
\&                         const EVP_PKEY_ASN1_METHOD *src);
\& void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth);
\& int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth);
\& int EVP_PKEY_asn1_add_alias(int to, int from);
\&
\& void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
\&                               int (*pub_decode) (EVP_PKEY *pk,
\&                                                  X509_PUBKEY *pub),
\&                               int (*pub_encode) (X509_PUBKEY *pub,
\&                                                  const EVP_PKEY *pk),
\&                               int (*pub_cmp) (const EVP_PKEY *a,
\&                                               const EVP_PKEY *b),
\&                               int (*pub_print) (BIO *out,
\&                                                 const EVP_PKEY *pkey,
\&                                                 int indent, ASN1_PCTX *pctx),
\&                               int (*pkey_size) (const EVP_PKEY *pk),
\&                               int (*pkey_bits) (const EVP_PKEY *pk));
\& void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
\&                                int (*priv_decode) (EVP_PKEY *pk,
\&                                                    const PKCS8_PRIV_KEY_INFO
\&                                                    *p8inf),
\&                                int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
\&                                                    const EVP_PKEY *pk),
\&                                int (*priv_print) (BIO *out,
\&                                                   const EVP_PKEY *pkey,
\&                                                   int indent,
\&                                                   ASN1_PCTX *pctx));
\& void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
\&                              int (*param_decode) (EVP_PKEY *pkey,
\&                                                   const unsigned char **pder,
\&                                                   int derlen),
\&                              int (*param_encode) (const EVP_PKEY *pkey,
\&                                                   unsigned char **pder),
\&                              int (*param_missing) (const EVP_PKEY *pk),
\&                              int (*param_copy) (EVP_PKEY *to,
\&                                                 const EVP_PKEY *from),
\&                              int (*param_cmp) (const EVP_PKEY *a,
\&                                                const EVP_PKEY *b),
\&                              int (*param_print) (BIO *out,
\&                                                  const EVP_PKEY *pkey,
\&                                                  int indent,
\&                                                  ASN1_PCTX *pctx));
\&
\& void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
\&                             void (*pkey_free) (EVP_PKEY *pkey));
\& void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
\&                             int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
\&                                               long arg1, void *arg2));
\& void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
\&                             int (*item_verify) (EVP_MD_CTX *ctx,
\&                                                 const ASN1_ITEM *it,
\&                                                 void *asn,
\&                                                 X509_ALGOR *a,
\&                                                 ASN1_BIT_STRING *sig,
\&                                                 EVP_PKEY *pkey),
\&                             int (*item_sign) (EVP_MD_CTX *ctx,
\&                                               const ASN1_ITEM *it,
\&                                               void *asn,
\&                                               X509_ALGOR *alg1,
\&                                               X509_ALGOR *alg2,
\&                                               ASN1_BIT_STRING *sig));
\&
\& void EVP_PKEY_asn1_set_siginf(EVP_PKEY_ASN1_METHOD *ameth,
\&                               int (*siginf_set) (X509_SIG_INFO *siginf,
\&                                                  const X509_ALGOR *alg,
\&                                                  const ASN1_STRING *sig));
\&
\& void EVP_PKEY_asn1_set_check(EVP_PKEY_ASN1_METHOD *ameth,
\&                              int (*pkey_check) (const EVP_PKEY *pk));
\&
\& void EVP_PKEY_asn1_set_public_check(EVP_PKEY_ASN1_METHOD *ameth,
\&                                     int (*pkey_pub_check) (const EVP_PKEY *pk));
\&
\& void EVP_PKEY_asn1_set_param_check(EVP_PKEY_ASN1_METHOD *ameth,
\&                                    int (*pkey_param_check) (const EVP_PKEY *pk));
\&
\& void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
\&                                      int (*pkey_security_bits) (const EVP_PKEY
\&                                                                 *pk));
\&
\& void EVP_PKEY_asn1_set_set_priv_key(EVP_PKEY_ASN1_METHOD *ameth,
\&                                     int (*set_priv_key) (EVP_PKEY *pk,
\&                                                          const unsigned char
\&                                                             *priv,
\&                                                          size_t len));
\&
\& void EVP_PKEY_asn1_set_set_pub_key(EVP_PKEY_ASN1_METHOD *ameth,
\&                                    int (*set_pub_key) (EVP_PKEY *pk,
\&                                                        const unsigned char *pub,
\&                                                        size_t len));
\&
\& void EVP_PKEY_asn1_set_get_priv_key(EVP_PKEY_ASN1_METHOD *ameth,
\&                                     int (*get_priv_key) (const EVP_PKEY *pk,
\&                                                          unsigned char *priv,
\&                                                          size_t *len));
\&
\& void EVP_PKEY_asn1_set_get_pub_key(EVP_PKEY_ASN1_METHOD *ameth,
\&                                    int (*get_pub_key) (const EVP_PKEY *pk,
\&                                                        unsigned char *pub,
\&                                                        size_t *len));
\&
\& const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(const EVP_PKEY *pkey);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR is a structure which holds a set of \s-1ASN.1\s0
conversion, printing and information methods for a specific public key
algorithm.
.PP
There are two places where the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR objects are
stored: one is a built-in 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_asn1_add0\fR\|(3).
.SS "Methods"
.IX Subsection "Methods"
The methods are the underlying implementations of a particular public
key algorithm present by the \fB\s-1EVP_PKEY\s0\fR object.
.PP
.Vb 5
\& int (*pub_decode) (EVP_PKEY *pk, X509_PUBKEY *pub);
\& int (*pub_encode) (X509_PUBKEY *pub, const EVP_PKEY *pk);
\& int (*pub_cmp) (const EVP_PKEY *a, const EVP_PKEY *b);
\& int (*pub_print) (BIO *out, const EVP_PKEY *pkey, int indent,
\&                   ASN1_PCTX *pctx);
.Ve
.PP
The \fBpub_decode()\fR and \fBpub_encode()\fR methods are called to decode /
encode \fBX509_PUBKEY\fR \s-1ASN.1\s0 parameters to / from \fBpk\fR.
They \s-1MUST\s0 return 0 on error, 1 on success.
They're called by \fBX509_PUBKEY_get0\fR\|(3) and \fBX509_PUBKEY_set\fR\|(3).
.PP
The \fBpub_cmp()\fR method is called when two public keys are to be
compared.
It \s-1MUST\s0 return 1 when the keys are equal, 0 otherwise.
It's called by \fBEVP_PKEY_cmp\fR\|(3).
.PP
The \fBpub_print()\fR method is called to print a public key in humanly
readable text to \fBout\fR, indented \fBindent\fR spaces.
It \s-1MUST\s0 return 0 on error, 1 on success.
It's called by \fBEVP_PKEY_print_public\fR\|(3).
.PP
.Vb 4
\& int (*priv_decode) (EVP_PKEY *pk, const PKCS8_PRIV_KEY_INFO *p8inf);
\& int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk);
\& int (*priv_print) (BIO *out, const EVP_PKEY *pkey, int indent,
\&                    ASN1_PCTX *pctx);
.Ve
.PP
The \fBpriv_decode()\fR and \fBpriv_encode()\fR methods are called to decode /
encode \fB\s-1PKCS8_PRIV_KEY_INFO\s0\fR form private key to / from \fBpk\fR.
They \s-1MUST\s0 return 0 on error, 1 on success.
They're called by \s-1\fBEVP_PKCS82PKEY\s0\fR\|(3) and \s-1\fBEVP_PKEY2PKCS8\s0\fR\|(3).
.PP
The \fBpriv_print()\fR method is called to print a private key in humanly
readable text to \fBout\fR, indented \fBindent\fR spaces.
It \s-1MUST\s0 return 0 on error, 1 on success.
It's called by \fBEVP_PKEY_print_private\fR\|(3).
.PP
.Vb 3
\& int (*pkey_size) (const EVP_PKEY *pk);
\& int (*pkey_bits) (const EVP_PKEY *pk);
\& int (*pkey_security_bits) (const EVP_PKEY *pk);
.Ve
.PP
The \fBpkey_size()\fR method returns the key size in bytes.
It's called by \fBEVP_PKEY_size\fR\|(3).
.PP
The \fBpkey_bits()\fR method returns the key size in bits.
It's called by \fBEVP_PKEY_bits\fR\|(3).
.PP
.Vb 8
\& int (*param_decode) (EVP_PKEY *pkey,
\&                      const unsigned char **pder, int derlen);
\& int (*param_encode) (const EVP_PKEY *pkey, unsigned char **pder);
\& int (*param_missing) (const EVP_PKEY *pk);
\& int (*param_copy) (EVP_PKEY *to, const EVP_PKEY *from);
\& int (*param_cmp) (const EVP_PKEY *a, const EVP_PKEY *b);
\& int (*param_print) (BIO *out, const EVP_PKEY *pkey, int indent,
\&                     ASN1_PCTX *pctx);
.Ve
.PP
The \fBparam_decode()\fR and \fBparam_encode()\fR methods are called to decode /
encode \s-1DER\s0 formatted parameters to / from \fBpk\fR.
They \s-1MUST\s0 return 0 on error, 1 on success.
They're called by \fBPEM_read_bio_Parameters\fR\|(3) and the \fBfile:\fR
\&\s-1\fBOSSL_STORE_LOADER\s0\fR\|(3).
.PP
The \fBparam_missing()\fR method returns 0 if a key parameter is missing,
otherwise 1.
It's called by \fBEVP_PKEY_missing_parameters\fR\|(3).
.PP
The \fBparam_copy()\fR method copies key parameters from \fBfrom\fR to \fBto\fR.
It \s-1MUST\s0 return 0 on error, 1 on success.
It's called by \fBEVP_PKEY_copy_parameters\fR\|(3).
.PP
The \fBparam_cmp()\fR method compares the parameters of keys \fBa\fR and \fBb\fR.
It \s-1MUST\s0 return 1 when the keys are equal, 0 when not equal, or a
negative number on error.
It's called by \fBEVP_PKEY_cmp_parameters\fR\|(3).
.PP
The \fBparam_print()\fR method prints the private key parameters in humanly
readable text to \fBout\fR, indented \fBindent\fR spaces.
It \s-1MUST\s0 return 0 on error, 1 on success.
It's called by \fBEVP_PKEY_print_params\fR\|(3).
.PP
.Vb 3
\& int (*sig_print) (BIO *out,
\&                   const X509_ALGOR *sigalg, const ASN1_STRING *sig,
\&                   int indent, ASN1_PCTX *pctx);
.Ve
.PP
The \fBsig_print()\fR method prints a signature in humanly readable text to
\&\fBout\fR, indented \fBindent\fR spaces.
\&\fBsigalg\fR contains the exact signature algorithm.
If the signature in \fBsig\fR doesn't correspond to what this method
expects, \fBX509_signature_dump()\fR must be used as a last resort.
It \s-1MUST\s0 return 0 on error, 1 on success.
It's called by \fBX509_signature_print\fR\|(3).
.PP
.Vb 1
\& void (*pkey_free) (EVP_PKEY *pkey);
.Ve
.PP
The \fBpkey_free()\fR method helps freeing the internals of \fBpkey\fR.
It's called by \fBEVP_PKEY_free\fR\|(3), \fBEVP_PKEY_set_type\fR\|(3),
\&\fBEVP_PKEY_set_type_str\fR\|(3), and \fBEVP_PKEY_assign\fR\|(3).
.PP
.Vb 1
\& int (*pkey_ctrl) (EVP_PKEY *pkey, int op, long arg1, void *arg2);
.Ve
.PP
The \fBpkey_ctrl()\fR method adds extra algorithm specific control.
It's called by \fBEVP_PKEY_get_default_digest_nid\fR\|(3),
\&\fBEVP_PKEY_set1_tls_encodedpoint\fR\|(3),
\&\fBEVP_PKEY_get1_tls_encodedpoint\fR\|(3), \fBPKCS7_SIGNER_INFO_set\fR\|(3),
\&\fBPKCS7_RECIP_INFO_set\fR\|(3), ...
.PP
.Vb 3
\& int (*old_priv_decode) (EVP_PKEY *pkey,
\&                         const unsigned char **pder, int derlen);
\& int (*old_priv_encode) (const EVP_PKEY *pkey, unsigned char **pder);
.Ve
.PP
The \fBold_priv_decode()\fR and \fBold_priv_encode()\fR methods decode / encode
they private key \fBpkey\fR from / to a \s-1DER\s0 formatted array.
These are exclusively used to help decoding / encoding older (pre
PKCS#8) \s-1PEM\s0 formatted encrypted private keys.
\&\fBold_priv_decode()\fR \s-1MUST\s0 return 0 on error, 1 on success.
\&\fBold_priv_encode()\fR \s-1MUST\s0 the return same kind of values as
\&\fBi2d_PrivateKey()\fR.
They're called by \fBd2i_PrivateKey\fR\|(3) and \fBi2d_PrivateKey\fR\|(3).
.PP
.Vb 5
\& int (*item_verify) (EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
\&                     X509_ALGOR *a, ASN1_BIT_STRING *sig, EVP_PKEY *pkey);
\& int (*item_sign) (EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
\&                   X509_ALGOR *alg1, X509_ALGOR *alg2,
\&                   ASN1_BIT_STRING *sig);
.Ve
.PP
The \fBitem_sign()\fR and  \fBitem_verify()\fR methods make it possible to have
algorithm specific signatures and verification of them.
.PP
\&\fBitem_sign()\fR \s-1MUST\s0 return one of:
.IP "<=0" 4
.IX Item "<=0"
error
.IP "1" 4
.IX Item "1"
\&\fBitem_sign()\fR did everything, OpenSSL internals just needs to pass the
signature length back.
.IP "2" 4
.IX Item "2"
\&\fBitem_sign()\fR did nothing, OpenSSL internal standard routines are
expected to continue with the default signature production.
.IP "3" 4
.IX Item "3"
\&\fBitem_sign()\fR set the algorithm identifier \fBalgor1\fR and \fBalgor2\fR,
OpenSSL internals should just sign using those algorithms.
.PP
\&\fBitem_verify()\fR \s-1MUST\s0 return one of:
.IP "<=0" 4
.IX Item "<=0"
error
.IP "1" 4
.IX Item "1"
\&\fBitem_sign()\fR did everything, OpenSSL internals just needs to pass the
signature length back.
.IP "2" 4
.IX Item "2"
\&\fBitem_sign()\fR did nothing, OpenSSL internal standard routines are
expected to continue with the default signature production.
.PP
\&\fBitem_verify()\fR and \fBitem_sign()\fR are called by \fBASN1_item_verify\fR\|(3) and
\&\fBASN1_item_sign\fR\|(3), and by extension, \fBX509_verify\fR\|(3),
\&\fBX509_REQ_verify\fR\|(3), \fBX509_sign\fR\|(3), \fBX509_REQ_sign\fR\|(3), ...
.PP
.Vb 2
\& int (*siginf_set) (X509_SIG_INFO *siginf, const X509_ALGOR *alg,
\&                    const ASN1_STRING *sig);
.Ve
.PP
The \fBsiginf_set()\fR method is used to set custom \fBX509_SIG_INFO\fR
parameters.
It \s-1MUST\s0 return 0 on error, or 1 on success.
It's called as part of \fBX509_check_purpose\fR\|(3), \fBX509_check_ca\fR\|(3)
and \fBX509_check_issued\fR\|(3).
.PP
.Vb 3
\& int (*pkey_check) (const EVP_PKEY *pk);
\& int (*pkey_public_check) (const EVP_PKEY *pk);
\& int (*pkey_param_check) (const EVP_PKEY *pk);
.Ve
.PP
The \fBpkey_check()\fR, \fBpkey_public_check()\fR and \fBpkey_param_check()\fR methods are used
to check the validity of \fBpk\fR for key-pair, public component and parameters,
respectively.
They \s-1MUST\s0 return 0 for an invalid key, or 1 for a valid key.
They are called by \fBEVP_PKEY_check\fR\|(3), \fBEVP_PKEY_public_check\fR\|(3) and
\&\fBEVP_PKEY_param_check\fR\|(3) respectively.
.PP
.Vb 2
\& int (*set_priv_key) (EVP_PKEY *pk, const unsigned char *priv, size_t len);
\& int (*set_pub_key) (EVP_PKEY *pk, const unsigned char *pub, size_t len);
.Ve
.PP
The \fBset_priv_key()\fR and \fBset_pub_key()\fR methods are used to set the raw private and
public key data for an \s-1EVP_PKEY.\s0 They \s-1MUST\s0 return 0 on error, or 1 on success.
They are called by \fBEVP_PKEY_new_raw_private_key\fR\|(3), and
\&\fBEVP_PKEY_new_raw_public_key\fR\|(3) respectively.
.SS "Functions"
.IX Subsection "Functions"
\&\fBEVP_PKEY_asn1_new()\fR creates and returns a new \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR
object, and associates the given \fBid\fR, \fBflags\fR, \fBpem_str\fR and
\&\fBinfo\fR.
\&\fBid\fR is a \s-1NID,\s0 \fBpem_str\fR is the \s-1PEM\s0 type string, \fBinfo\fR is a
descriptive string.
The following \fBflags\fR are supported:
.PP
.Vb 1
\& ASN1_PKEY_SIGPARAM_NULL
.Ve
.PP
If \fB\s-1ASN1_PKEY_SIGPARAM_NULL\s0\fR is set, then the signature algorithm
parameters are given the type \fBV_ASN1_NULL\fR by default, otherwise
they will be given the type \fBV_ASN1_UNDEF\fR (i.e. the parameter is
omitted).
See \fBX509_ALGOR_set0\fR\|(3) for more information.
.PP
\&\fBEVP_PKEY_asn1_copy()\fR copies an \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object from
\&\fBsrc\fR to \fBdst\fR.
This function is not thread safe, it's recommended to only use this
when initializing the application.
.PP
\&\fBEVP_PKEY_asn1_free()\fR frees an existing \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR pointed
by \fBameth\fR.
.PP
\&\fBEVP_PKEY_asn1_add0()\fR adds \fBameth\fR to the user defined stack of
methods unless another \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with the same \s-1NID\s0 is
already there.
This function is not thread safe, it's recommended to only use this
when initializing the application.
.PP
\&\fBEVP_PKEY_asn1_add_alias()\fR creates an alias with the \s-1NID\s0 \fBto\fR for the
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with \s-1NID\s0 \fBfrom\fR unless another
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with the same \s-1NID\s0 is already added.
This function is not thread safe, it's recommended to only use this
when initializing the application.
.PP
\&\fBEVP_PKEY_asn1_set_public()\fR, \fBEVP_PKEY_asn1_set_private()\fR,
\&\fBEVP_PKEY_asn1_set_param()\fR, \fBEVP_PKEY_asn1_set_free()\fR,
\&\fBEVP_PKEY_asn1_set_ctrl()\fR, \fBEVP_PKEY_asn1_set_item()\fR,
\&\fBEVP_PKEY_asn1_set_siginf()\fR, \fBEVP_PKEY_asn1_set_check()\fR,
\&\fBEVP_PKEY_asn1_set_public_check()\fR, \fBEVP_PKEY_asn1_set_param_check()\fR,
\&\fBEVP_PKEY_asn1_set_security_bits()\fR, \fBEVP_PKEY_asn1_set_set_priv_key()\fR,
\&\fBEVP_PKEY_asn1_set_set_pub_key()\fR, \fBEVP_PKEY_asn1_set_get_priv_key()\fR and
\&\fBEVP_PKEY_asn1_set_get_pub_key()\fR set the diverse methods of the given
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object.
.PP
\&\fBEVP_PKEY_get0_asn1()\fR finds the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR associated
with the key \fBpkey\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBEVP_PKEY_asn1_new()\fR returns \s-1NULL\s0 on error, or a pointer to an
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object otherwise.
.PP
\&\fBEVP_PKEY_asn1_add0()\fR and \fBEVP_PKEY_asn1_add_alias()\fR return 0 on error,
or 1 on success.
.PP
\&\fBEVP_PKEY_get0_asn1()\fR returns \s-1NULL\s0 on error, or a pointer to a constant
\&\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR object otherwise.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 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>.

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