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Editing: EVP_PKEY_ASN1_METHOD.3
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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>.
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