444 lines
21 KiB
HTML
Executable File
444 lines
21 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>EVP_PKEY_ASN1_METHOD</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<ul>
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<li><a href="#methods">Methods</a></li>
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<li><a href="#functions">Functions</a></li>
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</ul>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>EVP_PKEY_ASN1_METHOD,
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EVP_PKEY_asn1_new,
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EVP_PKEY_asn1_copy,
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EVP_PKEY_asn1_free,
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EVP_PKEY_asn1_add0,
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EVP_PKEY_asn1_add_alias,
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EVP_PKEY_asn1_set_public,
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EVP_PKEY_asn1_set_private,
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EVP_PKEY_asn1_set_param,
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EVP_PKEY_asn1_set_free,
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EVP_PKEY_asn1_set_ctrl,
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EVP_PKEY_asn1_set_item,
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EVP_PKEY_asn1_set_siginf,
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EVP_PKEY_asn1_set_check,
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EVP_PKEY_asn1_set_public_check,
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EVP_PKEY_asn1_set_param_check,
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EVP_PKEY_asn1_set_security_bits,
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EVP_PKEY_asn1_set_set_priv_key,
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EVP_PKEY_asn1_set_set_pub_key,
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EVP_PKEY_asn1_set_get_priv_key,
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EVP_PKEY_asn1_set_get_pub_key,
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EVP_PKEY_get0_asn1
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- manipulating and registering EVP_PKEY_ASN1_METHOD structure</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/evp.h></pre>
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<pre>
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typedef struct evp_pkey_asn1_method_st EVP_PKEY_ASN1_METHOD;</pre>
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<pre>
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EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
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const char *pem_str,
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const char *info);
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void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
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const EVP_PKEY_ASN1_METHOD *src);
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void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth);
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int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth);
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int EVP_PKEY_asn1_add_alias(int to, int from);</pre>
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<pre>
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void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pub_decode) (EVP_PKEY *pk,
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X509_PUBKEY *pub),
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int (*pub_encode) (X509_PUBKEY *pub,
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const EVP_PKEY *pk),
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int (*pub_cmp) (const EVP_PKEY *a,
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const EVP_PKEY *b),
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int (*pub_print) (BIO *out,
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const EVP_PKEY *pkey,
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int indent, ASN1_PCTX *pctx),
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int (*pkey_size) (const EVP_PKEY *pk),
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int (*pkey_bits) (const EVP_PKEY *pk));
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void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
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int (*priv_decode) (EVP_PKEY *pk,
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const PKCS8_PRIV_KEY_INFO
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*p8inf),
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int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
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const EVP_PKEY *pk),
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int (*priv_print) (BIO *out,
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const EVP_PKEY *pkey,
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int indent,
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ASN1_PCTX *pctx));
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void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
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int (*param_decode) (EVP_PKEY *pkey,
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const unsigned char **pder,
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int derlen),
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int (*param_encode) (const EVP_PKEY *pkey,
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unsigned char **pder),
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int (*param_missing) (const EVP_PKEY *pk),
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int (*param_copy) (EVP_PKEY *to,
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const EVP_PKEY *from),
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int (*param_cmp) (const EVP_PKEY *a,
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const EVP_PKEY *b),
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int (*param_print) (BIO *out,
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const EVP_PKEY *pkey,
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int indent,
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ASN1_PCTX *pctx));</pre>
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<pre>
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void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
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void (*pkey_free) (EVP_PKEY *pkey));
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void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
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long arg1, void *arg2));
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void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
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int (*item_verify) (EVP_MD_CTX *ctx,
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const ASN1_ITEM *it,
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void *asn,
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X509_ALGOR *a,
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ASN1_BIT_STRING *sig,
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EVP_PKEY *pkey),
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int (*item_sign) (EVP_MD_CTX *ctx,
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const ASN1_ITEM *it,
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void *asn,
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X509_ALGOR *alg1,
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X509_ALGOR *alg2,
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ASN1_BIT_STRING *sig));</pre>
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<pre>
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void EVP_PKEY_asn1_set_siginf(EVP_PKEY_ASN1_METHOD *ameth,
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int (*siginf_set) (X509_SIG_INFO *siginf,
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const X509_ALGOR *alg,
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const ASN1_STRING *sig));</pre>
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<pre>
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void EVP_PKEY_asn1_set_check(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pkey_check) (const EVP_PKEY *pk));</pre>
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<pre>
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void EVP_PKEY_asn1_set_public_check(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pkey_pub_check) (const EVP_PKEY *pk));</pre>
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<pre>
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void EVP_PKEY_asn1_set_param_check(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pkey_param_check) (const EVP_PKEY *pk));</pre>
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<pre>
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void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
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int (*pkey_security_bits) (const EVP_PKEY
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*pk));</pre>
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<pre>
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void EVP_PKEY_asn1_set_set_priv_key(EVP_PKEY_ASN1_METHOD *ameth,
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int (*set_priv_key) (EVP_PKEY *pk,
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const unsigned char
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*priv,
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size_t len));</pre>
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<pre>
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void EVP_PKEY_asn1_set_set_pub_key(EVP_PKEY_ASN1_METHOD *ameth,
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int (*set_pub_key) (EVP_PKEY *pk,
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const unsigned char *pub,
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size_t len));</pre>
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<pre>
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void EVP_PKEY_asn1_set_get_priv_key(EVP_PKEY_ASN1_METHOD *ameth,
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int (*get_priv_key) (const EVP_PKEY *pk,
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unsigned char *priv,
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size_t *len));</pre>
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<pre>
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void EVP_PKEY_asn1_set_get_pub_key(EVP_PKEY_ASN1_METHOD *ameth,
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int (*get_pub_key) (const EVP_PKEY *pk,
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unsigned char *pub,
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size_t *len));</pre>
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<pre>
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const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(const EVP_PKEY *pkey);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p><strong>EVP_PKEY_ASN1_METHOD</strong> is a structure which holds a set of ASN.1
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conversion, printing and information methods for a specific public key
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algorithm.</p>
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<p>There are two places where the <strong>EVP_PKEY_ASN1_METHOD</strong> objects are
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stored: one is a built-in array representing the standard methods for
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different algorithms, and the other one is a stack of user-defined
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application-specific methods, which can be manipulated by using
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<em>EVP_PKEY_asn1_add0(3)</em>.</p>
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<p>
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</p>
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<h2><a name="methods">Methods</a></h2>
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<p>The methods are the underlying implementations of a particular public
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key algorithm present by the <strong>EVP_PKEY</strong> object.</p>
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<pre>
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int (*pub_decode) (EVP_PKEY *pk, X509_PUBKEY *pub);
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int (*pub_encode) (X509_PUBKEY *pub, const EVP_PKEY *pk);
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int (*pub_cmp) (const EVP_PKEY *a, const EVP_PKEY *b);
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int (*pub_print) (BIO *out, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *pctx);</pre>
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<p>The <code>pub_decode()</code> and <code>pub_encode()</code> methods are called to decode /
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encode <strong>X509_PUBKEY</strong> ASN.1 parameters to / from <strong>pk</strong>.
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They MUST return 0 on error, 1 on success.
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They're called by <em>X509_PUBKEY_get0(3)</em> and <em>X509_PUBKEY_set(3)</em>.</p>
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<p>The <code>pub_cmp()</code> method is called when two public keys are to be
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compared.
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It MUST return 1 when the keys are equal, 0 otherwise.
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It's called by <em>EVP_PKEY_cmp(3)</em>.</p>
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<p>The <code>pub_print()</code> method is called to print a public key in humanly
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readable text to <strong>out</strong>, indented <strong>indent</strong> spaces.
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It MUST return 0 on error, 1 on success.
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It's called by <em>EVP_PKEY_print_public(3)</em>.</p>
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<pre>
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int (*priv_decode) (EVP_PKEY *pk, const PKCS8_PRIV_KEY_INFO *p8inf);
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int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk);
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int (*priv_print) (BIO *out, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *pctx);</pre>
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<p>The <code>priv_decode()</code> and <code>priv_encode()</code> methods are called to decode /
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encode <strong>PKCS8_PRIV_KEY_INFO</strong> form private key to / from <strong>pk</strong>.
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They MUST return 0 on error, 1 on success.
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They're called by <em>EVP_PKCS82PKEY(3)</em> and <em>EVP_PKEY2PKCS8(3)</em>.</p>
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<p>The <code>priv_print()</code> method is called to print a private key in humanly
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readable text to <strong>out</strong>, indented <strong>indent</strong> spaces.
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It MUST return 0 on error, 1 on success.
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It's called by <em>EVP_PKEY_print_private(3)</em>.</p>
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<pre>
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int (*pkey_size) (const EVP_PKEY *pk);
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int (*pkey_bits) (const EVP_PKEY *pk);
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int (*pkey_security_bits) (const EVP_PKEY *pk);</pre>
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<p>The <code>pkey_size()</code> method returns the key size in bytes.
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It's called by <em>EVP_PKEY_size(3)</em>.</p>
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<p>The <code>pkey_bits()</code> method returns the key size in bits.
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It's called by <em>EVP_PKEY_bits(3)</em>.</p>
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<pre>
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int (*param_decode) (EVP_PKEY *pkey,
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const unsigned char **pder, int derlen);
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int (*param_encode) (const EVP_PKEY *pkey, unsigned char **pder);
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int (*param_missing) (const EVP_PKEY *pk);
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int (*param_copy) (EVP_PKEY *to, const EVP_PKEY *from);
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int (*param_cmp) (const EVP_PKEY *a, const EVP_PKEY *b);
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int (*param_print) (BIO *out, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *pctx);</pre>
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<p>The <code>param_decode()</code> and <code>param_encode()</code> methods are called to decode /
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encode DER formatted parameters to / from <strong>pk</strong>.
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They MUST return 0 on error, 1 on success.
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They're called by <em>PEM_read_bio_Parameters(3)</em> and the <strong>file:</strong>
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<em>OSSL_STORE_LOADER(3)</em>.</p>
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<p>The <code>param_missing()</code> method returns 0 if a key parameter is missing,
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otherwise 1.
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It's called by <em>EVP_PKEY_missing_parameters(3)</em>.</p>
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<p>The <code>param_copy()</code> method copies key parameters from <strong>from</strong> to <strong>to</strong>.
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It MUST return 0 on error, 1 on success.
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It's called by <em>EVP_PKEY_copy_parameters(3)</em>.</p>
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<p>The <code>param_cmp()</code> method compares the parameters of keys <strong>a</strong> and <strong>b</strong>.
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It MUST return 1 when the keys are equal, 0 when not equal, or a
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negative number on error.
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It's called by <em>EVP_PKEY_cmp_parameters(3)</em>.</p>
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<p>The <code>param_print()</code> method prints the private key parameters in humanly
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readable text to <strong>out</strong>, indented <strong>indent</strong> spaces.
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It MUST return 0 on error, 1 on success.
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It's called by <em>EVP_PKEY_print_params(3)</em>.</p>
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<pre>
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int (*sig_print) (BIO *out,
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const X509_ALGOR *sigalg, const ASN1_STRING *sig,
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int indent, ASN1_PCTX *pctx);</pre>
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<p>The <code>sig_print()</code> method prints a signature in humanly readable text to
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<strong>out</strong>, indented <strong>indent</strong> spaces.
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<strong>sigalg</strong> contains the exact signature algorithm.
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If the signature in <strong>sig</strong> doesn't correspond to what this method
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expects, X509_signature_dump() must be used as a last resort.
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It MUST return 0 on error, 1 on success.
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It's called by <em>X509_signature_print(3)</em>.</p>
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<pre>
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void (*pkey_free) (EVP_PKEY *pkey);</pre>
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<p>The <code>pkey_free()</code> method helps freeing the internals of <strong>pkey</strong>.
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It's called by <em>EVP_PKEY_free(3)</em>, <em>EVP_PKEY_set_type(3)</em>,
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<em>EVP_PKEY_set_type_str(3)</em>, and <em>EVP_PKEY_assign(3)</em>.</p>
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<pre>
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int (*pkey_ctrl) (EVP_PKEY *pkey, int op, long arg1, void *arg2);</pre>
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<p>The <code>pkey_ctrl()</code> method adds extra algorithm specific control.
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It's called by <em>EVP_PKEY_get_default_digest_nid(3)</em>,
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<em>EVP_PKEY_supports_digest_nid(3)</em>,
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<em>EVP_PKEY_set1_tls_encodedpoint(3)</em>,
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<em>EVP_PKEY_get1_tls_encodedpoint(3)</em>, <em>PKCS7_SIGNER_INFO_set(3)</em>,
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<em>PKCS7_RECIP_INFO_set(3)</em>, ...</p>
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<pre>
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int (*old_priv_decode) (EVP_PKEY *pkey,
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const unsigned char **pder, int derlen);
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int (*old_priv_encode) (const EVP_PKEY *pkey, unsigned char **pder);</pre>
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<p>The <code>old_priv_decode()</code> and <code>old_priv_encode()</code> methods decode / encode
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they private key <strong>pkey</strong> from / to a DER formatted array.
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These are exclusively used to help decoding / encoding older (pre
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PKCS#8) PEM formatted encrypted private keys.
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<code>old_priv_decode()</code> MUST return 0 on error, 1 on success.
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<code>old_priv_encode()</code> MUST the return same kind of values as
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i2d_PrivateKey().
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They're called by <em>d2i_PrivateKey(3)</em> and <em>i2d_PrivateKey(3)</em>.</p>
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<pre>
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int (*item_verify) (EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
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X509_ALGOR *a, ASN1_BIT_STRING *sig, EVP_PKEY *pkey);
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int (*item_sign) (EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
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X509_ALGOR *alg1, X509_ALGOR *alg2,
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ASN1_BIT_STRING *sig);</pre>
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<p>The <code>item_sign()</code> and <code>item_verify()</code> methods make it possible to have
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algorithm specific signatures and verification of them.</p>
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<p><code>item_sign()</code> MUST return one of:</p>
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<dl>
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<dt><strong><a name="__0" class="item"><=0</a></strong></dt>
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<dd>
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<p>error</p>
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</li>
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<li>
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<p><code>item_sign()</code> did everything, OpenSSL internals just needs to pass the
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signature length back.</p>
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</li>
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<li>
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<p><code>item_sign()</code> did nothing, OpenSSL internal standard routines are
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expected to continue with the default signature production.</p>
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</li>
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<li>
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<p><code>item_sign()</code> set the algorithm identifier <strong>algor1</strong> and <strong>algor2</strong>,
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OpenSSL internals should just sign using those algorithms.</p>
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</dd>
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</dl>
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<p><code>item_verify()</code> MUST return one of:</p>
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<dl>
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<dt><strong><a name="__02" class="item"><=0</a></strong></dt>
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<dd>
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<p>error</p>
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</li>
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<li>
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<p><code>item_sign()</code> did everything, OpenSSL internals just needs to pass the
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signature length back.</p>
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</li>
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<li>
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<p><code>item_sign()</code> did nothing, OpenSSL internal standard routines are
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expected to continue with the default signature production.</p>
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</dd>
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</dl>
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<p><code>item_verify()</code> and <code>item_sign()</code> are called by <em>ASN1_item_verify(3)</em> and
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<em>ASN1_item_sign(3)</em>, and by extension, <em>X509_verify(3)</em>,
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<em>X509_REQ_verify(3)</em>, <em>X509_sign(3)</em>, <em>X509_REQ_sign(3)</em>, ...</p>
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<pre>
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int (*siginf_set) (X509_SIG_INFO *siginf, const X509_ALGOR *alg,
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const ASN1_STRING *sig);</pre>
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<p>The <code>siginf_set()</code> method is used to set custom <strong>X509_SIG_INFO</strong>
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parameters.
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It MUST return 0 on error, or 1 on success.
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It's called as part of <em>X509_check_purpose(3)</em>, <em>X509_check_ca(3)</em>
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and <em>X509_check_issued(3)</em>.</p>
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<pre>
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int (*pkey_check) (const EVP_PKEY *pk);
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int (*pkey_public_check) (const EVP_PKEY *pk);
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int (*pkey_param_check) (const EVP_PKEY *pk);</pre>
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<p>The <code>pkey_check()</code>, <code>pkey_public_check()</code> and <code>pkey_param_check()</code> methods are used
|
|
to check the validity of <strong>pk</strong> for key-pair, public component and parameters,
|
|
respectively.
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They MUST return 0 for an invalid key, or 1 for a valid key.
|
|
They are called by <em>EVP_PKEY_check(3)</em>, <em>EVP_PKEY_public_check(3)</em> and
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<em>EVP_PKEY_param_check(3)</em> respectively.</p>
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<pre>
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int (*set_priv_key) (EVP_PKEY *pk, const unsigned char *priv, size_t len);
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int (*set_pub_key) (EVP_PKEY *pk, const unsigned char *pub, size_t len);</pre>
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<p>The <code>set_priv_key()</code> and <code>set_pub_key()</code> methods are used to set the raw private and
|
|
public key data for an EVP_PKEY. They MUST return 0 on error, or 1 on success.
|
|
They are called by <em>EVP_PKEY_new_raw_private_key(3)</em>, and
|
|
<em>EVP_PKEY_new_raw_public_key(3)</em> respectively.</p>
|
|
<pre>
|
|
size_t (*dirty) (const EVP_PKEY *pk);
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|
void *(*export_to) (const EVP_PKEY *pk, EVP_KEYMGMT *keymgmt);</pre>
|
|
<p><code>dirty_cnt()</code> returns the internal key's dirty count.
|
|
This can be used to synchronise different copies of the same keys.</p>
|
|
<p>The <code>export_to()</code> method exports the key material from the given key to
|
|
a provider, through the <em>EVP_KEYMGMT(3)</em> interface, if that provider
|
|
supports importing key material.</p>
|
|
<p>
|
|
</p>
|
|
<h2><a name="functions">Functions</a></h2>
|
|
<p>EVP_PKEY_asn1_new() creates and returns a new <strong>EVP_PKEY_ASN1_METHOD</strong>
|
|
object, and associates the given <strong>id</strong>, <strong>flags</strong>, <strong>pem_str</strong> and
|
|
<strong>info</strong>.
|
|
<strong>id</strong> is a NID, <strong>pem_str</strong> is the PEM type string, <strong>info</strong> is a
|
|
descriptive string.
|
|
The following <strong>flags</strong> are supported:</p>
|
|
<pre>
|
|
ASN1_PKEY_SIGPARAM_NULL</pre>
|
|
<p>If <strong>ASN1_PKEY_SIGPARAM_NULL</strong> is set, then the signature algorithm
|
|
parameters are given the type <strong>V_ASN1_NULL</strong> by default, otherwise
|
|
they will be given the type <strong>V_ASN1_UNDEF</strong> (i.e. the parameter is
|
|
omitted).
|
|
See <em>X509_ALGOR_set0(3)</em> for more information.</p>
|
|
<p>EVP_PKEY_asn1_copy() copies an <strong>EVP_PKEY_ASN1_METHOD</strong> object from
|
|
<strong>src</strong> to <strong>dst</strong>.
|
|
This function is not thread safe, it's recommended to only use this
|
|
when initializing the application.</p>
|
|
<p>EVP_PKEY_asn1_free() frees an existing <strong>EVP_PKEY_ASN1_METHOD</strong> pointed
|
|
by <strong>ameth</strong>.</p>
|
|
<p>EVP_PKEY_asn1_add0() adds <strong>ameth</strong> to the user defined stack of
|
|
methods unless another <strong>EVP_PKEY_ASN1_METHOD</strong> with the same NID is
|
|
already there.
|
|
This function is not thread safe, it's recommended to only use this
|
|
when initializing the application.</p>
|
|
<p>EVP_PKEY_asn1_add_alias() creates an alias with the NID <strong>to</strong> for the
|
|
<strong>EVP_PKEY_ASN1_METHOD</strong> with NID <strong>from</strong> unless another
|
|
<strong>EVP_PKEY_ASN1_METHOD</strong> with the same NID is already added.
|
|
This function is not thread safe, it's recommended to only use this
|
|
when initializing the application.</p>
|
|
<p>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() and
|
|
EVP_PKEY_asn1_set_get_pub_key() set the diverse methods of the given
|
|
<strong>EVP_PKEY_ASN1_METHOD</strong> object.</p>
|
|
<p>EVP_PKEY_get0_asn1() finds the <strong>EVP_PKEY_ASN1_METHOD</strong> associated
|
|
with the key <strong>pkey</strong>.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="return_values">RETURN VALUES</a></h1>
|
|
<p>EVP_PKEY_asn1_new() returns NULL on error, or a pointer to an
|
|
<strong>EVP_PKEY_ASN1_METHOD</strong> object otherwise.</p>
|
|
<p>EVP_PKEY_asn1_add0() and EVP_PKEY_asn1_add_alias() return 0 on error,
|
|
or 1 on success.</p>
|
|
<p>EVP_PKEY_get0_asn1() returns NULL on error, or a pointer to a constant
|
|
<strong>EVP_PKEY_ASN1_METHOD</strong> object otherwise.</p>
|
|
<p>
|
|
</p>
|
|
<hr />
|
|
<h1><a name="copyright">COPYRIGHT</a></h1>
|
|
<p>Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
|
|
<p>Licensed under the Apache License 2.0 (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
|
|
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
|
|
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</body>
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</html>
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