mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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281 lines
8.9 KiB
Plaintext
281 lines
8.9 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_fromdata_init, EVP_PKEY_fromdata, EVP_PKEY_fromdata_settable
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- functions to create keys and key parameters from user data
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_fromdata_init(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_fromdata(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey, int selection,
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OSSL_PARAM params[]);
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const OSSL_PARAM *EVP_PKEY_fromdata_settable(EVP_PKEY_CTX *ctx, int selection);
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=head1 DESCRIPTION
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The functions described here are used to create new keys from user
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provided key data, such as I<n>, I<e> and I<d> for a minimal RSA
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keypair.
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These functions use an B<EVP_PKEY_CTX> context, which should primarily
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be created with L<EVP_PKEY_CTX_new_from_name(3)> or
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L<EVP_PKEY_CTX_new_id(3)>.
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The exact key data that the user can pass depends on the key type.
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These are passed as an L<OSSL_PARAM(3)> array.
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EVP_PKEY_fromdata_init() initializes a public key algorithm context
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for creating a key or key parameters from user data.
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EVP_PKEY_fromdata() creates the structure to store a key or key parameters,
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given data from I<params>, I<selection> and a context that's been initialized
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with EVP_PKEY_fromdata_init(). The result is written to I<*ppkey>.
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I<selection> is described in L</Selections>.
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The parameters that can be used for various types of key are as described by the
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diverse "Common parameters" sections of the
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L<B<EVP_PKEY-RSA>(7)|EVP_PKEY-RSA(7)/Common RSA parameters>,
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L<B<EVP_PKEY-DSA>(7)|EVP_PKEY-DSA(7)/Common DSA & DH parameters>,
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L<B<EVP_PKEY-DH>(7)|EVP_PKEY-DH(7)/Common DH parameters>,
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L<B<EVP_PKEY-EC>(7)|EVP_PKEY-EC(7)/Common EC parameters>,
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L<B<EVP_PKEY-ED448>(7)|EVP_PKEY-ED448(7)/Common X25519, X448, ED25519 and ED448 parameters>,
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L<B<EVP_PKEY-X25519>(7)|EVP_PKEY-X25519(7)/Common X25519, X448, ED25519 and ED448 parameters>,
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L<B<EVP_PKEY-X448>(7)|EVP_PKEY-X448(7)/Common X25519, X448, ED25519 and ED448 parameters>,
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and L<B<EVP_PKEY-ED25519>(7)|EVP_PKEY-ED25519(7)/Common X25519, X448, ED25519 and ED448 parameters> pages.
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=for comment the awful list of links above is made this way so we get nice
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rendering as a man-page while still getting proper links in HTML
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EVP_PKEY_fromdata_settable() gets a constant L<OSSL_PARAM(3)> array that describes
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the settable parameters that can be used with EVP_PKEY_fromdata().
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I<selection> is described in L</Selections>.
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Parameters in the I<params> array that are not among the settable parameters
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for the given I<selection> are ignored.
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=head2 Selections
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The following constants can be used for I<selection>:
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=over 4
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=item B<EVP_PKEY_KEY_PARAMETERS>
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Only key parameters will be selected.
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=item B<EVP_PKEY_PUBLIC_KEY>
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Only public key components will be selected. This includes optional key
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parameters.
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=item B<EVP_PKEY_KEYPAIR>
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Any keypair components will be selected. This includes the private key,
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public key and key parameters.
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=back
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=head1 NOTES
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These functions only work with key management methods coming from a provider.
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This is the mirror function to L<EVP_PKEY_todata(3)>.
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=for comment We may choose to make this available for legacy methods too...
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=head1 RETURN VALUES
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EVP_PKEY_fromdata_init() and EVP_PKEY_fromdata() return 1 for success and 0 or
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a negative value for failure. In particular a return value of -2 indicates the
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operation is not supported by the public key algorithm.
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=head1 EXAMPLES
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These examples are very terse for the sake of staying on topic, which
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is the EVP_PKEY_fromdata() set of functions. In real applications,
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BIGNUMs would be handled and converted to byte arrays with
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BN_bn2nativepad(), but that's off topic here.
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=begin comment
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TODO Write a set of cookbook documents and link to them.
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=end comment
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=head2 Creating an RSA keypair using raw key data
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#include <openssl/evp.h>
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/*
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* These are extremely small to make this example simple. A real
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* and secure application will not use such small numbers. A real
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* and secure application is expected to use BIGNUMs, and to build
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* this array dynamically.
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*/
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unsigned long rsa_n = 0xbc747fc5;
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unsigned long rsa_e = 0x10001;
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unsigned long rsa_d = 0x7b133399;
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OSSL_PARAM params[] = {
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OSSL_PARAM_ulong("n", &rsa_n),
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OSSL_PARAM_ulong("e", &rsa_e),
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OSSL_PARAM_ulong("d", &rsa_d),
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OSSL_PARAM_END
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};
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int main()
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{
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EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
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EVP_PKEY *pkey = NULL;
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if (ctx == NULL
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|| EVP_PKEY_fromdata_init(ctx) <= 0
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|| EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEYPAIR, params) <= 0)
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exit(1);
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/* Do what you want with |pkey| */
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}
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=head2 Creating an ECC keypair using raw key data
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#include <openssl/evp.h>
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#include <openssl/param_build.h>
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#include <openssl/ec.h>
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/*
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* Fixed data to represent the private and public key.
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*/
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const unsigned char priv_data[] = {
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0xb9, 0x2f, 0x3c, 0xe6, 0x2f, 0xfb, 0x45, 0x68,
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0x39, 0x96, 0xf0, 0x2a, 0xaf, 0x6c, 0xda, 0xf2,
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0x89, 0x8a, 0x27, 0xbf, 0x39, 0x9b, 0x7e, 0x54,
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0x21, 0xc2, 0xa1, 0xe5, 0x36, 0x12, 0x48, 0x5d
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};
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/* UNCOMPRESSED FORMAT */
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const unsigned char pub_data[] = {
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POINT_CONVERSION_UNCOMPRESSED,
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0xcf, 0x20, 0xfb, 0x9a, 0x1d, 0x11, 0x6c, 0x5e,
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0x9f, 0xec, 0x38, 0x87, 0x6c, 0x1d, 0x2f, 0x58,
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0x47, 0xab, 0xa3, 0x9b, 0x79, 0x23, 0xe6, 0xeb,
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0x94, 0x6f, 0x97, 0xdb, 0xa3, 0x7d, 0xbd, 0xe5,
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0x26, 0xca, 0x07, 0x17, 0x8d, 0x26, 0x75, 0xff,
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0xcb, 0x8e, 0xb6, 0x84, 0xd0, 0x24, 0x02, 0x25,
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0x8f, 0xb9, 0x33, 0x6e, 0xcf, 0x12, 0x16, 0x2f,
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0x5c, 0xcd, 0x86, 0x71, 0xa8, 0xbf, 0x1a, 0x47
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};
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int main()
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{
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EVP_PKEY_CTX *ctx;
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EVP_PKEY *pkey = NULL;
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BIGNUM *priv;
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OSSL_PARAM_BLD *param_bld;
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OSSL_PARAM *params = NULL;
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int exitcode = 0;
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priv = BN_bin2bn(priv_data, sizeof(priv_data), NULL);
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param_bld = OSSL_PARAM_BLD_new();
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if (priv != NULL && param_bld != NULL
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&& OSSL_PARAM_BLD_push_utf8_string(param_bld, "group",
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"prime256v1", 0)
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&& OSSL_PARAM_BLD_push_BN(param_bld, "priv", priv)
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&& OSSL_PARAM_BLD_push_octet_string(param_bld, "pub",
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pub_data, sizeof(pub_data)))
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params = OSSL_PARAM_BLD_to_param(param_bld);
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ctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
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if (ctx == NULL
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|| params == NULL
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|| EVP_PKEY_fromdata_init(ctx) <= 0
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|| EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEYPAIR, params) <= 0) {
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exitcode = 1;
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} else {
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/* Do what you want with |pkey| */
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}
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EVP_PKEY_free(pkey);
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EVP_PKEY_CTX_free(ctx);
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OSSL_PARAM_free(params);
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OSSL_PARAM_BLD_free(param_bld);
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BN_free(priv);
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exit(exitcode);
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}
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=head2 Finding out params for an unknown key type
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#include <openssl/evp.h>
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#include <openssl/core.h>
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/* Program expects a key type as first argument */
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int main(int argc, char *argv[])
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{
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EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name(NULL, argv[1], NULL);
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const OSSL_PARAM *settable_params = NULL;
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if (ctx == NULL)
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exit(1);
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settable_params = EVP_PKEY_fromdata_settable(ctx, EVP_PKEY_KEYPAIR);
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if (settable_params == NULL)
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exit(1);
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for (; settable_params->key != NULL; settable_params++) {
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const char *datatype = NULL;
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switch (settable_params->data_type) {
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case OSSL_PARAM_INTEGER:
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datatype = "integer";
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break;
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case OSSL_PARAM_UNSIGNED_INTEGER:
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datatype = "unsigned integer";
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break;
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case OSSL_PARAM_UTF8_STRING:
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datatype = "printable string (utf-8 encoding expected)";
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break;
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case OSSL_PARAM_UTF8_PTR:
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datatype = "printable string pointer (utf-8 encoding expected)";
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break;
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case OSSL_PARAM_OCTET_STRING:
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datatype = "octet string";
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break;
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case OSSL_PARAM_OCTET_PTR:
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datatype = "octet string pointer";
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break;
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}
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printf("%s : %s ", settable_params->key, datatype);
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if (settable_params->data_size == 0)
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printf("(unlimited size)\n");
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else
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printf("(maximum size %zu)\n", settable_params->data_size);
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}
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}
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The descriptor L<OSSL_PARAM(3)> returned by
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EVP_PKEY_fromdata_settable() may also be used programmatically, for
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example with L<OSSL_PARAM_allocate_from_text(3)>.
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)>, L<provider(7)>, L<EVP_PKEY_gettable_params(3)>,
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L<OSSL_PARAM(3)>, L<EVP_PKEY_todata(3)>,
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L<EVP_PKEY-RSA(7)>, L<EVP_PKEY-DSA(7)>, L<EVP_PKEY-DH(7)>, L<EVP_PKEY-EC(7)>,
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L<EVP_PKEY-ED448(7)>, L<EVP_PKEY-X25519(7)>, L<EVP_PKEY-X448(7)>,
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L<EVP_PKEY-ED25519(7)>
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=head1 HISTORY
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These functions were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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