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oqsprov_keys.c
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// SPDX-License-Identifier: Apache-2.0 AND MIT
/*
* OQS OpenSSL 3 key handler.
*
* Code strongly inspired by OpenSSL crypto/ec key handler but relocated here
* to have code within provider.
*
*/
#include "oqs_prov.h"
#include <assert.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/params.h>
#include <openssl/x509.h>
#include <string.h>
#ifdef NDEBUG
# define OQS_KEY_PRINTF(a)
# define OQS_KEY_PRINTF2(a, b)
# define OQS_KEY_PRINTF3(a, b, c)
#else
# define OQS_KEY_PRINTF(a) \
if (getenv("OQSKEY")) \
printf(a)
# define OQS_KEY_PRINTF2(a, b) \
if (getenv("OQSKEY")) \
printf(a, b)
# define OQS_KEY_PRINTF3(a, b, c) \
if (getenv("OQSKEY")) \
printf(a, b, c)
#endif // NDEBUG
typedef enum {
KEY_OP_PUBLIC,
KEY_OP_PRIVATE,
KEY_OP_KEYGEN
} oqsx_key_op_t;
/// NID/name table
typedef struct {
int nid;
char *tlsname;
char *oqsname;
int keytype;
int secbits;
} oqs_nid_name_t;
static int oqsx_key_recreate_classickey(OQSX_KEY *key, oqsx_key_op_t op);
///// OQS_TEMPLATE_FRAGMENT_OQSNAMES_START
#define NID_TABLE_LEN 23
static oqs_nid_name_t nid_names[NID_TABLE_LEN] = {
{0, "dilithium2", OQS_SIG_alg_dilithium_2, KEY_TYPE_SIG, 128},
{0, "p256_dilithium2", OQS_SIG_alg_dilithium_2, KEY_TYPE_HYB_SIG, 128},
{0, "rsa3072_dilithium2", OQS_SIG_alg_dilithium_2, KEY_TYPE_HYB_SIG, 128},
{0, "dilithium3", OQS_SIG_alg_dilithium_3, KEY_TYPE_SIG, 192},
{0, "p384_dilithium3", OQS_SIG_alg_dilithium_3, KEY_TYPE_HYB_SIG, 192},
{0, "dilithium5", OQS_SIG_alg_dilithium_5, KEY_TYPE_SIG, 256},
{0, "p521_dilithium5", OQS_SIG_alg_dilithium_5, KEY_TYPE_HYB_SIG, 256},
{0, "falcon512", OQS_SIG_alg_falcon_512, KEY_TYPE_SIG, 128},
{0, "p256_falcon512", OQS_SIG_alg_falcon_512, KEY_TYPE_HYB_SIG, 128},
{0, "rsa3072_falcon512", OQS_SIG_alg_falcon_512, KEY_TYPE_HYB_SIG, 128},
{0, "falcon1024", OQS_SIG_alg_falcon_1024, KEY_TYPE_SIG, 256},
{0, "p521_falcon1024", OQS_SIG_alg_falcon_1024, KEY_TYPE_HYB_SIG, 256},
{0, "sphincssha2128fsimple", OQS_SIG_alg_sphincs_sha2_128f_simple,
KEY_TYPE_SIG, 128},
{0, "p256_sphincssha2128fsimple", OQS_SIG_alg_sphincs_sha2_128f_simple,
KEY_TYPE_HYB_SIG, 128},
{0, "rsa3072_sphincssha2128fsimple", OQS_SIG_alg_sphincs_sha2_128f_simple,
KEY_TYPE_HYB_SIG, 128},
{0, "sphincssha2128ssimple", OQS_SIG_alg_sphincs_sha2_128s_simple,
KEY_TYPE_SIG, 128},
{0, "p256_sphincssha2128ssimple", OQS_SIG_alg_sphincs_sha2_128s_simple,
KEY_TYPE_HYB_SIG, 128},
{0, "rsa3072_sphincssha2128ssimple", OQS_SIG_alg_sphincs_sha2_128s_simple,
KEY_TYPE_HYB_SIG, 128},
{0, "sphincssha2192fsimple", OQS_SIG_alg_sphincs_sha2_192f_simple,
KEY_TYPE_SIG, 192},
{0, "p384_sphincssha2192fsimple", OQS_SIG_alg_sphincs_sha2_192f_simple,
KEY_TYPE_HYB_SIG, 192},
{0, "sphincsshake128fsimple", OQS_SIG_alg_sphincs_shake_128f_simple,
KEY_TYPE_SIG, 128},
{0, "p256_sphincsshake128fsimple", OQS_SIG_alg_sphincs_shake_128f_simple,
KEY_TYPE_HYB_SIG, 128},
{0, "rsa3072_sphincsshake128fsimple", OQS_SIG_alg_sphincs_shake_128f_simple,
KEY_TYPE_HYB_SIG, 128},
///// OQS_TEMPLATE_FRAGMENT_OQSNAMES_END
};
int oqs_set_nid(char *tlsname, int nid)
{
int i;
for (i = 0; i < NID_TABLE_LEN; i++) {
if (!strcmp(nid_names[i].tlsname, tlsname)) {
nid_names[i].nid = nid;
return 1;
}
}
return 0;
}
static int get_secbits(int nid)
{
int i;
for (i = 0; i < NID_TABLE_LEN; i++) {
if (nid_names[i].nid == nid)
return nid_names[i].secbits;
}
return 0;
}
static int get_keytype(int nid)
{
int i;
for (i = 0; i < NID_TABLE_LEN; i++) {
if (nid_names[i].nid == nid)
return nid_names[i].keytype;
}
return 0;
}
static char *get_oqsname(int nid)
{
int i;
for (i = 0; i < NID_TABLE_LEN; i++) {
if (nid_names[i].nid == nid)
return nid_names[i].oqsname;
}
return 0;
}
static int get_oqsalg_idx(int nid)
{
int i;
for (i = 0; i < NID_TABLE_LEN; i++) {
if (nid_names[i].nid == nid)
return i;
}
return -1;
}
/* Prepare composite data structures. RetVal 0 is error. */
static int oqsx_key_set_composites(OQSX_KEY *key)
{
int ret = 1;
OQS_KEY_PRINTF2("Setting composites with evp_info %p\n", key->evp_info);
if (key->numkeys == 1) {
key->comp_privkey[0] = key->privkey;
key->comp_pubkey[0] = key->pubkey;
} else { // TBD: extend for more than 1 classic key:
int classic_pubkey_len, classic_privkey_len;
if (key->privkey) {
key->comp_privkey[0] = (char *)key->privkey + SIZE_OF_UINT32;
DECODE_UINT32(classic_privkey_len, key->privkey);
key->comp_privkey[1]
= (char *)key->privkey + classic_privkey_len + SIZE_OF_UINT32;
} else {
key->comp_privkey[0] = NULL;
key->comp_privkey[1] = NULL;
}
if (key->pubkey) {
key->comp_pubkey[0] = (char *)key->pubkey + SIZE_OF_UINT32;
DECODE_UINT32(classic_pubkey_len, key->pubkey);
key->comp_pubkey[1]
= (char *)key->pubkey + classic_pubkey_len + SIZE_OF_UINT32;
} else {
key->comp_pubkey[0] = NULL;
key->comp_pubkey[1] = NULL;
}
}
return ret;
}
PROV_OQS_CTX *oqsx_newprovctx(OSSL_LIB_CTX *libctx,
const OSSL_CORE_HANDLE *handle, BIO_METHOD *bm)
{
PROV_OQS_CTX *ret = OPENSSL_zalloc(sizeof(PROV_OQS_CTX));
if (ret) {
ret->libctx = libctx;
ret->handle = handle;
ret->corebiometh = bm;
}
return ret;
}
void oqsx_freeprovctx(PROV_OQS_CTX *ctx)
{
OSSL_LIB_CTX_free(ctx->libctx);
BIO_meth_free(ctx->corebiometh);
OPENSSL_free(ctx);
}
void oqsx_key_set0_libctx(OQSX_KEY *key, OSSL_LIB_CTX *libctx)
{
key->libctx = libctx;
}
/* convenience function creating OQSX keys from nids (only for sigs) */
static OQSX_KEY *oqsx_key_new_from_nid(OSSL_LIB_CTX *libctx, const char *propq,
int nid)
{
OQS_KEY_PRINTF2("Generating OQSX key for nid %d\n", nid);
char *tls_algname = (char *)OBJ_nid2sn(nid);
OQS_KEY_PRINTF2(" for tls_name %s\n", tls_algname);
if (!tls_algname) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_WRONG_PARAMETERS);
return NULL;
}
return oqsx_key_new(libctx, get_oqsname(nid), tls_algname, get_keytype(nid),
propq, get_secbits(nid), get_oqsalg_idx(nid));
}
/* Workaround for not functioning EC PARAM initialization
* TBD, check https://github.com/openssl/openssl/issues/16989
*/
EVP_PKEY *setECParams(EVP_PKEY *eck, int nid)
{
const unsigned char p256params[]
= {0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07};
const unsigned char p384params[]
= {0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22};
const unsigned char p521params[]
= {0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x23};
const unsigned char *params;
switch (nid) {
case NID_X9_62_prime256v1:
params = p256params;
return d2i_KeyParams(EVP_PKEY_EC, &eck, ¶ms, sizeof(p256params));
case NID_secp384r1:
params = p384params;
return d2i_KeyParams(EVP_PKEY_EC, &eck, ¶ms, sizeof(p384params));
case NID_secp521r1:
params = p521params;
return d2i_KeyParams(EVP_PKEY_EC, &eck, ¶ms, sizeof(p521params));
default:
return NULL;
}
}
/* Re-create OQSX_KEY from encoding(s): Same end-state as after ken-gen */
static OQSX_KEY *oqsx_key_op(const X509_ALGOR *palg, const unsigned char *p,
int plen, oqsx_key_op_t op, OSSL_LIB_CTX *libctx,
const char *propq)
{
OQSX_KEY *key = NULL;
void **privkey, **pubkey;
int nid = NID_undef;
int ret = 0;
OQS_KEY_PRINTF2("OQSX KEY: key_op called with data of len %d\n", plen);
if (palg != NULL) {
int ptype;
/* Algorithm parameters must be absent */
X509_ALGOR_get0(NULL, &ptype, NULL, palg);
if (ptype != V_ASN1_UNDEF || !palg || !palg->algorithm) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
return 0;
}
nid = OBJ_obj2nid(palg->algorithm);
}
if (p == NULL || nid == EVP_PKEY_NONE || nid == NID_undef) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
return 0;
}
key = oqsx_key_new_from_nid(libctx, propq, nid);
if (key == NULL) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
return 0;
}
if (op == KEY_OP_PUBLIC) {
#ifdef USE_ENCODING_LIB
if (key->oqsx_encoding_ctx.encoding_ctx
&& key->oqsx_encoding_ctx.encoding_impl) {
key->pubkeylen = key->oqsx_encoding_ctx.encoding_ctx
->raw_crypto_publickeybytes;
if (key->oqsx_encoding_ctx.encoding_impl->crypto_publickeybytes
!= plen) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
if (oqsx_key_allocate_keymaterial(key, 0)) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
goto err;
}
if (qsc_decode(key->oqsx_encoding_ctx.encoding_ctx,
key->oqsx_encoding_ctx.encoding_impl, p,
(unsigned char **)&key->pubkey, 0, 0, 1)
!= QSC_ENC_OK) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
} else {
#endif
if (key->pubkeylen != plen) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
if (oqsx_key_allocate_keymaterial(key, 0)) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(key->pubkey, p, plen);
#ifdef USE_ENCODING_LIB
}
#endif
} else {
int classical_privatekey_len = 0;
// for plain OQS keys, we expect OQS priv||OQS pub key
size_t actualprivkeylen = key->privkeylen;
// for hybrid keys, we expect classic priv key||OQS priv key||OQS pub
// key classic pub key must/can be re-created from classic private key
if (key->numkeys == 2) {
DECODE_UINT32(classical_privatekey_len,
p); // actual classic key len
// adjust expected size
if (classical_privatekey_len > key->evp_info->length_private_key) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
actualprivkeylen -= (key->evp_info->length_private_key
- classical_privatekey_len);
}
#ifdef USE_ENCODING_LIB
if (key->oqsx_encoding_ctx.encoding_ctx
&& key->oqsx_encoding_ctx.encoding_impl) {
const qsc_encoding_t *encoding_ctx
= key->oqsx_encoding_ctx.encoding_ctx;
# ifdef NOPUBKEY_IN_PRIVKEY
// if the raw private key includes the public key, the optional part
// is needed, otherwise not.
int withoptional
= (encoding_ctx->raw_private_key_encodes_public_key ? 1 : 0);
# else
int withoptional = 1;
# endif
int pubkey_available = withoptional;
if (oqsx_key_allocate_keymaterial(key, 1)) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
goto err;
}
if (pubkey_available) {
if (oqsx_key_allocate_keymaterial(key, 0)) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (qsc_decode(
encoding_ctx, key->oqsx_encoding_ctx.encoding_impl, 0,
(pubkey_available ? (unsigned char **)&key->pubkey : 0), p,
(unsigned char **)&key->privkey, withoptional)
!= QSC_ENC_OK) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
} else {
#endif
#ifdef NOPUBKEY_IN_PRIVKEY
if (actualprivkeylen != plen) {
OQS_KEY_PRINTF3(
"OQSX KEY: private key with unexpected length %d vs %d\n",
plen, (int)(actualprivkeylen));
#else
if (actualprivkeylen + oqsx_key_get_oqs_public_key_len(key) != plen) {
OQS_KEY_PRINTF3(
"OQSX KEY: private key with unexpected length %d vs %d\n", plen,
(int)(actualprivkeylen + oqsx_key_get_oqs_public_key_len(key)));
#endif
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
if (oqsx_key_allocate_keymaterial(key, 1)
#ifndef NOPUBKEY_IN_PRIVKEY
|| oqsx_key_allocate_keymaterial(key, 0)
#endif
) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
goto err;
}
// first populate private key data
memcpy(key->privkey, p, actualprivkeylen);
#ifndef NOPUBKEY_IN_PRIVKEY
// only enough data to fill public OQS key component
if (oqsx_key_get_oqs_public_key_len(key)
!= plen - actualprivkeylen) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto err;
}
// populate OQS public key structure
if (key->numkeys == 2) {
unsigned char *pubkey = (unsigned char *)key->pubkey;
ENCODE_UINT32(pubkey, key->evp_info->length_public_key);
memcpy(pubkey + SIZE_OF_UINT32
+ key->evp_info->length_public_key,
p + actualprivkeylen, plen - actualprivkeylen);
} else
memcpy(key->pubkey, p + key->privkeylen,
plen - key->privkeylen);
#endif
}
#ifdef USE_ENCODING_LIB
}
#endif
if (!oqsx_key_set_composites(key) || !oqsx_key_recreate_classickey(key, op))
goto err;
return key;
err:
oqsx_key_free(key);
return NULL;
}
/* Recreate EVP data structure after import. RetVal 0 is error. */
static int oqsx_key_recreate_classickey(OQSX_KEY *key, oqsx_key_op_t op)
{
if (key->numkeys == 2) { // hybrid key
int classical_pubkey_len, classical_privkey_len;
if (!key->evp_info) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_EVPINFO_MISSING);
goto rec_err;
}
if (op == KEY_OP_PUBLIC) {
DECODE_UINT32(classical_pubkey_len, key->pubkey);
if (key->evp_info->raw_key_support) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto rec_err;
} else {
const unsigned char *enc_pubkey = key->comp_pubkey[0];
EVP_PKEY *npk = EVP_PKEY_new();
if (key->evp_info->keytype != EVP_PKEY_RSA) {
npk = setECParams(npk, key->evp_info->nid);
}
key->classical_pkey
= d2i_PublicKey(key->evp_info->keytype, &npk, &enc_pubkey,
classical_pubkey_len);
if (!key->classical_pkey) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
EVP_PKEY_free(npk);
goto rec_err;
}
}
}
if (op == KEY_OP_PRIVATE) {
DECODE_UINT32(classical_privkey_len, key->privkey);
if (key->evp_info->raw_key_support) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto rec_err;
} else {
const unsigned char *enc_privkey = key->comp_privkey[0];
unsigned char *enc_pubkey = key->comp_pubkey[0];
key->classical_pkey
= d2i_PrivateKey(key->evp_info->keytype, NULL, &enc_privkey,
classical_privkey_len);
if (!key->classical_pkey) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto rec_err;
}
#ifndef NOPUBKEY_IN_PRIVKEY
// re-create classic public key part from private key:
int pubkeylen = i2d_PublicKey(key->classical_pkey, &enc_pubkey);
if (pubkeylen != key->evp_info->length_public_key) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
goto rec_err;
}
#endif
}
}
}
return 1;
rec_err:
return 0;
}
OQSX_KEY *oqsx_key_from_x509pubkey(const X509_PUBKEY *xpk, OSSL_LIB_CTX *libctx,
const char *propq)
{
const unsigned char *p;
int plen;
X509_ALGOR *palg;
OQSX_KEY *oqsx = NULL;
if (!xpk || (!X509_PUBKEY_get0_param(NULL, &p, &plen, &palg, xpk))) {
return NULL;
}
oqsx = oqsx_key_op(palg, p, plen, KEY_OP_PUBLIC, libctx, propq);
return oqsx;
}
OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
OSSL_LIB_CTX *libctx, const char *propq)
{
OQSX_KEY *oqsx = NULL;
const unsigned char *p;
int plen;
ASN1_OCTET_STRING *oct = NULL;
const X509_ALGOR *palg;
if (!PKCS8_pkey_get0(NULL, &p, &plen, &palg, p8inf))
return 0;
oct = d2i_ASN1_OCTET_STRING(NULL, &p, plen);
if (oct == NULL) {
p = NULL;
plen = 0;
} else {
p = ASN1_STRING_get0_data(oct);
plen = ASN1_STRING_length(oct);
}
oqsx = oqsx_key_op(palg, p, plen, KEY_OP_PRIVATE, libctx, propq);
ASN1_OCTET_STRING_free(oct);
return oqsx;
}
/* Key codes */
static const OQSX_EVP_INFO nids_sig[] = {
{EVP_PKEY_EC, NID_X9_62_prime256v1, 0, 65, 121, 32, 72}, // 128 bit
{EVP_PKEY_EC, NID_secp384r1, 0, 97, 167, 48, 104}, // 192 bit
{EVP_PKEY_EC, NID_secp521r1, 0, 133, 223, 66, 141}, // 256 bit
{EVP_PKEY_RSA, NID_rsaEncryption, 0, 398, 1770, 0, 384}, // 128 bit
};
// These two array need to stay synced:
static const char *OQSX_ECP_NAMES[] = {"p256", "p384", "p521", 0};
static const OQSX_EVP_INFO nids_ecp[] = {
{EVP_PKEY_EC, NID_X9_62_prime256v1, 0, 65, 121, 32, 0}, // 128 bit
{EVP_PKEY_EC, NID_secp384r1, 0, 97, 167, 48, 0}, // 192 bit
{EVP_PKEY_EC, NID_secp521r1, 0, 133, 223, 66, 0} // 256 bit
};
// These two array need to stay synced:
static const char *OQSX_ECX_NAMES[] = {"x25519", "x448", 0};
static const OQSX_EVP_INFO nids_ecx[] = {
{EVP_PKEY_X25519, 0, 1, 32, 32, 32, 0}, // 128 bit
{EVP_PKEY_X448, 0, 1, 56, 56, 56, 0}, // 192 bit
{0, 0, 0, 0, 0, 0, 0} // 256 bit
};
static int oqsx_hybsig_init(int bit_security, OQSX_EVP_CTX *evp_ctx,
char *algname)
{
int ret = 1;
int idx = (bit_security - 128) / 64;
ON_ERR_GOTO(idx < 0 || idx > 2, err);
if (!strncmp(algname, "rsa3072_", 8))
idx += 3;
else if (algname[0] != 'p') {
OQS_KEY_PRINTF2("OQS KEY: Incorrect hybrid name: %s\n", algname);
ret = 0;
goto err;
}
ON_ERR_GOTO(idx < 0 || idx > 3, err);
evp_ctx->evp_info = &nids_sig[idx];
evp_ctx->ctx = EVP_PKEY_CTX_new_id(evp_ctx->evp_info->keytype, NULL);
ON_ERR_GOTO(!evp_ctx->ctx, err);
if (idx < 3) { // EC
ret = EVP_PKEY_paramgen_init(evp_ctx->ctx);
ON_ERR_GOTO(ret <= 0, err);
ret = EVP_PKEY_CTX_set_ec_paramgen_curve_nid(evp_ctx->ctx,
evp_ctx->evp_info->nid);
ON_ERR_GOTO(ret <= 0, err);
ret = EVP_PKEY_paramgen(evp_ctx->ctx, &evp_ctx->keyParam);
ON_ERR_GOTO(ret <= 0 || !evp_ctx->keyParam, err);
}
// RSA bit length set only during keygen
err:
return ret;
}
static const int oqshybkem_init_ecp(char *tls_name, OQSX_EVP_CTX *evp_ctx)
{
int ret = 1;
int idx = 0;
while (idx < sizeof(OQSX_ECP_NAMES)) {
if (!strncmp(tls_name, OQSX_ECP_NAMES[idx], 4))
break;
idx++;
}
ON_ERR_GOTO(idx < 0 || idx > 2, err);
evp_ctx->evp_info = &nids_ecp[idx];
evp_ctx->ctx = EVP_PKEY_CTX_new_id(evp_ctx->evp_info->keytype, NULL);
ON_ERR_GOTO(!evp_ctx->ctx, err);
ret = EVP_PKEY_paramgen_init(evp_ctx->ctx);
ON_ERR_GOTO(ret <= 0, err);
ret = EVP_PKEY_CTX_set_ec_paramgen_curve_nid(evp_ctx->ctx,
evp_ctx->evp_info->nid);
ON_ERR_GOTO(ret <= 0, err);
ret = EVP_PKEY_paramgen(evp_ctx->ctx, &evp_ctx->keyParam);
ON_ERR_GOTO(ret <= 0 || !evp_ctx->keyParam, err);
err:
return ret;
}
static const int oqshybkem_init_ecx(char *tls_name, OQSX_EVP_CTX *evp_ctx)
{
int ret = 1;
int idx = 0;
while (idx < sizeof(OQSX_ECX_NAMES)) {
if (!strncmp(tls_name, OQSX_ECX_NAMES[idx], 4))
break;
idx++;
}
ON_ERR_GOTO(idx < 0 || idx > 2, err);
evp_ctx->evp_info = &nids_ecx[idx];
evp_ctx->keyParam = EVP_PKEY_new();
ON_ERR_SET_GOTO(!evp_ctx->keyParam, ret, -1, err);
ret = EVP_PKEY_set_type(evp_ctx->keyParam, evp_ctx->evp_info->keytype);
ON_ERR_SET_GOTO(ret <= 0, ret, -1, err);
evp_ctx->ctx = EVP_PKEY_CTX_new(evp_ctx->keyParam, NULL);
ON_ERR_SET_GOTO(!evp_ctx->ctx, ret, -1, err);
err:
return ret;
}
static const int (*init_kex_fun[])(char *, OQSX_EVP_CTX *)
= {oqshybkem_init_ecp, oqshybkem_init_ecx};
#ifdef USE_ENCODING_LIB
extern const char *oqs_alg_encoding_list[];
#endif
extern const char *oqs_oid_alg_list[];
OQSX_KEY *oqsx_key_new(OSSL_LIB_CTX *libctx, char *oqs_name, char *tls_name,
int primitive, const char *propq, int bit_security,
int alg_idx)
{
OQSX_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
OQSX_EVP_CTX *evp_ctx = NULL;
int ret2 = 0;
if (ret == NULL)
goto err;
#ifdef OQS_PROVIDER_NOATOMIC
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
OPENSSL_free(ret);
goto err;
}
#endif
if (oqs_name == NULL) {
OQS_KEY_PRINTF("OQSX_KEY: Fatal error: No OQS key name provided:\n");
goto err;
}
if (tls_name == NULL) {
OQS_KEY_PRINTF("OQSX_KEY: Fatal error: No TLS key name provided:\n");
goto err;
}
switch (primitive) {
case KEY_TYPE_SIG:
ret->numkeys = 1;
ret->comp_privkey = OPENSSL_malloc(sizeof(void *));
ret->comp_pubkey = OPENSSL_malloc(sizeof(void *));
ret->oqsx_provider_ctx.oqsx_qs_ctx.sig = OQS_SIG_new(oqs_name);
if (!ret->oqsx_provider_ctx.oqsx_qs_ctx.sig) {
fprintf(
stderr,
"Could not create OQS signature algorithm %s. Enabled in liboqs?\n",
oqs_name);
goto err;
}
#ifdef USE_ENCODING_LIB
if (alg_idx >= 0 && oqs_alg_encoding_list[2 * alg_idx] != NULL
&& oqs_alg_encoding_list[2 * alg_idx + 1] != NULL) {
if (qsc_encoding_by_name_oid(&ret->oqsx_encoding_ctx.encoding_ctx,
&ret->oqsx_encoding_ctx.encoding_impl,
oqs_alg_encoding_list[2 * alg_idx + 1],
oqs_alg_encoding_list[2 * alg_idx])
!= QSC_ENC_OK) {
fprintf(
stderr,
"Could not create OQS signature encoding algorithm %s (%s, %s).\n",
oqs_alg_encoding_list[2 * alg_idx + 1], oqs_name,
oqs_alg_encoding_list[2 * alg_idx]);
ret->oqsx_encoding_ctx.encoding_ctx = NULL;
ret->oqsx_encoding_ctx.encoding_impl = NULL;
goto err;
}
}
#endif
ret->privkeylen
= ret->oqsx_provider_ctx.oqsx_qs_ctx.sig->length_secret_key;
ret->pubkeylen
= ret->oqsx_provider_ctx.oqsx_qs_ctx.sig->length_public_key;
ret->keytype = KEY_TYPE_SIG;
break;
case KEY_TYPE_KEM:
ret->numkeys = 1;
ret->comp_privkey = OPENSSL_malloc(sizeof(void *));
ret->comp_pubkey = OPENSSL_malloc(sizeof(void *));
ret->oqsx_provider_ctx.oqsx_qs_ctx.kem = OQS_KEM_new(oqs_name);
if (!ret->oqsx_provider_ctx.oqsx_qs_ctx.kem) {
fprintf(
stderr,
"Could not create OQS KEM algorithm %s. Enabled in liboqs?\n",
oqs_name);
goto err;
}
ret->privkeylen
= ret->oqsx_provider_ctx.oqsx_qs_ctx.kem->length_secret_key;
ret->pubkeylen
= ret->oqsx_provider_ctx.oqsx_qs_ctx.kem->length_public_key;
ret->keytype = KEY_TYPE_KEM;
break;
case KEY_TYPE_ECX_HYB_KEM:
case KEY_TYPE_ECP_HYB_KEM:
ret->oqsx_provider_ctx.oqsx_qs_ctx.kem = OQS_KEM_new(oqs_name);
if (!ret->oqsx_provider_ctx.oqsx_qs_ctx.kem) {
fprintf(
stderr,
"Could not create OQS KEM algorithm %s. Enabled in liboqs?\n",
oqs_name);
goto err;
}
evp_ctx = OPENSSL_zalloc(sizeof(OQSX_EVP_CTX));
ON_ERR_GOTO(!evp_ctx, err);
ret2 = (init_kex_fun[primitive - KEY_TYPE_ECP_HYB_KEM])(tls_name,
evp_ctx);
ON_ERR_GOTO(ret2 <= 0 || !evp_ctx->keyParam || !evp_ctx->ctx, err);
ret->numkeys = 2;
ret->comp_privkey = OPENSSL_malloc(ret->numkeys * sizeof(void *));
ret->comp_pubkey = OPENSSL_malloc(ret->numkeys * sizeof(void *));
ret->privkeylen
= (ret->numkeys - 1) * SIZE_OF_UINT32
+ ret->oqsx_provider_ctx.oqsx_qs_ctx.kem->length_secret_key
+ evp_ctx->evp_info->length_private_key;
ret->pubkeylen
= (ret->numkeys - 1) * SIZE_OF_UINT32
+ ret->oqsx_provider_ctx.oqsx_qs_ctx.kem->length_public_key
+ evp_ctx->evp_info->length_public_key;
ret->oqsx_provider_ctx.oqsx_evp_ctx = evp_ctx;
ret->keytype = primitive;
break;
case KEY_TYPE_HYB_SIG:
ret->oqsx_provider_ctx.oqsx_qs_ctx.sig = OQS_SIG_new(oqs_name);
if (!ret->oqsx_provider_ctx.oqsx_qs_ctx.sig) {
fprintf(
stderr,
"Could not create OQS signature algorithm %s. Enabled in liboqs?\n",
oqs_name);
goto err;
}
evp_ctx = OPENSSL_zalloc(sizeof(OQSX_EVP_CTX));
ON_ERR_GOTO(!evp_ctx, err);
ret2 = oqsx_hybsig_init(bit_security, evp_ctx, tls_name);
ON_ERR_GOTO(ret2 <= 0 || !evp_ctx->ctx, err);
ret->numkeys = 2;
ret->comp_privkey = OPENSSL_malloc(ret->numkeys * sizeof(void *));
ret->comp_pubkey = OPENSSL_malloc(ret->numkeys * sizeof(void *));
ret->privkeylen
= (ret->numkeys - 1) * SIZE_OF_UINT32
+ ret->oqsx_provider_ctx.oqsx_qs_ctx.sig->length_secret_key
+ evp_ctx->evp_info->length_private_key;
ret->pubkeylen
= (ret->numkeys - 1) * SIZE_OF_UINT32
+ ret->oqsx_provider_ctx.oqsx_qs_ctx.sig->length_public_key
+ evp_ctx->evp_info->length_public_key;
ret->oqsx_provider_ctx.oqsx_evp_ctx = evp_ctx;
ret->keytype = primitive;
ret->evp_info = evp_ctx->evp_info;
break;
default:
OQS_KEY_PRINTF2("OQSX_KEY: Unknown key type encountered: %d\n",
primitive);
goto err;
}
ret->libctx = libctx;
ret->references = 1;
ret->tls_name = OPENSSL_strdup(tls_name);
ret->bit_security = bit_security;
if (propq != NULL) {
ret->propq = OPENSSL_strdup(propq);
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
if (ret->propq == NULL)
goto err;
}
OQS_KEY_PRINTF2("OQSX_KEY: new key created: %p\n", ret);
return ret;
err:
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
void oqsx_key_free(OQSX_KEY *key)
{
int refcnt;
if (key == NULL)
return;
#ifndef OQS_PROVIDER_NOATOMIC
refcnt
= atomic_fetch_sub_explicit(&key->references, 1, memory_order_relaxed)
- 1;
if (refcnt == 0)
atomic_thread_fence(memory_order_acquire);
#else
CRYPTO_atomic_add(&key->references, -1, &refcnt, key->lock);
#endif
OQS_KEY_PRINTF3("%p:%4d:OQSX_KEY\n", (void *)key, refcnt);
if (refcnt > 0)
return;
#ifndef NDEBUG
assert(refcnt == 0);
#endif
OPENSSL_free(key->propq);
OPENSSL_free(key->tls_name);
OPENSSL_secure_clear_free(key->privkey, key->privkeylen);
OPENSSL_secure_clear_free(key->pubkey, key->pubkeylen);
OPENSSL_free(key->comp_pubkey);
OPENSSL_free(key->comp_privkey);
if (key->keytype == KEY_TYPE_KEM)
OQS_KEM_free(key->oqsx_provider_ctx.oqsx_qs_ctx.kem);
else if (key->keytype == KEY_TYPE_ECP_HYB_KEM
|| key->keytype == KEY_TYPE_ECX_HYB_KEM) {
OQS_KEM_free(key->oqsx_provider_ctx.oqsx_qs_ctx.kem);
EVP_PKEY_CTX_free(key->oqsx_provider_ctx.oqsx_evp_ctx->ctx);
EVP_PKEY_free(key->oqsx_provider_ctx.oqsx_evp_ctx->keyParam);
OPENSSL_free(key->oqsx_provider_ctx.oqsx_evp_ctx);
} else
OQS_SIG_free(key->oqsx_provider_ctx.oqsx_qs_ctx.sig);
OPENSSL_free(key->classical_pkey);
#ifdef OQS_PROVIDER_NOATOMIC
CRYPTO_THREAD_lock_free(key->lock);
#endif
OPENSSL_free(key);
}
int oqsx_key_up_ref(OQSX_KEY *key)
{
int refcnt;
#ifndef OQS_PROVIDER_NOATOMIC
refcnt
= atomic_fetch_add_explicit(&key->references, 1, memory_order_relaxed)
+ 1;
#else
CRYPTO_atomic_add(&key->references, 1, &refcnt, key->lock);
#endif
OQS_KEY_PRINTF3("%p:%4d:OQSX_KEY\n", (void *)key, refcnt);
#ifndef NDEBUG
assert(refcnt > 1);
#endif
return (refcnt > 1);
}
int oqsx_key_allocate_keymaterial(OQSX_KEY *key, int include_private)
{
int ret = 0;
if (!key->privkey && include_private) {
key->privkey = OPENSSL_secure_zalloc(key->privkeylen);
ON_ERR_SET_GOTO(!key->privkey, ret, 1, err);
}
if (!key->pubkey && !include_private) {
key->pubkey = OPENSSL_secure_zalloc(key->pubkeylen);
ON_ERR_SET_GOTO(!key->pubkey, ret, 1, err);
}
err:
return ret;
}
int oqsx_key_fromdata(OQSX_KEY *key, const OSSL_PARAM params[],
int include_private)
{
const OSSL_PARAM *p;
OQS_KEY_PRINTF("OQSX Key from data called\n");
p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
if (p != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
return 0;
}
if (key->privkeylen != p->data_size) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_SIZE);
return 0;
}
OPENSSL_secure_clear_free(key->privkey, p->data_size);
key->privkey = OPENSSL_secure_malloc(p->data_size);
if (key->privkey == NULL) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(key->privkey, p->data, p->data_size);
}
p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
if (p != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING) {
OQS_KEY_PRINTF("invalid data type\n");
return 0;
}
if (key->pubkeylen != p->data_size) {
ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_SIZE);
return 0;
}
OPENSSL_secure_clear_free(key->pubkey, p->data_size);
key->pubkey = OPENSSL_secure_malloc(p->data_size);
if (key->pubkey == NULL) {
ERR_raise(ERR_LIB_USER, ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(key->pubkey, p->data, p->data_size);
}
if (!oqsx_key_set_composites(key)
|| !oqsx_key_recreate_classickey(
key, key->privkey != NULL ? KEY_OP_PRIVATE : KEY_OP_PUBLIC))
return 0;
return 1;
}
// OQS key always the last of the numkeys comp keys
static int oqsx_key_gen_oqs(OQSX_KEY *key, int gen_kem)
{
if (gen_kem)
return OQS_KEM_keypair(key->oqsx_provider_ctx.oqsx_qs_ctx.kem,
key->comp_pubkey[key->numkeys - 1],
key->comp_privkey[key->numkeys - 1]);
else
return OQS_SIG_keypair(key->oqsx_provider_ctx.oqsx_qs_ctx.sig,
key->comp_pubkey[key->numkeys - 1],
key->comp_privkey[key->numkeys - 1]);
}
/* Generate classic keys, store length in leading SIZE_OF_UINT32 bytes of
* pubkey/privkey buffers; returned EVP_PKEY must be freed if not used
*/
static EVP_PKEY *oqsx_key_gen_evp_key(OQSX_EVP_CTX *ctx, unsigned char *pubkey,
unsigned char *privkey)
{
int ret = 0, ret2 = 0;
// Free at errhyb:
EVP_PKEY_CTX *kgctx = NULL;
EVP_PKEY *pkey = NULL;
unsigned char *pubkey_encoded = NULL;
size_t pubkeylen = 0, privkeylen = 0;
if (ctx->keyParam)
kgctx = EVP_PKEY_CTX_new(ctx->keyParam, NULL);
else
kgctx = EVP_PKEY_CTX_new_id(ctx->evp_info->nid, NULL);
ON_ERR_SET_GOTO(!kgctx, ret, -1, errhyb);
ret2 = EVP_PKEY_keygen_init(kgctx);