int
sc_pkcs15_convert_pubkey(struct sc_pkcs15_pubkey *pkcs15_key, void *evp_key)
{
#ifdef ENABLE_OPENSSL
EVP_PKEY *pk = (EVP_PKEY *)evp_key;
switch (pk->type) {
case EVP_PKEY_RSA: {
struct sc_pkcs15_pubkey_rsa *dst = &pkcs15_key->u.rsa;
RSA *src = EVP_PKEY_get1_RSA(pk);
pkcs15_key->algorithm = SC_ALGORITHM_RSA;
if (!sc_pkcs15_convert_bignum(&dst->modulus, src->n) || !sc_pkcs15_convert_bignum(&dst->exponent, src->e))
return SC_ERROR_INVALID_DATA;
RSA_free(src);
break;
}
case EVP_PKEY_DSA: {
struct sc_pkcs15_pubkey_dsa *dst = &pkcs15_key->u.dsa;
DSA *src = EVP_PKEY_get1_DSA(pk);
pkcs15_key->algorithm = SC_ALGORITHM_DSA;
sc_pkcs15_convert_bignum(&dst->pub, src->pub_key);
sc_pkcs15_convert_bignum(&dst->p, src->p);
sc_pkcs15_convert_bignum(&dst->q, src->q);
sc_pkcs15_convert_bignum(&dst->g, src->g);
DSA_free(src);
break;
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L && !defined(OPENSSL_NO_EC)
case NID_id_GostR3410_2001: {
struct sc_pkcs15_pubkey_gostr3410 *dst = &pkcs15_key->u.gostr3410;
EC_KEY *eckey = EVP_PKEY_get0(pk);
const EC_POINT *point;
BIGNUM *X, *Y;
int r = 0;
assert(eckey);
point = EC_KEY_get0_public_key(eckey);
if (!point)
return SC_ERROR_INTERNAL;
X = BN_new();
Y = BN_new();
if (X && Y && EC_KEY_get0_group(eckey))
r = EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(eckey),
point, X, Y, NULL);
if (r == 1) {
dst->xy.len = BN_num_bytes(X) + BN_num_bytes(Y);
dst->xy.data = malloc(dst->xy.len);
if (dst->xy.data) {
BN_bn2bin(Y, dst->xy.data);
BN_bn2bin(X, dst->xy.data + BN_num_bytes(Y));
r = sc_mem_reverse(dst->xy.data, dst->xy.len);
if (!r)
r = 1;
pkcs15_key->algorithm = SC_ALGORITHM_GOSTR3410;
}
else
r = -1;
}
BN_free(X);
BN_free(Y);
if (r != 1)
return SC_ERROR_INTERNAL;
break;
}
case EVP_PKEY_EC: {
struct sc_pkcs15_pubkey_ec *dst = &pkcs15_key->u.ec;
EC_KEY *src = NULL;
const EC_GROUP *grp = NULL;
unsigned char buf[255];
size_t buflen = 255;
int nid;
src = EVP_PKEY_get0(pk);
assert(src);
assert(EC_KEY_get0_public_key(src));
pkcs15_key->algorithm = SC_ALGORITHM_EC;
grp = EC_KEY_get0_group(src);
if(grp == 0)
return SC_ERROR_INCOMPATIBLE_KEY;
/* Decode EC_POINT from a octet string */
buflen = EC_POINT_point2oct(grp, (const EC_POINT *) EC_KEY_get0_public_key(src),
POINT_CONVERSION_UNCOMPRESSED, buf, buflen, NULL);
/* get curve name */
nid = EC_GROUP_get_curve_name(grp);
if(nid != 0) {
const char *name = OBJ_nid2sn(nid);
if(sizeof(name) > 0)
dst->params.named_curve = strdup(name);
}
/* copy the public key */
if (buflen > 0) {
dst->ecpointQ.value = malloc(buflen);
memcpy(dst->ecpointQ.value, buf, buflen);
dst->ecpointQ.len = buflen;
/* calculate the field length */
dst->params.field_length = (buflen - 1) / 2 * 8;
}
else
return SC_ERROR_INCOMPATIBLE_KEY;
break;
}
#endif /* OPENSSL_VERSION_NUMBER >= 0x10000000L && !defined(OPENSSL_NO_EC) */
default:
return SC_ERROR_NOT_SUPPORTED;
}
return SC_SUCCESS;
#else
return SC_ERROR_NOT_IMPLEMENTED;
#endif
}
LIBOPENSC_API int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
unsigned long flags, const u8 *in, size_t inlen,
u8 *out, size_t outlen)
{
sc_context_t *ctx = p15card->card->ctx;
int r;
sc_security_env_t senv;
sc_algorithm_info_t *alg_info;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
u8 buf[1024], *tmp;
size_t modlen;
unsigned long pad_flags = 0, sec_flags = 0;
LOG_FUNC_CALLED(ctx);
sc_log(ctx, "security operation flags 0x%X", flags);
memset(&senv, 0, sizeof(senv));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(&senv.supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv.supported_algos));
if ((obj->type & SC_PKCS15_TYPE_CLASS_MASK) != SC_PKCS15_TYPE_PRKEY)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This is not a private key");
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_SIGN|SC_PKCS15_PRKEY_USAGE_SIGNRECOVER|
SC_PKCS15_PRKEY_USAGE_NONREPUDIATION)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for signing");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
modlen = prkey->modulus_length / 8;
alg_info = sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support RSA with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.algorithm = SC_ALGORITHM_RSA;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
modlen = (prkey->modulus_length + 7) / 8 * 2;
alg_info = sc_card_find_gostr3410_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support GOSTR3410 with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.algorithm = SC_ALGORITHM_GOSTR3410;
break;
case SC_PKCS15_TYPE_PRKEY_EC:
modlen = ((prkey->field_length +7) / 8) * 2; /* 2*nLen */
alg_info = sc_card_find_ec_alg(p15card->card, prkey->field_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support EC with field_size %d", prkey->field_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.algorithm = SC_ALGORITHM_EC;
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.flags |= SC_SEC_ENV_ALG_REF_PRESENT;
senv.algorithm_ref = prkey->field_length;
break;
/* add other crypto types here */
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "Key type not supported");
}
/* Probably never happens, but better make sure */
if (inlen > sizeof(buf) || outlen < modlen)
LOG_FUNC_RETURN(ctx, SC_ERROR_BUFFER_TOO_SMALL);
memcpy(buf, in, inlen);
/* revert data to sign when signing with the GOST key.
* TODO: can it be confirmed by the GOST standard?
* TODO: tested with RuTokenECP, has to be validated for RuToken. */
if (obj->type == SC_PKCS15_TYPE_PRKEY_GOSTR3410)
sc_mem_reverse(buf, inlen);
tmp = buf;
/* flags: the requested algo
* algo_info->flags: what is supported by the card
* senv.algorithm_flags: what the card will have to do */
/* if the card has SC_ALGORITHM_NEED_USAGE set, and the
key is for signing and decryption, we need to emulate signing */
/* TODO: -DEE assume only RSA keys will ever use _NEED_USAGE */
sc_log(ctx, "supported algorithm flags 0x%X, private key usage 0x%X", alg_info->flags, prkey->usage);
if ((alg_info->flags & SC_ALGORITHM_NEED_USAGE) &&
((prkey->usage & USAGE_ANY_SIGN) &&
(prkey->usage & USAGE_ANY_DECIPHER)) ) {
size_t tmplen = sizeof(buf);
if (flags & SC_ALGORITHM_RSA_RAW) {
r = sc_pkcs15_decipher(p15card, obj,flags, in, inlen, out, outlen);
LOG_FUNC_RETURN(ctx, r);
}
if (modlen > tmplen)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "Buffer too small, needs recompile!");
r = sc_pkcs1_encode(ctx, flags, in, inlen, buf, &tmplen, modlen);
/* no padding needed - already done */
flags &= ~SC_ALGORITHM_RSA_PADS;
/* instead use raw rsa */
flags |= SC_ALGORITHM_RSA_RAW;
LOG_TEST_RET(ctx, r, "Unable to add padding");
r = sc_pkcs15_decipher(p15card, obj,flags, buf, modlen, out, outlen);
LOG_FUNC_RETURN(ctx, r);
}
/* If the card doesn't support the requested algorithm, see if we
* can strip the input so a more restrictive algo can be used */
if ((flags == (SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_NONE)) &&
!(alg_info->flags & (SC_ALGORITHM_RSA_RAW | SC_ALGORITHM_RSA_HASH_NONE))) {
unsigned int algo;
size_t tmplen = sizeof(buf);
r = sc_pkcs1_strip_digest_info_prefix(&algo, tmp, inlen, tmp, &tmplen);
if (r != SC_SUCCESS || algo == SC_ALGORITHM_RSA_HASH_NONE) {
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, SC_ERROR_INVALID_DATA);
}
flags &= ~SC_ALGORITHM_RSA_HASH_NONE;
flags |= algo;
inlen = tmplen;
}
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
if (r != SC_SUCCESS) {
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, r);
}
senv.algorithm_flags = sec_flags;
sc_log(ctx, "DEE flags:0x%8.8x alg_info->flags:0x%8.8x pad:0x%8.8x sec:0x%8.8x",
flags, alg_info->flags, pad_flags, sec_flags);
/* add the padding bytes (if necessary) */
if (pad_flags != 0) {
size_t tmplen = sizeof(buf);
r = sc_pkcs1_encode(ctx, pad_flags, tmp, inlen, tmp, &tmplen, modlen);
SC_TEST_RET(ctx, SC_LOG_DEBUG_NORMAL, r, "Unable to add padding");
inlen = tmplen;
}
else if ( senv.algorithm == SC_ALGORITHM_RSA &&
(flags & SC_ALGORITHM_RSA_PADS) == SC_ALGORITHM_RSA_PAD_NONE) {
/* Add zero-padding if input is shorter than the modulus */
if (inlen < modlen) {
if (modlen > sizeof(buf))
return SC_ERROR_BUFFER_TOO_SMALL;
memmove(tmp+modlen-inlen, tmp, inlen);
memset(tmp, 0, modlen-inlen);
}
inlen = modlen;
}
senv.operation = SC_SEC_OPERATION_SIGN;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv.key_ref_len = 1;
senv.key_ref[0] = prkey->key_reference & 0xFF;
senv.flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
r = sc_lock(p15card->card);
LOG_TEST_RET(ctx, r, "sc_lock() failed");
sc_log(ctx, "Private key path '%s'", sc_print_path(&prkey->path));
if (prkey->path.len != 0 || prkey->path.aid.len != 0) {
r = select_key_file(p15card, prkey, &senv);
if (r < 0) {
sc_unlock(p15card->card);
LOG_TEST_RET(ctx, r,"Unable to select private key file");
}
}
r = sc_set_security_env(p15card->card, &senv, 0);
if (r < 0) {
sc_unlock(p15card->card);
LOG_TEST_RET(ctx, r, "sc_set_security_env() failed");
}
r = sc_compute_signature(p15card->card, tmp, inlen, out, outlen);
if (r == SC_ERROR_SECURITY_STATUS_NOT_SATISFIED)
if (sc_pkcs15_pincache_revalidate(p15card, obj) == SC_SUCCESS)
r = sc_compute_signature(p15card->card, tmp, inlen, out, outlen);
sc_mem_clear(buf, sizeof(buf));
sc_unlock(p15card->card);
LOG_TEST_RET(ctx, r, "sc_compute_signature() failed");
LOG_FUNC_RETURN(ctx, r);
}
