diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/ec/ec_key.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/ec/ec_key.c | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/ec/ec_key.c b/openssl-1.1.0h/crypto/ec/ec_key.c new file mode 100644 index 0000000..f1f0afb --- /dev/null +++ b/openssl-1.1.0h/crypto/ec/ec_key.c @@ -0,0 +1,637 @@ +/* + * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (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 + * https://www.openssl.org/source/license.html + */ + +/* ==================================================================== + * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. + * Portions originally developed by SUN MICROSYSTEMS, INC., and + * contributed to the OpenSSL project. + */ + +#include <internal/cryptlib.h> +#include <string.h> +#include "ec_lcl.h" +#include <openssl/err.h> +#include <openssl/engine.h> + +EC_KEY *EC_KEY_new(void) +{ + return EC_KEY_new_method(NULL); +} + +EC_KEY *EC_KEY_new_by_curve_name(int nid) +{ + EC_KEY *ret = EC_KEY_new(); + if (ret == NULL) + return NULL; + ret->group = EC_GROUP_new_by_curve_name(nid); + if (ret->group == NULL) { + EC_KEY_free(ret); + return NULL; + } + if (ret->meth->set_group != NULL + && ret->meth->set_group(ret, ret->group) == 0) { + EC_KEY_free(ret); + return NULL; + } + return ret; +} + +void EC_KEY_free(EC_KEY *r) +{ + int i; + + if (r == NULL) + return; + + CRYPTO_atomic_add(&r->references, -1, &i, r->lock); + REF_PRINT_COUNT("EC_KEY", r); + if (i > 0) + return; + REF_ASSERT_ISNT(i < 0); + + if (r->meth->finish != NULL) + r->meth->finish(r); + +#ifndef OPENSSL_NO_ENGINE + ENGINE_finish(r->engine); +#endif + + if (r->group && r->group->meth->keyfinish) + r->group->meth->keyfinish(r); + + CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data); + CRYPTO_THREAD_lock_free(r->lock); + EC_GROUP_free(r->group); + EC_POINT_free(r->pub_key); + BN_clear_free(r->priv_key); + + OPENSSL_clear_free((void *)r, sizeof(EC_KEY)); +} + +EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) +{ + if (dest == NULL || src == NULL) { + ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER); + return NULL; + } + if (src->meth != dest->meth) { + if (dest->meth->finish != NULL) + dest->meth->finish(dest); + if (dest->group && dest->group->meth->keyfinish) + dest->group->meth->keyfinish(dest); +#ifndef OPENSSL_NO_ENGINE + if (ENGINE_finish(dest->engine) == 0) + return 0; + dest->engine = NULL; +#endif + } + /* copy the parameters */ + if (src->group != NULL) { + const EC_METHOD *meth = EC_GROUP_method_of(src->group); + /* clear the old group */ + EC_GROUP_free(dest->group); + dest->group = EC_GROUP_new(meth); + if (dest->group == NULL) + return NULL; + if (!EC_GROUP_copy(dest->group, src->group)) + return NULL; + + /* copy the public key */ + if (src->pub_key != NULL) { + EC_POINT_free(dest->pub_key); + dest->pub_key = EC_POINT_new(src->group); + if (dest->pub_key == NULL) + return NULL; + if (!EC_POINT_copy(dest->pub_key, src->pub_key)) + return NULL; + } + /* copy the private key */ + if (src->priv_key != NULL) { + if (dest->priv_key == NULL) { + dest->priv_key = BN_new(); + if (dest->priv_key == NULL) + return NULL; + } + if (!BN_copy(dest->priv_key, src->priv_key)) + return NULL; + if (src->group->meth->keycopy + && src->group->meth->keycopy(dest, src) == 0) + return NULL; + } + } + + + /* copy the rest */ + dest->enc_flag = src->enc_flag; + dest->conv_form = src->conv_form; + dest->version = src->version; + dest->flags = src->flags; + if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, + &dest->ex_data, &src->ex_data)) + return NULL; + + if (src->meth != dest->meth) { +#ifndef OPENSSL_NO_ENGINE + if (src->engine != NULL && ENGINE_init(src->engine) == 0) + return NULL; + dest->engine = src->engine; +#endif + dest->meth = src->meth; + } + + if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0) + return NULL; + + return dest; +} + +EC_KEY *EC_KEY_dup(const EC_KEY *ec_key) +{ + EC_KEY *ret = EC_KEY_new_method(ec_key->engine); + + if (ret == NULL) + return NULL; + + if (EC_KEY_copy(ret, ec_key) == NULL) { + EC_KEY_free(ret); + return NULL; + } + return ret; +} + +int EC_KEY_up_ref(EC_KEY *r) +{ + int i; + + if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0) + return 0; + + REF_PRINT_COUNT("EC_KEY", r); + REF_ASSERT_ISNT(i < 2); + return ((i > 1) ? 1 : 0); +} + +int EC_KEY_generate_key(EC_KEY *eckey) +{ + if (eckey == NULL || eckey->group == NULL) { + ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + if (eckey->meth->keygen != NULL) + return eckey->meth->keygen(eckey); + ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED); + return 0; +} + +int ossl_ec_key_gen(EC_KEY *eckey) +{ + OPENSSL_assert(eckey->group->meth->keygen != NULL); + return eckey->group->meth->keygen(eckey); +} + +int ec_key_simple_generate_key(EC_KEY *eckey) +{ + int ok = 0; + BN_CTX *ctx = NULL; + BIGNUM *priv_key = NULL; + const BIGNUM *order = NULL; + EC_POINT *pub_key = NULL; + + if ((ctx = BN_CTX_new()) == NULL) + goto err; + + if (eckey->priv_key == NULL) { + priv_key = BN_new(); + if (priv_key == NULL) + goto err; + } else + priv_key = eckey->priv_key; + + order = EC_GROUP_get0_order(eckey->group); + if (order == NULL) + goto err; + + do + if (!BN_rand_range(priv_key, order)) + goto err; + while (BN_is_zero(priv_key)) ; + + if (eckey->pub_key == NULL) { + pub_key = EC_POINT_new(eckey->group); + if (pub_key == NULL) + goto err; + } else + pub_key = eckey->pub_key; + + if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) + goto err; + + eckey->priv_key = priv_key; + eckey->pub_key = pub_key; + + ok = 1; + + err: + if (eckey->pub_key == NULL) + EC_POINT_free(pub_key); + if (eckey->priv_key != priv_key) + BN_free(priv_key); + BN_CTX_free(ctx); + return ok; +} + +int ec_key_simple_generate_public_key(EC_KEY *eckey) +{ + return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL, + NULL, NULL); +} + +int EC_KEY_check_key(const EC_KEY *eckey) +{ + if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) { + ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + + if (eckey->group->meth->keycheck == NULL) { + ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); + return 0; + } + + return eckey->group->meth->keycheck(eckey); +} + +int ec_key_simple_check_key(const EC_KEY *eckey) +{ + int ok = 0; + BN_CTX *ctx = NULL; + const BIGNUM *order = NULL; + EC_POINT *point = NULL; + + if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + + if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY); + goto err; + } + + if ((ctx = BN_CTX_new()) == NULL) + goto err; + if ((point = EC_POINT_new(eckey->group)) == NULL) + goto err; + + /* testing whether the pub_key is on the elliptic curve */ + if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE); + goto err; + } + /* testing whether pub_key * order is the point at infinity */ + order = eckey->group->order; + if (BN_is_zero(order)) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER); + goto err; + } + if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB); + goto err; + } + if (!EC_POINT_is_at_infinity(eckey->group, point)) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER); + goto err; + } + /* + * in case the priv_key is present : check if generator * priv_key == + * pub_key + */ + if (eckey->priv_key != NULL) { + if (BN_cmp(eckey->priv_key, order) >= 0) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER); + goto err; + } + if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, + NULL, NULL, ctx)) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB); + goto err; + } + if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { + ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY); + goto err; + } + } + ok = 1; + err: + BN_CTX_free(ctx); + EC_POINT_free(point); + return ok; +} + +int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, + BIGNUM *y) +{ + BN_CTX *ctx = NULL; + BIGNUM *tx, *ty; + EC_POINT *point = NULL; + int ok = 0; +#ifndef OPENSSL_NO_EC2M + int tmp_nid, is_char_two = 0; +#endif + + if (key == NULL || key->group == NULL || x == NULL || y == NULL) { + ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, + ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + ctx = BN_CTX_new(); + if (ctx == NULL) + return 0; + + BN_CTX_start(ctx); + point = EC_POINT_new(key->group); + + if (point == NULL) + goto err; + + tx = BN_CTX_get(ctx); + ty = BN_CTX_get(ctx); + if (ty == NULL) + goto err; + +#ifndef OPENSSL_NO_EC2M + tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group)); + + if (tmp_nid == NID_X9_62_characteristic_two_field) + is_char_two = 1; + + if (is_char_two) { + if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point, + x, y, ctx)) + goto err; + if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point, + tx, ty, ctx)) + goto err; + } else +#endif + { + if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, + x, y, ctx)) + goto err; + if (!EC_POINT_get_affine_coordinates_GFp(key->group, point, + tx, ty, ctx)) + goto err; + } + /* + * Check if retrieved coordinates match originals and are less than field + * order: if not values are out of range. + */ + if (BN_cmp(x, tx) || BN_cmp(y, ty) + || (BN_cmp(x, key->group->field) >= 0) + || (BN_cmp(y, key->group->field) >= 0)) { + ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, + EC_R_COORDINATES_OUT_OF_RANGE); + goto err; + } + + if (!EC_KEY_set_public_key(key, point)) + goto err; + + if (EC_KEY_check_key(key) == 0) + goto err; + + ok = 1; + + err: + BN_CTX_end(ctx); + BN_CTX_free(ctx); + EC_POINT_free(point); + return ok; + +} + +const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) +{ + return key->group; +} + +int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group) +{ + if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0) + return 0; + EC_GROUP_free(key->group); + key->group = EC_GROUP_dup(group); + return (key->group == NULL) ? 0 : 1; +} + +const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key) +{ + return key->priv_key; +} + +int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key) +{ + if (key->group == NULL || key->group->meth == NULL) + return 0; + if (key->group->meth->set_private != NULL + && key->group->meth->set_private(key, priv_key) == 0) + return 0; + if (key->meth->set_private != NULL + && key->meth->set_private(key, priv_key) == 0) + return 0; + BN_clear_free(key->priv_key); + key->priv_key = BN_dup(priv_key); + return (key->priv_key == NULL) ? 0 : 1; +} + +const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key) +{ + return key->pub_key; +} + +int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key) +{ + if (key->meth->set_public != NULL + && key->meth->set_public(key, pub_key) == 0) + return 0; + EC_POINT_free(key->pub_key); + key->pub_key = EC_POINT_dup(pub_key, key->group); + return (key->pub_key == NULL) ? 0 : 1; +} + +unsigned int EC_KEY_get_enc_flags(const EC_KEY *key) +{ + return key->enc_flag; +} + +void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags) +{ + key->enc_flag = flags; +} + +point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key) +{ + return key->conv_form; +} + +void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform) +{ + key->conv_form = cform; + if (key->group != NULL) + EC_GROUP_set_point_conversion_form(key->group, cform); +} + +void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) +{ + if (key->group != NULL) + EC_GROUP_set_asn1_flag(key->group, flag); +} + +int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx) +{ + if (key->group == NULL) + return 0; + return EC_GROUP_precompute_mult(key->group, ctx); +} + +int EC_KEY_get_flags(const EC_KEY *key) +{ + return key->flags; +} + +void EC_KEY_set_flags(EC_KEY *key, int flags) +{ + key->flags |= flags; +} + +void EC_KEY_clear_flags(EC_KEY *key, int flags) +{ + key->flags &= ~flags; +} + +size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form, + unsigned char **pbuf, BN_CTX *ctx) +{ + if (key == NULL || key->pub_key == NULL || key->group == NULL) + return 0; + return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx); +} + +int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len, + BN_CTX *ctx) +{ + if (key == NULL || key->group == NULL) + return 0; + if (key->pub_key == NULL) + key->pub_key = EC_POINT_new(key->group); + if (key->pub_key == NULL) + return 0; + if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0) + return 0; + /* + * Save the point conversion form. + * For non-custom curves the first octet of the buffer (excluding + * the last significant bit) contains the point conversion form. + * EC_POINT_oct2point() has already performed sanity checking of + * the buffer so we know it is valid. + */ + if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) + key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01); + return 1; +} + +size_t EC_KEY_priv2oct(const EC_KEY *eckey, + unsigned char *buf, size_t len) +{ + if (eckey->group == NULL || eckey->group->meth == NULL) + return 0; + if (eckey->group->meth->priv2oct == NULL) { + ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); + return 0; + } + + return eckey->group->meth->priv2oct(eckey, buf, len); +} + +size_t ec_key_simple_priv2oct(const EC_KEY *eckey, + unsigned char *buf, size_t len) +{ + size_t buf_len; + + buf_len = (EC_GROUP_order_bits(eckey->group) + 7) / 8; + if (eckey->priv_key == NULL) + return 0; + if (buf == NULL) + return buf_len; + else if (len < buf_len) + return 0; + + /* Octetstring may need leading zeros if BN is to short */ + + if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) { + ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL); + return 0; + } + + return buf_len; +} + +int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len) +{ + if (eckey->group == NULL || eckey->group->meth == NULL) + return 0; + if (eckey->group->meth->oct2priv == NULL) { + ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); + return 0; + } + return eckey->group->meth->oct2priv(eckey, buf, len); +} + +int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len) +{ + if (eckey->priv_key == NULL) + eckey->priv_key = BN_secure_new(); + if (eckey->priv_key == NULL) { + ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE); + return 0; + } + eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key); + if (eckey->priv_key == NULL) { + ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB); + return 0; + } + return 1; +} + +size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf) +{ + size_t len; + unsigned char *buf; + len = EC_KEY_priv2oct(eckey, NULL, 0); + if (len == 0) + return 0; + buf = OPENSSL_malloc(len); + if (buf == NULL) + return 0; + len = EC_KEY_priv2oct(eckey, buf, len); + if (len == 0) { + OPENSSL_free(buf); + return 0; + } + *pbuf = buf; + return len; +} + +int EC_KEY_can_sign(const EC_KEY *eckey) +{ + if (eckey->group == NULL || eckey->group->meth == NULL + || (eckey->group->meth->flags & EC_FLAGS_NO_SIGN)) + return 0; + return 1; +} |