| 1 | /*
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| 2 | * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * DSA low level APIs are deprecated for public use, but still ok for
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| 12 | * internal use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include "internal/cryptlib.h"
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| 18 | #include <openssl/bn.h>
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| 19 | #include "dsa_local.h"
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| 20 | #include "crypto/dsa.h"
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| 21 |
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| 22 | int ossl_dsa_check_params(const DSA *dsa, int checktype, int *ret)
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| 23 | {
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| 24 | if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
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| 25 | return ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
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| 26 | FFC_PARAM_TYPE_DSA, ret);
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| 27 | else
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| 28 | /*
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| 29 | * Do full FFC domain params validation according to FIPS-186-4
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| 30 | * - always in FIPS_MODULE
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| 31 | * - only if possible (i.e., seed is set) in default provider
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| 32 | */
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| 33 | return ossl_ffc_params_full_validate(dsa->libctx, &dsa->params,
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| 34 | FFC_PARAM_TYPE_DSA, ret);
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| 35 | }
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| 36 |
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| 37 | /*
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| 38 | * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Full public key validation.
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| 39 | */
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| 40 | int ossl_dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret)
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| 41 | {
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| 42 | return ossl_ffc_validate_public_key(&dsa->params, pub_key, ret)
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| 43 | && *ret == 0;
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| 44 | }
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| 45 |
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| 46 | /*
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| 47 | * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Partial public key validation.
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| 48 | * To only be used with ephemeral FFC public keys generated using the approved
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| 49 | * safe-prime groups.
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| 50 | */
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| 51 | int ossl_dsa_check_pub_key_partial(const DSA *dsa, const BIGNUM *pub_key, int *ret)
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| 52 | {
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| 53 | return ossl_ffc_validate_public_key_partial(&dsa->params, pub_key, ret)
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| 54 | && *ret == 0;
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| 55 | }
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| 56 |
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| 57 | int ossl_dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret)
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| 58 | {
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| 59 | *ret = 0;
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| 60 |
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| 61 | return (dsa->params.q != NULL
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| 62 | && ossl_ffc_validate_private_key(dsa->params.q, priv_key, ret));
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| 63 | }
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| 64 |
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| 65 | /*
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| 66 | * FFC pairwise check from SP800-56A R3.
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| 67 | * Section 5.6.2.1.4 Owner Assurance of Pair-wise Consistency
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| 68 | */
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| 69 | int ossl_dsa_check_pairwise(const DSA *dsa)
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| 70 | {
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| 71 | int ret = 0;
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| 72 | BN_CTX *ctx = NULL;
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| 73 | BIGNUM *pub_key = NULL;
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| 74 |
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| 75 | if (dsa->params.p == NULL
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| 76 | || dsa->params.g == NULL
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| 77 | || dsa->priv_key == NULL
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| 78 | || dsa->pub_key == NULL)
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| 79 | return 0;
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| 80 |
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| 81 | ctx = BN_CTX_new_ex(dsa->libctx);
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| 82 | if (ctx == NULL)
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| 83 | goto err;
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| 84 | pub_key = BN_new();
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| 85 | if (pub_key == NULL)
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| 86 | goto err;
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| 87 |
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| 88 | /* recalculate the public key = (g ^ priv) mod p */
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| 89 | if (!ossl_dsa_generate_public_key(ctx, dsa, dsa->priv_key, pub_key))
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| 90 | goto err;
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| 91 | /* check it matches the existing pubic_key */
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| 92 | ret = BN_cmp(pub_key, dsa->pub_key) == 0;
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| 93 | err:
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| 94 | BN_free(pub_key);
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| 95 | BN_CTX_free(ctx);
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| 96 | return ret;
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| 97 | }
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