[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (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 | #include <stdio.h>
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| 11 | #include <time.h>
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| 12 | #include "internal/cryptlib.h"
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| 13 | #include <openssl/bn.h>
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| 14 | #include "dsa_locl.h"
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| 15 |
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| 16 | static int dsa_builtin_keygen(DSA *dsa);
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| 17 |
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| 18 | int DSA_generate_key(DSA *dsa)
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| 19 | {
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| 20 | if (dsa->meth->dsa_keygen)
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| 21 | return dsa->meth->dsa_keygen(dsa);
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| 22 | return dsa_builtin_keygen(dsa);
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| 23 | }
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| 24 |
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| 25 | static int dsa_builtin_keygen(DSA *dsa)
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| 26 | {
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| 27 | int ok = 0;
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| 28 | BN_CTX *ctx = NULL;
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| 29 | BIGNUM *pub_key = NULL, *priv_key = NULL;
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| 30 |
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| 31 | if ((ctx = BN_CTX_new()) == NULL)
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| 32 | goto err;
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| 33 |
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| 34 | if (dsa->priv_key == NULL) {
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| 35 | if ((priv_key = BN_secure_new()) == NULL)
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| 36 | goto err;
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| 37 | } else
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| 38 | priv_key = dsa->priv_key;
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| 39 |
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| 40 | do
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| 41 | if (!BN_rand_range(priv_key, dsa->q))
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| 42 | goto err;
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| 43 | while (BN_is_zero(priv_key)) ;
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| 44 |
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| 45 | if (dsa->pub_key == NULL) {
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| 46 | if ((pub_key = BN_new()) == NULL)
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| 47 | goto err;
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| 48 | } else
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| 49 | pub_key = dsa->pub_key;
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| 50 |
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| 51 | {
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| 52 | BIGNUM *prk = BN_new();
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| 53 |
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| 54 | if (prk == NULL)
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| 55 | goto err;
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| 56 | BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
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| 57 |
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| 58 | if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) {
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| 59 | BN_free(prk);
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| 60 | goto err;
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| 61 | }
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| 62 | /* We MUST free prk before any further use of priv_key */
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| 63 | BN_free(prk);
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| 64 | }
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| 65 |
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| 66 | dsa->priv_key = priv_key;
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| 67 | dsa->pub_key = pub_key;
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| 68 | ok = 1;
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| 69 |
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| 70 | err:
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| 71 | if (pub_key != dsa->pub_key)
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| 72 | BN_free(pub_key);
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| 73 | if (priv_key != dsa->priv_key)
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| 74 | BN_free(priv_key);
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| 75 | BN_CTX_free(ctx);
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| 76 | return (ok);
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| 77 | }
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