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Commit | Line | Data |
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d2e9e320 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
3cdbea65 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
11 | #include <time.h> | |
b39fc560 | 12 | #include "internal/cryptlib.h" |
474e469b | 13 | #include <openssl/bn.h> |
1258396d | 14 | #include "dsa_locl.h" |
d02b48c6 | 15 | |
0e4aa0d2 GT |
16 | static int dsa_builtin_keygen(DSA *dsa); |
17 | ||
6b691a5c | 18 | int DSA_generate_key(DSA *dsa) |
0f113f3e MC |
19 | { |
20 | if (dsa->meth->dsa_keygen) | |
21 | return dsa->meth->dsa_keygen(dsa); | |
22 | return dsa_builtin_keygen(dsa); | |
23 | } | |
0e4aa0d2 GT |
24 | |
25 | static int dsa_builtin_keygen(DSA *dsa) | |
0f113f3e MC |
26 | { |
27 | int ok = 0; | |
28 | BN_CTX *ctx = NULL; | |
29 | BIGNUM *pub_key = NULL, *priv_key = NULL; | |
30 | ||
31 | if ((ctx = BN_CTX_new()) == NULL) | |
32 | goto err; | |
d02b48c6 | 33 | |
0f113f3e | 34 | if (dsa->priv_key == NULL) { |
74924dcb | 35 | if ((priv_key = BN_secure_new()) == NULL) |
0f113f3e MC |
36 | goto err; |
37 | } else | |
38 | priv_key = dsa->priv_key; | |
d02b48c6 | 39 | |
0f113f3e | 40 | do |
ddc6a5c8 | 41 | if (!BN_priv_rand_range(priv_key, dsa->q)) |
0f113f3e MC |
42 | goto err; |
43 | while (BN_is_zero(priv_key)) ; | |
d02b48c6 | 44 | |
0f113f3e MC |
45 | if (dsa->pub_key == NULL) { |
46 | if ((pub_key = BN_new()) == NULL) | |
47 | goto err; | |
48 | } else | |
49 | pub_key = dsa->pub_key; | |
d02b48c6 | 50 | |
0f113f3e | 51 | { |
5584f65a | 52 | BIGNUM *prk = BN_new(); |
46a64376 | 53 | |
5584f65a MC |
54 | if (prk == NULL) |
55 | goto err; | |
56 | BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); | |
d02b48c6 | 57 | |
0f113f3e | 58 | if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) { |
5584f65a | 59 | BN_free(prk); |
0f113f3e MC |
60 | goto err; |
61 | } | |
5584f65a MC |
62 | /* We MUST free prk before any further use of priv_key */ |
63 | BN_free(prk); | |
0f113f3e | 64 | } |
d02b48c6 | 65 | |
0f113f3e MC |
66 | dsa->priv_key = priv_key; |
67 | dsa->pub_key = pub_key; | |
4889dadc | 68 | dsa->dirty_cnt++; |
0f113f3e | 69 | ok = 1; |
d02b48c6 | 70 | |
0f113f3e | 71 | err: |
23a1d5e9 | 72 | if (pub_key != dsa->pub_key) |
0f113f3e | 73 | BN_free(pub_key); |
23a1d5e9 | 74 | if (priv_key != dsa->priv_key) |
0f113f3e | 75 | BN_free(priv_key); |
23a1d5e9 | 76 | BN_CTX_free(ctx); |
26a7d938 | 77 | return ok; |
0f113f3e | 78 | } |