1 | /* |
2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
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 |
8 | */ |
9 | |
10 | #include <stdio.h> |
11 | #include "internal/cryptlib.h" |
12 | #include <openssl/pkcs12.h> |
13 | #include <openssl/bn.h> |
14 | #include <openssl/trace.h> |
15 | |
16 | /* PKCS12 compatible key/IV generation */ |
17 | #ifndef min |
18 | # define min(a,b) ((a) < (b) ? (a) : (b)) |
19 | #endif |
20 | |
21 | int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt, |
22 | int saltlen, int id, int iter, int n, |
23 | unsigned char *out, const EVP_MD *md_type) |
24 | { |
25 | int ret; |
26 | unsigned char *unipass; |
27 | int uniplen; |
28 | |
29 | if (pass == NULL) { |
30 | unipass = NULL; |
31 | uniplen = 0; |
32 | } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) { |
33 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE); |
34 | return 0; |
35 | } |
36 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen, |
37 | id, iter, n, out, md_type); |
38 | if (ret <= 0) |
39 | return 0; |
40 | OPENSSL_clear_free(unipass, uniplen); |
41 | return ret; |
42 | } |
43 | |
44 | int PKCS12_key_gen_utf8(const char *pass, int passlen, unsigned char *salt, |
45 | int saltlen, int id, int iter, int n, |
46 | unsigned char *out, const EVP_MD *md_type) |
47 | { |
48 | int ret; |
49 | unsigned char *unipass; |
50 | int uniplen; |
51 | |
52 | if (pass == NULL) { |
53 | unipass = NULL; |
54 | uniplen = 0; |
55 | } else if (!OPENSSL_utf82uni(pass, passlen, &unipass, &uniplen)) { |
56 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UTF8, ERR_R_MALLOC_FAILURE); |
57 | return 0; |
58 | } |
59 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen, |
60 | id, iter, n, out, md_type); |
61 | if (ret <= 0) |
62 | return 0; |
63 | OPENSSL_clear_free(unipass, uniplen); |
64 | return ret; |
65 | } |
66 | |
67 | int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt, |
68 | int saltlen, int id, int iter, int n, |
69 | unsigned char *out, const EVP_MD *md_type) |
70 | { |
71 | unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL; |
72 | int Slen, Plen, Ilen; |
73 | int i, j, u, v; |
74 | int ret = 0; |
75 | EVP_MD_CTX *ctx = NULL; |
76 | unsigned char *tmpout = out; |
77 | int tmpn = n; |
78 | |
79 | ctx = EVP_MD_CTX_new(); |
80 | if (ctx == NULL) |
81 | goto err; |
82 | |
83 | OSSL_TRACE_BEGIN(PKCS12_KEYGEN) { |
84 | BIO_printf(trc_out, "PKCS12_key_gen_uni(): ID %d, ITER %d\n" , id, iter); |
85 | BIO_printf(trc_out, "Password (length %d):\n" , passlen); |
86 | BIO_hex_string(trc_out, 0, passlen, pass, passlen); |
87 | BIO_printf(trc_out, "\n" ); |
88 | BIO_printf(trc_out, "Salt (length %d):\n" , saltlen); |
89 | BIO_hex_string(trc_out, 0, saltlen, salt, saltlen); |
90 | BIO_printf(trc_out, "\n" ); |
91 | } OSSL_TRACE_END(PKCS12_KEYGEN); |
92 | v = EVP_MD_block_size(md_type); |
93 | u = EVP_MD_size(md_type); |
94 | if (u < 0 || v <= 0) |
95 | goto err; |
96 | D = OPENSSL_malloc(v); |
97 | Ai = OPENSSL_malloc(u); |
98 | B = OPENSSL_malloc(v + 1); |
99 | Slen = v * ((saltlen + v - 1) / v); |
100 | if (passlen) |
101 | Plen = v * ((passlen + v - 1) / v); |
102 | else |
103 | Plen = 0; |
104 | Ilen = Slen + Plen; |
105 | I = OPENSSL_malloc(Ilen); |
106 | if (D == NULL || Ai == NULL || B == NULL || I == NULL) |
107 | goto err; |
108 | for (i = 0; i < v; i++) |
109 | D[i] = id; |
110 | p = I; |
111 | for (i = 0; i < Slen; i++) |
112 | *p++ = salt[i % saltlen]; |
113 | for (i = 0; i < Plen; i++) |
114 | *p++ = pass[i % passlen]; |
115 | for (;;) { |
116 | if (!EVP_DigestInit_ex(ctx, md_type, NULL) |
117 | || !EVP_DigestUpdate(ctx, D, v) |
118 | || !EVP_DigestUpdate(ctx, I, Ilen) |
119 | || !EVP_DigestFinal_ex(ctx, Ai, NULL)) |
120 | goto err; |
121 | for (j = 1; j < iter; j++) { |
122 | if (!EVP_DigestInit_ex(ctx, md_type, NULL) |
123 | || !EVP_DigestUpdate(ctx, Ai, u) |
124 | || !EVP_DigestFinal_ex(ctx, Ai, NULL)) |
125 | goto err; |
126 | } |
127 | memcpy(out, Ai, min(n, u)); |
128 | if (u >= n) { |
129 | OSSL_TRACE_BEGIN(PKCS12_KEYGEN) { |
130 | BIO_printf(trc_out, "Output KEY (length %d)\n" , tmpn); |
131 | BIO_hex_string(trc_out, 0, tmpn, tmpout, tmpn); |
132 | BIO_printf(trc_out, "\n" ); |
133 | } OSSL_TRACE_END(PKCS12_KEYGEN); |
134 | ret = 1; |
135 | goto end; |
136 | } |
137 | n -= u; |
138 | out += u; |
139 | for (j = 0; j < v; j++) |
140 | B[j] = Ai[j % u]; |
141 | for (j = 0; j < Ilen; j += v) { |
142 | int k; |
143 | unsigned char *Ij = I + j; |
144 | uint16_t c = 1; |
145 | |
146 | /* Work out Ij = Ij + B + 1 */ |
147 | for (k = v - 1; k >= 0; k--) { |
148 | c += Ij[k] + B[k]; |
149 | Ij[k] = (unsigned char)c; |
150 | c >>= 8; |
151 | } |
152 | } |
153 | } |
154 | |
155 | err: |
156 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE); |
157 | |
158 | end: |
159 | OPENSSL_free(Ai); |
160 | OPENSSL_free(B); |
161 | OPENSSL_free(D); |
162 | OPENSSL_free(I); |
163 | EVP_MD_CTX_free(ctx); |
164 | return ret; |
165 | } |
166 | |