[331] | 1 | /*
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| 2 | * Copyright 1999-2016 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 "internal/cryptlib.h"
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| 12 | #include <openssl/pkcs12.h>
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| 13 | #include <openssl/bn.h>
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| 14 |
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| 15 | /* Uncomment out this line to get debugging info about key generation */
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| 16 | /*
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| 17 | * #define OPENSSL_DEBUG_KEYGEN
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| 18 | */
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| 19 | #ifdef OPENSSL_DEBUG_KEYGEN
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| 20 | # include <openssl/bio.h>
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| 21 | extern BIO *bio_err;
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| 22 | void h__dump(unsigned char *p, int len);
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| 23 | #endif
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| 24 |
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| 25 | /* PKCS12 compatible key/IV generation */
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| 26 | #ifndef min
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| 27 | # define min(a,b) ((a) < (b) ? (a) : (b))
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| 28 | #endif
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| 29 |
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| 30 | int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
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| 31 | int saltlen, int id, int iter, int n,
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| 32 | unsigned char *out, const EVP_MD *md_type)
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| 33 | {
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| 34 | int ret;
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| 35 | unsigned char *unipass;
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| 36 | int uniplen;
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| 37 |
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| 38 | if (!pass) {
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| 39 | unipass = NULL;
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| 40 | uniplen = 0;
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| 41 | } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
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| 42 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
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| 43 | return 0;
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| 44 | }
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| 45 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
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| 46 | id, iter, n, out, md_type);
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| 47 | if (ret <= 0)
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| 48 | return 0;
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| 49 | OPENSSL_clear_free(unipass, uniplen);
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| 50 | return ret;
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| 51 | }
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| 52 |
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| 53 | int PKCS12_key_gen_utf8(const char *pass, int passlen, unsigned char *salt,
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| 54 | int saltlen, int id, int iter, int n,
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| 55 | unsigned char *out, const EVP_MD *md_type)
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| 56 | {
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| 57 | int ret;
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| 58 | unsigned char *unipass;
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| 59 | int uniplen;
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| 60 |
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| 61 | if (!pass) {
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| 62 | unipass = NULL;
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| 63 | uniplen = 0;
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| 64 | } else if (!OPENSSL_utf82uni(pass, passlen, &unipass, &uniplen)) {
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| 65 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UTF8, ERR_R_MALLOC_FAILURE);
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| 66 | return 0;
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| 67 | }
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| 68 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
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| 69 | id, iter, n, out, md_type);
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| 70 | if (ret <= 0)
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| 71 | return 0;
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| 72 | OPENSSL_clear_free(unipass, uniplen);
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| 73 | return ret;
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| 74 | }
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| 75 |
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| 76 | int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
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| 77 | int saltlen, int id, int iter, int n,
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| 78 | unsigned char *out, const EVP_MD *md_type)
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| 79 | {
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| 80 | unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
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| 81 | int Slen, Plen, Ilen, Ijlen;
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| 82 | int i, j, u, v;
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| 83 | int ret = 0;
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| 84 | BIGNUM *Ij = NULL, *Bpl1 = NULL; /* These hold Ij and B + 1 */
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| 85 | EVP_MD_CTX *ctx = NULL;
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| 86 | #ifdef OPENSSL_DEBUG_KEYGEN
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| 87 | unsigned char *tmpout = out;
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| 88 | int tmpn = n;
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| 89 | #endif
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| 90 |
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| 91 | ctx = EVP_MD_CTX_new();
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| 92 | if (ctx == NULL)
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| 93 | goto err;
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| 94 |
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| 95 | #ifdef OPENSSL_DEBUG_KEYGEN
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| 96 | fprintf(stderr, "KEYGEN DEBUG\n");
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| 97 | fprintf(stderr, "ID %d, ITER %d\n", id, iter);
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| 98 | fprintf(stderr, "Password (length %d):\n", passlen);
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| 99 | h__dump(pass, passlen);
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| 100 | fprintf(stderr, "Salt (length %d):\n", saltlen);
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| 101 | h__dump(salt, saltlen);
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| 102 | #endif
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| 103 | v = EVP_MD_block_size(md_type);
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| 104 | u = EVP_MD_size(md_type);
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| 105 | if (u < 0 || v <= 0)
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| 106 | goto err;
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| 107 | D = OPENSSL_malloc(v);
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| 108 | Ai = OPENSSL_malloc(u);
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| 109 | B = OPENSSL_malloc(v + 1);
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| 110 | Slen = v * ((saltlen + v - 1) / v);
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| 111 | if (passlen)
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| 112 | Plen = v * ((passlen + v - 1) / v);
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| 113 | else
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| 114 | Plen = 0;
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| 115 | Ilen = Slen + Plen;
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| 116 | I = OPENSSL_malloc(Ilen);
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| 117 | Ij = BN_new();
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| 118 | Bpl1 = BN_new();
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| 119 | if (D == NULL || Ai == NULL || B == NULL || I == NULL || Ij == NULL
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| 120 | || Bpl1 == NULL)
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| 121 | goto err;
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| 122 | for (i = 0; i < v; i++)
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| 123 | D[i] = id;
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| 124 | p = I;
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| 125 | for (i = 0; i < Slen; i++)
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| 126 | *p++ = salt[i % saltlen];
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| 127 | for (i = 0; i < Plen; i++)
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| 128 | *p++ = pass[i % passlen];
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| 129 | for (;;) {
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| 130 | if (!EVP_DigestInit_ex(ctx, md_type, NULL)
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| 131 | || !EVP_DigestUpdate(ctx, D, v)
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| 132 | || !EVP_DigestUpdate(ctx, I, Ilen)
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| 133 | || !EVP_DigestFinal_ex(ctx, Ai, NULL))
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| 134 | goto err;
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| 135 | for (j = 1; j < iter; j++) {
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| 136 | if (!EVP_DigestInit_ex(ctx, md_type, NULL)
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| 137 | || !EVP_DigestUpdate(ctx, Ai, u)
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| 138 | || !EVP_DigestFinal_ex(ctx, Ai, NULL))
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| 139 | goto err;
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| 140 | }
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| 141 | memcpy(out, Ai, min(n, u));
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| 142 | if (u >= n) {
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| 143 | #ifdef OPENSSL_DEBUG_KEYGEN
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| 144 | fprintf(stderr, "Output KEY (length %d)\n", tmpn);
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| 145 | h__dump(tmpout, tmpn);
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| 146 | #endif
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| 147 | ret = 1;
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| 148 | goto end;
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| 149 | }
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| 150 | n -= u;
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| 151 | out += u;
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| 152 | for (j = 0; j < v; j++)
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| 153 | B[j] = Ai[j % u];
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| 154 | /* Work out B + 1 first then can use B as tmp space */
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| 155 | if (!BN_bin2bn(B, v, Bpl1))
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| 156 | goto err;
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| 157 | if (!BN_add_word(Bpl1, 1))
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| 158 | goto err;
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| 159 | for (j = 0; j < Ilen; j += v) {
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| 160 | if (!BN_bin2bn(I + j, v, Ij))
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| 161 | goto err;
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| 162 | if (!BN_add(Ij, Ij, Bpl1))
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| 163 | goto err;
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| 164 | if (!BN_bn2bin(Ij, B))
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| 165 | goto err;
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| 166 | Ijlen = BN_num_bytes(Ij);
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| 167 | /* If more than 2^(v*8) - 1 cut off MSB */
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| 168 | if (Ijlen > v) {
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| 169 | if (!BN_bn2bin(Ij, B))
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| 170 | goto err;
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| 171 | memcpy(I + j, B + 1, v);
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| 172 | #ifndef PKCS12_BROKEN_KEYGEN
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| 173 | /* If less than v bytes pad with zeroes */
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| 174 | } else if (Ijlen < v) {
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| 175 | memset(I + j, 0, v - Ijlen);
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| 176 | if (!BN_bn2bin(Ij, I + j + v - Ijlen))
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| 177 | goto err;
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| 178 | #endif
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| 179 | } else if (!BN_bn2bin(Ij, I + j))
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| 180 | goto err;
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | err:
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| 185 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
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| 186 |
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| 187 | end:
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| 188 | OPENSSL_free(Ai);
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| 189 | OPENSSL_free(B);
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| 190 | OPENSSL_free(D);
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| 191 | OPENSSL_free(I);
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| 192 | BN_free(Ij);
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| 193 | BN_free(Bpl1);
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| 194 | EVP_MD_CTX_free(ctx);
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| 195 | return ret;
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| 196 | }
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| 197 |
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| 198 | #ifdef OPENSSL_DEBUG_KEYGEN
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| 199 | void h__dump(unsigned char *p, int len)
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| 200 | {
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| 201 | for (; len--; p++)
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| 202 | fprintf(stderr, "%02X", *p);
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| 203 | fprintf(stderr, "\n");
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| 204 | }
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| 205 | #endif
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