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/*
* Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/pkcs12.h>
#include <openssl/bn.h>
/* Uncomment out this line to get debugging info about key generation */
/*
* #define OPENSSL_DEBUG_KEYGEN
*/
#ifdef OPENSSL_DEBUG_KEYGEN
# include <openssl/bio.h>
extern BIO *bio_err;
void h__dump(unsigned char *p, int len);
#endif
/* PKCS12 compatible key/IV generation */
#ifndef min
# define min(a,b) ((a) < (b) ? (a) : (b))
#endif
int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
int saltlen, int id, int iter, int n,
unsigned char *out, const EVP_MD *md_type)
{
int ret;
unsigned char *unipass;
int uniplen;
if (!pass) {
unipass = NULL;
uniplen = 0;
} else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
return 0;
}
ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
id, iter, n, out, md_type);
if (ret <= 0)
return 0;
OPENSSL_clear_free(unipass, uniplen);
return ret;
}
int PKCS12_key_gen_utf8(const char *pass, int passlen, unsigned char *salt,
int saltlen, int id, int iter, int n,
unsigned char *out, const EVP_MD *md_type)
{
int ret;
unsigned char *unipass;
int uniplen;
if (!pass) {
unipass = NULL;
uniplen = 0;
} else if (!OPENSSL_utf82uni(pass, passlen, &unipass, &uniplen)) {
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UTF8, ERR_R_MALLOC_FAILURE);
return 0;
}
ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
id, iter, n, out, md_type);
if (ret <= 0)
return 0;
OPENSSL_clear_free(unipass, uniplen);
return ret;
}
int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
int saltlen, int id, int iter, int n,
unsigned char *out, const EVP_MD *md_type)
{
unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
int Slen, Plen, Ilen, Ijlen;
int i, j, u, v;
int ret = 0;
BIGNUM *Ij = NULL, *Bpl1 = NULL; /* These hold Ij and B + 1 */
EVP_MD_CTX *ctx = NULL;
#ifdef OPENSSL_DEBUG_KEYGEN
unsigned char *tmpout = out;
int tmpn = n;
#endif
ctx = EVP_MD_CTX_new();
if (ctx == NULL)
goto err;
#ifdef OPENSSL_DEBUG_KEYGEN
fprintf(stderr, "KEYGEN DEBUG\n");
fprintf(stderr, "ID %d, ITER %d\n", id, iter);
fprintf(stderr, "Password (length %d):\n", passlen);
h__dump(pass, passlen);
fprintf(stderr, "Salt (length %d):\n", saltlen);
h__dump(salt, saltlen);
#endif
v = EVP_MD_block_size(md_type);
u = EVP_MD_size(md_type);
if (u < 0 || v <= 0)
goto err;
D = OPENSSL_malloc(v);
Ai = OPENSSL_malloc(u);
B = OPENSSL_malloc(v + 1);
Slen = v * ((saltlen + v - 1) / v);
if (passlen)
Plen = v * ((passlen + v - 1) / v);
else
Plen = 0;
Ilen = Slen + Plen;
I = OPENSSL_malloc(Ilen);
Ij = BN_new();
Bpl1 = BN_new();
if (D == NULL || Ai == NULL || B == NULL || I == NULL || Ij == NULL
|| Bpl1 == NULL)
goto err;
for (i = 0; i < v; i++)
D[i] = id;
p = I;
for (i = 0; i < Slen; i++)
*p++ = salt[i % saltlen];
for (i = 0; i < Plen; i++)
*p++ = pass[i % passlen];
for (;;) {
if (!EVP_DigestInit_ex(ctx, md_type, NULL)
|| !EVP_DigestUpdate(ctx, D, v)
|| !EVP_DigestUpdate(ctx, I, Ilen)
|| !EVP_DigestFinal_ex(ctx, Ai, NULL))
goto err;
for (j = 1; j < iter; j++) {
if (!EVP_DigestInit_ex(ctx, md_type, NULL)
|| !EVP_DigestUpdate(ctx, Ai, u)
|| !EVP_DigestFinal_ex(ctx, Ai, NULL))
goto err;
}
memcpy(out, Ai, min(n, u));
if (u >= n) {
#ifdef OPENSSL_DEBUG_KEYGEN
fprintf(stderr, "Output KEY (length %d)\n", tmpn);
h__dump(tmpout, tmpn);
#endif
ret = 1;
goto end;
}
n -= u;
out += u;
for (j = 0; j < v; j++)
B[j] = Ai[j % u];
/* Work out B + 1 first then can use B as tmp space */
if (!BN_bin2bn(B, v, Bpl1))
goto err;
if (!BN_add_word(Bpl1, 1))
goto err;
for (j = 0; j < Ilen; j += v) {
if (!BN_bin2bn(I + j, v, Ij))
goto err;
if (!BN_add(Ij, Ij, Bpl1))
goto err;
if (!BN_bn2bin(Ij, B))
goto err;
Ijlen = BN_num_bytes(Ij);
/* If more than 2^(v*8) - 1 cut off MSB */
if (Ijlen > v) {
if (!BN_bn2bin(Ij, B))
goto err;
memcpy(I + j, B + 1, v);
#ifndef PKCS12_BROKEN_KEYGEN
/* If less than v bytes pad with zeroes */
} else if (Ijlen < v) {
memset(I + j, 0, v - Ijlen);
if (!BN_bn2bin(Ij, I + j + v - Ijlen))
goto err;
#endif
} else if (!BN_bn2bin(Ij, I + j))
goto err;
}
}
err:
PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
end:
OPENSSL_free(Ai);
OPENSSL_free(B);
OPENSSL_free(D);
OPENSSL_free(I);
BN_free(Ij);
BN_free(Bpl1);
EVP_MD_CTX_free(ctx);
return ret;
}
#ifdef OPENSSL_DEBUG_KEYGEN
void h__dump(unsigned char *p, int len)
{
for (; len--; p++)
fprintf(stderr, "%02X", *p);
fprintf(stderr, "\n");
}
#endif
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