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openssl/crypto/pem/pvkfmt.c

Index: openssl/crypto/pem/pvkfmt.c
===================================================================
--- openssl/crypto/pem/pvkfmt.c	(revision 0)
+++ openssl/crypto/pem/pvkfmt.c	(revision 0)
@@ -0,0 +1,938 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+/* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
+ * and PRIVATEKEYBLOB).
+ */
+
+#include "cryptlib.h"
+#include <openssl/pem.h>
+#include <openssl/rand.h>
+#include <openssl/bn.h>
+#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
+#include <openssl/dsa.h>
+#include <openssl/rsa.h>
+
+/* Utility function: read a DWORD (4 byte unsigned integer) in little endian
+ * format
+ */
+
+static unsigned int read_ledword(const unsigned char **in)
+	{
+	const unsigned char *p = *in;
+	unsigned int ret;
+	ret = *p++;
+	ret |= (*p++ << 8);
+	ret |= (*p++ << 16);
+	ret |= (*p++ << 24);
+	*in = p;
+	return ret;
+	}
+
+/* Read a BIGNUM in little endian format. The docs say that this should take up 
+ * bitlen/8 bytes.
+ */
+
+static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
+	{
+	const unsigned char *p;
+	unsigned char *tmpbuf, *q;
+	unsigned int i;
+	p = *in + nbyte - 1;
+	tmpbuf = OPENSSL_malloc(nbyte);
+	if (!tmpbuf)
+		return 0;
+	q = tmpbuf;
+	for (i = 0; i < nbyte; i++)
+		*q++ = *p--;
+	*r = BN_bin2bn(tmpbuf, nbyte, NULL);
+	OPENSSL_free(tmpbuf);
+	if (*r)
+		{
+		*in += nbyte;
+		return 1;
+		}
+	else
+		return 0;
+	}
+
+
+/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
+
+#define MS_PUBLICKEYBLOB	0x6
+#define MS_PRIVATEKEYBLOB	0x7
+#define MS_RSA1MAGIC		0x31415352L
+#define MS_RSA2MAGIC		0x32415352L
+#define MS_DSS1MAGIC		0x31535344L
+#define MS_DSS2MAGIC		0x32535344L
+
+#define MS_KEYALG_RSA_KEYX	0xa400
+#define MS_KEYALG_DSS_SIGN	0x2200
+
+#define MS_KEYTYPE_KEYX		0x1
+#define MS_KEYTYPE_SIGN		0x2
+
+/* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
+#define MS_PVKMAGIC		0xb0b5f11eL
+/* Salt length for PVK files */
+#define PVK_SALTLEN		0x10
+
+static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
+						unsigned int bitlen, int ispub);
+static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
+						unsigned int bitlen, int ispub);
+
+static int do_blob_header(const unsigned char **in, unsigned int length,
+				unsigned int *pmagic, unsigned int *pbitlen,
+				int *pisdss, int *pispub)
+	{
+	const unsigned char *p = *in;
+	if (length < 16)
+		return 0;
+	/* bType */
+	if (*p == MS_PUBLICKEYBLOB)
+		{
+		if (*pispub == 0)
+			{
+			PEMerr(PEM_F_DO_BLOB_HEADER,
+					PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
+			return 0;
+			}
+		*pispub = 1;
+		}
+	else if (*p == MS_PRIVATEKEYBLOB)
+		{
+		if (*pispub == 1)
+			{
+			PEMerr(PEM_F_DO_BLOB_HEADER,
+					PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
+			return 0;
+			}
+		*pispub = 0;
+		}
+	else
+		return 0;
+	p++;
+	/* Version */
+	if (*p++ != 0x2)
+		{
+		PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
+		return 0;
+		}
+	/* Ignore reserved, aiKeyAlg */
+	p+= 6;
+	*pmagic = read_ledword(&p);
+	*pbitlen = read_ledword(&p);
+	*pisdss = 0;
+	switch (*pmagic)
+		{
+
+		case MS_DSS1MAGIC:
+		*pisdss = 1;
+		case MS_RSA1MAGIC:
+		if (*pispub == 0)
+			{
+			PEMerr(PEM_F_DO_BLOB_HEADER,
+					PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
+			return 0;
+			}
+		break;
+
+		case MS_DSS2MAGIC:
+		*pisdss = 1;
+		case MS_RSA2MAGIC:
+		if (*pispub == 1)
+			{
+			PEMerr(PEM_F_DO_BLOB_HEADER,
+					PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
+			return 0;
+			}
+		break;
+
+		default:
+		PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER);
+		return -1;
+		}
+	*in = p;
+	return 1;
+	}
+
+static unsigned int blob_length(unsigned bitlen, int isdss, int ispub)
+	{
+	unsigned int nbyte, hnbyte;
+	nbyte = (bitlen + 7) >> 3;
+	hnbyte = (bitlen + 15) >> 4;
+	if (isdss)
+		{
+
+		/* Expected length: 20 for q + 3 components bitlen each + 24
+		 * for seed structure.
+		 */
+		if (ispub)
+			return  44 + 3 * nbyte;
+		/* Expected length: 20 for q, priv, 2 bitlen components + 24
+		 * for seed structure.
+		 */
+		else
+			return 64 + 2 * nbyte;
+		}
+	else
+		{
+		/* Expected length: 4 for 'e' + 'n' */
+		if (ispub)
+			return 4 + nbyte;
+		else
+		/* Expected length: 4 for 'e' and 7 other components.
+		 * 2 components are bitlen size, 5 are bitlen/2
+		 */
+			return 4 + 2*nbyte + 5*hnbyte;
+		}
+
+	}
+
+static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length,
+								int ispub)
+	{
+	const unsigned char *p = *in;
+	unsigned int bitlen, magic;
+	int isdss;
+	if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0)
+		{
+		PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
+		return NULL;
+		}
+	length -= 16;
+	if (length < blob_length(bitlen, isdss, ispub))
+		{
+		PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT);
+		return NULL;
+		}
+	if (isdss)
+		return b2i_dss(&p, length, bitlen, ispub);
+	else
+		return b2i_rsa(&p, length, bitlen, ispub);
+	}
+
+static EVP_PKEY *do_b2i_bio(BIO *in, int ispub)
+	{
+	const unsigned char *p;
+	unsigned char hdr_buf[16], *buf = NULL;
+	unsigned int bitlen, magic, length;
+	int isdss;
+	EVP_PKEY *ret = NULL;
+	if (BIO_read(in, hdr_buf, 16) != 16)
+		{
+		PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
+		return NULL;
+		}
+	p = hdr_buf;
+	if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
+		return NULL;
+
+	length = blob_length(bitlen, isdss, ispub);
+	buf = OPENSSL_malloc(length);
+	if (!buf)
+		{
+		PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+	p = buf;
+	if (BIO_read(in, buf, length) != (int)length)
+		{
+		PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
+		goto err;
+		}
+
+	if (isdss)
+		ret = b2i_dss(&p, length, bitlen, ispub);
+	else
+		ret = b2i_rsa(&p, length, bitlen, ispub);
+
+	err:
+	if (buf)
+		OPENSSL_free(buf);
+	return ret;
+	}
+
+static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
+						unsigned int bitlen, int ispub)
+	{
+	const unsigned char *p = *in;
+	EVP_PKEY *ret = NULL;
+	DSA *dsa = NULL;
+	BN_CTX *ctx = NULL;
+	unsigned int nbyte;
+	nbyte = (bitlen + 7) >> 3;
+
+	dsa = DSA_new();
+	ret = EVP_PKEY_new();
+	if (!dsa || !ret)
+		goto memerr;
+	if (!read_lebn(&p, nbyte, &dsa->p))
+		goto memerr;
+	if (!read_lebn(&p, 20, &dsa->q))
+		goto memerr;
+	if (!read_lebn(&p, nbyte, &dsa->g))
+		goto memerr;
+	if (ispub)
+		{
+		if (!read_lebn(&p, nbyte, &dsa->pub_key))
+			goto memerr;
+		}
+	else
+		{
+		if (!read_lebn(&p, 20, &dsa->priv_key))
+			goto memerr;
+		/* Calculate public key */
+		if (!(dsa->pub_key = BN_new()))
+			goto memerr;
+		if (!(ctx = BN_CTX_new()))
+			goto memerr;
+			
+		if (!BN_mod_exp(dsa->pub_key, dsa->g,
+						 dsa->priv_key, dsa->p, ctx))
+			
+			goto memerr;
+		BN_CTX_free(ctx);
+		}
+
+	EVP_PKEY_set1_DSA(ret, dsa);
+	DSA_free(dsa);
+	*in = p;
+	return ret;
+
+	memerr:
+	PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
+	if (dsa)
+		DSA_free(dsa);
+	if (ret)
+		EVP_PKEY_free(ret);
+	if (ctx)
+		BN_CTX_free(ctx);
+	return NULL;
+	}
+
+static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
+						unsigned int bitlen, int ispub)
+		
+	{
+	const unsigned char *p = *in;
+	EVP_PKEY *ret = NULL;
+	RSA *rsa = NULL;
+	unsigned int nbyte, hnbyte;
+	nbyte = (bitlen + 7) >> 3;
+	hnbyte = (bitlen + 15) >> 4;
+	rsa = RSA_new();
+	ret = EVP_PKEY_new();
+	if (!rsa || !ret)
+		goto memerr;
+	rsa->e = BN_new();
+	if (!rsa->e)
+		goto memerr;
+	if (!BN_set_word(rsa->e, read_ledword(&p)))
+		goto memerr;
+	if (!read_lebn(&p, nbyte, &rsa->n))
+		goto memerr;
+	if (!ispub)
+		{
+		if (!read_lebn(&p, hnbyte, &rsa->p))
+			goto memerr;
+		if (!read_lebn(&p, hnbyte, &rsa->q))
+			goto memerr;
+		if (!read_lebn(&p, hnbyte, &rsa->dmp1))
+			goto memerr;
+		if (!read_lebn(&p, hnbyte, &rsa->dmq1))
+			goto memerr;
+		if (!read_lebn(&p, hnbyte, &rsa->iqmp))
+			goto memerr;
+		if (!read_lebn(&p, nbyte, &rsa->d))
+			goto memerr;
+		}
+
+	EVP_PKEY_set1_RSA(ret, rsa);
+	RSA_free(rsa);
+	*in = p;
+	return ret;
+	memerr:
+	PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
+	if (rsa)
+		RSA_free(rsa);
+	if (ret)
+		EVP_PKEY_free(ret);
+	return NULL;
+	}
+
+EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
+	{
+	return do_b2i(in, length, 0);
+	}
+
+EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
+	{
+	return do_b2i(in, length, 1);
+	}
+
+
+EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
+	{
+	return do_b2i_bio(in, 0);
+	}
+
+EVP_PKEY *b2i_PublicKey_bio(BIO *in)
+	{
+	return do_b2i_bio(in, 1);
+	}
+
+static void write_ledword(unsigned char **out, unsigned int dw)
+	{
+	unsigned char *p = *out;
+	*p++ = dw & 0xff;
+	*p++ = (dw>>8) & 0xff;
+	*p++ = (dw>>16) & 0xff;
+	*p++ = (dw>>24) & 0xff;
+	*out = p;
+	}
+
+static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
+	{
+	int nb, i;
+	unsigned char *p = *out, *q, c;
+	nb = BN_num_bytes(bn);
+	BN_bn2bin(bn, p);
+	q = p + nb - 1;
+	/* In place byte order reversal */
+	for (i = 0; i < nb/2; i++)
+		{
+		c = *p;
+		*p++ = *q;
+		*q-- = c;
+		}
+	*out += nb;
+	/* Pad with zeroes if we have to */
+	if (len > 0)
+		{
+		len -= nb;
+		if (len > 0)
+			{
+			memset(*out, 0, len);
+			*out += len;
+			}
+		}
+	}
+
+
+static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
+static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
+
+static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
+static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
+	
+static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
+	{
+	unsigned char *p;
+	unsigned int bitlen, magic = 0, keyalg;
+	int outlen, noinc = 0;
+	if (pk->type == EVP_PKEY_DSA)
+		{
+		bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
+		keyalg = MS_KEYALG_DSS_SIGN;
+		}
+	else if (pk->type == EVP_PKEY_RSA)
+		{
+		bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
+		keyalg = MS_KEYALG_RSA_KEYX;
+		}
+	else
+		return -1;
+	if (bitlen == 0)
+		return -1;
+	outlen = 16 + blob_length(bitlen,
+			keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
+	if (out == NULL)
+		return outlen;
+	if (*out)
+		p = *out;
+	else
+		{
+		p = OPENSSL_malloc(outlen);
+		if (!p)
+			return -1;
+		*out = p;
+		noinc = 1;
+		}
+	if (ispub)
+		*p++ = MS_PUBLICKEYBLOB;
+	else
+		*p++ = MS_PRIVATEKEYBLOB;
+	*p++ = 0x2;
+	*p++ = 0;
+	*p++ = 0;
+	write_ledword(&p, keyalg);
+	write_ledword(&p, magic);
+	write_ledword(&p, bitlen);
+	if (keyalg == MS_KEYALG_DSS_SIGN)
+		write_dsa(&p, pk->pkey.dsa, ispub);
+	else
+		write_rsa(&p, pk->pkey.rsa, ispub);
+	if (!noinc)
+		*out += outlen;
+	return outlen;
+	}
+
+static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
+	{
+	unsigned char *tmp = NULL;
+	int outlen, wrlen;
+	outlen = do_i2b(&tmp, pk, ispub);
+	if (outlen < 0)
+		return -1;
+	wrlen = BIO_write(out, tmp, outlen);
+	OPENSSL_free(tmp);
+	if (wrlen == outlen)
+		return outlen;
+	return -1;
+	}
+
+static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
+	{
+	int bitlen;
+	bitlen = BN_num_bits(dsa->p);
+	if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160)
+		|| (BN_num_bits(dsa->g) > bitlen))
+		goto badkey;
+	if (ispub)
+		{
+		if (BN_num_bits(dsa->pub_key) > bitlen)
+			goto badkey;
+		*pmagic = MS_DSS1MAGIC;
+		}
+	else
+		{
+		if (BN_num_bits(dsa->priv_key) > 160)
+			goto badkey;
+		*pmagic = MS_DSS2MAGIC;
+		}
+	
+	return bitlen;
+	badkey:
+	PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
+	return 0;
+	}
+
+static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
+	{
+	int nbyte, hnbyte, bitlen;
+	if (BN_num_bits(rsa->e) > 32)
+		goto badkey;
+	bitlen = BN_num_bits(rsa->n);
+	nbyte = BN_num_bytes(rsa->n);
+	hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
+	if (ispub)
+		{
+		*pmagic = MS_RSA1MAGIC;
+		return bitlen;
+		}
+	else
+	{
+		*pmagic = MS_RSA2MAGIC;
+		/* For private key each component must fit within nbyte or
+		 * hnbyte.
+		 */
+		if (BN_num_bytes(rsa->d) > nbyte)
+			goto badkey;
+		if ((BN_num_bytes(rsa->iqmp) > hnbyte)
+			|| (BN_num_bytes(rsa->p) > hnbyte)
+			|| (BN_num_bytes(rsa->q) > hnbyte)
+			|| (BN_num_bytes(rsa->dmp1) > hnbyte)
+			|| (BN_num_bytes(rsa->dmq1) > hnbyte))
+			goto badkey;
+	}
+	return bitlen;
+	badkey:
+	PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
+	return 0;
+	}
+
+
+static void write_rsa(unsigned char **out, RSA *rsa, int ispub)
+	{
+	int nbyte, hnbyte;
+	nbyte = BN_num_bytes(rsa->n);
+	hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
+	write_lebn(out, rsa->e, 4);
+	write_lebn(out, rsa->n, -1);
+	if (ispub)
+		return;
+	write_lebn(out, rsa->p, hnbyte);
+	write_lebn(out, rsa->q, hnbyte);
+	write_lebn(out, rsa->dmp1, hnbyte);
+	write_lebn(out, rsa->dmq1, hnbyte);
+	write_lebn(out, rsa->iqmp, hnbyte);
+	write_lebn(out, rsa->d, nbyte);
+	}
+
+	
+static void write_dsa(unsigned char **out, DSA *dsa, int ispub)
+	{
+	int nbyte;
+	nbyte = BN_num_bytes(dsa->p);
+	write_lebn(out, dsa->p, nbyte);
+	write_lebn(out, dsa->q, 20);
+	write_lebn(out, dsa->g, nbyte);
+	if (ispub)
+		write_lebn(out, dsa->pub_key, nbyte);
+	else
+		write_lebn(out, dsa->priv_key, 20);
+	/* Set "invalid" for seed structure values */
+	memset(*out, 0xff, 24);
+	*out += 24;
+	return;
+	}
+	
+
+int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
+	{
+	return do_i2b_bio(out, pk, 0);
+	}
+
+int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
+	{
+	return do_i2b_bio(out, pk, 1);
+	}
+
+#ifndef OPENSSL_NO_RC4
+
+static int do_PVK_header(const unsigned char **in, unsigned int length,
+		int skip_magic,
+	       	unsigned int *psaltlen, unsigned int *pkeylen)
+		
+	{
+	const unsigned char *p = *in;
+	unsigned int pvk_magic, is_encrypted;
+	if (skip_magic)
+		{
+		if (length < 20)
+			{
+			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
+			return 0;
+			}
+		length -= 20;
+		}
+	else
+		{
+		if (length < 24)
+			{
+			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
+			return 0;
+			}
+		length -= 24;
+		pvk_magic = read_ledword(&p);
+		if (pvk_magic != MS_PVKMAGIC)
+			{
+			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER);
+			return 0;
+			}
+		}
+	/* Skip reserved */
+	p += 4;
+	/*keytype = */read_ledword(&p);
+	is_encrypted = read_ledword(&p);
+	*psaltlen = read_ledword(&p);
+	*pkeylen = read_ledword(&p);
+
+	if (is_encrypted && !*psaltlen)
+		{
+		PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER);
+		return 0;
+		}
+
+	*in = p;
+	return 1;
+	}
+
+static int derive_pvk_key(unsigned char *key, 
+			const unsigned char *salt, unsigned int saltlen,
+			const unsigned char *pass, int passlen)
+	{
+	EVP_MD_CTX mctx;
+	EVP_MD_CTX_init(&mctx);
+	EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL);
+	EVP_DigestUpdate(&mctx, salt, saltlen);
+	EVP_DigestUpdate(&mctx, pass, passlen);
+	EVP_DigestFinal_ex(&mctx, key, NULL);
+	EVP_MD_CTX_cleanup(&mctx);
+	return 1;
+	}
+	
+
+static EVP_PKEY *do_PVK_body(const unsigned char **in,
+		unsigned int saltlen, unsigned int keylen,
+		pem_password_cb *cb, void *u)
+	{
+	EVP_PKEY *ret = NULL;
+	const unsigned char *p = *in;
+	unsigned int magic;
+	unsigned char *enctmp = NULL, *q;
+	if (saltlen)
+		{
+		char psbuf[PEM_BUFSIZE];
+		unsigned char keybuf[20];
+		EVP_CIPHER_CTX cctx;
+		int enctmplen, inlen;
+		if (cb)
+			inlen=cb(psbuf,PEM_BUFSIZE,0,u);
+		else
+			inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,0,u);
+		if (inlen <= 0)
+			{
+			PEMerr(PEM_F_DO_PVK_BODY,PEM_R_BAD_PASSWORD_READ);
+			return NULL;
+			}
+		enctmp = OPENSSL_malloc(keylen + 8);
+		if (!enctmp)
+			{
+			PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
+			return NULL;
+			}
+		if (!derive_pvk_key(keybuf, p, saltlen,
+			    (unsigned char *)psbuf, inlen))
+			return NULL;
+		p += saltlen;
+		/* Copy BLOBHEADER across, decrypt rest */
+		memcpy(enctmp, p, 8);
+		p += 8;
+		inlen = keylen - 8;
+		q = enctmp + 8;
+		EVP_CIPHER_CTX_init(&cctx);
+		EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL);
+		EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen);
+		EVP_DecryptFinal_ex(&cctx, q + enctmplen, &enctmplen);
+		magic = read_ledword((const unsigned char **)&q);
+		if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
+			{
+			q = enctmp + 8;
+			memset(keybuf + 5, 0, 11);
+			EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf,
+								NULL);
+			OPENSSL_cleanse(keybuf, 20);
+			EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen);
+			EVP_DecryptFinal_ex(&cctx, q + enctmplen,
+								&enctmplen);
+			magic = read_ledword((const unsigned char **)&q);
+			if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
+				{
+				EVP_CIPHER_CTX_cleanup(&cctx);
+				PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
+				goto err;
+				}
+			}
+		else
+			OPENSSL_cleanse(keybuf, 20);
+		EVP_CIPHER_CTX_cleanup(&cctx);
+		p = enctmp;
+		}
+
+	ret = b2i_PrivateKey(&p, keylen);
+	err:
+	if (enctmp && saltlen)
+		OPENSSL_free(enctmp);
+	return ret;
+	}
+
+
+EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
+	{
+	unsigned char pvk_hdr[24], *buf = NULL;
+	const unsigned char *p;
+	int buflen;
+	EVP_PKEY *ret = NULL;
+	unsigned int saltlen, keylen;
+	if (BIO_read(in, pvk_hdr, 24) != 24)
+		{
+		PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
+		return NULL;
+		}
+	p = pvk_hdr;
+
+	if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
+		return 0;
+	buflen = (int) keylen + saltlen;
+	buf = OPENSSL_malloc(buflen);
+	if (!buf)
+		{
+		PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
+		return 0;
+		}
+	p = buf;
+	if (BIO_read(in, buf, buflen) != buflen)
+		{
+		PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
+		goto err;
+		}
+	ret = do_PVK_body(&p, saltlen, keylen, cb, u);
+
+	err:
+	if (buf)
+		{
+		OPENSSL_cleanse(buf, buflen);
+		OPENSSL_free(buf);
+		}
+	return ret;
+	}
+
+	
+	
+static int i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel,
+		pem_password_cb *cb, void *u)
+	{
+	int outlen = 24, pklen;
+	unsigned char *p, *salt = NULL;
+	if (enclevel)
+		outlen += PVK_SALTLEN;
+	pklen = do_i2b(NULL, pk, 0);
+	if (pklen < 0)
+		return -1;
+	outlen += pklen;
+	if (!out)
+		return outlen;
+	if (*out)
+		p = *out;
+	else
+		{
+		p = OPENSSL_malloc(outlen);
+		if (!p)
+			{
+			PEMerr(PEM_F_I2B_PVK,ERR_R_MALLOC_FAILURE);
+			return -1;
+			}
+		*out = p;
+		}
+
+	write_ledword(&p, MS_PVKMAGIC);
+	write_ledword(&p, 0);
+	if (pk->type == EVP_PKEY_DSA)
+		write_ledword(&p, MS_KEYTYPE_SIGN);
+	else
+		write_ledword(&p, MS_KEYTYPE_KEYX);
+	write_ledword(&p, enclevel ? 1 : 0);
+	write_ledword(&p, enclevel ? PVK_SALTLEN: 0);
+	write_ledword(&p, pklen);
+	if (enclevel)
+		{
+		if (RAND_bytes(p, PVK_SALTLEN) <= 0)
+			goto error;
+		salt = p;
+		p += PVK_SALTLEN;
+		}
+	do_i2b(&p, pk, 0);
+	if (enclevel == 0)
+		return outlen;
+	else
+		{
+		char psbuf[PEM_BUFSIZE];
+		unsigned char keybuf[20];
+		EVP_CIPHER_CTX cctx;
+		int enctmplen, inlen;
+		if (cb)
+			inlen=cb(psbuf,PEM_BUFSIZE,1,u);
+		else
+			inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,1,u);
+		if (inlen <= 0)
+			{
+			PEMerr(PEM_F_I2B_PVK,PEM_R_BAD_PASSWORD_READ);
+			goto error;
+			}
+		if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
+			    (unsigned char *)psbuf, inlen))
+			goto error;
+		if (enclevel == 1)
+			memset(keybuf + 5, 0, 11);
+		p = salt + PVK_SALTLEN + 8;
+		EVP_CIPHER_CTX_init(&cctx);
+		EVP_EncryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL);
+		OPENSSL_cleanse(keybuf, 20);
+		EVP_DecryptUpdate(&cctx, p, &enctmplen, p, pklen - 8);
+		EVP_DecryptFinal_ex(&cctx, p + enctmplen, &enctmplen);
+		EVP_CIPHER_CTX_cleanup(&cctx);
+		}
+	return outlen;
+
+	error:
+	return -1;
+	}
+
+int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel,
+		pem_password_cb *cb, void *u)
+	{
+	unsigned char *tmp = NULL;
+	int outlen, wrlen;
+	outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
+	if (outlen < 0)
+		return -1;
+	wrlen = BIO_write(out, tmp, outlen);
+	OPENSSL_free(tmp);
+	if (wrlen == outlen)
+		{
+		PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);
+		return outlen;
+		}
+	return -1;
+	}
+
+#endif
+
+#endif