/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape security libraries.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1994-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#include "lowkeyi.h"
#include "secoid.h"
#include "secitem.h"
#include "secder.h"
#include "base64.h"
#include "secasn1.h"
#include "pcert.h"
#include "secerr.h"

#ifdef NSS_ENABLE_ECC
extern SECStatus EC_CopyParams(PRArenaPool *arena, 
			       ECParams *dstParams,
			       const ECParams *srcParams);
#endif

const SEC_ASN1Template nsslowkey_PQGParamsTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(PQGParams) },
    { SEC_ASN1_INTEGER, offsetof(PQGParams,prime) },
    { SEC_ASN1_INTEGER, offsetof(PQGParams,subPrime) },
    { SEC_ASN1_INTEGER, offsetof(PQGParams,base) },
    { 0, }
};

const SEC_ASN1Template nsslowkey_RSAPrivateKeyTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPrivateKey) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.version) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.modulus) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.publicExponent) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.privateExponent) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.prime1) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.prime2) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.exponent1) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.exponent2) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.rsa.coefficient) },
    { 0 }                                                                     
};                                                                            


const SEC_ASN1Template nsslowkey_DSAPrivateKeyTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPrivateKey) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dsa.publicValue) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dsa.privateValue) },
    { 0, }
};

const SEC_ASN1Template nsslowkey_DSAPrivateKeyExportTemplate[] = {
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dsa.privateValue) },
};

const SEC_ASN1Template nsslowkey_DHPrivateKeyTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPrivateKey) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dh.publicValue) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dh.privateValue) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dh.base) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.dh.prime) },
    { 0, }
};

#ifdef NSS_ENABLE_ECC

/* XXX This is just a placeholder for later when we support
 * generic curves and need full-blown support for parsing EC
 * parameters. For now, we only support named curves in which
 * EC params are simply encoded as an object ID and we don't
 * use nsslowkey_ECParamsTemplate.
 */
const SEC_ASN1Template nsslowkey_ECParamsTemplate[] = {
    { SEC_ASN1_CHOICE, offsetof(ECParams,type), NULL, sizeof(ECParams) },
    { SEC_ASN1_OBJECT_ID, offsetof(ECParams,curveOID), NULL, ec_params_named },
    { 0, }
};


/* NOTE: The SECG specification allows the private key structure
 * to contain curve parameters but recommends that they be stored
 * in the PrivateKeyAlgorithmIdentifier field of the PrivateKeyInfo
 * instead.
 */
const SEC_ASN1Template nsslowkey_ECPrivateKeyTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPrivateKey) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey,u.ec.version) },
    { SEC_ASN1_OCTET_STRING, 
      offsetof(NSSLOWKEYPrivateKey,u.ec.privateValue) },
    /* XXX The following template works for now since we only
     * support named curves for which the parameters are
     * encoded as an object ID. When we support generic curves,
     * we'll need to define nsslowkey_ECParamsTemplate
     */
#if 1
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED |
      SEC_ASN1_EXPLICIT | SEC_ASN1_CONTEXT_SPECIFIC | 0, 
      offsetof(NSSLOWKEYPrivateKey,u.ec.ecParams.curveOID), 
      SEC_ObjectIDTemplate }, 
#else
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED |
      SEC_ASN1_EXPLICIT | SEC_ASN1_CONTEXT_SPECIFIC | 0, 
      offsetof(NSSLOWKEYPrivateKey,u.ec.ecParams), 
      nsslowkey_ECParamsTemplate }, 
#endif
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED |
      SEC_ASN1_EXPLICIT | SEC_ASN1_CONTEXT_SPECIFIC | 1, 
      offsetof(NSSLOWKEYPrivateKey,u.ec.publicValue),
      SEC_BitStringTemplate }, 
    { 0, }
};
#endif /* NSS_ENABLE_ECC */
/*
 * See bugzilla bug 125359
 * Since NSS (via PKCS#11) wants to handle big integers as unsigned ints,
 * all of the templates above that en/decode into integers must be converted
 * from ASN.1's signed integer type.  This is done by marking either the
 * source or destination (encoding or decoding, respectively) type as
 * siUnsignedInteger.
 */

void
prepare_low_rsa_priv_key_for_asn1(NSSLOWKEYPrivateKey *key)
{
    key->u.rsa.modulus.type = siUnsignedInteger;
    key->u.rsa.publicExponent.type = siUnsignedInteger;
    key->u.rsa.privateExponent.type = siUnsignedInteger;
    key->u.rsa.prime1.type = siUnsignedInteger;
    key->u.rsa.prime2.type = siUnsignedInteger;
    key->u.rsa.exponent1.type = siUnsignedInteger;
    key->u.rsa.exponent2.type = siUnsignedInteger;
    key->u.rsa.coefficient.type = siUnsignedInteger;
}

void
prepare_low_pqg_params_for_asn1(PQGParams *params)
{
    params->prime.type = siUnsignedInteger;
    params->subPrime.type = siUnsignedInteger;
    params->base.type = siUnsignedInteger;
}

void
prepare_low_dsa_priv_key_for_asn1(NSSLOWKEYPrivateKey *key)
{
    key->u.dsa.publicValue.type = siUnsignedInteger;
    key->u.dsa.privateValue.type = siUnsignedInteger;
    key->u.dsa.params.prime.type = siUnsignedInteger;
    key->u.dsa.params.subPrime.type = siUnsignedInteger;
    key->u.dsa.params.base.type = siUnsignedInteger;
}

void
prepare_low_dsa_priv_key_export_for_asn1(NSSLOWKEYPrivateKey *key)
{
    key->u.dsa.privateValue.type = siUnsignedInteger;
}

void
prepare_low_dh_priv_key_for_asn1(NSSLOWKEYPrivateKey *key)
{
    key->u.dh.prime.type = siUnsignedInteger;
    key->u.dh.base.type = siUnsignedInteger;
    key->u.dh.publicValue.type = siUnsignedInteger;
    key->u.dh.privateValue.type = siUnsignedInteger;
}

#ifdef NSS_ENABLE_ECC
void
prepare_low_ecparams_for_asn1(ECParams *params)
{
    params->DEREncoding.type = siUnsignedInteger;
    params->curveOID.type = siUnsignedInteger;
}

void
prepare_low_ec_priv_key_for_asn1(NSSLOWKEYPrivateKey *key)
{
    key->u.ec.version.type = siUnsignedInteger;
    key->u.ec.ecParams.DEREncoding.type = siUnsignedInteger;
    key->u.ec.ecParams.curveOID.type = siUnsignedInteger;
    key->u.ec.privateValue.type = siUnsignedInteger;
    key->u.ec.publicValue.type = siUnsignedInteger;
}
#endif /* NSS_ENABLE_ECC */

void
nsslowkey_DestroyPrivateKey(NSSLOWKEYPrivateKey *privk)
{
    if (privk && privk->arena) {
	PORT_FreeArena(privk->arena, PR_TRUE);
    }
}

void
nsslowkey_DestroyPublicKey(NSSLOWKEYPublicKey *pubk)
{
    if (pubk && pubk->arena) {
	PORT_FreeArena(pubk->arena, PR_FALSE);
    }
}
unsigned
nsslowkey_PublicModulusLen(NSSLOWKEYPublicKey *pubk)
{
    unsigned char b0;

    /* interpret modulus length as key strength... in
     * fortezza that's the public key length */

    switch (pubk->keyType) {
    case NSSLOWKEYRSAKey:
    	b0 = pubk->u.rsa.modulus.data[0];
    	return b0 ? pubk->u.rsa.modulus.len : pubk->u.rsa.modulus.len - 1;
    default:
	break;
    }
    return 0;
}

unsigned
nsslowkey_PrivateModulusLen(NSSLOWKEYPrivateKey *privk)
{

    unsigned char b0;

    switch (privk->keyType) {
    case NSSLOWKEYRSAKey:
	b0 = privk->u.rsa.modulus.data[0];
	return b0 ? privk->u.rsa.modulus.len : privk->u.rsa.modulus.len - 1;
    default:
	break;
    }
    return 0;
}

NSSLOWKEYPublicKey *
nsslowkey_ConvertToPublicKey(NSSLOWKEYPrivateKey *privk)
{
    NSSLOWKEYPublicKey *pubk;
    PLArenaPool *arena;


    arena = PORT_NewArena (DER_DEFAULT_CHUNKSIZE);
    if (arena == NULL) {
        PORT_SetError (SEC_ERROR_NO_MEMORY);
        return NULL;
    }

    switch(privk->keyType) {
      case NSSLOWKEYRSAKey:
      case NSSLOWKEYNullKey:
	pubk = (NSSLOWKEYPublicKey *)PORT_ArenaZAlloc(arena,
						sizeof (NSSLOWKEYPublicKey));
	if (pubk != NULL) {
	    SECStatus rv;

	    pubk->arena = arena;
	    pubk->keyType = privk->keyType;
	    if (privk->keyType == NSSLOWKEYNullKey) return pubk;
	    rv = SECITEM_CopyItem(arena, &pubk->u.rsa.modulus,
				  &privk->u.rsa.modulus);
	    if (rv == SECSuccess) {
		rv = SECITEM_CopyItem (arena, &pubk->u.rsa.publicExponent,
				       &privk->u.rsa.publicExponent);
		if (rv == SECSuccess)
		    return pubk;
	    }
	} else {
	    PORT_SetError (SEC_ERROR_NO_MEMORY);
	}
	break;
      case NSSLOWKEYDSAKey:
	pubk = (NSSLOWKEYPublicKey *)PORT_ArenaZAlloc(arena,
						    sizeof(NSSLOWKEYPublicKey));
	if (pubk != NULL) {
	    SECStatus rv;

	    pubk->arena = arena;
	    pubk->keyType = privk->keyType;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dsa.publicValue,
				  &privk->u.dsa.publicValue);
	    if (rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dsa.params.prime,
				  &privk->u.dsa.params.prime);
	    if (rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dsa.params.subPrime,
				  &privk->u.dsa.params.subPrime);
	    if (rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dsa.params.base,
				  &privk->u.dsa.params.base);
	    if (rv == SECSuccess) return pubk;
	}
	break;
      case NSSLOWKEYDHKey:
	pubk = (NSSLOWKEYPublicKey *)PORT_ArenaZAlloc(arena,
						    sizeof(NSSLOWKEYPublicKey));
	if (pubk != NULL) {
	    SECStatus rv;

	    pubk->arena = arena;
	    pubk->keyType = privk->keyType;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dh.publicValue,
				  &privk->u.dh.publicValue);
	    if (rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dh.prime,
				  &privk->u.dh.prime);
	    if (rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(arena, &pubk->u.dh.base,
				  &privk->u.dh.base);
	    if (rv == SECSuccess) return pubk;
	}
	break;
#ifdef NSS_ENABLE_ECC
      case NSSLOWKEYECKey:
	pubk = (NSSLOWKEYPublicKey *)PORT_ArenaZAlloc(arena,
						    sizeof(NSSLOWKEYPublicKey));
	if (pubk != NULL) {
	    SECStatus rv;

	    pubk->arena = arena;
	    pubk->keyType = privk->keyType;
	    rv = SECITEM_CopyItem(arena, &pubk->u.ec.publicValue,
				  &privk->u.ec.publicValue);
	    if (rv != SECSuccess) break;
	    pubk->u.ec.ecParams.arena = arena;
	    /* Copy the rest of the params */
	    rv = EC_CopyParams(arena, &(pubk->u.ec.ecParams),
			       &(privk->u.ec.ecParams));
	    if (rv == SECSuccess) return pubk;
	}
	break;
#endif /* NSS_ENABLE_ECC */
	/* No Fortezza in Low Key implementations (Fortezza keys aren't
	 * stored in our data base */
    default:
	break;
    }

    PORT_FreeArena (arena, PR_FALSE);
    return NULL;
}

NSSLOWKEYPrivateKey *
nsslowkey_CopyPrivateKey(NSSLOWKEYPrivateKey *privKey)
{
    NSSLOWKEYPrivateKey *returnKey = NULL;
    SECStatus rv = SECFailure;
    PLArenaPool *poolp;

    if(!privKey) {
	return NULL;
    }

    poolp = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
    if(!poolp) {
	return NULL;
    }

    returnKey = (NSSLOWKEYPrivateKey*)PORT_ArenaZAlloc(poolp, sizeof(NSSLOWKEYPrivateKey));
    if(!returnKey) {
	rv = SECFailure;
	goto loser;
    }

    returnKey->keyType = privKey->keyType;
    returnKey->arena = poolp;

    switch(privKey->keyType) {
	case NSSLOWKEYRSAKey:
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.modulus), 
	    				&(privKey->u.rsa.modulus));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.version), 
	    				&(privKey->u.rsa.version));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.publicExponent), 
	    				&(privKey->u.rsa.publicExponent));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.privateExponent), 
	    				&(privKey->u.rsa.privateExponent));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.prime1), 
	    				&(privKey->u.rsa.prime1));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.prime2), 
	    				&(privKey->u.rsa.prime2));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.exponent1), 
	    				&(privKey->u.rsa.exponent1));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.exponent2), 
	    				&(privKey->u.rsa.exponent2));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.rsa.coefficient), 
	    				&(privKey->u.rsa.coefficient));
	    if(rv != SECSuccess) break;
	    break;
	case NSSLOWKEYDSAKey:
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dsa.publicValue),
	    				&(privKey->u.dsa.publicValue));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dsa.privateValue),
	    				&(privKey->u.dsa.privateValue));
	    if(rv != SECSuccess) break;
	    returnKey->u.dsa.params.arena = poolp;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dsa.params.prime),
					&(privKey->u.dsa.params.prime));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dsa.params.subPrime),
					&(privKey->u.dsa.params.subPrime));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dsa.params.base),
					&(privKey->u.dsa.params.base));
	    if(rv != SECSuccess) break;
	    break;
	case NSSLOWKEYDHKey:
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dh.publicValue),
	    				&(privKey->u.dh.publicValue));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dh.privateValue),
	    				&(privKey->u.dh.privateValue));
	    if(rv != SECSuccess) break;
	    returnKey->u.dsa.params.arena = poolp;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dh.prime),
					&(privKey->u.dh.prime));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.dh.base),
					&(privKey->u.dh.base));
	    if(rv != SECSuccess) break;
	    break;
#ifdef NSS_ENABLE_ECC
	case NSSLOWKEYECKey:
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.ec.version),
	    				&(privKey->u.ec.version));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.ec.publicValue),
	    				&(privKey->u.ec.publicValue));
	    if(rv != SECSuccess) break;
	    rv = SECITEM_CopyItem(poolp, &(returnKey->u.ec.privateValue),
	    				&(privKey->u.ec.privateValue));
	    if(rv != SECSuccess) break;
	    returnKey->u.ec.ecParams.arena = poolp;
	    /* Copy the rest of the params */
	    rv = EC_CopyParams(poolp, &(returnKey->u.ec.ecParams),
			       &(privKey->u.ec.ecParams));
	    if (rv != SECSuccess) break;
	    break;
#endif /* NSS_ENABLE_ECC */
	default:
	    rv = SECFailure;
    }

loser:

    if(rv != SECSuccess) {
	PORT_FreeArena(poolp, PR_TRUE);
	returnKey = NULL;
    }

    return returnKey;
}