Quelle  lowkey.c   Sprache: C

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "lowkeyi.h"
#include "secoid.h"
#include "secitem.h"
#include "secder.h"
#include "secasn1.h"
#include "secerr.h"

SEC_ASN1_MKSUB(SEC_AnyTemplate)
SEC_ASN1_MKSUB(SEC_BitStringTemplate)
SEC_ASN1_MKSUB(SEC_ObjectIDTemplate)
SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)

static const SEC_ASN1Template nsslowkey_AttributeTemplate[] = {
    { SEC_ASN1_SEQUENCE,
      0, NULL, sizeof(NSSLOWKEYAttribute) },
    { SEC_ASN1_OBJECT_ID, offsetof(NSSLOWKEYAttribute, attrType) },
    { SEC_ASN1_SET_OF | SEC_ASN1_XTRN, offsetof(NSSLOWKEYAttribute, attrValue),
      SEC_ASN1_SUB(SEC_AnyTemplate) },
    { 0 }
};

static const SEC_ASN1Template nsslowkey_SetOfAttributeTemplate[] = {
    { SEC_ASN1_SET_OF, 0, nsslowkey_AttributeTemplate },
};
/* ASN1 Templates for new decoder/encoder */
const SEC_ASN1Template lg_nsslowkey_PrivateKeyInfoTemplate[] = {
    { SEC_ASN1_SEQUENCE,
      0, NULL, sizeof(NSSLOWKEYPrivateKeyInfo) },
    { SEC_ASN1_INTEGER,
      offsetof(NSSLOWKEYPrivateKeyInfo, version) },
    { SEC_ASN1_INLINE | SEC_ASN1_XTRN,
      offsetof(NSSLOWKEYPrivateKeyInfo, algorithm),
      SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
    { SEC_ASN1_OCTET_STRING,
      offsetof(NSSLOWKEYPrivateKeyInfo, privateKey) },
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC | 0,
      offsetof(NSSLOWKEYPrivateKeyInfo, attributes),
      nsslowkey_SetOfAttributeTemplate },
    { 0 }
};

const SEC_ASN1Template lg_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 lg_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 }
};

/*
 * Allows u.rsa.modulus to be zero length for secret keys with an empty
 * CKA_ID incorrectly generated in NSS 3.13.3 or earlier.  Only used for
 * decoding.  See bug 715073.
 */
const SEC_ASN1Template lg_nsslowkey_RSAPrivateKeyTemplate2[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPrivateKey) },
    { SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPrivateKey, u.rsa.version) },
    { SEC_ASN1_ANY, 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 lg_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 lg_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 }
};

/* 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 lg_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) },
    /* We only support named curves for which the parameters are
     * encoded as an object ID.
     */
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED |
          SEC_ASN1_EXPLICIT | SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_XTRN | 0,
      offsetof(NSSLOWKEYPrivateKey, u.ec.ecParams.curveOID),
      SEC_ASN1_SUB(SEC_ObjectIDTemplate) },
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED |
          SEC_ASN1_EXPLICIT | SEC_ASN1_CONTEXT_SPECIFIC |
          SEC_ASN1_XTRN | 1,
      offsetof(NSSLOWKEYPrivateKey, u.ec.publicValue),
      SEC_ASN1_SUB(SEC_BitStringTemplate) },
    { 0 }
};

/*
 * smaller version of EC_FillParams. In this code, we only need
 * oid and DER data.
 */
SECStatus
LGEC_FillParams(PLArenaPool *arena, const SECItem *encodedParams,
                ECParams *params)
{
    SECOidTag tag;
    SECItem oid = { siBuffer, NULL, 0 };

#if EC_DEBUG
    int i;

    printf("Encoded params in EC_DecodeParams: ");
    for (i = 0; i < encodedParams->len; i++) {
        printf("%02x:", encodedParams->data[i]);
    }
    printf("\n");
#endif

    oid.len = encodedParams->len - 2;
    oid.data = encodedParams->data + 2;
    if ((encodedParams->data[0] != SEC_ASN1_OBJECT_ID) ||
        ((tag = SECOID_FindOIDTag(&oid)) == SEC_OID_UNKNOWN)) {
        PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
        return SECFailure;
    }

    params->arena = arena;

    /* For named curves, fill out curveOID */
    params->curveOID.len = oid.len;
    params->curveOID.data = (unsigned char *)PORT_ArenaAlloc(arena, oid.len);
    if (params->curveOID.data == NULL) {
        return SECFailure;
    }
    memcpy(params->curveOID.data, oid.data, oid.len);

    return SECSuccess;
}

/* Copy all of the fields from srcParams into dstParams
 */
SECStatus
LGEC_CopyParams(PLArenaPool *arena, ECParams *dstParams,
                const ECParams *srcParams)
{
    SECStatus rv = SECFailure;

    dstParams->arena = arena;
    rv = SECITEM_CopyItem(arena, &dstParams->DEREncoding,
                          &srcParams->DEREncoding);
    if (rv != SECSuccess) {
        goto loser;
    }
    rv = SECITEM_CopyItem(arena, &dstParams->curveOID,
                          &srcParams->curveOID);
    if (rv != SECSuccess) {
        goto loser;
    }

    return SECSuccess;

loser:
    return SECFailure;
}
/*
 * 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
lg_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
lg_prepare_low_pqg_params_for_asn1(PQGParams *params)
{
    params->prime.type = siUnsignedInteger;
    params->subPrime.type = siUnsignedInteger;
    params->base.type = siUnsignedInteger;
}

void
lg_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
lg_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;
}

void
lg_prepare_low_ecparams_for_asn1(ECParams *params)
{
    params->DEREncoding.type = siUnsignedInteger;
    params->curveOID.type = siUnsignedInteger;
}

void
lg_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;
}

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

void
lg_nsslowkey_DestroyPublicKey(NSSLOWKEYPublicKey *pubk)
{
    if (pubk && pubk->arena) {
        PORT_FreeArena(pubk->arena, PR_FALSE);
    }
}

NSSLOWKEYPublicKey *
lg_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;
        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 = LGEC_CopyParams(arena, &(pubk->u.ec.ecParams),
                                     &(privk->u.ec.ecParams));
                if (rv == SECSuccess)
                    return pubk;
            }
            break;
        /* No Fortezza in Low Key implementations (Fortezza keys aren't
         * stored in our data base */
        default:
            break;
    }

    PORT_FreeArena(arena, PR_FALSE);
    return NULL;
}