summaryrefslogtreecommitdiffstats
path: root/security/nss/lib/cryptohi/secsign.c
blob: 8a8d0f664381eedaaa100e8ef739550a777d2357 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
/*
 * Signature stuff.
 *
 * 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 <stdio.h>
#include "cryptohi.h"
#include "sechash.h"
#include "secder.h"
#include "keyhi.h"
#include "secoid.h"
#include "secdig.h"
#include "pk11func.h"
#include "secerr.h"
#include "keyi.h"

struct SGNContextStr {
    SECOidTag signalg;
    SECOidTag hashalg;
    void *hashcx;
    const SECHashObject *hashobj;
    SECKEYPrivateKey *key;
    SECItem *params;
};

static SGNContext *
sgn_NewContext(SECOidTag alg, SECItem *params, SECKEYPrivateKey *key)
{
    SGNContext *cx;
    SECOidTag hashalg, signalg;
    KeyType keyType;
    SECStatus rv;

    /* OK, map a PKCS #7 hash and encrypt algorithm into
     * a standard hashing algorithm. Why did we pass in the whole
     * PKCS #7 algTag if we were just going to change here you might
     * ask. Well the answer is for some cards we may have to do the
     * hashing on card. It may not support CKM_RSA_PKCS sign algorithm,
     * it may just support CKM_SHA1_RSA_PKCS and/or CKM_MD5_RSA_PKCS.
     */
    /* we have a private key, not a public key, so don't pass it in */
    rv = sec_DecodeSigAlg(NULL, alg, params, &signalg, &hashalg);
    if (rv != SECSuccess) {
        PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
        return 0;
    }
    keyType = seckey_GetKeyType(signalg);

    /* verify our key type */
    if (key->keyType != keyType &&
        !((key->keyType == dsaKey) && (keyType == fortezzaKey)) &&
        !((key->keyType == rsaKey) && (keyType == rsaPssKey))) {
        PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
        return 0;
    }

    cx = (SGNContext *)PORT_ZAlloc(sizeof(SGNContext));
    if (cx) {
        cx->hashalg = hashalg;
        cx->signalg = signalg;
        cx->key = key;
        cx->params = params;
    }
    return cx;
}

SGNContext *
SGN_NewContext(SECOidTag alg, SECKEYPrivateKey *key)
{
    return sgn_NewContext(alg, NULL, key);
}

SGNContext *
SGN_NewContextWithAlgorithmID(SECAlgorithmID *alg, SECKEYPrivateKey *key)
{
    SECOidTag tag = SECOID_GetAlgorithmTag(alg);
    return sgn_NewContext(tag, &alg->parameters, key);
}

void
SGN_DestroyContext(SGNContext *cx, PRBool freeit)
{
    if (cx) {
        if (cx->hashcx != NULL) {
            (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
            cx->hashcx = NULL;
        }
        if (freeit) {
            PORT_ZFree(cx, sizeof(SGNContext));
        }
    }
}

SECStatus
SGN_Begin(SGNContext *cx)
{
    if (cx->hashcx != NULL) {
        (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
        cx->hashcx = NULL;
    }

    cx->hashobj = HASH_GetHashObjectByOidTag(cx->hashalg);
    if (!cx->hashobj)
        return SECFailure; /* error code is already set */

    cx->hashcx = (*cx->hashobj->create)();
    if (cx->hashcx == NULL)
        return SECFailure;

    (*cx->hashobj->begin)(cx->hashcx);
    return SECSuccess;
}

SECStatus
SGN_Update(SGNContext *cx, const unsigned char *input, unsigned int inputLen)
{
    if (cx->hashcx == NULL) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    (*cx->hashobj->update)(cx->hashcx, input, inputLen);
    return SECSuccess;
}

/* XXX Old template; want to expunge it eventually. */
static DERTemplate SECAlgorithmIDTemplate[] = {
    { DER_SEQUENCE,
      0, NULL, sizeof(SECAlgorithmID) },
    { DER_OBJECT_ID,
      offsetof(SECAlgorithmID, algorithm) },
    { DER_OPTIONAL | DER_ANY,
      offsetof(SECAlgorithmID, parameters) },
    { 0 }
};

/*
 * XXX OLD Template.  Once all uses have been switched over to new one,
 * remove this.
 */
static DERTemplate SGNDigestInfoTemplate[] = {
    { DER_SEQUENCE,
      0, NULL, sizeof(SGNDigestInfo) },
    { DER_INLINE,
      offsetof(SGNDigestInfo, digestAlgorithm),
      SECAlgorithmIDTemplate },
    { DER_OCTET_STRING,
      offsetof(SGNDigestInfo, digest) },
    { 0 }
};

SECStatus
SGN_End(SGNContext *cx, SECItem *result)
{
    unsigned char digest[HASH_LENGTH_MAX];
    unsigned part1;
    int signatureLen;
    SECStatus rv;
    SECItem digder, sigitem;
    PLArenaPool *arena = 0;
    SECKEYPrivateKey *privKey = cx->key;
    SGNDigestInfo *di = 0;

    result->data = 0;
    digder.data = 0;
    sigitem.data = 0;

    /* Finish up digest function */
    if (cx->hashcx == NULL) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    (*cx->hashobj->end)(cx->hashcx, digest, &part1, sizeof(digest));

    if (privKey->keyType == rsaKey &&
        cx->signalg != SEC_OID_PKCS1_RSA_PSS_SIGNATURE) {

        arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
        if (!arena) {
            rv = SECFailure;
            goto loser;
        }

        /* Construct digest info */
        di = SGN_CreateDigestInfo(cx->hashalg, digest, part1);
        if (!di) {
            rv = SECFailure;
            goto loser;
        }

        /* Der encode the digest as a DigestInfo */
        rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate,
                        di);
        if (rv != SECSuccess) {
            goto loser;
        }
    } else {
        digder.data = digest;
        digder.len = part1;
    }

    /*
    ** Encrypt signature after constructing appropriate PKCS#1 signature
    ** block
    */
    signatureLen = PK11_SignatureLen(privKey);
    if (signatureLen <= 0) {
        PORT_SetError(SEC_ERROR_INVALID_KEY);
        rv = SECFailure;
        goto loser;
    }
    sigitem.len = signatureLen;
    sigitem.data = (unsigned char *)PORT_Alloc(signatureLen);

    if (sigitem.data == NULL) {
        rv = SECFailure;
        goto loser;
    }

    if (cx->signalg == SEC_OID_PKCS1_RSA_PSS_SIGNATURE) {
        CK_RSA_PKCS_PSS_PARAMS mech;
        SECItem mechItem = { siBuffer, (unsigned char *)&mech, sizeof(mech) };

        PORT_Memset(&mech, 0, sizeof(mech));

        if (cx->params && cx->params->data) {
            arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
            if (!arena) {
                rv = SECFailure;
                goto loser;
            }

            rv = sec_DecodeRSAPSSParamsToMechanism(arena, cx->params, &mech);
            if (rv != SECSuccess) {
                goto loser;
            }
        } else {
            mech.hashAlg = CKM_SHA_1;
            mech.mgf = CKG_MGF1_SHA1;
            mech.sLen = digder.len;
        }
        rv = PK11_SignWithMechanism(privKey, CKM_RSA_PKCS_PSS, &mechItem,
                                    &sigitem, &digder);
        if (rv != SECSuccess) {
            goto loser;
        }
    } else {
        rv = PK11_Sign(privKey, &sigitem, &digder);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    if ((cx->signalg == SEC_OID_ANSIX9_DSA_SIGNATURE) ||
        (cx->signalg == SEC_OID_ANSIX962_EC_PUBLIC_KEY)) {
        /* DSAU_EncodeDerSigWithLen works for DSA and ECDSA */
        rv = DSAU_EncodeDerSigWithLen(result, &sigitem, sigitem.len);
        if (rv != SECSuccess)
            goto loser;
        SECITEM_FreeItem(&sigitem, PR_FALSE);
    } else {
        result->len = sigitem.len;
        result->data = sigitem.data;
    }

loser:
    if (rv != SECSuccess) {
        SECITEM_FreeItem(&sigitem, PR_FALSE);
    }
    SGN_DestroyDigestInfo(di);
    if (arena != NULL) {
        PORT_FreeArena(arena, PR_FALSE);
    }
    return rv;
}

/************************************************************************/

static SECStatus
sec_SignData(SECItem *res, const unsigned char *buf, int len,
             SECKEYPrivateKey *pk, SECOidTag algid, SECItem *params)
{
    SECStatus rv;
    SGNContext *sgn;

    sgn = sgn_NewContext(algid, params, pk);

    if (sgn == NULL)
        return SECFailure;

    rv = SGN_Begin(sgn);
    if (rv != SECSuccess)
        goto loser;

    rv = SGN_Update(sgn, buf, len);
    if (rv != SECSuccess)
        goto loser;

    rv = SGN_End(sgn, res);

loser:
    SGN_DestroyContext(sgn, PR_TRUE);
    return rv;
}

/*
** Sign a block of data returning in result a bunch of bytes that are the
** signature. Returns zero on success, an error code on failure.
*/
SECStatus
SEC_SignData(SECItem *res, const unsigned char *buf, int len,
             SECKEYPrivateKey *pk, SECOidTag algid)
{
    return sec_SignData(res, buf, len, pk, algid, NULL);
}

SECStatus
SEC_SignDataWithAlgorithmID(SECItem *res, const unsigned char *buf, int len,
                            SECKEYPrivateKey *pk, SECAlgorithmID *algid)
{
    SECOidTag tag = SECOID_GetAlgorithmTag(algid);
    return sec_SignData(res, buf, len, pk, tag, &algid->parameters);
}

/************************************************************************/

DERTemplate CERTSignedDataTemplate[] =
    {
      { DER_SEQUENCE,
        0, NULL, sizeof(CERTSignedData) },
      { DER_ANY,
        offsetof(CERTSignedData, data) },
      { DER_INLINE,
        offsetof(CERTSignedData, signatureAlgorithm),
        SECAlgorithmIDTemplate },
      { DER_BIT_STRING,
        offsetof(CERTSignedData, signature) },
      { 0 }
    };

SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)

const SEC_ASN1Template CERT_SignedDataTemplate[] =
    {
      { SEC_ASN1_SEQUENCE,
        0, NULL, sizeof(CERTSignedData) },
      { SEC_ASN1_ANY,
        offsetof(CERTSignedData, data) },
      { SEC_ASN1_INLINE | SEC_ASN1_XTRN,
        offsetof(CERTSignedData, signatureAlgorithm),
        SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
      { SEC_ASN1_BIT_STRING,
        offsetof(CERTSignedData, signature) },
      { 0 }
    };

SEC_ASN1_CHOOSER_IMPLEMENT(CERT_SignedDataTemplate)

static SECStatus
sec_DerSignData(PLArenaPool *arena, SECItem *result,
                const unsigned char *buf, int len, SECKEYPrivateKey *pk,
                SECOidTag algID, SECItem *params)
{
    SECItem it;
    CERTSignedData sd;
    SECStatus rv;

    it.data = 0;

    /* XXX We should probably have some asserts here to make sure the key type
     * and algID match
     */

    if (algID == SEC_OID_UNKNOWN) {
        switch (pk->keyType) {
            case rsaKey:
                algID = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
                break;
            case dsaKey:
                /* get Signature length (= q_len*2) and work from there */
                switch (PK11_SignatureLen(pk)) {
                    case 320:
                        algID = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
                        break;
                    case 448:
                        algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST;
                        break;
                    case 512:
                    default:
                        algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST;
                        break;
                }
                break;
            case ecKey:
                algID = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE;
                break;
            default:
                PORT_SetError(SEC_ERROR_INVALID_KEY);
                return SECFailure;
        }
    }

    /* Sign input buffer */
    rv = sec_SignData(&it, buf, len, pk, algID, params);
    if (rv)
        goto loser;

    /* Fill out SignedData object */
    PORT_Memset(&sd, 0, sizeof(sd));
    sd.data.data = (unsigned char *)buf;
    sd.data.len = len;
    sd.signature.data = it.data;
    sd.signature.len = it.len << 3; /* convert to bit string */
    rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algID, params);
    if (rv)
        goto loser;

    /* DER encode the signed data object */
    rv = DER_Encode(arena, result, CERTSignedDataTemplate, &sd);
/* FALL THROUGH */

loser:
    PORT_Free(it.data);
    return rv;
}

SECStatus
SEC_DerSignData(PLArenaPool *arena, SECItem *result,
                const unsigned char *buf, int len, SECKEYPrivateKey *pk,
                SECOidTag algID)
{
    return sec_DerSignData(arena, result, buf, len, pk, algID, NULL);
}

SECStatus
SEC_DerSignDataWithAlgorithmID(PLArenaPool *arena, SECItem *result,
                               const unsigned char *buf, int len,
                               SECKEYPrivateKey *pk,
                               SECAlgorithmID *algID)
{
    SECOidTag tag = SECOID_GetAlgorithmTag(algID);
    return sec_DerSignData(arena, result, buf, len, pk, tag, &algID->parameters);
}

SECStatus
SGN_Digest(SECKEYPrivateKey *privKey,
           SECOidTag algtag, SECItem *result, SECItem *digest)
{
    int modulusLen;
    SECStatus rv;
    SECItem digder;
    PLArenaPool *arena = 0;
    SGNDigestInfo *di = 0;

    result->data = 0;

    if (privKey->keyType == rsaKey) {

        arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
        if (!arena) {
            rv = SECFailure;
            goto loser;
        }

        /* Construct digest info */
        di = SGN_CreateDigestInfo(algtag, digest->data, digest->len);
        if (!di) {
            rv = SECFailure;
            goto loser;
        }

        /* Der encode the digest as a DigestInfo */
        rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate,
                        di);
        if (rv != SECSuccess) {
            goto loser;
        }
    } else {
        digder.data = digest->data;
        digder.len = digest->len;
    }

    /*
    ** Encrypt signature after constructing appropriate PKCS#1 signature
    ** block
    */
    modulusLen = PK11_SignatureLen(privKey);
    if (modulusLen <= 0) {
        PORT_SetError(SEC_ERROR_INVALID_KEY);
        rv = SECFailure;
        goto loser;
    }
    result->len = modulusLen;
    result->data = (unsigned char *)PORT_Alloc(modulusLen);
    result->type = siBuffer;

    if (result->data == NULL) {
        rv = SECFailure;
        goto loser;
    }

    rv = PK11_Sign(privKey, result, &digder);
    if (rv != SECSuccess) {
        PORT_Free(result->data);
        result->data = NULL;
    }

loser:
    SGN_DestroyDigestInfo(di);
    if (arena != NULL) {
        PORT_FreeArena(arena, PR_FALSE);
    }
    return rv;
}

SECOidTag
SEC_GetSignatureAlgorithmOidTag(KeyType keyType, SECOidTag hashAlgTag)
{
    SECOidTag sigTag = SEC_OID_UNKNOWN;

    switch (keyType) {
        case rsaKey:
            switch (hashAlgTag) {
                case SEC_OID_MD2:
                    sigTag = SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_MD5:
                    sigTag = SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_SHA1:
                    sigTag = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_SHA224:
                    sigTag = SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_UNKNOWN: /* default for RSA if not specified */
                case SEC_OID_SHA256:
                    sigTag = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_SHA384:
                    sigTag = SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION;
                    break;
                case SEC_OID_SHA512:
                    sigTag = SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION;
                    break;
                default:
                    break;
            }
            break;
        case dsaKey:
            switch (hashAlgTag) {
                case SEC_OID_SHA1:
                    sigTag = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
                    break;
                case SEC_OID_SHA224:
                    sigTag = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST;
                    break;
                case SEC_OID_UNKNOWN: /* default for DSA if not specified */
                case SEC_OID_SHA256:
                    sigTag = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST;
                    break;
                default:
                    break;
            }
            break;
        case ecKey:
            switch (hashAlgTag) {
                case SEC_OID_SHA1:
                    sigTag = SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE;
                    break;
                case SEC_OID_SHA224:
                    sigTag = SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE;
                    break;
                case SEC_OID_UNKNOWN: /* default for ECDSA if not specified */
                case SEC_OID_SHA256:
                    sigTag = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE;
                    break;
                case SEC_OID_SHA384:
                    sigTag = SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE;
                    break;
                case SEC_OID_SHA512:
                    sigTag = SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE;
                    break;
                default:
                    break;
            }
        default:
            break;
    }
    return sigTag;
}

static SECItem *
sec_CreateRSAPSSParameters(PLArenaPool *arena,
                           SECItem *result,
                           SECOidTag hashAlgTag,
                           const SECItem *params,
                           const SECKEYPrivateKey *key)
{
    SECKEYRSAPSSParams pssParams;
    int modBytes, hashLength;
    unsigned long saltLength;
    PRBool defaultSHA1 = PR_FALSE;
    SECStatus rv;

    if (key->keyType != rsaKey && key->keyType != rsaPssKey) {
        PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
        return NULL;
    }

    PORT_Memset(&pssParams, 0, sizeof(pssParams));

    if (params && params->data) {
        /* The parameters field should either be empty or contain
         * valid RSA-PSS parameters */
        PORT_Assert(!(params->len == 2 &&
                      params->data[0] == SEC_ASN1_NULL &&
                      params->data[1] == 0));
        rv = SEC_QuickDERDecodeItem(arena, &pssParams,
                                    SECKEY_RSAPSSParamsTemplate,
                                    params);
        if (rv != SECSuccess) {
            return NULL;
        }
        defaultSHA1 = PR_TRUE;
    }

    if (pssParams.trailerField.data) {
        unsigned long trailerField;

        rv = SEC_ASN1DecodeInteger((SECItem *)&pssParams.trailerField,
                                   &trailerField);
        if (rv != SECSuccess) {
            return NULL;
        }
        if (trailerField != 1) {
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            return NULL;
        }
    }

    modBytes = PK11_GetPrivateModulusLen((SECKEYPrivateKey *)key);

    /* Determine the hash algorithm to use, based on hashAlgTag and
     * pssParams.hashAlg; there are four cases */
    if (hashAlgTag != SEC_OID_UNKNOWN) {
        SECOidTag tag = SEC_OID_UNKNOWN;

        if (pssParams.hashAlg) {
            tag = SECOID_GetAlgorithmTag(pssParams.hashAlg);
        } else if (defaultSHA1) {
            tag = SEC_OID_SHA1;
        }

        if (tag != SEC_OID_UNKNOWN && tag != hashAlgTag) {
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            return NULL;
        }
    } else if (hashAlgTag == SEC_OID_UNKNOWN) {
        if (pssParams.hashAlg) {
            hashAlgTag = SECOID_GetAlgorithmTag(pssParams.hashAlg);
        } else if (defaultSHA1) {
            hashAlgTag = SEC_OID_SHA1;
        } else {
            /* Find a suitable hash algorithm based on the NIST recommendation */
            if (modBytes <= 384) { /* 128, in NIST 800-57, Part 1 */
                hashAlgTag = SEC_OID_SHA256;
            } else if (modBytes <= 960) { /* 192, NIST 800-57, Part 1 */
                hashAlgTag = SEC_OID_SHA384;
            } else {
                hashAlgTag = SEC_OID_SHA512;
            }
        }
    }

    if (hashAlgTag != SEC_OID_SHA1 && hashAlgTag != SEC_OID_SHA224 &&
        hashAlgTag != SEC_OID_SHA256 && hashAlgTag != SEC_OID_SHA384 &&
        hashAlgTag != SEC_OID_SHA512) {
        PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
        return NULL;
    }

    /* Now that the hash algorithm is decided, check if it matches the
     * existing parameters if any */
    if (pssParams.maskAlg) {
        SECAlgorithmID maskHashAlg;

        if (SECOID_GetAlgorithmTag(pssParams.maskAlg) != SEC_OID_PKCS1_MGF1) {
            PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
            return NULL;
        }

        if (pssParams.maskAlg->parameters.data == NULL) {
            PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
            return NULL;
        }

        PORT_Memset(&maskHashAlg, 0, sizeof(maskHashAlg));
        rv = SEC_QuickDERDecodeItem(arena, &maskHashAlg,
                                    SEC_ASN1_GET(SECOID_AlgorithmIDTemplate),
                                    &pssParams.maskAlg->parameters);
        if (rv != SECSuccess) {
            return NULL;
        }

        /* Following the recommendation in RFC 4055, assume the hash
         * algorithm identical to pssParam.hashAlg */
        if (SECOID_GetAlgorithmTag(&maskHashAlg) != hashAlgTag) {
            PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
            return NULL;
        }
    } else if (defaultSHA1) {
        if (hashAlgTag != SEC_OID_SHA1) {
            PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
            return NULL;
        }
    }

    hashLength = HASH_ResultLenByOidTag(hashAlgTag);

    if (pssParams.saltLength.data) {
        rv = SEC_ASN1DecodeInteger((SECItem *)&pssParams.saltLength,
                                   &saltLength);
        if (rv != SECSuccess) {
            return NULL;
        }

        /* The specified salt length is too long */
        if (saltLength > modBytes - hashLength - 2) {
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            return NULL;
        }
    } else if (defaultSHA1) {
        saltLength = 20;
    }

    /* Fill in the parameters */
    if (pssParams.hashAlg) {
        if (hashAlgTag == SEC_OID_SHA1) {
            /* Omit hashAlg if the the algorithm is SHA-1 (default) */
            pssParams.hashAlg = NULL;
        }
    } else {
        if (hashAlgTag != SEC_OID_SHA1) {
            pssParams.hashAlg = PORT_ArenaZAlloc(arena, sizeof(SECAlgorithmID));
            if (!pssParams.hashAlg) {
                return NULL;
            }
            rv = SECOID_SetAlgorithmID(arena, pssParams.hashAlg, hashAlgTag,
                                       NULL);
            if (rv != SECSuccess) {
                return NULL;
            }
        }
    }

    if (pssParams.maskAlg) {
        if (hashAlgTag == SEC_OID_SHA1) {
            /* Omit maskAlg if the the algorithm is SHA-1 (default) */
            pssParams.maskAlg = NULL;
        }
    } else {
        if (hashAlgTag != SEC_OID_SHA1) {
            SECItem *hashAlgItem;

            PORT_Assert(pssParams.hashAlg != NULL);

            hashAlgItem = SEC_ASN1EncodeItem(arena, NULL, pssParams.hashAlg,
                                             SEC_ASN1_GET(SECOID_AlgorithmIDTemplate));
            if (!hashAlgItem) {
                return NULL;
            }
            pssParams.maskAlg = PORT_ArenaZAlloc(arena, sizeof(SECAlgorithmID));
            if (!pssParams.maskAlg) {
                return NULL;
            }
            rv = SECOID_SetAlgorithmID(arena, pssParams.maskAlg,
                                       SEC_OID_PKCS1_MGF1, hashAlgItem);
            if (rv != SECSuccess) {
                return NULL;
            }
        }
    }

    if (pssParams.saltLength.data) {
        if (saltLength == 20) {
            /* Omit the salt length if it is the default */
            pssParams.saltLength.data = NULL;
        }
    } else {
        /* Find a suitable length from the hash algorithm and modulus bits */
        saltLength = PR_MIN(hashLength, modBytes - hashLength - 2);

        if (saltLength != 20 &&
            !SEC_ASN1EncodeInteger(arena, &pssParams.saltLength, saltLength)) {
            return NULL;
        }
    }

    if (pssParams.trailerField.data) {
        /* Omit trailerField if the value is 1 (default) */
        pssParams.trailerField.data = NULL;
    }

    return SEC_ASN1EncodeItem(arena, result,
                              &pssParams, SECKEY_RSAPSSParamsTemplate);
}

SECItem *
SEC_CreateSignatureAlgorithmParameters(PLArenaPool *arena,
                                       SECItem *result,
                                       SECOidTag signAlgTag,
                                       SECOidTag hashAlgTag,
                                       const SECItem *params,
                                       const SECKEYPrivateKey *key)
{
    switch (signAlgTag) {
        case SEC_OID_PKCS1_RSA_PSS_SIGNATURE:
            return sec_CreateRSAPSSParameters(arena, result,
                                              hashAlgTag, params, key);

        default:
            if (params == NULL)
                return NULL;
            if (result == NULL)
                result = SECITEM_AllocItem(arena, NULL, 0);
            if (SECITEM_CopyItem(arena, result, params) != SECSuccess)
                return NULL;
            return result;
    }
}