mirror of
https://github.com/classilla/tenfourfox.git
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269 lines
8.0 KiB
C
269 lines
8.0 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* TLS 1.3 Protocol
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "keyhi.h"
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#include "pk11func.h"
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#include "secitem.h"
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#include "ssl.h"
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#include "sslt.h"
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#include "sslerr.h"
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#include "sslimpl.h"
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/* This table contains the mapping between TLS hash identifiers and the
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* PKCS#11 identifiers */
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static const struct {
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SSLHashType hash;
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CK_MECHANISM_TYPE pkcs11Mech;
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unsigned int hashSize;
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} kTlsHkdfInfo[] = {
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{ ssl_hash_none, 0, 0 },
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{ ssl_hash_md5, 0, 0 },
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{ ssl_hash_sha1, 0, 0 },
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{ ssl_hash_sha224, 0 },
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{ ssl_hash_sha256, CKM_NSS_HKDF_SHA256, 32 },
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{ ssl_hash_sha384, CKM_NSS_HKDF_SHA384, 48 },
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{ ssl_hash_sha512, CKM_NSS_HKDF_SHA512, 64 }
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};
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SECStatus
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tls13_HkdfExtract(PK11SymKey *ikm1, PK11SymKey *ikm2in, SSLHashType baseHash,
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PK11SymKey **prkp)
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{
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CK_NSS_HKDFParams params;
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SECItem paramsi;
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SECStatus rv;
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SECItem *salt;
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PK11SymKey *prk;
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static const PRUint8 zeroKeyBuf[HASH_LENGTH_MAX];
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PK11SymKey *zeroKey = NULL;
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PK11SlotInfo *slot = NULL;
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PK11SymKey *ikm2;
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params.bExtract = CK_TRUE;
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params.bExpand = CK_FALSE;
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params.pInfo = NULL;
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params.ulInfoLen = 0UL;
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if (ikm1) {
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/* TODO(ekr@rtfm.com): This violates the PKCS#11 key boundary
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* but is imposed on us by the present HKDF interface. */
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rv = PK11_ExtractKeyValue(ikm1);
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if (rv != SECSuccess)
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return rv;
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salt = PK11_GetKeyData(ikm1);
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if (!salt)
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return SECFailure;
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params.pSalt = salt->data;
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params.ulSaltLen = salt->len;
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PORT_Assert(salt->len > 0);
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} else {
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/* Per documentation for CKM_NSS_HKDF_*:
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*
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* If the optional salt is given, it is used; otherwise, the salt is
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* set to a sequence of zeros equal in length to the HMAC output.
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*/
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params.pSalt = NULL;
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params.ulSaltLen = 0UL;
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}
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paramsi.data = (unsigned char *)¶ms;
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paramsi.len = sizeof(params);
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PORT_Assert(kTlsHkdfInfo[baseHash].pkcs11Mech);
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PORT_Assert(kTlsHkdfInfo[baseHash].hashSize);
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PORT_Assert(kTlsHkdfInfo[baseHash].hash == baseHash);
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/* A zero ikm2 is a key of hash-length 0s. */
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if (!ikm2in) {
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SECItem zeroItem = {
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siBuffer,
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(unsigned char *)zeroKeyBuf,
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kTlsHkdfInfo[baseHash].hashSize
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};
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slot = PK11_GetInternalSlot();
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if (!slot) {
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return SECFailure;
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}
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zeroKey = PK11_ImportSymKey(slot,
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kTlsHkdfInfo[baseHash].pkcs11Mech,
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PK11_OriginUnwrap,
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CKA_DERIVE, &zeroItem, NULL);
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if (!zeroKey)
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return SECFailure;
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ikm2 = zeroKey;
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} else {
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ikm2 = ikm2in;
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}
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PORT_Assert(ikm2);
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PRINT_BUF(50, (NULL, "HKDF Extract: IKM1/Salt", params.pSalt, params.ulSaltLen));
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PRINT_KEY(50, (NULL, "HKDF Extract: IKM2", ikm2));
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prk = PK11_Derive(ikm2, kTlsHkdfInfo[baseHash].pkcs11Mech,
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¶msi, kTlsHkdfInfo[baseHash].pkcs11Mech,
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CKA_DERIVE, kTlsHkdfInfo[baseHash].hashSize);
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if (zeroKey)
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PK11_FreeSymKey(zeroKey);
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if (slot)
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PK11_FreeSlot(slot);
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if (!prk)
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return SECFailure;
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PRINT_KEY(50, (NULL, "HKDF Extract", prk));
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*prkp = prk;
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return SECSuccess;
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}
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SECStatus
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tls13_HkdfExpandLabel(PK11SymKey *prk, SSLHashType baseHash,
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const PRUint8 *handshakeHash, unsigned int handshakeHashLen,
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const char *label, unsigned int labelLen,
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CK_MECHANISM_TYPE algorithm, unsigned int keySize,
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PK11SymKey **keyp)
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{
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CK_NSS_HKDFParams params;
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SECItem paramsi = { siBuffer, NULL, 0 };
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/* Size of info array needs to be big enough to hold the maximum Prefix,
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* Label, plus HandshakeHash. If it's ever to small, the code will abort.
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*/
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PRUint8 info[256];
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sslBuffer infoBuf = SSL_BUFFER(info);
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PK11SymKey *derived;
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SECStatus rv;
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const char *kLabelPrefix = "tls13 ";
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const unsigned int kLabelPrefixLen = strlen(kLabelPrefix);
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PORT_Assert(prk);
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PORT_Assert(keyp);
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if ((handshakeHashLen > 255) ||
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(handshakeHash == NULL && handshakeHashLen > 0) ||
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(labelLen + kLabelPrefixLen > 255)) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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/*
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* [draft-ietf-tls-tls13-11] Section 7.1:
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*
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* HKDF-Expand-Label(Secret, Label, HashValue, Length) =
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* HKDF-Expand(Secret, HkdfLabel, Length)
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*
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* Where HkdfLabel is specified as:
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*
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* struct HkdfLabel {
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* uint16 length;
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* opaque label<9..255>;
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* opaque hash_value<0..255>;
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* };
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*
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* Where:
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* - HkdfLabel.length is Length
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* - HkdfLabel.hash_value is HashValue.
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* - HkdfLabel.label is "TLS 1.3, " + Label
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*
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*/
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rv = sslBuffer_AppendNumber(&infoBuf, keySize, 2);
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if (rv != SECSuccess) {
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return SECFailure;
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}
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rv = sslBuffer_AppendNumber(&infoBuf, labelLen + kLabelPrefixLen, 1);
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if (rv != SECSuccess) {
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return SECFailure;
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}
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rv = sslBuffer_Append(&infoBuf, kLabelPrefix, kLabelPrefixLen);
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if (rv != SECSuccess) {
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return SECFailure;
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}
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rv = sslBuffer_Append(&infoBuf, label, labelLen);
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if (rv != SECSuccess) {
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return SECFailure;
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}
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rv = sslBuffer_AppendVariable(&infoBuf, handshakeHash, handshakeHashLen, 1);
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if (rv != SECSuccess) {
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return SECFailure;
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}
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params.bExtract = CK_FALSE;
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params.bExpand = CK_TRUE;
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params.pInfo = SSL_BUFFER_BASE(&infoBuf);
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params.ulInfoLen = SSL_BUFFER_LEN(&infoBuf);
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paramsi.data = (unsigned char *)¶ms;
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paramsi.len = sizeof(params);
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derived = PK11_DeriveWithFlags(prk, kTlsHkdfInfo[baseHash].pkcs11Mech,
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¶msi, algorithm,
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CKA_DERIVE, keySize,
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CKF_SIGN | CKF_VERIFY);
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if (!derived)
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return SECFailure;
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*keyp = derived;
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#ifdef TRACE
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if (ssl_trace >= 50) {
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/* Make sure the label is null terminated. */
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char labelStr[100];
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PORT_Memcpy(labelStr, label, labelLen);
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labelStr[labelLen] = 0;
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SSL_TRC(50, ("HKDF Expand: label='tls13 %s',requested length=%d",
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labelStr, keySize));
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}
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PRINT_KEY(50, (NULL, "PRK", prk));
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PRINT_BUF(50, (NULL, "Hash", handshakeHash, handshakeHashLen));
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PRINT_BUF(50, (NULL, "Info", SSL_BUFFER_BASE(&infoBuf),
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SSL_BUFFER_LEN(&infoBuf)));
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PRINT_KEY(50, (NULL, "Derived key", derived));
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#endif
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return SECSuccess;
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}
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SECStatus
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tls13_HkdfExpandLabelRaw(PK11SymKey *prk, SSLHashType baseHash,
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const PRUint8 *handshakeHash, unsigned int handshakeHashLen,
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const char *label, unsigned int labelLen,
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unsigned char *output, unsigned int outputLen)
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{
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PK11SymKey *derived = NULL;
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SECItem *rawkey;
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SECStatus rv;
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rv = tls13_HkdfExpandLabel(prk, baseHash, handshakeHash, handshakeHashLen,
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label, labelLen,
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kTlsHkdfInfo[baseHash].pkcs11Mech, outputLen,
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&derived);
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if (rv != SECSuccess || !derived) {
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goto abort;
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}
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rv = PK11_ExtractKeyValue(derived);
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if (rv != SECSuccess) {
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goto abort;
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}
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rawkey = PK11_GetKeyData(derived);
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if (!rawkey) {
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goto abort;
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}
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PORT_Assert(rawkey->len == outputLen);
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memcpy(output, rawkey->data, outputLen);
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PK11_FreeSymKey(derived);
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return SECSuccess;
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abort:
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if (derived) {
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PK11_FreeSymKey(derived);
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}
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PORT_SetError(SSL_ERROR_SYM_KEY_CONTEXT_FAILURE);
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return SECFailure;
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}
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