SECKEYPublicKey*
CryptoKey::PublicKeyFromSpki(CryptoBuffer& aKeyData,
const nsNSSShutDownPreventionLock& /*proofOfLock*/)
{
ScopedSECItem spkiItem(aKeyData.ToSECItem());
if (!spkiItem) {
return nullptr;
}
ScopedCERTSubjectPublicKeyInfo spki(SECKEY_DecodeDERSubjectPublicKeyInfo(spkiItem.get()));
if (!spki) {
return nullptr;
}
// Check for id-ecDH. Per the WebCrypto spec we must support it but NSS
// does unfortunately not know about it. Let's change the algorithm to
// id-ecPublicKey to make NSS happy.
if (SECITEM_ItemsAreEqual(&SEC_OID_DATA_EC_DH, &spki->algorithm.algorithm)) {
// Retrieve OID data for id-ecPublicKey (1.2.840.10045.2.1).
SECOidData* oidData = SECOID_FindOIDByTag(SEC_OID_ANSIX962_EC_PUBLIC_KEY);
if (!oidData) {
return nullptr;
}
SECStatus rv = SECITEM_CopyItem(spki->arena, &spki->algorithm.algorithm,
&oidData->oid);
if (rv != SECSuccess) {
return nullptr;
}
}
return SECKEY_ExtractPublicKey(spki.get());
}
UniqueSECKEYPublicKey
CryptoKey::PublicKeyFromSpki(CryptoBuffer& aKeyData,
const nsNSSShutDownPreventionLock& /*proofOfLock*/)
{
UniquePLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
if (!arena) {
return nullptr;
}
SECItem spkiItem = { siBuffer, nullptr, 0 };
if (!aKeyData.ToSECItem(arena.get(), &spkiItem)) {
return nullptr;
}
UniqueCERTSubjectPublicKeyInfo spki(
SECKEY_DecodeDERSubjectPublicKeyInfo(&spkiItem));
if (!spki) {
return nullptr;
}
bool isECDHAlgorithm = SECITEM_ItemsAreEqual(&SEC_OID_DATA_EC_DH,
&spki->algorithm.algorithm);
bool isDHAlgorithm = SECITEM_ItemsAreEqual(&SEC_OID_DATA_DH_KEY_AGREEMENT,
&spki->algorithm.algorithm);
// Check for |id-ecDH| and |dhKeyAgreement|. Per the WebCrypto spec we must
// support these OIDs but NSS does unfortunately not know about them. Let's
// change the algorithm to |id-ecPublicKey| or |dhPublicKey| to make NSS happy.
if (isECDHAlgorithm || isDHAlgorithm) {
SECOidTag oid = SEC_OID_UNKNOWN;
if (isECDHAlgorithm) {
oid = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
} else if (isDHAlgorithm) {
oid = SEC_OID_X942_DIFFIE_HELMAN_KEY;
} else {
MOZ_ASSERT(false);
}
SECOidData* oidData = SECOID_FindOIDByTag(oid);
if (!oidData) {
return nullptr;
}
SECStatus rv = SECITEM_CopyItem(spki->arena, &spki->algorithm.algorithm,
&oidData->oid);
if (rv != SECSuccess) {
return nullptr;
}
}
UniqueSECKEYPublicKey tmp(SECKEY_ExtractPublicKey(spki.get()));
if (!tmp.get() || !PublicKeyValid(tmp.get())) {
return nullptr;
}
return UniqueSECKEYPublicKey(SECKEY_CopyPublicKey(tmp.get()));
}
static SECKEYPublicKey* getPublicKeyFromBytes(uint8_t *publicKeyBytes) {
uint8_t spkiBytes[TACK_PUBKEY_LENGTH + sizeof(SPKI_P256)];
memcpy(spkiBytes, SPKI_P256, sizeof(SPKI_P256));
memcpy(spkiBytes + sizeof(SPKI_P256), publicKeyBytes, TACK_PUBKEY_LENGTH);
SECItem spkiItem;
spkiItem.data = spkiBytes;
spkiItem.len = sizeof(spkiBytes);
CERTSubjectPublicKeyInfo *spki = SECKEY_DecodeDERSubjectPublicKeyInfo(&spkiItem);
SECKEYPublicKey *publicKey = SECKEY_ExtractPublicKey(spki);
SECKEY_DestroySubjectPublicKeyInfo(spki);
return publicKey;
}
SECKEYPublicKey*
CryptoKey::PublicKeyFromSpki(CryptoBuffer& aKeyData,
const nsNSSShutDownPreventionLock& /*proofOfLock*/)
{
ScopedSECItem spkiItem(aKeyData.ToSECItem());
if (!spkiItem) {
return nullptr;
}
ScopedCERTSubjectPublicKeyInfo spki(SECKEY_DecodeDERSubjectPublicKeyInfo(spkiItem.get()));
if (!spki) {
return nullptr;
}
return SECKEY_ExtractPublicKey(spki.get());
}
SECStatus
CheckPublicKeySize(const SECItem& subjectPublicKeyInfo,
/*out*/ ScopedSECKeyPublicKey& publicKey)
{
ScopedPtr<CERTSubjectPublicKeyInfo, SECKEY_DestroySubjectPublicKeyInfo>
spki(SECKEY_DecodeDERSubjectPublicKeyInfo(&subjectPublicKeyInfo));
if (!spki) {
return SECFailure;
}
publicKey = SECKEY_ExtractPublicKey(spki.get());
if (!publicKey) {
return SECFailure;
}
static const unsigned int MINIMUM_NON_ECC_BITS = 1024;
switch (publicKey.get()->keyType) {
case ecKey:
// TODO(bug 622859): We should check which curve.
return SECSuccess;
case dsaKey: // fall through
case rsaKey:
// TODO(bug 622859): Enforce a minimum of 2048 bits for EV certs.
if (SECKEY_PublicKeyStrengthInBits(publicKey.get()) < MINIMUM_NON_ECC_BITS) {
// TODO(bug 1031946): Create a new error code.
PR_SetError(SEC_ERROR_INVALID_KEY, 0);
return SECFailure;
}
break;
case nullKey:
case fortezzaKey:
case dhKey:
case keaKey:
case rsaPssKey:
case rsaOaepKey:
default:
PR_SetError(SEC_ERROR_UNSUPPORTED_KEYALG, 0);
return SECFailure;
}
return SECSuccess;
}
NS_IMETHODIMP
nsDataSignatureVerifier::VerifyData(const nsACString & aData,
const nsACString & aSignature,
const nsACString & aPublicKey,
bool *_retval)
{
// Allocate an arena to handle the majority of the allocations
PRArenaPool *arena;
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (!arena)
return NS_ERROR_OUT_OF_MEMORY;
// Base 64 decode the key
SECItem keyItem;
PORT_Memset(&keyItem, 0, sizeof(SECItem));
if (!NSSBase64_DecodeBuffer(arena, &keyItem,
nsPromiseFlatCString(aPublicKey).get(),
aPublicKey.Length())) {
PORT_FreeArena(arena, false);
return NS_ERROR_FAILURE;
}
// Extract the public key from the data
CERTSubjectPublicKeyInfo *pki = SECKEY_DecodeDERSubjectPublicKeyInfo(&keyItem);
if (!pki) {
PORT_FreeArena(arena, false);
return NS_ERROR_FAILURE;
}
SECKEYPublicKey *publicKey = SECKEY_ExtractPublicKey(pki);
SECKEY_DestroySubjectPublicKeyInfo(pki);
pki = nullptr;
if (!publicKey) {
PORT_FreeArena(arena, false);
return NS_ERROR_FAILURE;
}
// Base 64 decode the signature
SECItem signatureItem;
PORT_Memset(&signatureItem, 0, sizeof(SECItem));
if (!NSSBase64_DecodeBuffer(arena, &signatureItem,
nsPromiseFlatCString(aSignature).get(),
aSignature.Length())) {
SECKEY_DestroyPublicKey(publicKey);
PORT_FreeArena(arena, false);
return NS_ERROR_FAILURE;
}
// Decode the signature and algorithm
CERTSignedData sigData;
PORT_Memset(&sigData, 0, sizeof(CERTSignedData));
SECStatus ss = SEC_QuickDERDecodeItem(arena, &sigData,
CERT_SignatureDataTemplate,
&signatureItem);
if (ss != SECSuccess) {
SECKEY_DestroyPublicKey(publicKey);
PORT_FreeArena(arena, false);
return NS_ERROR_FAILURE;
}
// Perform the final verification
DER_ConvertBitString(&(sigData.signature));
ss = VFY_VerifyDataWithAlgorithmID((const unsigned char*)nsPromiseFlatCString(aData).get(),
aData.Length(), publicKey,
&(sigData.signature),
&(sigData.signatureAlgorithm),
NULL, NULL);
// Clean up remaining objects
SECKEY_DestroyPublicKey(publicKey);
PORT_FreeArena(arena, false);
*_retval = (ss == SECSuccess);
return NS_OK;
}
