/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#ifndef mozilla_dom_WebCryptoCommon_h
#define mozilla_dom_WebCryptoCommon_h

// XXX Several of these dependencies could be removed by moving implementations
// to the cpp file.

#include <cstdint>
#include <cstring>
#include "js/StructuredClone.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/CryptoBuffer.h"
#include "mozilla/fallible.h"
#include "nsContentUtils.h"
#include "nsLiteralString.h"
#include "nsStringFwd.h"
#include "pkcs11t.h"
#include "plarena.h"
#include "secasn1t.h"
#include "seccomon.h"
#include "secitem.h"
#include "secoid.h"
#include "secoidt.h"
#include "ScopedNSSTypes.h"

struct JSStructuredCloneReader;
struct JSStructuredCloneWriter;

// WebCrypto algorithm names
#define WEBCRYPTO_ALG_AES_CBC "AES-CBC"
#define WEBCRYPTO_ALG_AES_CTR "AES-CTR"
#define WEBCRYPTO_ALG_AES_GCM "AES-GCM"
#define WEBCRYPTO_ALG_AES_KW "AES-KW"
#define WEBCRYPTO_ALG_SHA1 "SHA-1"
#define WEBCRYPTO_ALG_SHA256 "SHA-256"
#define WEBCRYPTO_ALG_SHA384 "SHA-384"
#define WEBCRYPTO_ALG_SHA512 "SHA-512"
#define WEBCRYPTO_ALG_HMAC "HMAC"
#define WEBCRYPTO_ALG_HKDF "HKDF"
#define WEBCRYPTO_ALG_PBKDF2 "PBKDF2"
#define WEBCRYPTO_ALG_RSASSA_PKCS1 "RSASSA-PKCS1-v1_5"
#define WEBCRYPTO_ALG_RSA_OAEP "RSA-OAEP"
#define WEBCRYPTO_ALG_RSA_PSS "RSA-PSS"
#define WEBCRYPTO_ALG_ECDH "ECDH"
#define WEBCRYPTO_ALG_ECDSA "ECDSA"

// WebCrypto key formats
#define WEBCRYPTO_KEY_FORMAT_RAW "raw"
#define WEBCRYPTO_KEY_FORMAT_PKCS8 "pkcs8"
#define WEBCRYPTO_KEY_FORMAT_SPKI "spki"
#define WEBCRYPTO_KEY_FORMAT_JWK "jwk"

// WebCrypto key types
#define WEBCRYPTO_KEY_TYPE_PUBLIC "public"
#define WEBCRYPTO_KEY_TYPE_PRIVATE "private"
#define WEBCRYPTO_KEY_TYPE_SECRET "secret"

// WebCrypto key usages
#define WEBCRYPTO_KEY_USAGE_ENCRYPT "encrypt"
#define WEBCRYPTO_KEY_USAGE_DECRYPT "decrypt"
#define WEBCRYPTO_KEY_USAGE_SIGN "sign"
#define WEBCRYPTO_KEY_USAGE_VERIFY "verify"
#define WEBCRYPTO_KEY_USAGE_DERIVEKEY "deriveKey"
#define WEBCRYPTO_KEY_USAGE_DERIVEBITS "deriveBits"
#define WEBCRYPTO_KEY_USAGE_WRAPKEY "wrapKey"
#define WEBCRYPTO_KEY_USAGE_UNWRAPKEY "unwrapKey"

// WebCrypto named curves
#define WEBCRYPTO_NAMED_CURVE_P256 "P-256"
#define WEBCRYPTO_NAMED_CURVE_P384 "P-384"
#define WEBCRYPTO_NAMED_CURVE_P521 "P-521"

// JWK key types
#define JWK_TYPE_SYMMETRIC "oct"
#define JWK_TYPE_RSA "RSA"
#define JWK_TYPE_EC "EC"

// JWK algorithms
#define JWK_ALG_A128CBC "A128CBC"  // CBC
#define JWK_ALG_A192CBC "A192CBC"
#define JWK_ALG_A256CBC "A256CBC"
#define JWK_ALG_A128CTR "A128CTR"  // CTR
#define JWK_ALG_A192CTR "A192CTR"
#define JWK_ALG_A256CTR "A256CTR"
#define JWK_ALG_A128GCM "A128GCM"  // GCM
#define JWK_ALG_A192GCM "A192GCM"
#define JWK_ALG_A256GCM "A256GCM"
#define JWK_ALG_A128KW "A128KW"  // KW
#define JWK_ALG_A192KW "A192KW"
#define JWK_ALG_A256KW "A256KW"
#define JWK_ALG_HS1 "HS1"  // HMAC
#define JWK_ALG_HS256 "HS256"
#define JWK_ALG_HS384 "HS384"
#define JWK_ALG_HS512 "HS512"
#define JWK_ALG_RS1 "RS1"  // RSASSA-PKCS1
#define JWK_ALG_RS256 "RS256"
#define JWK_ALG_RS384 "RS384"
#define JWK_ALG_RS512 "RS512"
#define JWK_ALG_RSA_OAEP "RSA-OAEP"  // RSA-OAEP
#define JWK_ALG_RSA_OAEP_256 "RSA-OAEP-256"
#define JWK_ALG_RSA_OAEP_384 "RSA-OAEP-384"
#define JWK_ALG_RSA_OAEP_512 "RSA-OAEP-512"
#define JWK_ALG_PS1 "PS1"  // RSA-PSS
#define JWK_ALG_PS256 "PS256"
#define JWK_ALG_PS384 "PS384"
#define JWK_ALG_PS512 "PS512"
// The JSON Web Algorithms spec (RFC 7518) uses the hash to identify these, not
// the curve.
#define JWK_ALG_ECDSA_P_256 "ES256"
#define JWK_ALG_ECDSA_P_384 "ES384"
#define JWK_ALG_ECDSA_P_521 "ES512"

// JWK usages
#define JWK_USE_ENC "enc"
#define JWK_USE_SIG "sig"

// Define an unknown mechanism type
#define UNKNOWN_CK_MECHANISM CKM_VENDOR_DEFINED + 1

// python security/pkix/tools/DottedOIDToCode.py id-ecDH 1.3.132.112
static const uint8_t id_ecDH[] = {0x2b, 0x81, 0x04, 0x70};
const SECItem SEC_OID_DATA_EC_DH = {
    siBuffer, (unsigned char*)id_ecDH,
    static_cast<unsigned int>(mozilla::ArrayLength(id_ecDH))};

namespace mozilla::dom {

inline bool ReadBuffer(JSStructuredCloneReader* aReader,
                       CryptoBuffer& aBuffer) {
  uint32_t length, zero;
  bool ret = JS_ReadUint32Pair(aReader, &length, &zero);
  if (!ret) {
    return false;
  }

  if (length > 0) {
    if (!aBuffer.SetLength(length, fallible)) {
      return false;
    }
    ret = JS_ReadBytes(aReader, aBuffer.Elements(), aBuffer.Length());
  }
  return ret;
}

inline bool WriteBuffer(JSStructuredCloneWriter* aWriter,
                        const uint8_t* aBuffer, size_t aLength) {
  bool ret = JS_WriteUint32Pair(aWriter, aLength, 0);
  if (ret && aLength > 0) {
    ret = JS_WriteBytes(aWriter, aBuffer, aLength);
  }
  return ret;
}

inline bool WriteBuffer(JSStructuredCloneWriter* aWriter,
                        const CryptoBuffer& aBuffer) {
  return WriteBuffer(aWriter, aBuffer.Elements(), aBuffer.Length());
}

inline CK_MECHANISM_TYPE MapAlgorithmNameToMechanism(const nsString& aName) {
  CK_MECHANISM_TYPE mechanism(UNKNOWN_CK_MECHANISM);

  // Set mechanism based on algorithm name
  if (aName.EqualsLiteral(WEBCRYPTO_ALG_AES_CBC)) {
    mechanism = CKM_AES_CBC_PAD;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_AES_CTR)) {
    mechanism = CKM_AES_CTR;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_AES_GCM)) {
    mechanism = CKM_AES_GCM;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_AES_KW)) {
    mechanism = CKM_NSS_AES_KEY_WRAP;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_SHA1)) {
    mechanism = CKM_SHA_1;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_SHA256)) {
    mechanism = CKM_SHA256;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_SHA384)) {
    mechanism = CKM_SHA384;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_SHA512)) {
    mechanism = CKM_SHA512;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_PBKDF2)) {
    mechanism = CKM_PKCS5_PBKD2;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_RSASSA_PKCS1)) {
    mechanism = CKM_RSA_PKCS;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_RSA_OAEP)) {
    mechanism = CKM_RSA_PKCS_OAEP;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_RSA_PSS)) {
    mechanism = CKM_RSA_PKCS_PSS;
  } else if (aName.EqualsLiteral(WEBCRYPTO_ALG_ECDH)) {
    mechanism = CKM_ECDH1_DERIVE;
  }

  return mechanism;
}

#define NORMALIZED_EQUALS(aTest, aConst) \
  nsContentUtils::EqualsIgnoreASCIICase( \
      aTest, NS_LITERAL_STRING_FROM_CSTRING(aConst))

inline bool NormalizeToken(const nsString& aName, nsString& aDest) {
  // Algorithm names
  if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_AES_CBC)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_AES_CBC);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_AES_CTR)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_AES_CTR);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_AES_GCM)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_AES_GCM);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_AES_KW)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_AES_KW);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_SHA1)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_SHA1);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_SHA256)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_SHA256);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_SHA384)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_SHA384);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_SHA512)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_SHA512);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_HMAC)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_HMAC);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_HKDF)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_HKDF);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_PBKDF2)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_PBKDF2);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_RSASSA_PKCS1)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_RSASSA_PKCS1);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_RSA_OAEP)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_RSA_OAEP);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_RSA_PSS)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_RSA_PSS);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_ECDH)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_ECDH);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_ALG_ECDSA)) {
    aDest.AssignLiteral(WEBCRYPTO_ALG_ECDSA);
    // Named curve values
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_NAMED_CURVE_P256)) {
    aDest.AssignLiteral(WEBCRYPTO_NAMED_CURVE_P256);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_NAMED_CURVE_P384)) {
    aDest.AssignLiteral(WEBCRYPTO_NAMED_CURVE_P384);
  } else if (NORMALIZED_EQUALS(aName, WEBCRYPTO_NAMED_CURVE_P521)) {
    aDest.AssignLiteral(WEBCRYPTO_NAMED_CURVE_P521);
  } else {
    return false;
  }

  return true;
}

inline bool CheckEncodedECParameters(const SECItem* aEcParams) {
  // Need at least two bytes for a valid ASN.1 encoding.
  if (aEcParams->len < 2) {
    return false;
  }

  // Check the ASN.1 tag.
  if (aEcParams->data[0] != SEC_ASN1_OBJECT_ID) {
    return false;
  }

  // OID tags are short, we never need more than one length byte.
  if (aEcParams->data[1] >= 128) {
    return false;
  }

  // Check that the SECItem's length is correct.
  if (aEcParams->len != (unsigned)aEcParams->data[1] + 2) {
    return false;
  }

  return true;
}

inline SECItem* CreateECParamsForCurve(const nsAString& aNamedCurve,
                                       PLArenaPool* aArena) {
  MOZ_ASSERT(aArena);
  SECOidTag curveOIDTag;

  if (aNamedCurve.EqualsLiteral(WEBCRYPTO_NAMED_CURVE_P256)) {
    curveOIDTag = SEC_OID_SECG_EC_SECP256R1;
  } else if (aNamedCurve.EqualsLiteral(WEBCRYPTO_NAMED_CURVE_P384)) {
    curveOIDTag = SEC_OID_SECG_EC_SECP384R1;
  } else if (aNamedCurve.EqualsLiteral(WEBCRYPTO_NAMED_CURVE_P521)) {
    curveOIDTag = SEC_OID_SECG_EC_SECP521R1;
  } else {
    return nullptr;
  }

  // Retrieve curve data by OID tag.
  SECOidData* oidData = SECOID_FindOIDByTag(curveOIDTag);
  if (!oidData) {
    return nullptr;
  }

  // Create parameters.
  SECItem* params = ::SECITEM_AllocItem(aArena, nullptr, 2 + oidData->oid.len);
  if (!params) {
    return nullptr;
  }

  // Set parameters.
  params->data[0] = SEC_ASN1_OBJECT_ID;
  params->data[1] = oidData->oid.len;
  memcpy(params->data + 2, oidData->oid.data, oidData->oid.len);

  // Sanity check the params we just created.
  if (!CheckEncodedECParameters(params)) {
    return nullptr;
  }

  return params;
}

// Implemented in CryptoKey.cpp
UniqueSECKEYPublicKey CreateECPublicKey(const SECItem* aKeyData,
                                        const nsAString& aNamedCurve);

}  // namespace mozilla::dom

#endif  // mozilla_dom_WebCryptoCommon_h