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WasmThemis: Secure Message support #490
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// Copyright (c) 2019 Cossack Labs Limited | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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/** | ||
* @file | ||
* Themis Secure Message. | ||
*/ | ||
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const libthemis = require('./libthemis.js') | ||
const keygen = require('./secure_keygen.js') | ||
const errors = require('./themis_error.js') | ||
const utils = require('./utils.js') | ||
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const cryptosystem_name = 'SecureMessage' | ||
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const ThemisError = errors.ThemisError | ||
const ThemisErrorCode = errors.ThemisErrorCode | ||
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class SecureMessage { | ||
constructor(keyPair) { | ||
if (arguments.length == 1) { | ||
if (!(keyPair instanceof keygen.KeyPair)) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'invalid argument: must be KeyPair') | ||
} | ||
this.privateKey = keyPair.privateKey | ||
this.publicKey = keyPair.publicKey | ||
return | ||
} | ||
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if (arguments.length == 2) { | ||
let arg0isPrivateKey = arguments[0] instanceof keygen.PrivateKey | ||
let arg0isPublicKey = arguments[0] instanceof keygen.PublicKey | ||
let arg1isPrivateKey = arguments[1] instanceof keygen.PrivateKey | ||
let arg1isPublicKey = arguments[1] instanceof keygen.PublicKey | ||
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if (arg0isPublicKey && arg1isPrivateKey) { | ||
this.publicKey = arguments[0] | ||
this.privateKey = arguments[1] | ||
return | ||
} | ||
if (arg0isPrivateKey && arg1isPublicKey) { | ||
this.privateKey = arguments[0] | ||
this.publicKey = arguments[1] | ||
return | ||
} | ||
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throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'invalid arguments: expected PrivateKey and PublicKey') | ||
} | ||
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throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'invalid argument count: expected either one KeyPair, or PrivateKey and PublicKey') | ||
} | ||
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encrypt(message) { | ||
message = utils.coerceToBytes(message) | ||
if (message.length == 0) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'message must be not empty') | ||
} | ||
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let status | ||
/// C API uses "size_t" for lengths, it's defined as "i32" in Emscripten | ||
let result_length_ptr = libthemis.allocate(4, 'i32', libthemis.ALLOC_STACK) | ||
let private_key_ptr, public_key_ptr, message_ptr, result_ptr, result_length | ||
try { | ||
private_key_ptr = libthemis._malloc(this.privateKey.length) | ||
public_key_ptr = libthemis._malloc(this.publicKey.length) | ||
message_ptr = libthemis._malloc(message.length) | ||
if (!private_key_ptr || !public_key_ptr || !message_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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libthemis.writeArrayToMemory(this.privateKey, private_key_ptr) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. clean up in case of error (this case and similar) |
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libthemis.writeArrayToMemory(this.publicKey, public_key_ptr) | ||
libthemis.writeArrayToMemory(message, message_ptr) | ||
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status = libthemis._themis_secure_message_encrypt( | ||
private_key_ptr, this.privateKey.length, | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
null, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.BUFFER_TOO_SMALL) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
result_ptr = libthemis._malloc(result_length) | ||
if (!result_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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status = libthemis._themis_secure_message_encrypt( | ||
private_key_ptr, this.privateKey.length, | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
result_ptr, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.SUCCESS) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
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return libthemis.HEAPU8.slice(result_ptr, result_ptr + result_length) | ||
} | ||
finally { | ||
libthemis._memset(private_key_ptr, 0, this.privateKey.length) | ||
libthemis._free(private_key_ptr) | ||
libthemis._free(public_key_ptr) | ||
libthemis._free(message_ptr) | ||
libthemis._free(result_ptr) | ||
} | ||
} | ||
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decrypt(message) { | ||
message = utils.coerceToBytes(message) | ||
if (message.length == 0) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'message must be not empty') | ||
} | ||
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let status | ||
/// C API uses "size_t" for lengths, it's defined as "i32" in Emscripten | ||
let result_length_ptr = libthemis.allocate(4, 'i32', libthemis.ALLOC_STACK) | ||
let private_key_ptr, public_key_ptr, message_ptr, result_ptr, result_length | ||
try { | ||
private_key_ptr = libthemis._malloc(this.privateKey.length) | ||
public_key_ptr = libthemis._malloc(this.publicKey.length) | ||
message_ptr = libthemis._malloc(message.length) | ||
if (!private_key_ptr || !public_key_ptr || !message_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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libthemis.writeArrayToMemory(this.privateKey, private_key_ptr) | ||
libthemis.writeArrayToMemory(this.publicKey, public_key_ptr) | ||
libthemis.writeArrayToMemory(message, message_ptr) | ||
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status = libthemis._themis_secure_message_decrypt( | ||
private_key_ptr, this.privateKey.length, | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
null, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.BUFFER_TOO_SMALL) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
result_ptr = libthemis._malloc(result_length) | ||
if (!result_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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status = libthemis._themis_secure_message_decrypt( | ||
private_key_ptr, this.privateKey.length, | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
result_ptr, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.SUCCESS) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
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return libthemis.HEAPU8.slice(result_ptr, result_ptr + result_length) | ||
} | ||
finally { | ||
libthemis._memset(private_key_ptr, 0, this.privateKey.length) | ||
libthemis._free(private_key_ptr) | ||
libthemis._free(public_key_ptr) | ||
libthemis._free(message_ptr) | ||
libthemis._free(result_ptr) | ||
} | ||
} | ||
} | ||
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class SecureMessageSign { | ||
constructor(privateKey) { | ||
if (!(privateKey instanceof keygen.PrivateKey)) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'invalid argument: expected PrivateKey') | ||
} | ||
this.privateKey = privateKey | ||
} | ||
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sign(message) { | ||
message = utils.coerceToBytes(message) | ||
if (message.length == 0) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'message must be not empty') | ||
} | ||
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let status | ||
/// C API uses "size_t" for lengths, it's defined as "i32" in Emscripten | ||
let result_length_ptr = libthemis.allocate(4, 'i32', libthemis.ALLOC_STACK) | ||
let private_key_ptr, message_ptr, result_ptr, result_length | ||
try { | ||
private_key_ptr = libthemis._malloc(this.privateKey.length) | ||
message_ptr = libthemis._malloc(message.length) | ||
if (!private_key_ptr || !message_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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libthemis.writeArrayToMemory(this.privateKey, private_key_ptr) | ||
libthemis.writeArrayToMemory(message, message_ptr) | ||
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status = libthemis._themis_secure_message_sign( | ||
private_key_ptr, this.privateKey.length, | ||
message_ptr, message.length, | ||
null, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.BUFFER_TOO_SMALL) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
result_ptr = libthemis._malloc(result_length) | ||
if (!result_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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status = libthemis._themis_secure_message_sign( | ||
private_key_ptr, this.privateKey.length, | ||
message_ptr, message.length, | ||
result_ptr, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.SUCCESS) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
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return libthemis.HEAPU8.slice(result_ptr, result_ptr + result_length) | ||
} | ||
finally { | ||
libthemis._memset(private_key_ptr, 0, this.privateKey.length) | ||
libthemis._free(private_key_ptr) | ||
libthemis._free(message_ptr) | ||
libthemis._free(result_ptr) | ||
} | ||
} | ||
} | ||
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class SecureMessageVerify { | ||
constructor(publicKey) { | ||
if (!(publicKey instanceof keygen.PublicKey)) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'invalid argument: expected PublicKey') | ||
} | ||
this.publicKey = publicKey | ||
} | ||
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verify(message) { | ||
message = utils.coerceToBytes(message) | ||
if (message.length == 0) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.INVALID_PARAMETER, | ||
'message must be not empty') | ||
} | ||
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let status | ||
/// C API uses "size_t" for lengths, it's defined as "i32" in Emscripten | ||
let result_length_ptr = libthemis.allocate(4, 'i32', libthemis.ALLOC_STACK) | ||
let public_key_ptr, message_ptr, result_ptr, result_length | ||
try { | ||
public_key_ptr = libthemis._malloc(this.publicKey.length) | ||
message_ptr = libthemis._malloc(message.length) | ||
if (!public_key_ptr || !message_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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libthemis.writeArrayToMemory(this.publicKey, public_key_ptr) | ||
libthemis.writeArrayToMemory(message, message_ptr) | ||
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status = libthemis._themis_secure_message_verify( | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
null, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.BUFFER_TOO_SMALL) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
result_ptr = libthemis._malloc(result_length) | ||
if (!result_ptr) { | ||
throw new ThemisError(cryptosystem_name, ThemisErrorCode.NO_MEMORY) | ||
} | ||
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status = libthemis._themis_secure_message_verify( | ||
public_key_ptr, this.publicKey.length, | ||
message_ptr, message.length, | ||
result_ptr, result_length_ptr | ||
) | ||
if (status != ThemisErrorCode.SUCCESS) { | ||
throw new ThemisError(cryptosystem_name, status) | ||
} | ||
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result_length = libthemis.getValue(result_length_ptr, 'i32') | ||
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return libthemis.HEAPU8.slice(result_ptr, result_ptr + result_length) | ||
} | ||
finally { | ||
libthemis._free(public_key_ptr) | ||
libthemis._free(message_ptr) | ||
libthemis._free(result_ptr) | ||
} | ||
} | ||
} | ||
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module.exports.SecureMessage = SecureMessage | ||
module.exports.SecureMessageSign = SecureMessageSign | ||
module.exports.SecureMessageVerify = SecureMessageVerify |
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it's so cute) you allow users to use any order of params))
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that's really cool, i hope it will improve usability, not add confusion :D