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') | ||
| } | ||
|
|
||
| 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. 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