diff options
Diffstat (limited to 'javascript/olm_pk.js')
| -rw-r--r-- | javascript/olm_pk.js | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/javascript/olm_pk.js b/javascript/olm_pk.js new file mode 100644 index 0000000..e63e907 --- /dev/null +++ b/javascript/olm_pk.js @@ -0,0 +1,179 @@ +function PkEncryption() { + var size = Module['_olm_pk_encryption_size'](); + this.buf = malloc(size); + this.ptr = Module['_olm_pk_encryption'](this.buf); +} + +function pk_encryption_method(wrapped) { + return function() { + var result = wrapped.apply(this, arguments); + if (result === OLM_ERROR) { + var message = Pointer_stringify( + Module['_olm_pk_encryption_last_error'](arguments[0]) + ); + throw new Error("OLM." + message); + } + return result; + } +} + +PkEncryption.prototype['free'] = function() { + Module['_olm_clear_pk_encryption'](this.ptr); + free(this.ptr); +} + +PkEncryption.prototype['set_recipient_key'] = restore_stack(function(key) { + var key_array = array_from_string(key); + var key_buffer = stack(key_array); + pk_encryption_method(Module['_olm_pk_encryption_set_recipient_key'])( + this.ptr, key_buffer, key_array.length + ); +}); + +PkEncryption.prototype['encrypt'] = restore_stack(function( + plaintext +) { + var plaintext_buffer, ciphertext_buffer, plaintext_length; + try { + plaintext_length = Module['lengthBytesUTF8'](plaintext) + plaintext_buffer = malloc(plaintext_length + 1); + Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1); + var random_length = pk_encryption_method( + Module['_olm_pk_encrypt_random_length'] + )(); + var random = random_stack(random_length); + var ciphertext_length = pk_encryption_method( + Module['_olm_pk_ciphertext_length'] + )(this.ptr, plaintext_length); + ciphertext_buffer = malloc(ciphertext_length + NULL_BYTE_PADDING_LENGTH); + var mac_length = pk_encryption_method( + Module['_olm_pk_mac_length'] + )(this.ptr); + var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH); + Module['setValue']( + mac_buffer+mac_length, + 0, "i8" + ); + var ephemeral_length = pk_encryption_method( + Module['_olm_pk_key_length'] + )(); + var ephemeral_buffer = stack(ephemeral_length + NULL_BYTE_PADDING_LENGTH); + Module['setValue']( + ephemeral_buffer+ephemeral_length, + 0, "i8" + ); + pk_encryption_method(Module['_olm_pk_encrypt'])( + this.ptr, + plaintext_buffer, plaintext_length, + ciphertext_buffer, ciphertext_length, + mac_buffer, mac_length, + ephemeral_buffer, ephemeral_length, + random, random_length + ); + // UTF8ToString requires a null-terminated argument, so add the + // null terminator. + Module['setValue']( + ciphertext_buffer+ciphertext_length, + 0, "i8" + ); + return { + "ciphertext": Module['UTF8ToString'](ciphertext_buffer), + "mac": Pointer_stringify(mac_buffer), + "ephemeral": Pointer_stringify(ephemeral_buffer) + }; + } finally { + if (plaintext_buffer !== undefined) { + // don't leave a copy of the plaintext in the heap. + bzero(plaintext_buffer, plaintext_length + 1); + free(plaintext_buffer); + } + if (ciphertext_buffer !== undefined) { + free(ciphertext_buffer); + } + } +}); + + +function PkDecryption() { + var size = Module['_olm_pk_decryption_size'](); + this.buf = malloc(size); + this.ptr = Module['_olm_pk_decryption'](this.buf); +} + +function pk_decryption_method(wrapped) { + return function() { + var result = wrapped.apply(this, arguments); + if (result === OLM_ERROR) { + var message = Pointer_stringify( + Module['_olm_pk_decryption_last_error'](arguments[0]) + ); + throw new Error("OLM." + message); + } + return result; + } +} + +PkDecryption.prototype['free'] = function() { + Module['_olm_clear_pk_decryption'](this.ptr); + free(this.ptr); +} + +PkDecryption.prototype['generate_key'] = restore_stack(function () { + var random_length = pk_decryption_method( + Module['_olm_pk_key_length'] // FIXME: wrong method + )(); + var random_buffer = random_stack(random_length); + var pubkey_length = pk_encryption_method( + Module['_olm_pk_key_length'] + )(); + var pubkey_buffer = stack(pubkey_length); + pk_decryption_method(Module['_olm_pk_generate_key'])( + this.ptr, + pubkey_buffer, pubkey_length, + random_buffer, random_length + ); + return Pointer_stringify(pubkey_buffer); +}); + +PkDecryption.prototype['decrypt'] = restore_stack(function ( + ephemeral_key, mac, ciphertext +) { + var plaintext_buffer, ciphertext_buffer, plaintext_max_length; + try { + ciphertext_length = Module['lengthBytesUTF8'](ciphertext) + ciphertext_buffer = malloc(ciphertext_length + 1); + Module['stringToUTF8'](ciphertext, ciphertext_buffer, ciphertext_length + 1); + var ephemeralkey_array = array_from_string(ephemeral_key); + var ephemeralkey_buffer = stack(ephemeralkey_array); + var mac_array = array_from_string(mac); + var mac_buffer = stack(mac_array); + plaintext_max_length = pk_decryption_method(Module['_olm_pk_max_plaintext_length'])( + this.ptr, + ciphertext_length + ); + plaintext_buffer = malloc(plaintext_max_length + NULL_BYTE_PADDING_LENGTH); + var plaintext_length = pk_decryption_method(Module['_olm_pk_decrypt'])( + this.ptr, + ephemeralkey_buffer, ephemeralkey_array.length, + mac_buffer, mac_array.length, + ciphertext_buffer, ciphertext_length, + plaintext_buffer, plaintext_max_length + ); + // UTF8ToString requires a null-terminated argument, so add the + // null terminator. + Module['setValue']( + plaintext_buffer+plaintext_length, + 0, "i8" + ); + return Module['UTF8ToString'](plaintext_buffer); + } finally { + if (plaintext_buffer !== undefined) { + // don't leave a copy of the plaintext in the heap. + bzero(plaintext_buffer, plaintext_length + 1); + free(plaintext_buffer); + } + if (ciphertext_buffer !== undefined) { + free(ciphertext_buffer); + } + } +}) |