From c90f36e3dd179d2de96f4f5fe38d8dc9a9de6dfe Mon Sep 17 00:00:00 2001 From: Emile Date: Fri, 25 Oct 2024 15:55:50 +0200 Subject: vendor --- .../maunium.net/go/mautrix/crypto/pkcs7/pkcs7.go | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 vendor/maunium.net/go/mautrix/crypto/pkcs7/pkcs7.go (limited to 'vendor/maunium.net/go/mautrix/crypto/pkcs7') diff --git a/vendor/maunium.net/go/mautrix/crypto/pkcs7/pkcs7.go b/vendor/maunium.net/go/mautrix/crypto/pkcs7/pkcs7.go new file mode 100644 index 0000000..dc28ed6 --- /dev/null +++ b/vendor/maunium.net/go/mautrix/crypto/pkcs7/pkcs7.go @@ -0,0 +1,30 @@ +// Copyright (c) 2024 Sumner Evans +// +// 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/. + +package pkcs7 + +import "bytes" + +// Pad implements PKCS#7 padding as defined in [RFC2315]. It pads the data to +// the given blockSize in the range [1, 255]. This is normally used in AES-CBC +// encryption. +// +// [RFC2315]: https://www.ietf.org/rfc/rfc2315.txt +func Pad(data []byte, blockSize int) []byte { + padding := blockSize - len(data)%blockSize + return append(data, bytes.Repeat([]byte{byte(padding)}, padding)...) +} + +// Unpad implements PKCS#7 unpadding as defined in [RFC2315]. It unpads the +// data by reading the padding amount from the last byte of the data. This is +// normally used in AES-CBC decryption. +// +// [RFC2315]: https://www.ietf.org/rfc/rfc2315.txt +func Unpad(data []byte) []byte { + length := len(data) + unpadding := int(data[length-1]) + return data[:length-unpadding] +} -- cgit 1.4.1