// SPDX-License-Identifier: GPL-2.0 /* * base64.c - RFC4648-compliant base64 encoding * * Copyright (c) 2020 Hannes Reinecke, SUSE * * Based on the base64url routines from fs/crypto/fname.c * (which are using the URL-safe base64 encoding), * modified to use the standard coding table from RFC4648 section 4. */ #include <linux/kernel.h> #include <linux/types.h> #include <linux/export.h> #include <linux/string.h> #include <linux/base64.h> static const char base64_table[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /** * base64_encode() - base64-encode some binary data * @src: the binary data to encode * @srclen: the length of @src in bytes * @dst: (output) the base64-encoded string. Not NUL-terminated. * * Encodes data using base64 encoding, i.e. the "Base 64 Encoding" specified * by RFC 4648, including the '='-padding. * * Return: the length of the resulting base64-encoded string in bytes. */ int base64_encode(const u8 *src, int srclen, char *dst) { u32 ac = 0; int bits = 0; int i; char *cp = dst; for (i = 0; i < srclen; i++) { ac = (ac << 8) | src[i]; bits += 8; do { bits -= 6; *cp++ = base64_table[(ac >> bits) & 0x3f]; } while (bits >= 6); } if (bits) { *cp++ = base64_table[(ac << (6 - bits)) & 0x3f]; bits -= 6; } while (bits < 0) { *cp++ = '='; bits += 2; } return cp - dst; } EXPORT_SYMBOL_GPL(base64_encode); /** * base64_decode() - base64-decode a string * @src: the string to decode. Doesn't need to be NUL-terminated. * @srclen: the length of @src in bytes * @dst: (output) the decoded binary data * * Decodes a string using base64 encoding, i.e. the "Base 64 Encoding" * specified by RFC 4648, including the '='-padding. * * This implementation hasn't been optimized for performance. * * Return: the length of the resulting decoded binary data in bytes, * or -1 if the string isn't a valid base64 string. */ int base64_decode(const char *src, int srclen, u8 *dst) { u32 ac = 0; int bits = 0; int i; u8 *bp = dst; for (i = 0; i < srclen; i++) { const char *p = strchr(base64_table, src[i]); if (src[i] == '=') { ac = (ac << 6); bits += 6; if (bits >= 8) bits -= 8; continue; } if (p == NULL || src[i] == 0) return -1; ac = (ac << 6) | (p - base64_table); bits += 6; if (bits >= 8) { bits -= 8; *bp++ = (u8)(ac >> bits); } } if (ac & ((1 << bits) - 1)) return -1; return bp - dst; } EXPORT_SYMBOL_GPL(base64_decode);