From a116e1cdc64a743c36c40e6fa639dec991c157a3 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Mon, 27 Jun 2022 11:51:59 +0200 Subject: lib/base64: RFC4648-compliant base64 encoding Add RFC4648-compliant base64 encoding and decoding routines, based on the base64url encoding in fs/crypto/fname.c. Signed-off-by: Hannes Reinecke Reviewed-by: Himanshu Madhani Reviewed-by: Sagi Grimberg Cc: Eric Biggers Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- lib/Makefile | 2 +- lib/base64.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 104 insertions(+), 1 deletion(-) create mode 100644 lib/base64.c (limited to 'lib') diff --git a/lib/Makefile b/lib/Makefile index f99bf61f8bbc..20d2caf6577d 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -46,7 +46,7 @@ obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \ bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \ list_sort.o uuid.o iov_iter.o clz_ctz.o \ bsearch.o find_bit.o llist.o memweight.o kfifo.o \ - percpu-refcount.o rhashtable.o \ + percpu-refcount.o rhashtable.o base64.o \ once.o refcount.o usercopy.o errseq.o bucket_locks.o \ generic-radix-tree.o obj-$(CONFIG_STRING_SELFTEST) += test_string.o diff --git a/lib/base64.c b/lib/base64.c new file mode 100644 index 000000000000..b736a7a431c5 --- /dev/null +++ b/lib/base64.c @@ -0,0 +1,103 @@ +// 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 +#include +#include +#include +#include + +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); -- cgit v1.2.3-58-ga151