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Date: Thu, 15 Oct 2020 21:56:56 +0200
From: Tim van der Staaij <git@....vanderstaaij.email>
To: "musl" <musl@...ts.openwall.com>
Subject: [PATCH] crypt: support $2b$ prefix for blowfish
2b is functionally equivalent to 2y, i.e. no known bugs at this time.
openbsd, which created the original bcrypt implementation,
and several other implementations use this prefix since 2014:
https://marc.info/?l=openbsd-misc&m=139320023202696
---
src/crypt/crypt_blowfish.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/src/crypt/crypt_blowfish.c b/src/crypt/crypt_blowfish.c
index d3f79851..a5feffe7 100644
--- a/src/crypt/crypt_blowfish.c
+++ b/src/crypt/crypt_blowfish.c
@@ -533,6 +533,7 @@ static void BF_set_key(const char *key, BF_key expanded, BF_key initial,
* Valid combinations of settings are:
*
* Prefix "$2a$": bug = 0, safety = 0x10000
+ * Prefix "$2b$": bug = 0, safety = 0
* Prefix "$2x$": bug = 1, safety = 0
* Prefix "$2y$": bug = 0, safety = 0
*/
@@ -600,7 +601,7 @@ static char *BF_crypt(const char *key, const char *setting,
char *output, BF_word min)
{
static const unsigned char flags_by_subtype[26] =
- {2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ {2, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 0};
struct {
BF_ctx ctx;
@@ -748,7 +749,7 @@ char *__crypt_blowfish(const char *key, const char *setting, char *output)
const char *test_setting = "$2a$00$abcdefghijklmnopqrstuu";
static const char test_hash[2][34] =
{"VUrPmXD6q/nVSSp7pNDhCR9071IfIRe\0\x55", /* $2x$ */
- "i1D709vfamulimlGcq0qq3UvuUasvEa\0\x55"}; /* $2a$, $2y$ */
+ "i1D709vfamulimlGcq0qq3UvuUasvEa\0\x55"}; /* $2a$, $2b$, $2y$ */
char *retval;
const char *p;
int ok;
@@ -777,14 +778,14 @@ char *__crypt_blowfish(const char *key, const char *setting, char *output)
ok = (p == buf.o &&
!memcmp(p, buf.s, 7 + 22) &&
!memcmp(p + (7 + 22),
- test_hash[buf.s[2] & 1],
+ test_hash[buf.s[2] != 'x'],
31 + 1 + 1 + 1));
{
const char *k = "\xff\xa3" "34" "\xff\xff\xff\xa3" "345";
BF_key ae, ai, ye, yi;
BF_set_key(k, ae, ai, 2); /* $2a$ */
- BF_set_key(k, ye, yi, 4); /* $2y$ */
+ BF_set_key(k, ye, yi, 4); /* $2b$, $2y$ */
ai[0] ^= 0x10000; /* undo the safety (for comparison) */
ok = ok && ai[0] == 0xdb9c59bc && ye[17] == 0x33343500 &&
!memcmp(ae, ye, sizeof(ae)) &&
--
2.23.0
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