busybox/libbb/yescrypt/README
Denys Vlasenko 80e676664e libbb: add yescrypt password hashing support
It seems to work, but not at all optimized for size.
The extra copy of sha256 code need to be removed.

The yescrypt code in libbb/yescrypt/* is adapted from libxcrypt-4.4.38
with minimal edits, hopefully making it easier to track
backports by resetting the tree to this commit,
then comparing changes in upstream libxcrypt to the tree.

function                                             old     new   delta
blockmix_xor_save                                      -    7050   +7050
static.blockmix_xor                                    -    6475   +6475
blockmix                                               -    3390   +3390
SHA256_Transform                                       -    3083   +3083
yescrypt_kdf_body                                      -    1724   +1724
PBKDF2_SHA256                                          -    1003   +1003
smix1                                                  -     960    +960
yescrypt_r                                             -     890    +890
salsa20                                                -     804    +804
smix                                                   -     790    +790
smix2                                                  -     659    +659
blockmix_salsa8_xor                                    -     601    +601
yescrypt_kdf                                           -     479    +479
blockmix_salsa8                                        -     415    +415
Krnd                                                   -     256    +256
_HMAC_SHA256_Init                                      -     213    +213
_SHA256_Update                                         -     198    +198
_SHA256_Final                                          -     195    +195
decode64_uint32                                        -     166    +166
encode64                                               -     153    +153
decode64                                               -     136    +136
libcperciva_HMAC_SHA256_Buf                            -     132    +132
SHA256_Pad_Almost                                      -     131    +131
salsa20_simd_unshuffle                                 -     101    +101
salsa20_simd_shuffle                                   -     101    +101
yes_crypt                                              -      90     +90
libcperciva_SHA256_Buf                                 -      86     +86
crypt_make_rand64encoded                               -      85     +85
static.atoi64_partial                                  -      77     +77
alloc_region                                           -      72     +72
ascii64                                                -      65     +65
PAD                                                    -      64     +64
_HMAC_SHA256_Final                                     -      55     +55
static.cpu_to_be32_vect                                -      51     +51
free_region                                            -      47     +47
libcperciva_SHA256_Init                                -      37     +37
yescrypt_init_local                                    -      34     +34
crypt_make_pw_salt                                    92     125     +33
initial_state                                          -      32     +32
.rodata                                           105771  105803     +32
atoi64                                                 -      25     +25
explicit_bzero                                         -      22     +22
pw_encrypt                                           920     941     +21
yescrypt_free_local                                    -       9      +9
crypt_make_salt                                       85       -     -85
------------------------------------------------------------------------------
(add/remove: 43/1 grow/shrink: 3/0 up/down: 31042/-85)      Total: 30957 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2025-07-06 00:49:22 +02:00

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Text

The yescrypt code in this directory is adapted from libxcrypt-4.4.38
with minimal edits, hopefully making it easier to track
backports by resetting the tree to the commit which created this file,
then comparing changes in upstream libxcrypt to the tree.