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SPARC T4 assembly pack: treat zero input length in CBC.

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The problem is that OpenSSH calls EVP_Cipher, which is not as
protective as EVP_CipherUpdate. Formally speaking we ought to
do more checks in *_cipher methods, including rejecting
lengths not divisible by block size (unless ciphertext stealing
is in place). But for now I implement check for zero length in
low-level based on precedent.

PR: 3087, 2775
This commit is contained in:
Andy Polyakov 2014-03-07 10:30:37 +01:00
parent 53e5161231
commit 5e44c144e6
2 changed files with 21 additions and 0 deletions
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15
crypto/des/asm/dest4-sparcv9.pl
View File

@ -94,6 +94,9 @@ $code.=<<___;
.globl des_t4_cbc_encrypt
.align 32
des_t4_cbc_encrypt:
cmp $len, 0
be,pn $::size_t_cc, .Lcbc_abort
nop
ld [$ivec + 0], %f0 ! load ivec
ld [$ivec + 4], %f1
@ -165,6 +168,9 @@ des_t4_cbc_encrypt:
st %f0, [$ivec + 0] ! write out ivec
retl
st %f1, [$ivec + 4]
.Lcbc_abort:
retl
nop
.align 16
2: ldxa [$inp]0x82, %g4 ! avoid read-after-write hazard
@ -189,6 +195,9 @@ des_t4_cbc_encrypt:
.globl des_t4_cbc_decrypt
.align 32
des_t4_cbc_decrypt:
cmp $len, 0
be,pn $::size_t_cc, .Lcbc_abort
nop
ld [$ivec + 0], %f2 ! load ivec
ld [$ivec + 4], %f3
@ -294,6 +303,9 @@ $code.=<<___;
.globl des_t4_ede3_cbc_encrypt
.align 32
des_t4_ede3_cbc_encrypt:
cmp $len, 0
be,pn $::size_t_cc, .Lcbc_abort
nop
ld [$ivec + 0], %f0 ! load ivec
ld [$ivec + 4], %f1
@ -443,6 +455,9 @@ des_t4_ede3_cbc_encrypt:
.globl des_t4_ede3_cbc_decrypt
.align 32
des_t4_ede3_cbc_decrypt:
cmp $len, 0
be,pn $::size_t_cc, .Lcbc_abort
nop
ld [$ivec + 0], %f2 ! load ivec
ld [$ivec + 4], %f3

6
crypto/perlasm/sparcv9_modes.pl
View File

@ -35,6 +35,8 @@ $::code.=<<___;
.align 32
${alg}${bits}_t4_cbc_encrypt:
save %sp, -$::frame, %sp
cmp $len, 0
be,pn $::size_t_cc, .L${bits}_cbc_enc_abort
sub $inp, $out, $blk_init ! $inp!=$out
___
$::code.=<<___ if (!$::evp);
@ -123,6 +125,7 @@ $::code.=<<___ if (!$::evp);
std %f2, [$ivec + 8]
___
$::code.=<<___;
.L${bits}_cbc_enc_abort:
ret
restore
@ -249,6 +252,8 @@ $::code.=<<___;
.align 32
${alg}${bits}_t4_cbc_decrypt:
save %sp, -$::frame, %sp
cmp $len, 0
be,pn $::size_t_cc, .L${bits}_cbc_dec_abort
sub $inp, $out, $blk_init ! $inp!=$out
___
$::code.=<<___ if (!$::evp);
@ -341,6 +346,7 @@ $::code.=<<___ if (!$::evp);
std %f14, [$ivec + 8]
___
$::code.=<<___;
.L${bits}_cbc_dec_abort:
ret
restore