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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
(cherry picked from commit 5e44c144e6)
This commit is contained in:
Andy Polyakov
2014-03-07 10:30:37 +01:00
parent fe69e6be6e
commit cc6dc9b229
2 changed files with 21 additions and 0 deletions
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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