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enable aes-ctr ciphers use the EVP engines from OpenSSL such as the AES-NI

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This commit is contained in:
Tomas Mraz 2012-01-11 19:11:33 +01:00
parent 2e12878998
commit 6148abd585
2 changed files with 108 additions and 2 deletions
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101
openssh-5.9p1-ctr-evp-fast.patch Normal file
View File

@ -0,0 +1,101 @@
diff -up openssh-5.9p1/cipher-ctr.c.ctr-evp openssh-5.9p1/cipher-ctr.c
--- openssh-5.9p1/cipher-ctr.c.ctr-evp 2012-01-11 09:24:06.000000000 +0100
+++ openssh-5.9p1/cipher-ctr.c 2012-01-11 15:54:04.675956600 +0100
@@ -38,7 +38,7 @@ void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, in
struct ssh_aes_ctr_ctx
{
- AES_KEY aes_ctx;
+ EVP_CIPHER_CTX ecbctx;
u_char aes_counter[AES_BLOCK_SIZE];
};
@@ -63,21 +63,42 @@ ssh_aes_ctr(EVP_CIPHER_CTX *ctx, u_char
{
struct ssh_aes_ctr_ctx *c;
size_t n = 0;
- u_char buf[AES_BLOCK_SIZE];
+ u_char ctrbuf[AES_BLOCK_SIZE*256];
+ u_char buf[AES_BLOCK_SIZE*256];
if (len == 0)
return (1);
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL)
return (0);
- while ((len--) > 0) {
+ for (; len > 0; len -= sizeof(u_int)) {
+ u_int r,a,b;
+
if (n == 0) {
- AES_encrypt(c->aes_counter, buf, &c->aes_ctx);
- ssh_ctr_inc(c->aes_counter, AES_BLOCK_SIZE);
+ int outl, i, buflen;
+
+ buflen = MIN(len, sizeof(ctrbuf));
+
+ for(i = 0; i < buflen; i += AES_BLOCK_SIZE) {
+ memcpy(&ctrbuf[i], c->aes_counter, AES_BLOCK_SIZE);
+ ssh_ctr_inc(c->aes_counter, AES_BLOCK_SIZE);
+ }
+
+ EVP_EncryptUpdate(&c->ecbctx, buf, &outl,
+ ctrbuf, buflen);
}
- *(dest++) = *(src++) ^ buf[n];
- n = (n + 1) % AES_BLOCK_SIZE;
+
+ memcpy(&a, src, sizeof(a));
+ memcpy(&b, &buf[n], sizeof(b));
+ r = a ^ b;
+ memcpy(dest, &r, sizeof(r));
+ src += sizeof(a);
+ dest += sizeof(r);
+
+ n = (n + sizeof(b)) % sizeof(buf);
}
+ memset(ctrbuf, '\0', sizeof(ctrbuf));
+ memset(buf, '\0', sizeof(buf));
return (1);
}
@@ -91,9 +112,28 @@ ssh_aes_ctr_init(EVP_CIPHER_CTX *ctx, co
c = xmalloc(sizeof(*c));
EVP_CIPHER_CTX_set_app_data(ctx, c);
}
- if (key != NULL)
- AES_set_encrypt_key(key, EVP_CIPHER_CTX_key_length(ctx) * 8,
- &c->aes_ctx);
+
+ EVP_CIPHER_CTX_init(&c->ecbctx);
+
+ if (key != NULL) {
+ const EVP_CIPHER *cipher;
+ switch(EVP_CIPHER_CTX_key_length(ctx)*8) {
+ case 128:
+ cipher = EVP_aes_128_ecb();
+ break;
+ case 192:
+ cipher = EVP_aes_192_ecb();
+ break;
+ case 256:
+ cipher = EVP_aes_256_ecb();
+ break;
+ default:
+ fatal("ssh_aes_ctr_init: wrong aes key length");
+ }
+ if(!EVP_EncryptInit_ex(&c->ecbctx, cipher, NULL, key, NULL))
+ fatal("ssh_aes_ctr_init: cannot initialize aes encryption");
+ EVP_CIPHER_CTX_set_padding(&c->ecbctx, 0);
+ }
if (iv != NULL)
memcpy(c->aes_counter, iv, AES_BLOCK_SIZE);
return (1);
@@ -105,6 +145,7 @@ ssh_aes_ctr_cleanup(EVP_CIPHER_CTX *ctx)
struct ssh_aes_ctr_ctx *c;
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
+ EVP_CIPHER_CTX_cleanup(&c->ecbctx);
memset(c, 0, sizeof(*c));
xfree(c);
EVP_CIPHER_CTX_set_app_data(ctx, NULL);

9
openssh.spec
View File

@ -75,7 +75,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%define openssh_ver 5.9p1
%define openssh_rel 14
%define openssh_rel 15
%define pam_ssh_agent_ver 0.9.2
%define pam_ssh_agent_rel 32
@ -196,7 +196,8 @@ Patch709: openssh-5.9p1-vendor.patch
Patch710: openssh-5.9p1-copy-id-restorecon.patch
# warn users for unsupported UsePAM=no (#757545)
Patch711: openssh-5.9p1-log-usepam-no.patch
# make aes-ctr ciphers use EVP engines such as AES-NI from OpenSSL
Patch712: openssh-5.9p1-ctr-evp-fast.patch
#http://www.sxw.org.uk/computing/patches/openssh.html
Patch800: openssh-5.9p1-gsskex.patch
@ -444,6 +445,7 @@ popd
%patch709 -p1 -b .vendor
%patch710 -p1 -b .restorecon
%patch711 -p1 -b .log-usepam-no
%patch712 -p1 -b .evp-ctr
%patch800 -p1 -b .gsskex
%patch801 -p1 -b .force_krb
@ -789,6 +791,9 @@ fi
%endif
%changelog
* Tue Dec 06 2011 Tomas Mraz <tmraz@redhat.com> 5.9p1-15 + 0.9.2-32
- enable aes-ctr ciphers use the EVP engines from OpenSSL such as the AES-NI
* Tue Dec 06 2011 Petr Lautrbach <plautrba@redhat.com> 5.9p1-14 + 0.9.2-32
- warn about unsupported option UsePAM=no (#757545)