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