version 1.64, 2005/07/25 11:59:39 |
version 1.64.2.1, 2006/02/03 03:01:56 |
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fatal("no kex alg"); |
fatal("no kex alg"); |
if (strcmp(k->name, KEX_DH1) == 0) { |
if (strcmp(k->name, KEX_DH1) == 0) { |
k->kex_type = KEX_DH_GRP1_SHA1; |
k->kex_type = KEX_DH_GRP1_SHA1; |
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k->evp_md = EVP_sha1(); |
} else if (strcmp(k->name, KEX_DH14) == 0) { |
} else if (strcmp(k->name, KEX_DH14) == 0) { |
k->kex_type = KEX_DH_GRP14_SHA1; |
k->kex_type = KEX_DH_GRP14_SHA1; |
} else if (strcmp(k->name, KEX_DHGEX) == 0) { |
k->evp_md = EVP_sha1(); |
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} else if (strcmp(k->name, KEX_DHGEX_SHA1) == 0) { |
k->kex_type = KEX_DH_GEX_SHA1; |
k->kex_type = KEX_DH_GEX_SHA1; |
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k->evp_md = EVP_sha1(); |
} else |
} else |
fatal("bad kex alg %s", k->name); |
fatal("bad kex alg %s", k->name); |
} |
} |
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static void |
static void |
choose_hostkeyalg(Kex *k, char *client, char *server) |
choose_hostkeyalg(Kex *k, char *client, char *server) |
{ |
{ |
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} |
} |
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static u_char * |
static u_char * |
derive_key(Kex *kex, int id, u_int need, u_char *hash, BIGNUM *shared_secret) |
derive_key(Kex *kex, int id, u_int need, u_char *hash, u_int hashlen, |
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BIGNUM *shared_secret) |
{ |
{ |
Buffer b; |
Buffer b; |
const EVP_MD *evp_md = EVP_sha1(); |
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EVP_MD_CTX md; |
EVP_MD_CTX md; |
char c = id; |
char c = id; |
u_int have; |
u_int have; |
int mdsz = EVP_MD_size(evp_md); |
int mdsz; |
u_char *digest; |
u_char *digest; |
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if (mdsz < 0) |
if ((mdsz = EVP_MD_size(kex->evp_md)) <= 0) |
fatal("derive_key: mdsz < 0"); |
fatal("bad kex md size %d", mdsz); |
digest = xmalloc(roundup(need, mdsz)); |
digest = xmalloc(roundup(need, mdsz)); |
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buffer_init(&b); |
buffer_init(&b); |
buffer_put_bignum2(&b, shared_secret); |
buffer_put_bignum2(&b, shared_secret); |
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/* K1 = HASH(K || H || "A" || session_id) */ |
/* K1 = HASH(K || H || "A" || session_id) */ |
EVP_DigestInit(&md, evp_md); |
EVP_DigestInit(&md, kex->evp_md); |
if (!(datafellows & SSH_BUG_DERIVEKEY)) |
if (!(datafellows & SSH_BUG_DERIVEKEY)) |
EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); |
EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); |
EVP_DigestUpdate(&md, hash, mdsz); |
EVP_DigestUpdate(&md, hash, hashlen); |
EVP_DigestUpdate(&md, &c, 1); |
EVP_DigestUpdate(&md, &c, 1); |
EVP_DigestUpdate(&md, kex->session_id, kex->session_id_len); |
EVP_DigestUpdate(&md, kex->session_id, kex->session_id_len); |
EVP_DigestFinal(&md, digest, NULL); |
EVP_DigestFinal(&md, digest, NULL); |
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* Key = K1 || K2 || ... || Kn |
* Key = K1 || K2 || ... || Kn |
*/ |
*/ |
for (have = mdsz; need > have; have += mdsz) { |
for (have = mdsz; need > have; have += mdsz) { |
EVP_DigestInit(&md, evp_md); |
EVP_DigestInit(&md, kex->evp_md); |
if (!(datafellows & SSH_BUG_DERIVEKEY)) |
if (!(datafellows & SSH_BUG_DERIVEKEY)) |
EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); |
EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); |
EVP_DigestUpdate(&md, hash, mdsz); |
EVP_DigestUpdate(&md, hash, hashlen); |
EVP_DigestUpdate(&md, digest, have); |
EVP_DigestUpdate(&md, digest, have); |
EVP_DigestFinal(&md, digest + have, NULL); |
EVP_DigestFinal(&md, digest + have, NULL); |
} |
} |
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#define NKEYS 6 |
#define NKEYS 6 |
void |
void |
kex_derive_keys(Kex *kex, u_char *hash, BIGNUM *shared_secret) |
kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen, BIGNUM *shared_secret) |
{ |
{ |
u_char *keys[NKEYS]; |
u_char *keys[NKEYS]; |
u_int i, mode, ctos; |
u_int i, mode, ctos; |
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for (i = 0; i < NKEYS; i++) |
for (i = 0; i < NKEYS; i++) { |
keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, shared_secret); |
keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, hashlen, |
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shared_secret); |
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} |
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debug2("kex_derive_keys"); |
debug2("kex_derive_keys"); |
for (mode = 0; mode < MODE_MAX; mode++) { |
for (mode = 0; mode < MODE_MAX; mode++) { |