1 #define _WIN32_WINNT 0x0400
8 void fatalbox(char *fmt
, ...);
10 static HCRYPTKEY
create_des_key(unsigned char *key
);
13 HCRYPTPROV hCryptProv
;
14 HCRYPTKEY hDESKey
[2][3] = {{0,0,0},{0,0,0}}; /* global for now */
17 /* use Microsoft Enhanced Cryptographic Service Provider */
18 #define CSP MS_ENHANCED_PROV
21 static BYTE PrivateKeyWithExponentOfOne
[] =
23 0x07, 0x02, 0x00, 0x00, 0x00, 0xA4, 0x00, 0x00,
24 0x52, 0x53, 0x41, 0x32, 0x00, 0x02, 0x00, 0x00,
25 0x01, 0x00, 0x00, 0x00, 0xAB, 0xEF, 0xFA, 0xC6,
26 0x7D, 0xE8, 0xDE, 0xFB, 0x68, 0x38, 0x09, 0x92,
27 0xD9, 0x42, 0x7E, 0x6B, 0x89, 0x9E, 0x21, 0xD7,
28 0x52, 0x1C, 0x99, 0x3C, 0x17, 0x48, 0x4E, 0x3A,
29 0x44, 0x02, 0xF2, 0xFA, 0x74, 0x57, 0xDA, 0xE4,
30 0xD3, 0xC0, 0x35, 0x67, 0xFA, 0x6E, 0xDF, 0x78,
31 0x4C, 0x75, 0x35, 0x1C, 0xA0, 0x74, 0x49, 0xE3,
32 0x20, 0x13, 0x71, 0x35, 0x65, 0xDF, 0x12, 0x20,
33 0xF5, 0xF5, 0xF5, 0xC1, 0xED, 0x5C, 0x91, 0x36,
34 0x75, 0xB0, 0xA9, 0x9C, 0x04, 0xDB, 0x0C, 0x8C,
35 0xBF, 0x99, 0x75, 0x13, 0x7E, 0x87, 0x80, 0x4B,
36 0x71, 0x94, 0xB8, 0x00, 0xA0, 0x7D, 0xB7, 0x53,
37 0xDD, 0x20, 0x63, 0xEE, 0xF7, 0x83, 0x41, 0xFE,
38 0x16, 0xA7, 0x6E, 0xDF, 0x21, 0x7D, 0x76, 0xC0,
39 0x85, 0xD5, 0x65, 0x7F, 0x00, 0x23, 0x57, 0x45,
40 0x52, 0x02, 0x9D, 0xEA, 0x69, 0xAC, 0x1F, 0xFD,
41 0x3F, 0x8C, 0x4A, 0xD0,
43 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53 0x64, 0xD5, 0xAA, 0xB1,
54 0xA6, 0x03, 0x18, 0x92, 0x03, 0xAA, 0x31, 0x2E,
55 0x48, 0x4B, 0x65, 0x20, 0x99, 0xCD, 0xC6, 0x0C,
56 0x15, 0x0C, 0xBF, 0x3E, 0xFF, 0x78, 0x95, 0x67,
57 0xB1, 0x74, 0x5B, 0x60,
59 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
66 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
71 /* ---------------------------------------------------------*
73 * ---------------------------------------------------------*/
76 int crypto_startup() {
77 if(CryptAcquireContext(&hCryptProv
, "Putty", CSP
, PROV_RSA_FULL
,
78 CRYPT_NEWKEYSET
) == 0) {
79 if(GetLastError() == NTE_EXISTS
) {
80 if(CryptAcquireContext(&hCryptProv
, "Putty", CSP
,
81 PROV_RSA_FULL
, 0) == 0) {
82 return FALSE
; /* failed to acquire context - probably
83 * don't have high encryption installed! */
86 return FALSE
; /* failed to acquire context - probably
87 * don't have high encryption installed! */
93 void crypto_wrapup() {
98 CryptDestroyKey(hDESKey
[i
][j
]);
103 CryptReleaseContext(hCryptProv
, 0);
108 /* ---------------------------------------------------------*
109 * Random number functions *
110 * ---------------------------------------------------------*/
112 int random_byte(void) {
114 if(!CryptGenRandom(hCryptProv
, 1, &b
))
115 fatalbox("random number generator failure!");
119 void random_add_noise(void *noise
, int length
) {
122 void random_init(void) {
125 void random_get_savedata(void **data
, int *len
) {
128 void noise_get_heavy(void (*func
) (void *, int)) {
131 void noise_get_light(void (*func
) (void *, int)) {
134 void noise_ultralight(DWORD data
) {
137 void random_save_seed(void) {
142 /* ---------------------------------------------------------*
143 * MD5 hash functions *
144 * ---------------------------------------------------------*/
147 void MD5Init(struct MD5Context
*ctx
) {
148 if(!CryptCreateHash(hCryptProv
, CALG_MD5
, 0, 0, &ctx
->hHash
))
149 fatalbox("Error during CryptBeginHash!\n");
153 void MD5Update(struct MD5Context
*ctx
,
154 unsigned char const *buf
, unsigned len
) {
155 if(CryptHashData(ctx
->hHash
, buf
, len
, 0) == 0)
156 fatalbox("Error during CryptHashSessionKey!\n");
160 void MD5Final(unsigned char digest
[16], struct MD5Context
*ctx
) {
162 if(CryptGetHashParam(ctx
->hHash
, HP_HASHVAL
, digest
, &cb
, 0) == 0)
163 fatalbox("Error during CryptGetHashParam!\n");
165 CryptDestroyHash(ctx
->hHash
);
170 /* ---------------------------------------------------------*
171 * RSA public key functions *
172 * ---------------------------------------------------------*/
174 int makekey(unsigned char *data
, struct RSAKey
*result
,
175 unsigned char **keystr
) {
177 unsigned char *p
= data
;
181 /* get size (bits) of modulus */
184 result
->bits
= (result
->bits
<< 8) + *p
++;
186 /* get size (bits) of public exponent */
190 b
= (w
+7)/8; /* bits -> bytes */
192 /* convert exponent to DWORD */
193 result
->exponent
= 0;
195 result
->exponent
= (result
->exponent
<< 8) + *p
++;
197 /* get size (bits) of modulus */
201 result
->bytes
= b
= (w
+7)/8; /* bits -> bytes */
203 /* allocate buffer for modulus & copy it */
204 result
->modulus
= malloc(b
);
205 memcpy(result
->modulus
, p
, b
);
207 /* update callers pointer */
208 if (keystr
) *keystr
= p
; /* point at key string, second time */
210 return (p
- data
) + b
;
214 void rsaencrypt(unsigned char *data
, int length
, struct RSAKey
*rsakey
) {
217 unsigned char *pKeybuf
, *pKeyin
;
219 PUBLICKEYSTRUC
*pBlob
;
225 /* allocate buffer for public key blob */
226 if((pBlob
= malloc(sizeof(PUBLICKEYSTRUC
) + sizeof(RSAPUBKEY
) +
227 rsakey
->bytes
)) == NULL
)
228 fatalbox("Out of memory");
230 /* allocate buffer for message encryption block */
231 bufsize
= (length
+ rsakey
->bytes
) << 1;
232 if((buf
= malloc(bufsize
)) == NULL
)
233 fatalbox("Out of memory");
235 /* construct public key blob from host public key */
236 pKeybuf
= ((unsigned char*)pBlob
) + sizeof(PUBLICKEYSTRUC
) +
238 pKeyin
= ((unsigned char*)rsakey
->modulus
);
239 /* change big endian to little endian */
240 for(i
=0; i
<rsakey
->bytes
; i
++)
241 pKeybuf
[i
] = pKeyin
[rsakey
->bytes
-i
-1];
242 pBlob
->bType
= PUBLICKEYBLOB
;
243 pBlob
->bVersion
= 0x02;
245 pBlob
->aiKeyAlg
= CALG_RSA_KEYX
;
246 pRPK
= (RSAPUBKEY
*)(((unsigned char*)pBlob
) + sizeof(PUBLICKEYSTRUC
));
247 pRPK
->magic
= 0x31415352; /* "RSA1" */
248 pRPK
->bitlen
= rsakey
->bits
;
249 pRPK
->pubexp
= rsakey
->exponent
;
251 /* import public key blob into key container */
252 if(CryptImportKey(hCryptProv
, (void*)pBlob
,
253 sizeof(PUBLICKEYSTRUC
)+sizeof(RSAPUBKEY
)+rsakey
->bytes
,
254 0, 0, &hRsaKey
) == 0)
255 fatalbox("Error importing RSA key!");
257 /* copy message into buffer */
258 memcpy(buf
, data
, length
);
261 /* using host public key, encrypt the message */
262 if(CryptEncrypt(hRsaKey
, 0, TRUE
, 0, buf
, &dlen
, bufsize
) == 0)
263 fatalbox("Error encrypting using RSA key!");
266 * For some strange reason, Microsoft CryptEncrypt using public
267 * key, returns the cyphertext in backwards (little endian)
268 * order, so reverse it!
270 for(i
= 0; i
< (int)dlen
; i
++)
271 data
[i
] = buf
[dlen
- i
- 1]; /* make it big endian */
273 CryptDestroyKey(hRsaKey
);
280 int rsastr_len(struct RSAKey
*key
) {
281 return 2 * (sizeof(DWORD
) + key
->bytes
) + 10;
285 void rsastr_fmt(char *str
, struct RSAKey
*key
) {
289 sprintf(str
+len
, "%04x", key
->exponent
);
290 len
+= strlen(str
+len
);
293 for (i
=1; i
<key
->bytes
; i
++) {
294 sprintf(str
+len
, "%02x", key
->modulus
[i
]);
295 len
+= strlen(str
+len
);
302 /* ---------------------------------------------------------*
303 * DES encryption / decryption functions *
304 * ---------------------------------------------------------*/
307 void des3_sesskey(unsigned char *key
) {
309 for(i
= 0; i
< 2; i
++) {
310 for(j
= 0; j
< 3; j
++) {
311 hDESKey
[i
][j
] = create_des_key(key
+ (j
* 8));
317 void des3_encrypt_blk(unsigned char *blk
, int len
) {
322 if(CryptEncrypt(hDESKey
[0][0], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
323 fatalbox("Error encrypting block!\n");
324 if(CryptDecrypt(hDESKey
[0][1], 0, FALSE
, 0, blk
, &dlen
) == 0)
325 fatalbox("Error encrypting block!\n");
326 if(CryptEncrypt(hDESKey
[0][2], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
327 fatalbox("Error encrypting block!\n");
331 void des3_decrypt_blk(unsigned char *blk
, int len
) {
335 if(CryptDecrypt(hDESKey
[1][2], 0, FALSE
, 0, blk
, &dlen
) == 0)
336 fatalbox("Error decrypting block!\n");
337 if(CryptEncrypt(hDESKey
[1][1], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
338 fatalbox("Error decrypting block!\n");
339 if(CryptDecrypt(hDESKey
[1][0], 0, FALSE
, 0, blk
, &dlen
) == 0)
340 fatalbox("Error decrypting block!\n");
344 struct ssh_cipher ssh_3des
= {
351 void des_sesskey(unsigned char *key
) {
353 for(i
= 0; i
< 2; i
++) {
354 hDESKey
[i
][0] = create_des_key(key
);
359 void des_encrypt_blk(unsigned char *blk
, int len
) {
362 if(CryptEncrypt(hDESKey
[0][0], 0, FALSE
, 0, blk
, &dlen
, len
+ 8) == 0)
363 fatalbox("Error encrypting block!\n");
367 void des_decrypt_blk(unsigned char *blk
, int len
) {
370 if(CryptDecrypt(hDESKey
[1][0], 0, FALSE
, 0, blk
, &dlen
) == 0)
371 fatalbox("Error decrypting block!\n");
374 struct ssh_cipher ssh_des
= {
381 static HCRYPTKEY
create_des_key(unsigned char *key
) {
383 HCRYPTKEY hSessionKey
, hPrivateKey
;
386 char buf
[sizeof(BLOBHEADER
) + sizeof(ALG_ID
) + 256];
389 * Need special private key to encrypt session key so we can
390 * import session key, since only encrypted session keys can be
393 if(CryptImportKey(hCryptProv
, PrivateKeyWithExponentOfOne
,
394 sizeof(PrivateKeyWithExponentOfOne
),
395 0, 0, &hPrivateKey
) == 0)
398 /* now encrypt session key using special private key */
399 memcpy(buf
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
), key
, 8);
400 if(CryptEncrypt(hPrivateKey
, 0, TRUE
, 0,
401 buf
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
),
405 /* build session key blob */
406 pbh
= (BLOBHEADER
*)buf
;
407 pbh
->bType
= SIMPLEBLOB
;
408 pbh
->bVersion
= 0x02;
410 pbh
->aiKeyAlg
= CALG_DES
;
411 *((ALG_ID
*)(buf
+sizeof(BLOBHEADER
))) = CALG_RSA_KEYX
;
413 /* import session key into key container */
414 if(CryptImportKey(hCryptProv
, buf
,
415 dlen
+ sizeof(BLOBHEADER
) + sizeof(ALG_ID
),
416 hPrivateKey
, 0, &hSessionKey
) == 0)
420 CryptDestroyKey(hPrivateKey
);