xref: /plan9/sys/include/libsec.h (revision 6a9fc400c33447ef5e1cda7185cb4de2c8e8010e) 
1 #pragma	lib	"libsec.a"
2 #pragma	src	"/sys/src/libsec"
3 
4 #ifndef _MPINT
5 typedef struct mpint mpint;
6 #endif
7 
8 /////////////////////////////////////////////////////////
9 // AES definitions
10 /////////////////////////////////////////////////////////
11 
12 enum
13 {
14 	AESbsize=	16,
15 	AESmaxkey=	32,
16 	AESmaxrounds=	14
17 };
18 
19 typedef struct AESstate AESstate;
20 struct AESstate
21 {
22 	ulong	setup;
23 	int	rounds;
24 	int	keybytes;
25 	uchar	key[AESmaxkey];		/* unexpanded key */
26 	u32int	ekey[4*(AESmaxrounds + 1)];	/* encryption key */
27 	u32int	dkey[4*(AESmaxrounds + 1)];	/* decryption key */
28 	uchar	ivec[AESbsize];	/* initialization vector */
29 };
30 
31 void	setupAESstate(AESstate *s, uchar key[], int keybytes, uchar *ivec);
32 void	aesCBCencrypt(uchar *p, int len, AESstate *s);
33 void	aesCBCdecrypt(uchar *p, int len, AESstate *s);
34 
35 /////////////////////////////////////////////////////////
36 // Blowfish Definitions
37 /////////////////////////////////////////////////////////
38 
39 enum
40 {
41 	BFbsize	= 8,
42 	BFrounds	= 16
43 };
44 
45 // 16-round Blowfish
46 typedef struct BFstate BFstate;
47 struct BFstate
48 {
49 	ulong	setup;
50 
51 	uchar	key[56];
52 	uchar	ivec[8];
53 
54 	u32int 	pbox[BFrounds+2];
55 	u32int	sbox[1024];
56 };
57 
58 void	setupBFstate(BFstate *s, uchar key[], int keybytes, uchar *ivec);
59 void	bfCBCencrypt(uchar*, int, BFstate*);
60 void	bfCBCdecrypt(uchar*, int, BFstate*);
61 void	bfECBencrypt(uchar*, int, BFstate*);
62 void	bfECBdecrypt(uchar*, int, BFstate*);
63 
64 /////////////////////////////////////////////////////////
65 // DES definitions
66 /////////////////////////////////////////////////////////
67 
68 enum
69 {
70 	DESbsize=	8
71 };
72 
73 // single des
74 typedef struct DESstate DESstate;
75 struct DESstate
76 {
77 	ulong	setup;
78 	uchar	key[8];		/* unexpanded key */
79 	ulong	expanded[32];	/* expanded key */
80 	uchar	ivec[8];	/* initialization vector */
81 };
82 
83 void	setupDESstate(DESstate *s, uchar key[8], uchar *ivec);
84 void	des_key_setup(uchar[8], ulong[32]);
85 void	block_cipher(ulong*, uchar*, int);
86 void	desCBCencrypt(uchar*, int, DESstate*);
87 void	desCBCdecrypt(uchar*, int, DESstate*);
88 void	desECBencrypt(uchar*, int, DESstate*);
89 void	desECBdecrypt(uchar*, int, DESstate*);
90 
91 // for backward compatibility with 7 byte DES key format
92 void	des56to64(uchar *k56, uchar *k64);
93 void	des64to56(uchar *k64, uchar *k56);
94 void	key_setup(uchar[7], ulong[32]);
95 
96 // triple des encrypt/decrypt orderings
97 enum {
98 	DES3E=		0,
99 	DES3D=		1,
100 	DES3EEE=	0,
101 	DES3EDE=	2,
102 	DES3DED=	5,
103 	DES3DDD=	7
104 };
105 
106 typedef struct DES3state DES3state;
107 struct DES3state
108 {
109 	ulong	setup;
110 	uchar	key[3][8];		/* unexpanded key */
111 	ulong	expanded[3][32];	/* expanded key */
112 	uchar	ivec[8];		/* initialization vector */
113 };
114 
115 void	setupDES3state(DES3state *s, uchar key[3][8], uchar *ivec);
116 void	triple_block_cipher(ulong keys[3][32], uchar*, int);
117 void	des3CBCencrypt(uchar*, int, DES3state*);
118 void	des3CBCdecrypt(uchar*, int, DES3state*);
119 void	des3ECBencrypt(uchar*, int, DES3state*);
120 void	des3ECBdecrypt(uchar*, int, DES3state*);
121 
122 /////////////////////////////////////////////////////////
123 // digests
124 /////////////////////////////////////////////////////////
125 
126 enum
127 {
128 	SHA1dlen=	20,	/* SHA digest length */
129 	MD4dlen=	16,	/* MD4 digest length */
130 	MD5dlen=	16	/* MD5 digest length */
131 };
132 
133 typedef struct DigestState DigestState;
134 struct DigestState
135 {
136 	ulong len;
137 	u32int state[5];
138 	uchar buf[128];
139 	int blen;
140 	char malloced;
141 	char seeded;
142 };
143 typedef struct DigestState SHAstate;	/* obsolete name */
144 typedef struct DigestState SHA1state;
145 typedef struct DigestState MD5state;
146 typedef struct DigestState MD4state;
147 
148 DigestState* md4(uchar*, ulong, uchar*, DigestState*);
149 DigestState* md5(uchar*, ulong, uchar*, DigestState*);
150 DigestState* sha1(uchar*, ulong, uchar*, DigestState*);
151 DigestState* hmac_md5(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
152 DigestState* hmac_sha1(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
153 char* sha1pickle(SHA1state*);
154 SHA1state* sha1unpickle(char*);
155 
156 /////////////////////////////////////////////////////////
157 // random number generation
158 /////////////////////////////////////////////////////////
159 void	genrandom(uchar *buf, int nbytes);
160 void	prng(uchar *buf, int nbytes);
161 ulong	fastrand(void);
162 ulong	nfastrand(ulong);
163 
164 /////////////////////////////////////////////////////////
165 // primes
166 /////////////////////////////////////////////////////////
167 void	genprime(mpint *p, int n, int accuracy); // generate an n bit probable prime
168 void	gensafeprime(mpint *p, mpint *alpha, int n, int accuracy);	// prime and generator
169 void	genstrongprime(mpint *p, int n, int accuracy);	// generate an n bit strong prime
170 void	DSAprimes(mpint *q, mpint *p, uchar seed[SHA1dlen]);
171 int	probably_prime(mpint *n, int nrep);	// miller-rabin test
172 int	smallprimetest(mpint *p);		// returns -1 if not prime, 0 otherwise
173 
174 /////////////////////////////////////////////////////////
175 // rc4
176 /////////////////////////////////////////////////////////
177 typedef struct RC4state RC4state;
178 struct RC4state
179 {
180 	 uchar state[256];
181 	 uchar x;
182 	 uchar y;
183 };
184 
185 void	setupRC4state(RC4state*, uchar*, int);
186 void	rc4(RC4state*, uchar*, int);
187 void	rc4skip(RC4state*, int);
188 void	rc4back(RC4state*, int);
189 
190 /////////////////////////////////////////////////////////
191 // rsa
192 /////////////////////////////////////////////////////////
193 typedef struct RSApub RSApub;
194 typedef struct RSApriv RSApriv;
195 
196 // public/encryption key
197 struct RSApub
198 {
199 	mpint	*n;	// modulus
200 	mpint	*ek;	// exp (encryption key)
201 };
202 
203 // private/decryption key
204 struct RSApriv
205 {
206 	RSApub	pub;
207 
208 	mpint	*dk;	// exp (decryption key)
209 
210 	// precomputed values to help with chinese remainder theorem calc
211 	mpint	*p;
212 	mpint	*q;
213 	mpint	*kp;	// dk mod p-1
214 	mpint	*kq;	// dk mod q-1
215 	mpint	*c2;	// (inv p) mod q
216 };
217 
218 RSApriv*	rsagen(int nlen, int elen, int rounds);
219 mpint*		rsaencrypt(RSApub *k, mpint *in, mpint *out);
220 mpint*		rsadecrypt(RSApriv *k, mpint *in, mpint *out);
221 RSApub*		rsapuballoc(void);
222 void		rsapubfree(RSApub*);
223 RSApriv*	rsaprivalloc(void);
224 void		rsaprivfree(RSApriv*);
225 RSApub*		rsaprivtopub(RSApriv*);
226 RSApub*		X509toRSApub(uchar*, int, char*, int);
227 RSApriv*	asn1toRSApriv(uchar*, int);
228 uchar*		decodepem(char *s, char *type, int *len);
229 uchar*		X509gen(RSApriv *priv, char *subj, ulong valid[2], int *certlen);
230 
231 /////////////////////////////////////////////////////////
232 // elgamal
233 /////////////////////////////////////////////////////////
234 typedef struct EGpub EGpub;
235 typedef struct EGpriv EGpriv;
236 typedef struct EGsig EGsig;
237 
238 // public/encryption key
239 struct EGpub
240 {
241 	mpint	*p;	// modulus
242 	mpint	*alpha;	// generator
243 	mpint	*key;	// (encryption key) alpha**secret mod p
244 };
245 
246 // private/decryption key
247 struct EGpriv
248 {
249 	EGpub	pub;
250 	mpint	*secret; // (decryption key)
251 };
252 
253 // signature
254 struct EGsig
255 {
256 	mpint	*r, *s;
257 };
258 
259 EGpriv*		eggen(int nlen, int rounds);
260 mpint*		egencrypt(EGpub *k, mpint *in, mpint *out);
261 mpint*		egdecrypt(EGpriv *k, mpint *in, mpint *out);
262 EGsig*		egsign(EGpriv *k, mpint *m);
263 int		egverify(EGpub *k, EGsig *sig, mpint *m);
264 EGpub*		egpuballoc(void);
265 void		egpubfree(EGpub*);
266 EGpriv*		egprivalloc(void);
267 void		egprivfree(EGpriv*);
268 EGsig*		egsigalloc(void);
269 void		egsigfree(EGsig*);
270 EGpub*		egprivtopub(EGpriv*);
271 
272 /////////////////////////////////////////////////////////
273 // dsa
274 /////////////////////////////////////////////////////////
275 typedef struct DSApub DSApub;
276 typedef struct DSApriv DSApriv;
277 typedef struct DSAsig DSAsig;
278 
279 // public/encryption key
280 struct DSApub
281 {
282 	mpint	*p;	// modulus
283 	mpint	*q;	// group order, q divides p-1
284 	mpint	*alpha;	// group generator
285 	mpint	*key;	// (encryption key) alpha**secret mod p
286 };
287 
288 // private/decryption key
289 struct DSApriv
290 {
291 	DSApub	pub;
292 	mpint	*secret; // (decryption key)
293 };
294 
295 // signature
296 struct DSAsig
297 {
298 	mpint	*r, *s;
299 };
300 
301 DSApriv*	dsagen(DSApub *opub);
302 DSAsig*		dsasign(DSApriv *k, mpint *m);
303 int		dsaverify(DSApub *k, DSAsig *sig, mpint *m);
304 DSApub*		dsapuballoc(void);
305 void		dsapubfree(DSApub*);
306 DSApriv*	dsaprivalloc(void);
307 void		dsaprivfree(DSApriv*);
308 DSAsig*		dsasigalloc(void);
309 void		dsasigfree(DSAsig*);
310 DSApub*		dsaprivtopub(DSApriv*);
311 
312 /////////////////////////////////////////////////////////
313 // TLS
314 /////////////////////////////////////////////////////////
315 typedef struct Thumbprint{
316 	struct Thumbprint *next;
317 	uchar sha1[SHA1dlen];
318 } Thumbprint;
319 
320 typedef struct TLSconn{
321 	char dir[40];  // connection directory
322 	uchar *cert;   // certificate (local on input, remote on output)
323 	uchar *sessionID;
324 	int certlen, sessionIDlen;
325 	int (*trace)(char*fmt, ...);
326 } TLSconn;
327 
328 // tlshand.c
329 extern int tlsClient(int fd, TLSconn *c);
330 extern int tlsServer(int fd, TLSconn *c);
331 
332 // thumb.c
333 extern Thumbprint* initThumbprints(char *ok, char *crl);
334 extern void freeThumbprints(Thumbprint *ok);
335 extern int okThumbprint(uchar *sha1, Thumbprint *ok);
336 
337 // readcert.c
338 extern uchar *readcert(char *filename, int *pcertlen);
339