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#ifndef _PLAN9_SOURCE

  This header file is an extension to ANSI/POSIX

#endif

#ifndef __LIBSEC_H_

#define __LIBSEC_H_

#pragma	src	"/sys/src/ape/lib/sec"

#pragma	lib	"/$M/lib/ape/libsec.a"

#include <u.h>

#ifndef _MPINT

typedef struct mpint mpint;

#endif

/*

 * AES definitions

 */

enum

{

	AESbsize=	16,

	AESmaxkey=	32,

	AESmaxrounds=	14

};

typedef struct AESstate AESstate;

struct AESstate

{

	ulong	setup;

	ulong	offset;

	int	rounds;

	int	keybytes;

	void	*ekey;				/* expanded encryption round key */

	void	*dkey;				/* expanded decryption round key */

	uchar	key[AESmaxkey];			/* unexpanded key */

	uchar	ivec[AESbsize];			/* initialization vector */

	uchar	storage[512];			/* storage for expanded keys */

};

/* block ciphers */

extern void (*aes_encrypt)(ulong rk[], int Nr, uchar pt[16], uchar ct[16]);

extern void (*aes_decrypt)(ulong rk[], int Nr, uchar ct[16], uchar pt[16]);

void	setupAESstate(AESstate *s, uchar key[], int nkey, uchar *ivec);

void	aesCBCencrypt(uchar *p, int len, AESstate *s);

void	aesCBCdecrypt(uchar *p, int len, AESstate *s);

void	aesCFBencrypt(uchar *p, int len, AESstate *s);

void	aesCFBdecrypt(uchar *p, int len, AESstate *s);

void	aesOFBencrypt(uchar *p, int len, AESstate *s);

typedef struct AESGCMstate AESGCMstate;

struct AESGCMstate

{

	AESstate;

	ulong	H[4];

	ulong	M[16][256][4];

};

void	setupAESGCMstate(AESGCMstate *s, uchar *key, int keylen, uchar *iv, int ivlen);

void	aesgcm_setiv(AESGCMstate *s, uchar *iv, int ivlen);

void	aesgcm_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], AESGCMstate *s);

int	aesgcm_decrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], AESGCMstate *s);

/*

 * Blowfish Definitions

 */

enum

{

	BFbsize	= 8,

	BFrounds= 16

};

/* 16-round Blowfish */

typedef struct BFstate BFstate;

struct BFstate

{

	ulong	setup;

	uchar	key[56];

	uchar	ivec[8];

	u32int 	pbox[BFrounds+2];

	u32int	sbox[1024];

};

void	setupBFstate(BFstate *s, uchar key[], int keybytes, uchar *ivec);

void	bfCBCencrypt(uchar*, int, BFstate*);

void	bfCBCdecrypt(uchar*, int, BFstate*);

void	bfECBencrypt(uchar*, int, BFstate*);

void	bfECBdecrypt(uchar*, int, BFstate*);

/*

 * Chacha definitions

 */

enum

{

	ChachaBsize=	64,

	ChachaKeylen=	256/8,

	ChachaIVlen=	96/8,

	XChachaIVlen=	192/8,

};

typedef struct Chachastate Chachastate;

struct Chachastate

{

	union{

		u32int	input[16];

		struct {

			u32int	constant[4];

			u32int	key[8];

			u32int	counter;

			u32int	iv[3];

		};

	};

	u32int	xkey[8];

	int	rounds;

	int	ivwords;

};

void	setupChachastate(Chachastate*, uchar*, ulong, uchar*, ulong, int);

void	chacha_setiv(Chachastate *, uchar*);

void	chacha_setblock(Chachastate*, u64int);

void	chacha_encrypt(uchar*, ulong, Chachastate*);

void	chacha_encrypt2(uchar*, uchar*, ulong, Chachastate*);

void	hchacha(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds);

void	ccpoly_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);

int	ccpoly_decrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);

/*

 * Salsa definitions

 */

enum

{

	SalsaBsize=	64,

	SalsaKeylen=	256/8,

	SalsaIVlen=	64/8,

	XSalsaIVlen=	192/8,

};

typedef struct Salsastate Salsastate;

struct Salsastate

{

	u32int	input[16];

	u32int	xkey[8];

	int	rounds;

	int	ivwords;

};

void	setupSalsastate(Salsastate*, uchar*, ulong, uchar*, ulong, int);

void	salsa_setiv(Salsastate*, uchar*);

void	salsa_setblock(Salsastate*, u64int);

void	salsa_encrypt(uchar*, ulong, Salsastate*);

void	salsa_encrypt2(uchar*, uchar*, ulong, Salsastate*);

void	salsa_core(u32int in[16], u32int out[16], int rounds);

void	hsalsa(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds);

/*

 * DES definitions

 */

enum

{

	DESbsize=	8

};

/* single des */

typedef struct DESstate DESstate;

struct DESstate

{

	ulong	setup;

	uchar	key[8];		/* unexpanded key */

	ulong	expanded[32];	/* expanded key */

	uchar	ivec[8];	/* initialization vector */

};

void	setupDESstate(DESstate *s, uchar key[8], uchar *ivec);

void	des_key_setup(uchar[8], ulong[32]);

void	block_cipher(ulong*, uchar*, int);

void	desCBCencrypt(uchar*, int, DESstate*);

void	desCBCdecrypt(uchar*, int, DESstate*);

void	desECBencrypt(uchar*, int, DESstate*);

void	desECBdecrypt(uchar*, int, DESstate*);

/* for backward compatibility with 7-byte DES key format */

void	des56to64(uchar *k56, uchar *k64);

void	des64to56(uchar *k64, uchar *k56);

void	key_setup(uchar[7], ulong[32]);

/* triple des encrypt/decrypt orderings */

enum {

	DES3E=		0,

	DES3D=		1,

	DES3EEE=	0,

	DES3EDE=	2,

	DES3DED=	5,

	DES3DDD=	7

};

typedef struct DES3state DES3state;

struct DES3state

{

	ulong	setup;

	uchar	key[3][8];		/* unexpanded key */

	ulong	expanded[3][32];	/* expanded key */

	uchar	ivec[8];		/* initialization vector */

};

void	setupDES3state(DES3state *s, uchar key[3][8], uchar *ivec);

void	triple_block_cipher(ulong keys[3][32], uchar*, int);

void	des3CBCencrypt(uchar*, int, DES3state*);

void	des3CBCdecrypt(uchar*, int, DES3state*);

void	des3ECBencrypt(uchar*, int, DES3state*);

void	des3ECBdecrypt(uchar*, int, DES3state*);

/*

 * digests

 */

enum

{

	SHA1dlen=	20,	/* SHA digest length */

	SHA2_224dlen=	28,	/* SHA-224 digest length */

	SHA2_256dlen=	32,	/* SHA-256 digest length */

	SHA2_384dlen=	48,	/* SHA-384 digest length */

	SHA2_512dlen=	64,	/* SHA-512 digest length */

	MD4dlen=	16,	/* MD4 digest length */

	MD5dlen=	16,	/* MD5 digest length */

	Poly1305dlen=	16,	/* Poly1305 digest length */

	Hmacblksz	= 64,	/* in bytes; from rfc2104 */

};

typedef struct DigestState DigestState;

struct DigestState

{

	uvlong	len;

	union {

		u32int	state[16];

		u64int	bstate[8];

	};

	uchar	buf[256];

	int	blen;

	char	malloced;

	char	seeded;

};

typedef struct DigestState SHAstate;	/* obsolete name */

typedef struct DigestState SHA1state;

typedef struct DigestState SHA2_224state;

typedef struct DigestState SHA2_256state;

typedef struct DigestState SHA2_384state;

typedef struct DigestState SHA2_512state;

typedef struct DigestState MD5state;

typedef struct DigestState MD4state;

DigestState*	md4(uchar*, ulong, uchar*, DigestState*);

DigestState*	md5(uchar*, ulong, uchar*, DigestState*);

DigestState*	sha1(uchar*, ulong, uchar*, DigestState*);

DigestState*	sha2_224(uchar*, ulong, uchar*, DigestState*);

DigestState*	sha2_256(uchar*, ulong, uchar*, DigestState*);

DigestState*	sha2_384(uchar*, ulong, uchar*, DigestState*);

DigestState*	sha2_512(uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_x(uchar *p, ulong len, uchar *key, ulong klen,

			uchar *digest, DigestState *s,

			DigestState*(*x)(uchar*, ulong, uchar*, DigestState*),

			int xlen);

DigestState*	hmac_md5(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_sha1(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_sha2_224(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_sha2_256(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_sha2_384(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

DigestState*	hmac_sha2_512(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

char*		md5pickle(MD5state*);

MD5state*	md5unpickle(char*);

char*		sha1pickle(SHA1state*);

SHA1state*	sha1unpickle(char*);

DigestState*	poly1305(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);

/*

 * random number generation

 */

void	genrandom(uchar *buf, int nbytes);

void	prng(uchar *buf, int nbytes);

ulong	fastrand(void);

ulong	nfastrand(ulong);

/*

 * primes

 */

void	genprime(mpint *p, int n, int accuracy); /* generate n-bit probable prime */

void	gensafeprime(mpint *p, mpint *alpha, int n, int accuracy); /* prime & generator */

void	genstrongprime(mpint *p, int n, int accuracy); /* generate n-bit strong prime */

void	DSAprimes(mpint *q, mpint *p, uchar seed[SHA1dlen]);

int	probably_prime(mpint *n, int nrep);	/* miller-rabin test */

int	smallprimetest(mpint *p);  /* returns -1 if not prime, 0 otherwise */

/*

 * rc4

 */

typedef struct RC4state RC4state;

struct RC4state

{

	 uchar	state[256];

	 uchar	x;

	 uchar	y;

};

void	setupRC4state(RC4state*, uchar*, int);

void	rc4(RC4state*, uchar*, int);

void	rc4skip(RC4state*, int);

void	rc4back(RC4state*, int);

/*

 * rsa

 */

typedef struct RSApub RSApub;

typedef struct RSApriv RSApriv;

typedef struct PEMChain PEMChain;

/* public/encryption key */

struct RSApub

{

	mpint	*n;	/* modulus */

	mpint	*ek;	/* exp (encryption key) */

};

/* private/decryption key */

struct RSApriv

{

	RSApub	pub;

	mpint	*dk;	/* exp (decryption key) */

	/* precomputed values to help with chinese remainder theorem calc */

	mpint	*p;

	mpint	*q;

	mpint	*kp;	/* dk mod p-1 */

	mpint	*kq;	/* dk mod q-1 */

	mpint	*c2;	/* (inv p) mod q */

};

struct PEMChain{

	PEMChain*next;

	uchar	*pem;

	int	pemlen;

};

RSApriv*	rsagen(int nlen, int elen, int rounds);

RSApriv*	rsafill(mpint *n, mpint *e, mpint *d, mpint *p, mpint *q);

mpint*		rsaencrypt(RSApub *k, mpint *in, mpint *out);

mpint*		rsadecrypt(RSApriv *k, mpint *in, mpint *out);

RSApub*		rsapuballoc(void);

void		rsapubfree(RSApub*);

RSApriv*	rsaprivalloc(void);

void		rsaprivfree(RSApriv*);

RSApub*		rsaprivtopub(RSApriv*);

RSApub*		X509toRSApub(uchar*, int, char*, int);

RSApriv*	asn1toRSApriv(uchar*, int);

RSApub*		asn1toRSApub(uchar*, int);

void		asn1dump(uchar *der, int len);

uchar*		decodePEM(char *s, char *type, int *len, char **new_s);

PEMChain*	decodepemchain(char *s, char *type);

uchar*		X509rsagen(RSApriv *priv, char *subj, ulong valid[2], int *certlen);

uchar*		X509rsareq(RSApriv *priv, char *subj, int *certlen);

char*		X509rsaverify(uchar *cert, int ncert, RSApub *pk);

char*		X509rsaverifydigest(uchar *sig, int siglen, uchar *edigest, int edigestlen, RSApub *pk);

void		X509dump(uchar *cert, int ncert);

mpint*		pkcs1padbuf(uchar *buf, int len, mpint *modulus, int blocktype);

int		pkcs1unpadbuf(uchar *buf, int len, mpint *modulus, int blocktype);

int		asn1encodeRSApub(RSApub *pk, uchar *buf, int len);

int		asn1encodedigest(DigestState* (*fun)(uchar*, ulong, uchar*, DigestState*),

			uchar *digest, uchar *buf, int len);

int		X509digestSPKI(uchar *, int, DigestState* (*)(uchar*, ulong, uchar*, DigestState*), uchar *);

/*

 * elgamal

 */

typedef struct EGpub EGpub;

typedef struct EGpriv EGpriv;

typedef struct EGsig EGsig;

/* public/encryption key */

struct EGpub

{

	mpint	*p;	/* modulus */

	mpint	*alpha;	/* generator */

	mpint	*key;	/* (encryption key) alpha**secret mod p */

};

/* private/decryption key */

struct EGpriv

{

	EGpub	pub;

	mpint	*secret;	/* (decryption key) */

};

/* signature */

struct EGsig

{

	mpint	*r, *s;

};

EGpriv*		eggen(int nlen, int rounds);

mpint*		egencrypt(EGpub *k, mpint *in, mpint *out);	/* deprecated */

mpint*		egdecrypt(EGpriv *k, mpint *in, mpint *out);

EGsig*		egsign(EGpriv *k, mpint *m);

int		egverify(EGpub *k, EGsig *sig, mpint *m);

EGpub*		egpuballoc(void);

void		egpubfree(EGpub*);

EGpriv*		egprivalloc(void);

void		egprivfree(EGpriv*);

EGsig*		egsigalloc(void);

void		egsigfree(EGsig*);

EGpub*		egprivtopub(EGpriv*);

/*

 * dsa

 */

typedef struct DSApub DSApub;

typedef struct DSApriv DSApriv;

typedef struct DSAsig DSAsig;

/* public/encryption key */

struct DSApub

{

	mpint	*p;	/* modulus */

	mpint	*q;	/* group order, q divides p-1 */

	mpint	*alpha;	/* group generator */

	mpint	*key;	/* (encryption key) alpha**secret mod p */

};

/* private/decryption key */

struct DSApriv

{

	DSApub	pub;

	mpint	*secret;	/* (decryption key) */

};

/* signature */

struct DSAsig

{

	mpint	*r, *s;

};

DSApriv*	dsagen(DSApub *opub);	/* opub not checked for consistency! */

DSAsig*		dsasign(DSApriv *k, mpint *m);

int		dsaverify(DSApub *k, DSAsig *sig, mpint *m);

DSApub*		dsapuballoc(void);

void		dsapubfree(DSApub*);

DSApriv*	dsaprivalloc(void);

void		dsaprivfree(DSApriv*);

DSAsig*		dsasigalloc(void);

void		dsasigfree(DSAsig*);

DSApub*		dsaprivtopub(DSApriv*);

/*

 * TLS

 */

typedef struct Thumbprint{

	struct Thumbprint *next;

	uchar	hash[SHA2_256dlen];

	uchar	len;

} Thumbprint;

typedef struct TLSconn{

	char	dir[40];	/* connection directory */

	uchar	*cert;	/* certificate (local on input, remote on output) */

	uchar	*sessionID;

	uchar	*psk;

	int	certlen;

	int	sessionIDlen;

	int	psklen;

	int	(*trace)(char*fmt, ...);

	PEMChain*chain;	/* optional extra certificate evidence for servers to present */

	char	*sessionType;

	uchar	*sessionKey;

	int	sessionKeylen;

	char	*sessionConst;

	char	*serverName;

	char	*pskID;

} TLSconn;

/* tlshand.c */

int tlsClient(int fd, TLSconn *c);

int tlsServer(int fd, TLSconn *c);

/* thumb.c */

Thumbprint* initThumbprints(char *ok, char *crl, char *tag);

void	freeThumbprints(Thumbprint *ok);

int	okThumbprint(uchar *hash, int len, Thumbprint *ok);

int	okCertificate(uchar *cert, int len, Thumbprint *ok);

/* readcert.c */

uchar	*readcert(char *filename, int *pcertlen);

PEMChain*readcertchain(char *filename);

/* aes_xts.c */

void aes_xts_encrypt(AESstate *tweak, AESstate *ecb, uvlong sectorNumber, uchar *input, uchar *output, ulong len);

void aes_xts_decrypt(AESstate *tweak, AESstate *ecb, uvlong sectorNumber, uchar *input, uchar *output, ulong len);

typedef struct ECpoint{

	int inf;

	mpint *x;

	mpint *y;

	mpint *z;	/* nil when using affine coordinates */

} ECpoint;

typedef ECpoint ECpub;

typedef struct ECpriv{

	ECpoint;

	mpint *d;

} ECpriv;

typedef struct ECdomain{

	mpint *p;

	mpint *a;

	mpint *b;

	ECpoint G;

	mpint *n;

	mpint *h;

} ECdomain;

void	ecdominit(ECdomain *, void (*init)(mpint *p, mpint *a, mpint *b, mpint *x, mpint *y, mpint *n, mpint *h));

void	ecdomfree(ECdomain *);

void	ecassign(ECdomain *, ECpoint *old, ECpoint *new);

void	ecadd(ECdomain *, ECpoint *a, ECpoint *b, ECpoint *s);

void	ecmul(ECdomain *, ECpoint *a, mpint *k, ECpoint *s);

ECpoint*	strtoec(ECdomain *, char *, char **, ECpoint *);

ECpriv*	ecgen(ECdomain *, ECpriv*);

int	ecverify(ECdomain *, ECpoint *);

int	ecpubverify(ECdomain *, ECpub *);

void	ecdsasign(ECdomain *, ECpriv *, uchar *, int, mpint *, mpint *);

int	ecdsaverify(ECdomain *, ECpub *, uchar *, int, mpint *, mpint *);

void	base58enc(uchar *, char *, int);

int	base58dec(char *, uchar *, int);

ECpub*	ecdecodepub(ECdomain *dom, uchar *, int);

int	ecencodepub(ECdomain *dom, ECpub *, uchar *, int);

void	ecpubfree(ECpub *);

ECpub*	X509toECpub(uchar *cert, int ncert, char *name, int nname, ECdomain *dom);

char*	X509ecdsaverify(uchar *cert, int ncert, ECdomain *dom, ECpub *pub);

char*	X509ecdsaverifydigest(uchar *sig, int siglen, uchar *edigest, int edigestlen, ECdomain *dom, ECpub *pub);

/* curves */

void	secp256r1(mpint *p, mpint *a, mpint *b, mpint *x, mpint *y, mpint *n, mpint *h);

void	secp256k1(mpint *p, mpint *a, mpint *b, mpint *x, mpint *y, mpint *n, mpint *h);

void	secp384r1(mpint *p, mpint *a, mpint *b, mpint *x, mpint *y, mpint *n, mpint *h);

DigestState*	ripemd160(uchar *, ulong, uchar *, DigestState *);

/*

 * Diffie-Hellman key exchange

 */

typedef struct DHstate DHstate;

struct DHstate

{

	mpint	*g;	/* base g */

	mpint	*p;	/* large prime */

	mpint	*q;	/* subgroup prime */

	mpint	*x;	/* random secret */

	mpint	*y;	/* public key y = g**x % p */

};

/* generate new public key: y = g**x % p */

mpint* dh_new(DHstate *dh, mpint *p, mpint *q, mpint *g);

/* calculate shared key: k = y**x % p */

mpint* dh_finish(DHstate *dh, mpint *y);

/* Curve25519 elliptic curve, public key function */

void curve25519(uchar mypublic[32], uchar secret[32], uchar basepoint[32]);

/* Curve25519 diffie hellman */

void curve25519_dh_new(uchar x[32], uchar y[32]);

void curve25519_dh_finish(uchar x[32], uchar y[32], uchar z[32]);

/* password-based key derivation function 2 (rfc2898) */

void pbkdf2_x(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen,

	DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*), int xlen);

/* scrypt password-based key derivation function */

char* scrypt(uchar *p, ulong plen, uchar *s, ulong slen,

	ulong N, ulong R, ulong P,

	uchar *d, ulong dlen);

/* hmac-based key derivation function (rfc5869) */

void hkdf_x(uchar *salt, ulong nsalt, uchar *info, ulong ninfo, uchar *key, ulong nkey, uchar *d, ulong dlen,

	DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*), int xlen);

/* timing safe memcmp() */

int tsmemcmp(void*, void*, ulong);

#endif