/* * sha2 128-bit */#include <u.h>#include <libc.h>#include <libsec.h> static void encode64(uchar*, u64int*, ulong);static DigestState* sha2_128(uchar *, ulong, uchar *, SHA2_256state *, int); extern void _sha2block128(uchar*, ulong, u64int*); /* *  for sha2_384 and sha2_512, len must be multiple of 128 for all but *  the last call.  There must be room in the input buffer to pad. * *  Note: sha2_384 calls sha2_512block as sha2_384; it just uses a different *  initial seed to produce a truncated 384b hash result.  otherwise *  it's the same as sha2_512. */SHA2_384state*sha2_384(uchar *p, ulong len, uchar *digest, SHA2_384state *s){	if(s == nil) {		s = mallocz(sizeof(*s), 1);		if(s == nil)			return nil;		s->malloced = 1;	}	if(s->seeded == 0){		/*		 * seed the state with the first 64 bits of the fractional		 * parts of the square roots of the 9th thru 16th primes.		 */ 		s->bstate[0] = 0xcbbb9d5dc1059ed8LL;		s->bstate[1] = 0x629a292a367cd507LL;		s->bstate[2] = 0x9159015a3070dd17LL;		s->bstate[3] = 0x152fecd8f70e5939LL;		s->bstate[4] = 0x67332667ffc00b31LL;		s->bstate[5] = 0x8eb44a8768581511LL;		s->bstate[6] = 0xdb0c2e0d64f98fa7LL;		s->bstate[7] = 0x47b5481dbefa4fa4LL;		s->seeded = 1;	}	return sha2_128(p, len, digest, s, SHA2_384dlen);} SHA2_512state*sha2_512(uchar *p, ulong len, uchar *digest, SHA2_512state *s){ 	if(s == nil) {		s = mallocz(sizeof(*s), 1);		if(s == nil)			return nil;		s->malloced = 1;	}	if(s->seeded == 0){		/*		 * seed the state with the first 64 bits of the fractional		 * parts of the square roots of the first 8 primes 2..19).		 */ 		s->bstate[0] = 0x6a09e667f3bcc908LL;		s->bstate[1] = 0xbb67ae8584caa73bLL;		s->bstate[2] = 0x3c6ef372fe94f82bLL;		s->bstate[3] = 0xa54ff53a5f1d36f1LL;		s->bstate[4] = 0x510e527fade682d1LL;		s->bstate[5] = 0x9b05688c2b3e6c1fLL;		s->bstate[6] = 0x1f83d9abfb41bd6bLL;		s->bstate[7] = 0x5be0cd19137e2179LL;		s->seeded = 1;	}	return sha2_128(p, len, digest, s, SHA2_512dlen);} /* common 128 byte block padding and count code for SHA2_384 and SHA2_512 */static DigestState*sha2_128(uchar *p, ulong len, uchar *digest, SHA2_512state *s, int dlen){	int i;	u64int x[16];	uchar buf[256];	uchar *e; 	/* fill out the partial 128 byte block from previous calls */	if(s->blen){		i = 128 - s->blen;		if(len < i)			i = len;		memmove(s->buf + s->blen, p, i);		len -= i;		s->blen += i;		p += i;		if(s->blen == 128){			_sha2block128(s->buf, s->blen, s->bstate);			s->len += s->blen;			s->blen = 0;		}	} 	/* do 128 byte blocks */	i = len & ~(128-1);	if(i){		_sha2block128(p, i, s->bstate);		s->len += i;		len -= i;		p += i;	} 	/* save the left overs if not last call */	if(digest == 0){		if(len){			memmove(s->buf, p, len);			s->blen += len;		}		return s;	} 	/*	 *  this is the last time through, pad what's left with 0x80,	 *  0's, and the input count to create a multiple of 128 bytes.	 */	if(s->blen){		p = s->buf;		len = s->blen;	} else {		memmove(buf, p, len);		p = buf;	}	s->len += len;	e = p + len;	if(len < 112)		i = 112 - len;	else		i = 240 - len;	memset(e, 0, i);	*e = 0x80;	len += i; 	/* append the count */	x[0] = 0;			/* assume 32b length, i.e. < 4GB */	x[1] = s->len<<3;	encode64(p+len, x, 16); 	/* digest the last part */	_sha2block128(p, len+16, s->bstate);	s->len += len+16; 	/* return result and free state */	encode64(digest, s->bstate, dlen);	if(s->malloced == 1)		free(s);	return nil;} /* * Encodes input (ulong long) into output (uchar). * Assumes len is a multiple of 8. */static voidencode64(uchar *output, u64int *input, ulong len){	u64int x;	uchar *e; 	for(e = output + len; output < e;) {		x = *input++;		*output++ = x >> 56;		*output++ = x >> 48;		*output++ = x >> 40;		*output++ = x >> 32;		*output++ = x >> 24;		*output++ = x >> 16;		*output++ = x >> 8;		*output++ = x;	}} DigestState*hmac_sha2_384(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest,	DigestState *s){	return hmac_x(p, len, key, klen, digest, s, sha2_384, SHA2_384dlen);} DigestState*hmac_sha2_512(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest,	DigestState *s){	return hmac_x(p, len, key, klen, digest, s, sha2_512, SHA2_512dlen);}