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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/poly1305/poly1305-donna.c	Lines:	206	206	100.0 %
Date:	2017-11-13	Branches:	22	22	100.0 %


/* $OpenBSD: poly1305-donna.c,v 1.3 2014/06/12 15:49:30 deraadt Exp $ */
/*
 * Public Domain poly1305 from Andrew Moon
 * Based on poly1305-donna.c, poly1305-donna-32.h and poly1305-donna.h from:
 *   https://github.com/floodyberry/poly1305-donna
 */

#include <stddef.h>

static inline void poly1305_init(poly1305_context *ctx,
    const unsigned char key[32]);
static inline void poly1305_update(poly1305_context *ctx,
    const unsigned char *m, size_t bytes);
static inline void poly1305_finish(poly1305_context *ctx,
    unsigned char mac[16]);

/*
 * poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
 * and 64 bit addition.
 */

#define poly1305_block_size 16

/* 17 + sizeof(size_t) + 14*sizeof(unsigned long) */
typedef struct poly1305_state_internal_t {
	unsigned long r[5];
	unsigned long h[5];
	unsigned long pad[4];
	size_t leftover;
	unsigned char buffer[poly1305_block_size];
	unsigned char final;
} poly1305_state_internal_t;

/* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */
static unsigned long
U8TO32(const unsigned char *p)
{
	return (((unsigned long)(p[0] & 0xff)) |
	    ((unsigned long)(p[1] & 0xff) <<  8) |
	    ((unsigned long)(p[2] & 0xff) << 16) |
	    ((unsigned long)(p[3] & 0xff) << 24));
}

/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */
static void
U32TO8(unsigned char *p, unsigned long v)
{
	p[0] = (v) & 0xff;
	p[1] = (v >>  8) & 0xff;
	p[2] = (v >> 16) & 0xff;
	p[3] = (v >> 24) & 0xff;
}

static inline void
poly1305_init(poly1305_context *ctx, const unsigned char key[32])
{
	poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;

	/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
	st->r[0] = (U8TO32(&key[0])) & 0x3ffffff;
	st->r[1] = (U8TO32(&key[3]) >> 2) & 0x3ffff03;
	st->r[2] = (U8TO32(&key[6]) >> 4) & 0x3ffc0ff;
	st->r[3] = (U8TO32(&key[9]) >> 6) & 0x3f03fff;
	st->r[4] = (U8TO32(&key[12]) >> 8) & 0x00fffff;

	/* h = 0 */
	st->h[0] = 0;
	st->h[1] = 0;
	st->h[2] = 0;
	st->h[3] = 0;
	st->h[4] = 0;

	/* save pad for later */
	st->pad[0] = U8TO32(&key[16]);
	st->pad[1] = U8TO32(&key[20]);
	st->pad[2] = U8TO32(&key[24]);
	st->pad[3] = U8TO32(&key[28]);

	st->leftover = 0;
	st->final = 0;
}

static void
poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes)
{
	const unsigned long hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */
	unsigned long r0, r1, r2, r3, r4;
	unsigned long s1, s2, s3, s4;
	unsigned long h0, h1, h2, h3, h4;
	unsigned long long d0, d1, d2, d3, d4;
	unsigned long c;

	r0 = st->r[0];
	r1 = st->r[1];
	r2 = st->r[2];
	r3 = st->r[3];
	r4 = st->r[4];

	s1 = r1 * 5;
	s2 = r2 * 5;
	s3 = r3 * 5;
	s4 = r4 * 5;

	h0 = st->h[0];
	h1 = st->h[1];
	h2 = st->h[2];
	h3 = st->h[3];
	h4 = st->h[4];

	while (bytes >= poly1305_block_size) {
		/* h += m[i] */
		h0 += (U8TO32(m + 0)) & 0x3ffffff;
		h1 += (U8TO32(m + 3) >> 2) & 0x3ffffff;
		h2 += (U8TO32(m + 6) >> 4) & 0x3ffffff;
		h3 += (U8TO32(m + 9) >> 6) & 0x3ffffff;
		h4 += (U8TO32(m + 12) >> 8) | hibit;

		/* h *= r */
		d0 = ((unsigned long long)h0 * r0) +
		    ((unsigned long long)h1 * s4) +
		    ((unsigned long long)h2 * s3) +
		    ((unsigned long long)h3 * s2) +
		    ((unsigned long long)h4 * s1);
		d1 = ((unsigned long long)h0 * r1) +
		    ((unsigned long long)h1 * r0) +
		    ((unsigned long long)h2 * s4) +
		    ((unsigned long long)h3 * s3) +
		    ((unsigned long long)h4 * s2);
		d2 = ((unsigned long long)h0 * r2) +
		    ((unsigned long long)h1 * r1) +
		    ((unsigned long long)h2 * r0) +
		    ((unsigned long long)h3 * s4) +
		    ((unsigned long long)h4 * s3);
		d3 = ((unsigned long long)h0 * r3) +
		    ((unsigned long long)h1 * r2) +
		    ((unsigned long long)h2 * r1) +
		    ((unsigned long long)h3 * r0) +
		    ((unsigned long long)h4 * s4);
		d4 = ((unsigned long long)h0 * r4) +
		    ((unsigned long long)h1 * r3) +
		    ((unsigned long long)h2 * r2) +
		    ((unsigned long long)h3 * r1) +
		    ((unsigned long long)h4 * r0);

		/* (partial) h %= p */
		c = (unsigned long)(d0 >> 26);
		h0 = (unsigned long)d0 & 0x3ffffff;
		d1 += c;
		c = (unsigned long)(d1 >> 26);
		h1 = (unsigned long)d1 & 0x3ffffff;
		d2 += c;
		c = (unsigned long)(d2 >> 26);
		h2 = (unsigned long)d2 & 0x3ffffff;
		d3 += c;
		c = (unsigned long)(d3 >> 26);
		h3 = (unsigned long)d3 & 0x3ffffff;
		d4 += c;
		c = (unsigned long)(d4 >> 26);
		h4 = (unsigned long)d4 & 0x3ffffff;
		h0 += c * 5;
		c = (h0 >> 26);
		h0 = h0 & 0x3ffffff;
		h1 += c;

		m += poly1305_block_size;
		bytes -= poly1305_block_size;
	}

	st->h[0] = h0;
	st->h[1] = h1;
	st->h[2] = h2;
	st->h[3] = h3;
	st->h[4] = h4;
}

static inline void
poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes)
{
	poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
	size_t i;

	/* handle leftover */
	if (st->leftover) {
		size_t want = (poly1305_block_size - st->leftover);
		if (want > bytes)
			want = bytes;
		for (i = 0; i < want; i++)
			st->buffer[st->leftover + i] = m[i];
		bytes -= want;
		m += want;
		st->leftover += want;
		if (st->leftover < poly1305_block_size)
			return;
		poly1305_blocks(st, st->buffer, poly1305_block_size);
		st->leftover = 0;
	}

	/* process full blocks */
	if (bytes >= poly1305_block_size) {
		size_t want = (bytes & ~(poly1305_block_size - 1));
		poly1305_blocks(st, m, want);
		m += want;
		bytes -= want;
	}

	/* store leftover */
	if (bytes) {
		for (i = 0; i < bytes; i++)
			st->buffer[st->leftover + i] = m[i];
		st->leftover += bytes;
	}
}

static inline void
poly1305_finish(poly1305_context *ctx, unsigned char mac[16])
{
	poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
	unsigned long h0, h1, h2, h3, h4, c;
	unsigned long g0, g1, g2, g3, g4;
	unsigned long long f;
	unsigned long mask;

	/* process the remaining block */
	if (st->leftover) {
		size_t i = st->leftover;
		st->buffer[i++] = 1;
		for (; i < poly1305_block_size; i++)
			st->buffer[i] = 0;
		st->final = 1;
		poly1305_blocks(st, st->buffer, poly1305_block_size);
	}

	/* fully carry h */
	h0 = st->h[0];
	h1 = st->h[1];
	h2 = st->h[2];
	h3 = st->h[3];
	h4 = st->h[4];

	c = h1 >> 26;
	h1 = h1 & 0x3ffffff;
	h2 += c;
	c = h2 >> 26;
	h2 = h2 & 0x3ffffff;
	h3 += c;
	c = h3 >> 26;
	h3 = h3 & 0x3ffffff;
	h4 += c;
	c = h4 >> 26;
	h4 = h4 & 0x3ffffff;
	h0 += c * 5;
	c = h0 >> 26;
	h0 = h0 & 0x3ffffff;
	h1 += c;

	/* compute h + -p */
	g0 = h0 + 5;
	c = g0 >> 26;
	g0 &= 0x3ffffff;
	g1 = h1 + c;
	c = g1 >> 26;
	g1 &= 0x3ffffff;
	g2 = h2 + c;
	c = g2 >> 26;
	g2 &= 0x3ffffff;
	g3 = h3 + c;
	c = g3 >> 26;
	g3 &= 0x3ffffff;
	g4 = h4 + c - (1 << 26);

	/* select h if h < p, or h + -p if h >= p */
	mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1;
	g0 &= mask;
	g1 &= mask;
	g2 &= mask;
	g3 &= mask;
	g4 &= mask;
	mask = ~mask;
	h0 = (h0 & mask) | g0;
	h1 = (h1 & mask) | g1;
	h2 = (h2 & mask) | g2;
	h3 = (h3 & mask) | g3;
	h4 = (h4 & mask) | g4;

	/* h = h % (2^128) */
	h0 = ((h0) | (h1 << 26)) & 0xffffffff;
	h1 = ((h1 >>  6) | (h2 << 20)) & 0xffffffff;
	h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
	h3 = ((h3 >> 18) | (h4 <<  8)) & 0xffffffff;

	/* mac = (h + pad) % (2^128) */
	f = (unsigned long long)h0 + st->pad[0];
	h0 = (unsigned long)f;
	f = (unsigned long long)h1 + st->pad[1] + (f >> 32);
	h1 = (unsigned long)f;
	f = (unsigned long long)h2 + st->pad[2] + (f >> 32);
	h2 = (unsigned long)f;
	f = (unsigned long long)h3 + st->pad[3] + (f >> 32);
	h3 = (unsigned long)f;

	U32TO8(mac +  0, h0);
	U32TO8(mac +  4, h1);
	U32TO8(mac +  8, h2);
	U32TO8(mac + 12, h3);

	/* zero out the state */
	st->h[0] = 0;
	st->h[1] = 0;
	st->h[2] = 0;
	st->h[3] = 0;
	st->h[4] = 0;
	st->r[0] = 0;
	st->r[1] = 0;
	st->r[2] = 0;
	st->r[3] = 0;
	st->r[4] = 0;
	st->pad[0] = 0;
	st->pad[1] = 0;
	st->pad[2] = 0;
	st->pad[3] = 0;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: poly1305-donna.c,v 1.3 2014/06/12 15:49:30 deraadt Exp $ */
2			/*
3			* Public Domain poly1305 from Andrew Moon
4			* Based on poly1305-donna.c, poly1305-donna-32.h and poly1305-donna.h from:
5			* https://github.com/floodyberry/poly1305-donna
6			*/
7
8			#include <stddef.h>
9
10			static inline void poly1305_init(poly1305_context *ctx,
11			const unsigned char key[32]);
12			static inline void poly1305_update(poly1305_context *ctx,
13			const unsigned char *m, size_t bytes);
14			static inline void poly1305_finish(poly1305_context *ctx,
15			unsigned char mac[16]);
16
17			/*
18			* poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
19			* and 64 bit addition.
20			*/
21
22			#define poly1305_block_size 16
23
24			/* 17 + sizeof(size_t) + 14sizeof(unsigned long) /
25			typedef struct poly1305_state_internal_t {
26			unsigned long r[5];
27			unsigned long h[5];
28			unsigned long pad[4];
29			size_t leftover;
30			unsigned char buffer[poly1305_block_size];
31			unsigned char final;
32			} poly1305_state_internal_t;
33
34			/* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */
35			static unsigned long
36			U8TO32(const unsigned char *p)
37			{
38		195816	return (((unsigned long)(p[0] & 0xff)) \|
39		97908	((unsigned long)(p[1] & 0xff) << 8) \|
40		97908	((unsigned long)(p[2] & 0xff) << 16) \|
41		48954	((unsigned long)(p[3] & 0xff) << 24));
42			}
43
44			/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */
45			static void
46			U32TO8(unsigned char *p, unsigned long v)
47			{
48		7008	p[0] = (v) & 0xff;
49		3504	p[1] = (v >> 8) & 0xff;
50		3504	p[2] = (v >> 16) & 0xff;
51		3504	p[3] = (v >> 24) & 0xff;
52		3504	}
53
54			static inline void
55			poly1305_init(poly1305_context *ctx, const unsigned char key[32])
56			{
57		1752	poly1305_state_internal_t st = (poly1305_state_internal_t )ctx;
58
59			/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
60		876	st->r[0] = (U8TO32(&key[0])) & 0x3ffffff;
61		876	st->r[1] = (U8TO32(&key[3]) >> 2) & 0x3ffff03;
62		876	st->r[2] = (U8TO32(&key[6]) >> 4) & 0x3ffc0ff;
63		876	st->r[3] = (U8TO32(&key[9]) >> 6) & 0x3f03fff;
64		876	st->r[4] = (U8TO32(&key[12]) >> 8) & 0x00fffff;
65
66			/* h = 0 */
67		876	st->h[0] = 0;
68		876	st->h[1] = 0;
69		876	st->h[2] = 0;
70		876	st->h[3] = 0;
71		876	st->h[4] = 0;
72
73			/* save pad for later */
74		876	st->pad[0] = U8TO32(&key[16]);
75		876	st->pad[1] = U8TO32(&key[20]);
76		876	st->pad[2] = U8TO32(&key[24]);
77		876	st->pad[3] = U8TO32(&key[28]);
78
79		876	st->leftover = 0;
80		876	st->final = 0;
81		876	}
82
83			static void
84			poly1305_blocks(poly1305_state_internal_t st, const unsigned char m, size_t bytes)
85			{
86		5094	const unsigned long hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */
87			unsigned long r0, r1, r2, r3, r4;
88			unsigned long s1, s2, s3, s4;
89			unsigned long h0, h1, h2, h3, h4;
90			unsigned long long d0, d1, d2, d3, d4;
91			unsigned long c;
92
93		2547	r0 = st->r[0];
94		2547	r1 = st->r[1];
95		2547	r2 = st->r[2];
96		2547	r3 = st->r[3];
97		2547	r4 = st->r[4];
98
99		2547	s1 = r1 * 5;
100		2547	s2 = r2 * 5;
101		2547	s3 = r3 * 5;
102		2547	s4 = r4 * 5;
103
104		2547	h0 = st->h[0];
105		2547	h1 = st->h[1];
106		2547	h2 = st->h[2];
107		2547	h3 = st->h[3];
108		2547	h4 = st->h[4];
109
110	✓✓	21522	while (bytes >= poly1305_block_size) {
111			/* h += m[i] */
112		8214	h0 += (U8TO32(m + 0)) & 0x3ffffff;
113		8214	h1 += (U8TO32(m + 3) >> 2) & 0x3ffffff;
114		8214	h2 += (U8TO32(m + 6) >> 4) & 0x3ffffff;
115		8214	h3 += (U8TO32(m + 9) >> 6) & 0x3ffffff;
116		8214	h4 += (U8TO32(m + 12) >> 8) \| hibit;
117
118			/* h = r /
119		16428	d0 = ((unsigned long long)h0 * r0) +
120		16428	((unsigned long long)h1 * s4) +
121		16428	((unsigned long long)h2 * s3) +
122		16428	((unsigned long long)h3 * s2) +
123		8214	((unsigned long long)h4 * s1);
124		16428	d1 = ((unsigned long long)h0 * r1) +
125		16428	((unsigned long long)h1 * r0) +
126		16428	((unsigned long long)h2 * s4) +
127		16428	((unsigned long long)h3 * s3) +
128		8214	((unsigned long long)h4 * s2);
129		16428	d2 = ((unsigned long long)h0 * r2) +
130		16428	((unsigned long long)h1 * r1) +
131		16428	((unsigned long long)h2 * r0) +
132		16428	((unsigned long long)h3 * s4) +
133		8214	((unsigned long long)h4 * s3);
134		16428	d3 = ((unsigned long long)h0 * r3) +
135		16428	((unsigned long long)h1 * r2) +
136		16428	((unsigned long long)h2 * r1) +
137		16428	((unsigned long long)h3 * r0) +
138		8214	((unsigned long long)h4 * s4);
139		16428	d4 = ((unsigned long long)h0 * r4) +
140		16428	((unsigned long long)h1 * r3) +
141		16428	((unsigned long long)h2 * r2) +
142		16428	((unsigned long long)h3 * r1) +
143		8214	((unsigned long long)h4 * r0);
144
145			/* (partial) h %= p */
146		8214	c = (unsigned long)(d0 >> 26);
147		8214	h0 = (unsigned long)d0 & 0x3ffffff;
148		8214	d1 += c;
149		8214	c = (unsigned long)(d1 >> 26);
150		8214	h1 = (unsigned long)d1 & 0x3ffffff;
151		8214	d2 += c;
152		8214	c = (unsigned long)(d2 >> 26);
153		8214	h2 = (unsigned long)d2 & 0x3ffffff;
154		8214	d3 += c;
155		8214	c = (unsigned long)(d3 >> 26);
156		8214	h3 = (unsigned long)d3 & 0x3ffffff;
157		8214	d4 += c;
158		8214	c = (unsigned long)(d4 >> 26);
159		8214	h4 = (unsigned long)d4 & 0x3ffffff;
160		8214	h0 += c * 5;
161		8214	c = (h0 >> 26);
162		8214	h0 = h0 & 0x3ffffff;
163		8214	h1 += c;
164
165		8214	m += poly1305_block_size;
166		8214	bytes -= poly1305_block_size;
167			}
168
169		2547	st->h[0] = h0;
170		2547	st->h[1] = h1;
171		2547	st->h[2] = h2;
172		2547	st->h[3] = h3;
173		2547	st->h[4] = h4;
174		2547	}
175
176			static inline void
177			poly1305_update(poly1305_context ctx, const unsigned char m, size_t bytes)
178			{
179		4188	poly1305_state_internal_t st = (poly1305_state_internal_t )ctx;
180			size_t i;
181
182			/* handle leftover */
183	✓✓	2094	if (st->leftover) {
184		249	size_t want = (poly1305_block_size - st->leftover);
185	✓✓	249	if (want > bytes)
186		15	want = bytes;
187	✓✓	3654	for (i = 0; i < want; i++)
188		1578	st->buffer[st->leftover + i] = m[i];
189		249	bytes -= want;
190		249	m += want;
191		249	st->leftover += want;
192	✓✓	249	if (st->leftover < poly1305_block_size)
193		15	return;
194		234	poly1305_blocks(st, st->buffer, poly1305_block_size);
195		234	st->leftover = 0;
196	✓✓	234	}
197
198			/* process full blocks */
199	✓✓	2079	if (bytes >= poly1305_block_size) {
200		1587	size_t want = (bytes & ~(poly1305_block_size - 1));
201		1587	poly1305_blocks(st, m, want);
202		1587	m += want;
203		1587	bytes -= want;
204		1587	}
205
206			/* store leftover */
207	✓✓	2079	if (bytes) {
208	✓✓	17808	for (i = 0; i < bytes; i++)
209		7944	st->buffer[st->leftover + i] = m[i];
210		960	st->leftover += bytes;
211		960	}
212		4173	}
213
214			static inline void
215			poly1305_finish(poly1305_context *ctx, unsigned char mac[16])
216			{
217		1752	poly1305_state_internal_t st = (poly1305_state_internal_t )ctx;
218			unsigned long h0, h1, h2, h3, h4, c;
219			unsigned long g0, g1, g2, g3, g4;
220			unsigned long long f;
221			unsigned long mask;
222
223			/* process the remaining block */
224	✓✓	876	if (st->leftover) {
225			size_t i = st->leftover;
226		726	st->buffer[i++] = 1;
227	✓✓	11676	for (; i < poly1305_block_size; i++)
228		5112	st->buffer[i] = 0;
229		726	st->final = 1;
230		726	poly1305_blocks(st, st->buffer, poly1305_block_size);
231		726	}
232
233			/* fully carry h */
234		876	h0 = st->h[0];
235		876	h1 = st->h[1];
236		876	h2 = st->h[2];
237		876	h3 = st->h[3];
238		876	h4 = st->h[4];
239
240		876	c = h1 >> 26;
241		876	h1 = h1 & 0x3ffffff;
242		876	h2 += c;
243		876	c = h2 >> 26;
244		876	h2 = h2 & 0x3ffffff;
245		876	h3 += c;
246		876	c = h3 >> 26;
247		876	h3 = h3 & 0x3ffffff;
248		876	h4 += c;
249		876	c = h4 >> 26;
250		876	h4 = h4 & 0x3ffffff;
251		876	h0 += c * 5;
252		876	c = h0 >> 26;
253		876	h0 = h0 & 0x3ffffff;
254		876	h1 += c;
255
256			/* compute h + -p */
257		876	g0 = h0 + 5;
258		876	c = g0 >> 26;
259		876	g0 &= 0x3ffffff;
260		876	g1 = h1 + c;
261		876	c = g1 >> 26;
262		876	g1 &= 0x3ffffff;
263		876	g2 = h2 + c;
264		876	c = g2 >> 26;
265		876	g2 &= 0x3ffffff;
266		876	g3 = h3 + c;
267		876	c = g3 >> 26;
268		876	g3 &= 0x3ffffff;
269		876	g4 = h4 + c - (1 << 26);
270
271			/* select h if h < p, or h + -p if h >= p */
272		876	mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1;
273		876	g0 &= mask;
274		876	g1 &= mask;
275		876	g2 &= mask;
276		876	g3 &= mask;
277		876	g4 &= mask;
278		876	mask = ~mask;
279		876	h0 = (h0 & mask) \| g0;
280		876	h1 = (h1 & mask) \| g1;
281		876	h2 = (h2 & mask) \| g2;
282		876	h3 = (h3 & mask) \| g3;
283		876	h4 = (h4 & mask) \| g4;
284
285			/* h = h % (2^128) */
286		876	h0 = ((h0) \| (h1 << 26)) & 0xffffffff;
287		876	h1 = ((h1 >> 6) \| (h2 << 20)) & 0xffffffff;
288		876	h2 = ((h2 >> 12) \| (h3 << 14)) & 0xffffffff;
289		876	h3 = ((h3 >> 18) \| (h4 << 8)) & 0xffffffff;
290
291			/* mac = (h + pad) % (2^128) */
292		876	f = (unsigned long long)h0 + st->pad[0];
293			h0 = (unsigned long)f;
294		876	f = (unsigned long long)h1 + st->pad[1] + (f >> 32);
295			h1 = (unsigned long)f;
296		876	f = (unsigned long long)h2 + st->pad[2] + (f >> 32);
297			h2 = (unsigned long)f;
298		876	f = (unsigned long long)h3 + st->pad[3] + (f >> 32);
299			h3 = (unsigned long)f;
300
301		876	U32TO8(mac + 0, h0);
302		876	U32TO8(mac + 4, h1);
303		876	U32TO8(mac + 8, h2);
304		876	U32TO8(mac + 12, h3);
305
306			/* zero out the state */
307		876	st->h[0] = 0;
308		876	st->h[1] = 0;
309		876	st->h[2] = 0;
310		876	st->h[3] = 0;
311		876	st->h[4] = 0;
312		876	st->r[0] = 0;
313		876	st->r[1] = 0;
314		876	st->r[2] = 0;
315		876	st->r[3] = 0;
316		876	st->r[4] = 0;
317		876	st->pad[0] = 0;
318		876	st->pad[1] = 0;
319		876	st->pad[2] = 0;
320		876	st->pad[3] = 0;
321		876	}