poly1305.c

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poly1305.c

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/home/opencoverage/opencoverage/guest-scripts/openssh/src/poly1305.c

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* Public Domain poly1305 from Andrew Moon

* poly1305-donna-unrolled.c from https://github.com/floodyberry/poly1305-donna

/* $OpenBSD: poly1305.c,v 1.3 2013/12/19 22:57:13 djm Exp $ */

#include "includes.h"

#include <sys/types.h>

#ifdef HAVE_STDINT_H

# include <stdint.h>

#endif

#include "poly1305.h"

#define mul32x32_64(a,b) ((uint64_t)(a) * (b))

#define U8TO32_LE(p) \

(((uint32_t)((p)[0])) | \

((uint32_t)((p)[1]) << 8) | \

((uint32_t)((p)[2]) << 16) | \

((uint32_t)((p)[3]) << 24))

#define U32TO8_LE(p, v) \

do { \

(p)[0] = (uint8_t)((v)); \

(p)[1] = (uint8_t)((v) >> 8); \

(p)[2] = (uint8_t)((v) >> 16); \

(p)[3] = (uint8_t)((v) >> 24); \

} while (0)

void

poly1305_auth(unsigned char out[POLY1305_TAGLEN], const unsigned char *m, size_t inlen, const unsigned char key[POLY1305_KEYLEN]) {

uint32_t t0,t1,t2,t3;

uint32_t h0,h1,h2,h3,h4;

uint32_t r0,r1,r2,r3,r4;

uint32_t s1,s2,s3,s4;

uint32_t b, nb;

size_t j;

uint64_t t[5];

uint64_t f0,f1,f2,f3;

uint32_t g0,g1,g2,g3,g4;

uint64_t c;

unsigned char mp[16];

/* clamp key */

t0 = U8TO32_LE(key+0);

t1 = U8TO32_LE(key+4);

t2 = U8TO32_LE(key+8);

t3 = U8TO32_LE(key+12);

/* precompute multipliers */

r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6;

r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12;

r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18;

r3 = t2 & 0x3f03fff; t3 >>= 8;

r4 = t3 & 0x00fffff;

s1 = r1 * 5;

s2 = r2 * 5;

s3 = r3 * 5;

s4 = r4 * 5;

/* init state */

h0 = 0;

h1 = 0;

h2 = 0;

h3 = 0;

h4 = 0;

/* full blocks */

if (inlen < 16) goto poly1305_donna_atmost15bytes;

executed 512 times by 1 test: goto poly1305_donna_atmost15bytes;

Executed by:

test_kex

inlen < 16	Description
TRUE	evaluated 512 times by 1 test Evaluated by: test_kex
FALSE	evaluated 1152 times by 1 test Evaluated by: test_kex

512-1152

poly1305_donna_16bytes:

code before this statement executed 1152 times by 1 test: poly1305_donna_16bytes:

Executed by:

test_kex

1152

m += 16;

inlen -= 16;

t0 = U8TO32_LE(m-16);

t1 = U8TO32_LE(m-12);

t2 = U8TO32_LE(m-8);

t3 = U8TO32_LE(m-4);

h0 += t0 & 0x3ffffff;

h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;

h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;

h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;

h4 += (t3 >> 8) | (1 << 24);

poly1305_donna_mul:

code before this statement executed 46460 times by 1 test: poly1305_donna_mul:

Executed by:

test_kex

46460

t[0] = mul32x32_64(h0,r0) + mul32x32_64(h1,s4) + mul32x32_64(h2,s3) + mul32x32_64(h3,s2) + mul32x32_64(h4,s1);

t[1] = mul32x32_64(h0,r1) + mul32x32_64(h1,r0) + mul32x32_64(h2,s4) + mul32x32_64(h3,s3) + mul32x32_64(h4,s2);

t[2] = mul32x32_64(h0,r2) + mul32x32_64(h1,r1) + mul32x32_64(h2,r0) + mul32x32_64(h3,s4) + mul32x32_64(h4,s3);

t[3] = mul32x32_64(h0,r3) + mul32x32_64(h1,r2) + mul32x32_64(h2,r1) + mul32x32_64(h3,r0) + mul32x32_64(h4,s4);

t[4] = mul32x32_64(h0,r4) + mul32x32_64(h1,r3) + mul32x32_64(h2,r2) + mul32x32_64(h3,r1) + mul32x32_64(h4,r0);

h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26);

t[1] += c; h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26);

t[2] += b; h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26);

100

t[3] += b; h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26);

101

t[4] += b; h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26);

102

h0 += b * 5;

103

104

if (inlen >= 16) goto poly1305_donna_16bytes;

executed 45308 times by 1 test: goto poly1305_donna_16bytes;

Executed by:

test_kex

inlen >= 16	Description
TRUE	evaluated 45308 times by 1 test Evaluated by: test_kex
FALSE	evaluated 2816 times by 1 test Evaluated by: test_kex

2816-45308

105

106

/* final bytes */

107

poly1305_donna_atmost15bytes:

code before this statement executed 2816 times by 1 test: poly1305_donna_atmost15bytes:

Executed by:

test_kex

2816

108

if (!inlen) goto poly1305_donna_finish;

executed 1664 times by 1 test: goto poly1305_donna_finish;

Executed by:

test_kex

!inlen	Description
TRUE	evaluated 1664 times by 1 test Evaluated by: test_kex
FALSE	evaluated 1664 times by 1 test Evaluated by: test_kex

1664

109

110

for (j = 0; j < inlen; j++) mp[j] = m[j];

executed 14304 times by 1 test: mp[j] = m[j];

Executed by:

test_kex

j < inlen	Description
TRUE	evaluated 14304 times by 1 test Evaluated by: test_kex
FALSE	evaluated 1664 times by 1 test Evaluated by: test_kex

1664-14304

111

mp[j++] = 1;

112

for (; j < 16; j++) mp[j] = 0;

executed 10656 times by 1 test: mp[j] = 0;

Executed by:

test_kex

j < 16	Description
TRUE	evaluated 10656 times by 1 test Evaluated by: test_kex
FALSE	evaluated 1664 times by 1 test Evaluated by: test_kex

1664-10656

113

inlen = 0;

114

115

t0 = U8TO32_LE(mp+0);

116

t1 = U8TO32_LE(mp+4);

117

t2 = U8TO32_LE(mp+8);

118

t3 = U8TO32_LE(mp+12);

119

120

h0 += t0 & 0x3ffffff;

121

h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;

122

h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;

123

h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;

124

h4 += (t3 >> 8);

125

126

goto poly1305_donna_mul;

executed 1664 times by 1 test: goto poly1305_donna_mul;

Executed by:

test_kex

1664

127

128

poly1305_donna_finish:

129

b = h0 >> 26; h0 = h0 & 0x3ffffff;

130

h1 += b; b = h1 >> 26; h1 = h1 & 0x3ffffff;

131

h2 += b; b = h2 >> 26; h2 = h2 & 0x3ffffff;

132

h3 += b; b = h3 >> 26; h3 = h3 & 0x3ffffff;

133

h4 += b; b = h4 >> 26; h4 = h4 & 0x3ffffff;

134

h0 += b * 5; b = h0 >> 26; h0 = h0 & 0x3ffffff;

135

h1 += b;

136

137

g0 = h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff;

138

g1 = h1 + b; b = g1 >> 26; g1 &= 0x3ffffff;

139

g2 = h2 + b; b = g2 >> 26; g2 &= 0x3ffffff;

140

g3 = h3 + b; b = g3 >> 26; g3 &= 0x3ffffff;

141

g4 = h4 + b - (1 << 26);

b = (g4 >> 31) - 1;

nb = ~b;

h0 = (h0 & nb) | (g0 & b);

146

h1 = (h1 & nb) | (g1 & b);

147

h2 = (h2 & nb) | (g2 & b);

148

h3 = (h3 & nb) | (g3 & b);

149

h4 = (h4 & nb) | (g4 & b);

150

151

f0 = ((h0 ) | (h1 << 26)) + (uint64_t)U8TO32_LE(&key[16]);

152

f1 = ((h1 >> 6) | (h2 << 20)) + (uint64_t)U8TO32_LE(&key[20]);

153

f2 = ((h2 >> 12) | (h3 << 14)) + (uint64_t)U8TO32_LE(&key[24]);

154

f3 = ((h3 >> 18) | (h4 << 8)) + (uint64_t)U8TO32_LE(&key[28]);

155

156

U32TO8_LE(&out[ 0], f0); f1 += (f0 >> 32);

157

U32TO8_LE(&out[ 4], f1); f2 += (f1 >> 32);

158

U32TO8_LE(&out[ 8], f2); f3 += (f2 >> 32);

159

U32TO8_LE(&out[12], f3);

160

}

executed 1664 times by 1 test: end of block

Executed by:

test_kex

1664

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