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ofb_enc.c

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/home/opencoverage/opencoverage/guest-scripts/libressl/src/crypto/des/ofb_enc.c

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1 /* $OpenBSD: ofb_enc.c,v 1.6 2014/10/28 07:35:58 jsg Exp $ */ -

4 * -

5 * This package is an SSL implementation written -

6 * by Eric Young (eay@cryptsoft.com). -

7 * The implementation was written so as to conform with Netscapes SSL. -

8 * -

9 * This library is free for commercial and non-commercial use as long as -

10 * the following conditions are aheared to. The following conditions -

11 * apply to all code found in this distribution, be it the RC4, RSA, -

12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation -

13 * included with this distribution is covered by the same copyright terms -

14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). -

15 * -

16 * Copyright remains Eric Young's, and as such any Copyright notices in -

17 * the code are not to be removed. -

18 * If this package is used in a product, Eric Young should be given attribution -

19 * as the author of the parts of the library used. -

20 * This can be in the form of a textual message at program startup or -

21 * in documentation (online or textual) provided with the package. -

22 * -

23 * Redistribution and use in source and binary forms, with or without -

24 * modification, are permitted provided that the following conditions -

25 * are met: -

26 * 1. Redistributions of source code must retain the copyright -

27 * notice, this list of conditions and the following disclaimer. -

28 * 2. Redistributions in binary form must reproduce the above copyright -

29 * notice, this list of conditions and the following disclaimer in the -

30 * documentation and/or other materials provided with the distribution. -

31 * 3. All advertising materials mentioning features or use of this software -

32 * must display the following acknowledgement: -

33 * "This product includes cryptographic software written by -

34 * Eric Young (eay@cryptsoft.com)" -

35 * The word 'cryptographic' can be left out if the rouines from the library -

36 * being used are not cryptographic related :-). -

37 * 4. If you include any Windows specific code (or a derivative thereof) from -

38 * the apps directory (application code) you must include an acknowledgement: -

39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" -

40 * -

41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND -

42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -

43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -

44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE -

45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -

46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -

47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -

48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -

49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -

50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -

51 * SUCH DAMAGE. -

52 * -

53 * The licence and distribution terms for any publically available version or -

54 * derivative of this code cannot be changed. i.e. this code cannot simply be -

55 * copied and put under another distribution licence -

56 * [including the GNU Public Licence.] -

57 */ -

58 -

59 #include "des_locl.h" -

60 -

61 /* The input and output are loaded in multiples of 8 bits. -

62 * What this means is that if you hame numbits=12 and length=2 -

63 * the first 12 bits will be retrieved from the first byte and half -

64 * the second. The second 12 bits will come from the 3rd and half the 4th -

65 * byte. -

66 */ -

67 void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits, -

68 long length, DES_key_schedule *schedule, -

69 DES_cblock *ivec) -

70 { -

71 DES_LONG d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8; -

72 DES_LONG mask0,mask1; -

73 long l=length; -

74 int num=numbits; -

75 DES_LONG ti[2]; -

76 unsigned char *iv; -

77 -

if (num > 64) return;

never executed: return;

num > 64	Description
TRUE	never evaluated
FALSE	evaluated 2 times by 1 test Evaluated by: destest

0-2

if (num > 32)

num > 32	Description
TRUE	evaluated 2 times by 1 test Evaluated by: destest
FALSE	never evaluated

0-2

80 { -

81 mask0=0xffffffffL; -

if (num >= 64)

num >= 64	Description
TRUE	evaluated 2 times by 1 test Evaluated by: destest
FALSE	never evaluated

0-2

mask1=mask0;

executed 2 times by 1 test: mask1=mask0;

Executed by:

destest

84 else -

mask1=(1L<<(num-32))-1;

never executed: mask1=(1L<<(num-32))-1;

86 } -

87 else -

88 { -

if (num == 32)

num == 32	Description
TRUE	never evaluated
FALSE	never evaluated

mask0=0xffffffffL;

never executed: mask0=0xffffffffL;

91 else -

mask0=(1L<<num)-1;

never executed: mask0=(1L<<num)-1;

93 mask1=0x00000000L; -

}

never executed: end of block

95 -

96 iv = &(*ivec)[0]; -

97 c2l(iv,v0); -

98 c2l(iv,v1); -

99 ti[0]=v0; -

100 ti[1]=v1; -

101

while (l-- > 0)

l-- > 0	Description
TRUE	evaluated 6 times by 1 test Evaluated by: destest
FALSE	evaluated 2 times by 1 test Evaluated by: destest

2-6

102 { -

103 ti[0]=v0; -

104 ti[1]=v1; -

105 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); -

106 vv0=ti[0]; -

107 vv1=ti[1]; -

108

c2ln(in,d0,d1,n);

executed 6 times by 1 test: end of block

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never executed: case 7:

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executed 6 times by 1 test: case 1:

Executed by:

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0-6

109 in+=n; -

110 d0=(d0^vv0)&mask0; -

111 d1=(d1^vv1)&mask1; -

112

l2cn(d0,d1,out,n);

executed 6 times by 1 test: end of block

Executed by:

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0-6

113 out+=n; -

114 -

115

if (num == 32)

num == 32	Description
TRUE	never evaluated
FALSE	evaluated 6 times by 1 test Evaluated by: destest

0-6

116

{ v0=v1; v1=vv0; }

never executed: end of block

117

else if (num == 64)

num == 64	Description
TRUE	evaluated 6 times by 1 test Evaluated by: destest
FALSE	never evaluated

0-6

118

{ v0=vv0; v1=vv1; }

executed 6 times by 1 test: end of block

Executed by:

destest

119

else if (num > 32) /* && num != 64 */

num > 32	Description
TRUE	never evaluated
FALSE	never evaluated

120 { -

121 v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL; -

122 v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL; -

123

}

never executed: end of block

124 else /* num < 32 */ -

125 { -

126 v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL; -

127 v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL; -

128

}

never executed: end of block

129 } -

130 iv = &(*ivec)[0]; -

131 l2c(v0,iv); -

132 l2c(v1,iv); -

133 v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0; -

134

}

executed 2 times by 1 test: end of block

Executed by:

destest

135 -

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