openssl/crypto/dh/dh_check.c - Issue 2072073002: Delete bundled copy of OpenSSL and replace with README.

Side by Side Diff: openssl/crypto/dh/dh_check.c

Issue 2072073002: Delete bundled copy of OpenSSL and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master

Patch Set: Delete bundled copy of OpenSSL and replace with README. Created 4 years, 6 months ago

Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.

Jump to:

View unified diff | Download patch

OLD	NEW
	(Empty)
1 /* crypto/dh/dh_check.c */

2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

3 * All rights reserved.

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 <stdio.h>

60 #include "cryptlib.h"

61 #include <openssl/bn.h>

62 #include <openssl/dh.h>

63

64 /* Check that p is a safe prime and

65 * if g is 2, 3 or 5, check that it is a suitable generator

66 * where

67 * for 2, p mod 24 == 11

68 * for 3, p mod 12 == 5

69 * for 5, p mod 10 == 3 or 7

70 * should hold.

71 */

72

73 int DH_check(const DH dh, int ret)

74 {

75 int ok=0;

76 BN_CTX *ctx=NULL;

77 BN_ULONG l;

78 BIGNUM *q=NULL;

79

80 *ret=0;

81 ctx=BN_CTX_new();

82 if (ctx == NULL) goto err;

83 q=BN_new();

84 if (q == NULL) goto err;

85

86 if (BN_is_word(dh->g,DH_GENERATOR_2))

87 {

88 l=BN_mod_word(dh->p,24);

89 if (l != 11) *ret\|=DH_NOT_SUITABLE_GENERATOR;

90 }

91 #if 0

92 else if (BN_is_word(dh->g,DH_GENERATOR_3))

93 {

94 l=BN_mod_word(dh->p,12);

95 if (l != 5) *ret\|=DH_NOT_SUITABLE_GENERATOR;

96 }

97 #endif

98 else if (BN_is_word(dh->g,DH_GENERATOR_5))

99 {

100 l=BN_mod_word(dh->p,10);

101 if ((l != 3) && (l != 7))

102 *ret\|=DH_NOT_SUITABLE_GENERATOR;

103 }

104 else

105 *ret\|=DH_UNABLE_TO_CHECK_GENERATOR;

106

107 if (!BN_is_prime_ex(dh->p,BN_prime_checks,ctx,NULL))

108 *ret\|=DH_CHECK_P_NOT_PRIME;

109 else

110 {

111 if (!BN_rshift1(q,dh->p)) goto err;

112 if (!BN_is_prime_ex(q,BN_prime_checks,ctx,NULL))

113 *ret\|=DH_CHECK_P_NOT_SAFE_PRIME;

114 }

115 ok=1;

116 err:

117 if (ctx != NULL) BN_CTX_free(ctx);

118 if (q != NULL) BN_free(q);

119 return(ok);

120 }

121

122 int DH_check_pub_key(const DH dh, const BIGNUM pub_key, int *ret)

123 {

124 int ok=0;

125 BIGNUM *q=NULL;

126

127 *ret=0;

128 q=BN_new();

129 if (q == NULL) goto err;

130 BN_set_word(q,1);

131 if (BN_cmp(pub_key,q)<=0)

132 *ret\|=DH_CHECK_PUBKEY_TOO_SMALL;

133 BN_copy(q,dh->p);

134 BN_sub_word(q,1);

135 if (BN_cmp(pub_key,q)>=0)

136 *ret\|=DH_CHECK_PUBKEY_TOO_LARGE;

137

138 ok = 1;

139 err:

140 if (q != NULL) BN_free(q);

141 return(ok);

142 }

OLD	NEW

« no previous file with comments | « openssl/crypto/dh/dh_asn1.c ('k') | openssl/crypto/dh/dh_depr.c » ('j') | no next file with comments »