openssl/crypto/ec/ec2_smpt.c - Issue 9254031: Upgrade chrome's OpenSSL to same version Android ships with.

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Issue 9254031: Upgrade chrome's OpenSSL to same version Android ships with. (Closed) Base URL: http://src.chromium.org/svn/trunk/deps/third_party/openssl/

Patch Set: '' Created 8 years, 11 months ago

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1 /* crypto/ec/ec2_smpt.c */

2 /* This code was originally written by Douglas Stebila

3 * <dstebila@student.math.uwaterloo.ca> for the OpenSSL project.

4 */

5 /* ====================================================================

6 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.

7 *

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

9 * modification, are permitted provided that the following conditions

10 * are met:

11 *

12 * 1. Redistributions of source code must retain the above copyright

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

14 *

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

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

17 * the documentation and/or other materials provided with the

18 * distribution.

19 *

20 * 3. All advertising materials mentioning features or use of this

21 * software must display the following acknowledgment:

22 * "This product includes software developed by the OpenSSL Project

23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

24 *

25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

26 * endorse or promote products derived from this software without

27 * prior written permission. For written permission, please contact

28 * openssl-core@openssl.org.

29 *

30 * 5. Products derived from this software may not be called "OpenSSL"

31 * nor may "OpenSSL" appear in their names without prior written

32 * permission of the OpenSSL Project.

33 *

34 * 6. Redistributions of any form whatsoever must retain the following

35 * acknowledgment:

36 * "This product includes software developed by the OpenSSL Project

37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"

38 *

39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR

43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

50 * OF THE POSSIBILITY OF SUCH DAMAGE.

51 * ====================================================================

52 *

53 * This product includes cryptographic software written by Eric Young

54 * (eay@cryptsoft.com). This product includes software written by Tim

55 * Hudson (tjh@cryptsoft.com).

56 *

57 */

58

59

60 /* Calaculates and sets the affine coordinates of an EC_POINT from the given

61 * compressed coordinates. Uses algorithm 2.3.4 of SEC 1.

62 * Note that the simple implementation only uses affine coordinates.

63 *

64 * This algorithm is patented by Certicom Corp. under US Patent 6,141,420

65 * (for licensing information, contact licensing@certicom.com).

66 * This function is disabled by default and can be enabled by defining the

67 * preprocessor macro OPENSSL_EC_BIN_PT_COMP at Configure-time.

68 */

69 int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP group, EC_POINT p oint,

70 const BIGNUM x_, int y_bit, BN_CTX ctx)

71 {

72 #ifndef OPENSSL_EC_BIN_PT_COMP

73 ECerr(EC_F_EC_GF2M_SIMPLE_SET_COMPRESSED_COORDINATES, ERR_R_DISABLED);

74 return 0;

75 #else

76 BN_CTX *new_ctx = NULL;

77 BIGNUM tmp, x, y, z;

78 int ret = 0, z0;

79

80 /* clear error queue */

81 ERR_clear_error();

82

83 if (ctx == NULL)

84 {

85 ctx = new_ctx = BN_CTX_new();

86 if (ctx == NULL)

87 return 0;

88 }

89

90 y_bit = (y_bit != 0) ? 1 : 0;

91

92 BN_CTX_start(ctx);

93 tmp = BN_CTX_get(ctx);

94 x = BN_CTX_get(ctx);

95 y = BN_CTX_get(ctx);

96 z = BN_CTX_get(ctx);

97 if (z == NULL) goto err;

98

99 if (!BN_GF2m_mod_arr(x, x_, group->poly)) goto err;

100 if (BN_is_zero(x))

101 {

102 if (!BN_GF2m_mod_sqrt_arr(y, &group->b, group->poly, ctx)) goto err;

103 }

104 else

105 {

106 if (!group->meth->field_sqr(group, tmp, x, ctx)) goto err;

107 if (!group->meth->field_div(group, tmp, &group->b, tmp, ctx)) go to err;

108 if (!BN_GF2m_add(tmp, &group->a, tmp)) goto err;

109 if (!BN_GF2m_add(tmp, x, tmp)) goto err;

110 if (!BN_GF2m_mod_solve_quad_arr(z, tmp, group->poly, ctx))

111 {

112 unsigned long err = ERR_peek_last_error();

113

114 if (ERR_GET_LIB(err) == ERR_LIB_BN && ERR_GET_REASON(err ) == BN_R_NO_SOLUTION)

115 {

116 ERR_clear_error();

117 ECerr(EC_F_EC_GF2M_SIMPLE_SET_COMPRESSED_COORDIN ATES, EC_R_INVALID_COMPRESSED_POINT);

118 }

119 else

120 ECerr(EC_F_EC_GF2M_SIMPLE_SET_COMPRESSED_COORDIN ATES, ERR_R_BN_LIB);

121 goto err;

122 }

123 z0 = (BN_is_odd(z)) ? 1 : 0;

124 if (!group->meth->field_mul(group, y, x, z, ctx)) goto err;

125 if (z0 != y_bit)

126 {

127 if (!BN_GF2m_add(y, y, x)) goto err;

128 }

129 }

130

131 if (!EC_POINT_set_affine_coordinates_GF2m(group, point, x, y, ctx)) goto err;

132

133 ret = 1;

134

135 err:

136 BN_CTX_end(ctx);

137 if (new_ctx != NULL)

138 BN_CTX_free(new_ctx);

139 return ret;

140 #endif

141 }

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