From 15272ab4ed1e6250412fccd48200ed9eae59608f Mon Sep 17 00:00:00 2001 From: marha Date: Mon, 29 Mar 2010 17:08:02 +0000 Subject: Updated to openssl 1.0.0 --- openssl/crypto/ec/ec2_smpl.c | 114 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 91 insertions(+), 23 deletions(-) (limited to 'openssl/crypto/ec/ec2_smpl.c') diff --git a/openssl/crypto/ec/ec2_smpl.c b/openssl/crypto/ec/ec2_smpl.c index 5cd1eac41..cf357b462 100644 --- a/openssl/crypto/ec/ec2_smpl.c +++ b/openssl/crypto/ec/ec2_smpl.c @@ -14,7 +14,7 @@ * */ /* ==================================================================== - * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. + * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -157,6 +157,7 @@ void ec_GF2m_simple_group_clear_finish(EC_GROUP *group) group->poly[2] = 0; group->poly[3] = 0; group->poly[4] = 0; + group->poly[5] = -1; } @@ -174,8 +175,9 @@ int ec_GF2m_simple_group_copy(EC_GROUP *dest, const EC_GROUP *src) dest->poly[2] = src->poly[2]; dest->poly[3] = src->poly[3]; dest->poly[4] = src->poly[4]; - bn_wexpand(&dest->a, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2); - bn_wexpand(&dest->b, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2); + dest->poly[5] = src->poly[5]; + if (bn_wexpand(&dest->a, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) return 0; + if (bn_wexpand(&dest->b, (int)(dest->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) return 0; for (i = dest->a.top; i < dest->a.dmax; i++) dest->a.d[i] = 0; for (i = dest->b.top; i < dest->b.dmax; i++) dest->b.d[i] = 0; return 1; @@ -190,7 +192,7 @@ int ec_GF2m_simple_group_set_curve(EC_GROUP *group, /* group->field */ if (!BN_copy(&group->field, p)) goto err; - i = BN_GF2m_poly2arr(&group->field, group->poly, 5); + i = BN_GF2m_poly2arr(&group->field, group->poly, 6) - 1; if ((i != 5) && (i != 3)) { ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_SET_CURVE, EC_R_UNSUPPORTED_FIELD); @@ -199,12 +201,12 @@ int ec_GF2m_simple_group_set_curve(EC_GROUP *group, /* group->a */ if (!BN_GF2m_mod_arr(&group->a, a, group->poly)) goto err; - bn_wexpand(&group->a, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2); + if(bn_wexpand(&group->a, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) goto err; for (i = group->a.top; i < group->a.dmax; i++) group->a.d[i] = 0; /* group->b */ if (!BN_GF2m_mod_arr(&group->b, b, group->poly)) goto err; - bn_wexpand(&group->b, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2); + if(bn_wexpand(&group->b, (int)(group->poly[0] + BN_BITS2 - 1) / BN_BITS2) == NULL) goto err; for (i = group->b.top; i < group->b.dmax; i++) group->b.d[i] = 0; ret = 1; @@ -404,18 +406,94 @@ int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *group, const EC_ } -/* Include patented algorithms. */ -#include "ec2_smpt.c" +/* Calculates and sets the affine coordinates of an EC_POINT from the given + * compressed coordinates. Uses algorithm 2.3.4 of SEC 1. + * Note that the simple implementation only uses affine coordinates. + * + * The method is from the following publication: + * + * Harper, Menezes, Vanstone: + * "Public-Key Cryptosystems with Very Small Key Lengths", + * EUROCRYPT '92, Springer-Verlag LNCS 658, + * published February 1993 + * + * US Patents 6,141,420 and 6,618,483 (Vanstone, Mullin, Agnew) describe + * the same method, but claim no priority date earlier than July 29, 1994 + * (and additionally fail to cite the EUROCRYPT '92 publication as prior art). + */ +int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point, + const BIGNUM *x_, int y_bit, BN_CTX *ctx) + { + BN_CTX *new_ctx = NULL; + BIGNUM *tmp, *x, *y, *z; + int ret = 0, z0; + + /* clear error queue */ + ERR_clear_error(); + + if (ctx == NULL) + { + ctx = new_ctx = BN_CTX_new(); + if (ctx == NULL) + return 0; + } + + y_bit = (y_bit != 0) ? 1 : 0; + + BN_CTX_start(ctx); + tmp = BN_CTX_get(ctx); + x = BN_CTX_get(ctx); + y = BN_CTX_get(ctx); + z = BN_CTX_get(ctx); + if (z == NULL) goto err; + + if (!BN_GF2m_mod_arr(x, x_, group->poly)) goto err; + if (BN_is_zero(x)) + { + if (!BN_GF2m_mod_sqrt_arr(y, &group->b, group->poly, ctx)) goto err; + } + else + { + if (!group->meth->field_sqr(group, tmp, x, ctx)) goto err; + if (!group->meth->field_div(group, tmp, &group->b, tmp, ctx)) goto err; + if (!BN_GF2m_add(tmp, &group->a, tmp)) goto err; + if (!BN_GF2m_add(tmp, x, tmp)) goto err; + if (!BN_GF2m_mod_solve_quad_arr(z, tmp, group->poly, ctx)) + { + unsigned long err = ERR_peek_last_error(); + + if (ERR_GET_LIB(err) == ERR_LIB_BN && ERR_GET_REASON(err) == BN_R_NO_SOLUTION) + { + ERR_clear_error(); + ECerr(EC_F_EC_GF2M_SIMPLE_SET_COMPRESSED_COORDINATES, EC_R_INVALID_COMPRESSED_POINT); + } + else + ECerr(EC_F_EC_GF2M_SIMPLE_SET_COMPRESSED_COORDINATES, ERR_R_BN_LIB); + goto err; + } + z0 = (BN_is_odd(z)) ? 1 : 0; + if (!group->meth->field_mul(group, y, x, z, ctx)) goto err; + if (z0 != y_bit) + { + if (!BN_GF2m_add(y, y, x)) goto err; + } + } + + if (!EC_POINT_set_affine_coordinates_GF2m(group, point, x, y, ctx)) goto err; + + ret = 1; + + err: + BN_CTX_end(ctx); + if (new_ctx != NULL) + BN_CTX_free(new_ctx); + return ret; + } /* Converts an EC_POINT to an octet string. * If buf is NULL, the encoded length will be returned. * If the length len of buf is smaller than required an error will be returned. - * - * The point compression section of this function is patented by Certicom Corp. - * under US Patent 6,141,420. Point compression is disabled by default and can - * be enabled by defining the preprocessor macro OPENSSL_EC_BIN_PT_COMP at - * Configure-time. */ size_t ec_GF2m_simple_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form, unsigned char *buf, size_t len, BN_CTX *ctx) @@ -426,14 +504,6 @@ size_t ec_GF2m_simple_point2oct(const EC_GROUP *group, const EC_POINT *point, po BIGNUM *x, *y, *yxi; size_t field_len, i, skip; -#ifndef OPENSSL_EC_BIN_PT_COMP - if ((form == POINT_CONVERSION_COMPRESSED) || (form == POINT_CONVERSION_HYBRID)) - { - ECerr(EC_F_EC_GF2M_SIMPLE_POINT2OCT, ERR_R_DISABLED); - goto err; - } -#endif - if ((form != POINT_CONVERSION_COMPRESSED) && (form != POINT_CONVERSION_UNCOMPRESSED) && (form != POINT_CONVERSION_HYBRID)) @@ -488,13 +558,11 @@ size_t ec_GF2m_simple_point2oct(const EC_GROUP *group, const EC_POINT *point, po if (!EC_POINT_get_affine_coordinates_GF2m(group, point, x, y, ctx)) goto err; buf[0] = form; -#ifdef OPENSSL_EC_BIN_PT_COMP if ((form != POINT_CONVERSION_UNCOMPRESSED) && !BN_is_zero(x)) { if (!group->meth->field_div(group, yxi, y, x, ctx)) goto err; if (BN_is_odd(yxi)) buf[0]++; } -#endif i = 1; -- cgit v1.2.3