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1 files changed, 433 insertions, 0 deletions

diff --git a/src/lib/libcrypto/ec/ecp_oct.c b/src/lib/libcrypto/ec/ecp_oct.c
new file mode 100644
index 0000000000..374a0ee731
--- /dev/null
+++ b/src/lib/libcrypto/ec/ecp_oct.c
@@ -0,0 +1,433 @@
+/* crypto/ec/ecp_oct.c */
+/* Includes code written by Lenka Fibikova <fibikova@exp-math.uni-essen.de>
+ * for the OpenSSL project. 
+ * Includes code written by Bodo Moeller for the OpenSSL project.
+*/
+/* ====================================================================
+ * Copyright (c) 1998-2002 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
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * Portions of this software developed by SUN MICROSYSTEMS, INC.,
+ * and contributed to the OpenSSL project.
+ */
+
+#include <openssl/err.h>
+#include <openssl/symhacks.h>
+
+#include "ec_lcl.h"
+
+int ec_GFp_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 *tmp1, *tmp2, *x, *y;
+        int ret = 0;
+
+        /* 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);
+
+        BN_CTX_start(ctx);
+        tmp1 = BN_CTX_get(ctx);
+        tmp2 = BN_CTX_get(ctx);
+        x = BN_CTX_get(ctx);
+        y = BN_CTX_get(ctx);
+        if (y == NULL) goto err;
+
+        /* Recover y.  We have a Weierstrass equation
+         *     y^2 = x^3 + a*x + b,
+         * so  y  is one of the square roots of  x^3 + a*x + b.
+         */
+
+        /* tmp1 := x^3 */
+        if (!BN_nnmod(x, x_, &group->field,ctx)) goto err;
+        if (group->meth->field_decode == 0)
+                {
+                /* field_{sqr,mul} work on standard representation */
+                if (!group->meth->field_sqr(group, tmp2, x_, ctx)) goto err;
+                if (!group->meth->field_mul(group, tmp1, tmp2, x_, ctx)) goto err;
+                }
+        else
+                {
+                if (!BN_mod_sqr(tmp2, x_, &group->field, ctx)) goto err;
+                if (!BN_mod_mul(tmp1, tmp2, x_, &group->field, ctx)) goto err;
+                }
+        
+        /* tmp1 := tmp1 + a*x */
+        if (group->a_is_minus3)
+                {
+                if (!BN_mod_lshift1_quick(tmp2, x, &group->field)) goto err;
+                if (!BN_mod_add_quick(tmp2, tmp2, x, &group->field)) goto err;
+                if (!BN_mod_sub_quick(tmp1, tmp1, tmp2, &group->field)) goto err;
+                }
+        else
+                {
+                if (group->meth->field_decode)
+                        {
+                        if (!group->meth->field_decode(group, tmp2, &group->a, ctx)) goto err;
+                        if (!BN_mod_mul(tmp2, tmp2, x, &group->field, ctx)) goto err;
+                        }
+                else
+                        {
+                        /* field_mul works on standard representation */
+                        if (!group->meth->field_mul(group, tmp2, &group->a, x, ctx)) goto err;
+                        }
+                
+                if (!BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field)) goto err;
+                }
+        
+        /* tmp1 := tmp1 + b */
+        if (group->meth->field_decode)
+                {
+                if (!group->meth->field_decode(group, tmp2, &group->b, ctx)) goto err;
+                if (!BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field)) goto err;
+                }
+        else
+                {
+                if (!BN_mod_add_quick(tmp1, tmp1, &group->b, &group->field)) goto err;
+                }
+        
+        if (!BN_mod_sqrt(y, tmp1, &group->field, ctx))
+                {
+                unsigned long err = ERR_peek_last_error();
+                
+                if (ERR_GET_LIB(err) == ERR_LIB_BN && ERR_GET_REASON(err) == BN_R_NOT_A_SQUARE)
+                        {
+                        ERR_clear_error();
+                        ECerr(EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES, EC_R_INVALID_COMPRESSED_POINT);
+                        }
+                else
+                        ECerr(EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES, ERR_R_BN_LIB);
+                goto err;
+                }
+
+        if (y_bit != BN_is_odd(y))
+                {
+                if (BN_is_zero(y))
+                        {
+                        int kron;
+
+                        kron = BN_kronecker(x, &group->field, ctx);
+                        if (kron == -2) goto err;
+
+                        if (kron == 1)
+                                ECerr(EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES, EC_R_INVALID_COMPRESSION_BIT);
+                        else
+                                /* BN_mod_sqrt() should have cought this error (not a square) */
+                                ECerr(EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES, EC_R_INVALID_COMPRESSED_POINT);
+                        goto err;
+                        }
+                if (!BN_usub(y, &group->field, y)) goto err;
+                }
+        if (y_bit != BN_is_odd(y))
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES, ERR_R_INTERNAL_ERROR);
+                goto err;
+                }
+
+        if (!EC_POINT_set_affine_coordinates_GFp(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;
+        }
+
+
+size_t ec_GFp_simple_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
+        unsigned char *buf, size_t len, BN_CTX *ctx)
+        {
+        size_t ret;
+        BN_CTX *new_ctx = NULL;
+        int used_ctx = 0;
+        BIGNUM *x, *y;
+        size_t field_len, i, skip;
+
+        if ((form != POINT_CONVERSION_COMPRESSED)
+                && (form != POINT_CONVERSION_UNCOMPRESSED)
+                && (form != POINT_CONVERSION_HYBRID))
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, EC_R_INVALID_FORM);
+                goto err;
+                }
+
+        if (EC_POINT_is_at_infinity(group, point))
+                {
+                /* encodes to a single 0 octet */
+                if (buf != NULL)
+                        {
+                        if (len < 1)
+                                {
+                                ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, EC_R_BUFFER_TOO_SMALL);
+                                return 0;
+                                }
+                        buf[0] = 0;
+                        }
+                return 1;
+                }
+
+
+        /* ret := required output buffer length */
+        field_len = BN_num_bytes(&group->field);
+        ret = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2*field_len;
+
+        /* if 'buf' is NULL, just return required length */
+        if (buf != NULL)
+                {
+                if (len < ret)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, EC_R_BUFFER_TOO_SMALL);
+                        goto err;
+                        }
+
+                if (ctx == NULL)
+                        {
+                        ctx = new_ctx = BN_CTX_new();
+                        if (ctx == NULL)
+                                return 0;
+                        }
+
+                BN_CTX_start(ctx);
+                used_ctx = 1;
+                x = BN_CTX_get(ctx);
+                y = BN_CTX_get(ctx);
+                if (y == NULL) goto err;
+
+                if (!EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx)) goto err;
+
+                if ((form == POINT_CONVERSION_COMPRESSED || form == POINT_CONVERSION_HYBRID) && BN_is_odd(y))
+                        buf[0] = form + 1;
+                else
+                        buf[0] = form;
+        
+                i = 1;
+                
+                skip = field_len - BN_num_bytes(x);
+                if (skip > field_len)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, ERR_R_INTERNAL_ERROR);
+                        goto err;
+                        }
+                while (skip > 0)
+                        {
+                        buf[i++] = 0;
+                        skip--;
+                        }
+                skip = BN_bn2bin(x, buf + i);
+                i += skip;
+                if (i != 1 + field_len)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, ERR_R_INTERNAL_ERROR);
+                        goto err;
+                        }
+
+                if (form == POINT_CONVERSION_UNCOMPRESSED || form == POINT_CONVERSION_HYBRID)
+                        {
+                        skip = field_len - BN_num_bytes(y);
+                        if (skip > field_len)
+                                {
+                                ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, ERR_R_INTERNAL_ERROR);
+                                goto err;
+                                }
+                        while (skip > 0)
+                                {
+                                buf[i++] = 0;
+                                skip--;
+                                }
+                        skip = BN_bn2bin(y, buf + i);
+                        i += skip;
+                        }
+
+                if (i != ret)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_POINT2OCT, ERR_R_INTERNAL_ERROR);
+                        goto err;
+                        }
+                }
+        
+        if (used_ctx)
+                BN_CTX_end(ctx);
+        if (new_ctx != NULL)
+                BN_CTX_free(new_ctx);
+        return ret;
+
+ err:
+        if (used_ctx)
+                BN_CTX_end(ctx);
+        if (new_ctx != NULL)
+                BN_CTX_free(new_ctx);
+        return 0;
+        }
+
+
+int ec_GFp_simple_oct2point(const EC_GROUP *group, EC_POINT *point,
+        const unsigned char *buf, size_t len, BN_CTX *ctx)
+        {
+        point_conversion_form_t form;
+        int y_bit;
+        BN_CTX *new_ctx = NULL;
+        BIGNUM *x, *y;
+        size_t field_len, enc_len;
+        int ret = 0;
+
+        if (len == 0)
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_BUFFER_TOO_SMALL);
+                return 0;
+                }
+        form = buf[0];
+        y_bit = form & 1;
+        form = form & ~1U;
+        if ((form != 0) && (form != POINT_CONVERSION_COMPRESSED)
+                && (form != POINT_CONVERSION_UNCOMPRESSED)
+                && (form != POINT_CONVERSION_HYBRID))
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                return 0;
+                }
+        if ((form == 0 || form == POINT_CONVERSION_UNCOMPRESSED) && y_bit)
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                return 0;
+                }
+
+        if (form == 0)
+                {
+                if (len != 1)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                        return 0;
+                        }
+
+                return EC_POINT_set_to_infinity(group, point);
+                }
+        
+        field_len = BN_num_bytes(&group->field);
+        enc_len = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2*field_len;
+
+        if (len != enc_len)
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                return 0;
+                }
+
+        if (ctx == NULL)
+                {
+                ctx = new_ctx = BN_CTX_new();
+                if (ctx == NULL)
+                        return 0;
+                }
+
+        BN_CTX_start(ctx);
+        x = BN_CTX_get(ctx);
+        y = BN_CTX_get(ctx);
+        if (y == NULL) goto err;
+
+        if (!BN_bin2bn(buf + 1, field_len, x)) goto err;
+        if (BN_ucmp(x, &group->field) >= 0)
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                goto err;
+                }
+
+        if (form == POINT_CONVERSION_COMPRESSED)
+                {
+                if (!EC_POINT_set_compressed_coordinates_GFp(group, point, x, y_bit, ctx)) goto err;
+                }
+        else
+                {
+                if (!BN_bin2bn(buf + 1 + field_len, field_len, y)) goto err;
+                if (BN_ucmp(y, &group->field) >= 0)
+                        {
+                        ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                        goto err;
+                        }
+                if (form == POINT_CONVERSION_HYBRID)
+                        {
+                        if (y_bit != BN_is_odd(y))
+                                {
+                                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_INVALID_ENCODING);
+                                goto err;
+                                }
+                        }
+
+                if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) goto err;
+                }
+        
+        if (!EC_POINT_is_on_curve(group, point, ctx)) /* test required by X9.62 */
+                {
+                ECerr(EC_F_EC_GFP_SIMPLE_OCT2POINT, EC_R_POINT_IS_NOT_ON_CURVE);
+                goto err;
+                }
+
+        ret = 1;
+        
+ err:
+        BN_CTX_end(ctx);
+        if (new_ctx != NULL)
+                BN_CTX_free(new_ctx);
+        return ret;
+        }
+