Add ECDH to validated module.

[openssl.git] / crypto / ecdh / ech_ossl.c

diff --git a/crypto/ecdh/ech_ossl.c b/crypto/ecdh/ech_ossl.c
index 076eb2ea1f6bc3012d6904925c491347107ba8b3..ceaa2f06b6389cd81dd4d09404d852407242b4ba 100644 (file)
--- a/crypto/ecdh/ech_ossl.c
+++ b/crypto/ecdh/ech_ossl.c
@@ -67,18 +67,22 @@
  *
  */
 
+#define OPENSSL_FIPSAPI
 
+#include <string.h>
 #include <limits.h>
 
 #include "cryptlib.h"
 
-#include <openssl/ecdh.h>
+#include "ech_locl.h"
 #include <openssl/err.h>
 #include <openssl/sha.h>
 #include <openssl/obj_mac.h>
+#include <openssl/bn.h>
 
-static int ecdh_compute_key(void *out, size_t len, const EC_POINT *pub_key, EC_KEY *ecdh,
-                            void *(*KDF)(void *in, size_t inlen, void *out, size_t outlen));
+static int ecdh_compute_key(void *out, size_t len, const EC_POINT *pub_key,
+       EC_KEY *ecdh, 
+       void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen));
 
 static ECDH_METHOD openssl_ecdh_meth = {
        "OpenSSL ECDH method",
@@ -102,13 +106,17 @@ const ECDH_METHOD *ECDH_OpenSSL(void)
  *  - ECSVDP-DH
  * Finally an optional KDF is applied.
  */
-static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, EC_KEY *ecdh,
-                            void *(*KDF)(void *in, size_t inlen, void *out, size_t outlen))
+static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
+       EC_KEY *ecdh,
+       void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen))
        {
        BN_CTX *ctx;
        EC_POINT *tmp=NULL;
        BIGNUM *x=NULL, *y=NULL;
-       int ret= -1, buflen, len;
+       const BIGNUM *priv_key;
+       const EC_GROUP* group;
+       int ret= -1;
+       size_t buflen, len;
        unsigned char *buf=NULL;
 
        if (outlen > INT_MAX)
@@ -122,42 +130,46 @@ static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, E
        x = BN_CTX_get(ctx);
        y = BN_CTX_get(ctx);
        
-       if (ecdh->priv_key == NULL)
+       priv_key = EC_KEY_get0_private_key(ecdh);
+       if (priv_key == NULL)
                {
                ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_NO_PRIVATE_VALUE);
                goto err;
                }
 
-       if ((tmp=EC_POINT_new(ecdh->group)) == NULL)
+       group = EC_KEY_get0_group(ecdh);
+       if ((tmp=EC_POINT_new(group)) == NULL)
                {
                ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE);
                goto err;
                }
 
-       if (!EC_POINT_mul(ecdh->group, tmp, NULL, pub_key, ecdh->priv_key, ctx)) 
+       if (!EC_POINT_mul(group, tmp, NULL, pub_key, priv_key, ctx)) 
                {
                ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
                goto err;
                }
                
-       if (EC_METHOD_get_field_type(EC_GROUP_method_of(ecdh->group)) == NID_X9_62_prime_field) 
+       if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field) 
                {
-               if (!EC_POINT_get_affine_coordinates_GFp(ecdh->group, tmp, x, y, ctx)) 
+               if (!EC_POINT_get_affine_coordinates_GFp(group, tmp, x, y, ctx)) 
                        {
                        ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
                        goto err;
                        }
                }
+#ifndef OPENSSL_NO_EC2M
        else
                {
-               if (!EC_POINT_get_affine_coordinates_GF2m(ecdh->group, tmp, x, y, ctx)) 
+               if (!EC_POINT_get_affine_coordinates_GF2m(group, tmp, x, y, ctx)) 
                        {
                        ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE);
                        goto err;
                        }
                }
+#endif
 
-       buflen = (EC_GROUP_get_degree(ecdh->group) + 7)/8;
+       buflen = (EC_GROUP_get_degree(group) + 7)/8;
        len = BN_num_bytes(x);
        if (len > buflen)
                {
@@ -171,7 +183,7 @@ static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, E
                }
        
        memset(buf, 0, buflen - len);
-       if (len != BN_bn2bin(x, buf + buflen - len))
+       if (len != (size_t)BN_bn2bin(x, buf + buflen - len))
                {
                ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_BN_LIB);
                goto err;
@@ -179,7 +191,7 @@ static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, E
 
        if (KDF != 0)
                {
-               if (KDF(buf, buflen, out, outlen) == NULL)
+               if (KDF(buf, buflen, out, &outlen) == NULL)
                        {
                        ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_KDF_FAILED);
                        goto err;
@@ -202,3 +214,15 @@ err:
        if (buf) OPENSSL_free(buf);
        return(ret);
        }
+
+#ifdef OPENSSL_FIPSCANISTER
+/* FIPS stanadlone version of ecdh_check: just return FIPS method */
+ECDH_DATA *fips_ecdh_check(EC_KEY *key)
+       {
+       static ECDH_DATA rv = {
+               0,0,0,
+               &openssl_ecdh_meth
+               };
+       return &rv;
+       }
+#endif