PKCS#3 DH PKCS#8 ASN1 support.
authorDr. Stephen Henson <steve@openssl.org>
Wed, 12 Apr 2006 23:06:10 +0000 (23:06 +0000)
committerDr. Stephen Henson <steve@openssl.org>
Wed, 12 Apr 2006 23:06:10 +0000 (23:06 +0000)
crypto/dh/dh.h
crypto/dh/dh_ameth.c
crypto/dh/dh_err.c

index ef918b6..f81bad1 100644 (file)
@@ -216,14 +216,18 @@ void ERR_load_DH_strings(void);
 #define DH_F_DH_BUILTIN_GENPARAMS                       106
 #define DH_F_DH_NEW_METHOD                              105
 #define DH_F_DH_PARAM_DECODE                            107
+#define DH_F_DH_PRIV_DECODE                             110
+#define DH_F_DH_PRIV_ENCODE                             111
 #define DH_F_DH_PUB_DECODE                              108
 #define DH_F_DH_PUB_ENCODE                              109
+#define DH_F_DSA_PRIV_ENCODE                            112
 #define DH_F_GENERATE_KEY                               103
 #define DH_F_GENERATE_PARAMETERS                        104
 
 /* Reason codes. */
 #define DH_R_BAD_GENERATOR                              101
 #define DH_R_BN_DECODE_ERROR                            103
+#define DH_R_BN_ERROR                                   106
 #define DH_R_DECODE_ERROR                               104
 #define DH_R_INVALID_PUBKEY                             102
 #define DH_R_NO_PRIVATE_VALUE                           100
index ba22f34..3a5600c 100644 (file)
@@ -174,6 +174,117 @@ static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
        return 0;
        }
 
+
+/* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
+ * that the AlgorithmIdentifier contains the paramaters, the private key
+ * is explcitly included and the pubkey must be recalculated.
+ */
+       
+static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
+       {
+       const unsigned char *p, *pm;
+       int pklen, pmlen;
+       int ptype;
+       void *pval;
+       ASN1_STRING *pstr;
+       X509_ALGOR *palg;
+       ASN1_INTEGER *privkey = NULL;
+
+       DH *dh = NULL;
+
+       if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
+               return 0;
+
+       X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+       if (ptype != V_ASN1_SEQUENCE)
+                       goto decerr;
+
+       if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
+               goto decerr;
+
+
+       pstr = pval;    
+       pm = pstr->data;
+       pmlen = pstr->length;
+       if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
+               goto decerr;
+       /* We have parameters now set private key */
+       if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
+               {
+               DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
+               goto dherr;
+               }
+       /* Calculate public key */
+       if (!DH_generate_key(dh))
+               goto dherr;
+
+       EVP_PKEY_assign_DH(pkey, dh);
+
+       ASN1_INTEGER_free(privkey);
+
+       return 1;
+
+       decerr:
+       DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
+       dherr:
+       DH_free(dh);
+       return 0;
+       }
+
+static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
+{
+       ASN1_STRING *params = NULL;
+       ASN1_INTEGER *prkey = NULL;
+       unsigned char *dp = NULL;
+       int dplen;
+
+       params = ASN1_STRING_new();
+
+       if (!params)
+               {
+               DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
+               goto err;
+               }
+
+       params->length = i2d_DHparams(pkey->pkey.dh, &params->data);
+       if (params->length <= 0)
+               {
+               DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
+               goto err;
+               }
+       params->type = V_ASN1_SEQUENCE;
+
+       /* Get private key into integer */
+       prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
+
+       if (!prkey)
+               {
+               DHerr(DH_F_DSA_PRIV_ENCODE,DH_R_BN_ERROR);
+               goto err;
+               }
+
+       dplen = i2d_ASN1_INTEGER(prkey, &dp);
+
+       ASN1_INTEGER_free(prkey);
+
+       if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
+                               V_ASN1_SEQUENCE, params, dp, dplen))
+               goto err;
+
+       return 1;
+
+err:
+       if (dp != NULL)
+               OPENSSL_free(dp);
+       if (params != NULL)
+               ASN1_STRING_free(params);
+       if (prkey != NULL)
+               ASN1_INTEGER_free(prkey);
+       return 0;
+}
+
+
 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
        {
        int i;
@@ -361,8 +472,8 @@ const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
        dh_pub_cmp,
        dh_public_print,
 
-       0,
-       0,
+       dh_priv_decode,
+       dh_priv_encode,
        dh_private_print,
 
        int_dh_size,
index 2a44f1c..8f2c8f8 100644 (file)
@@ -76,8 +76,11 @@ static ERR_STRING_DATA DH_str_functs[]=
 {ERR_FUNC(DH_F_DH_BUILTIN_GENPARAMS),  "DH_BUILTIN_GENPARAMS"},
 {ERR_FUNC(DH_F_DH_NEW_METHOD), "DH_new_method"},
 {ERR_FUNC(DH_F_DH_PARAM_DECODE),       "DH_PARAM_DECODE"},
+{ERR_FUNC(DH_F_DH_PRIV_DECODE),        "DH_PRIV_DECODE"},
+{ERR_FUNC(DH_F_DH_PRIV_ENCODE),        "DH_PRIV_ENCODE"},
 {ERR_FUNC(DH_F_DH_PUB_DECODE), "DH_PUB_DECODE"},
 {ERR_FUNC(DH_F_DH_PUB_ENCODE), "DH_PUB_ENCODE"},
+{ERR_FUNC(DH_F_DSA_PRIV_ENCODE),       "DSA_PRIV_ENCODE"},
 {ERR_FUNC(DH_F_GENERATE_KEY),  "GENERATE_KEY"},
 {ERR_FUNC(DH_F_GENERATE_PARAMETERS),   "GENERATE_PARAMETERS"},
 {0,NULL}
@@ -87,6 +90,7 @@ static ERR_STRING_DATA DH_str_reasons[]=
        {
 {ERR_REASON(DH_R_BAD_GENERATOR)          ,"bad generator"},
 {ERR_REASON(DH_R_BN_DECODE_ERROR)        ,"bn decode error"},
+{ERR_REASON(DH_R_BN_ERROR)               ,"bn error"},
 {ERR_REASON(DH_R_DECODE_ERROR)           ,"decode error"},
 {ERR_REASON(DH_R_INVALID_PUBKEY)         ,"invalid public key"},
 {ERR_REASON(DH_R_NO_PRIVATE_VALUE)       ,"no private value"},