/* p5_pbev2.c */
-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999-2004.
*/
/* ====================================================================
/* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
* yes I know this is horrible!
+ *
+ * Extended version to allow application supplied PRF NID and IV.
*/
-X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
- unsigned char *salt, int saltlen)
+X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
+ unsigned char *salt, int saltlen,
+ unsigned char *aiv, int prf_nid)
{
X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
- int alg_nid;
+ int alg_nid, keylen;
EVP_CIPHER_CTX ctx;
unsigned char iv[EVP_MAX_IV_LENGTH];
- PBKDF2PARAM *kdf = NULL;
PBE2PARAM *pbe2 = NULL;
- ASN1_OCTET_STRING *osalt = NULL;
ASN1_OBJECT *obj;
- int prf_nid;
alg_nid = EVP_CIPHER_type(cipher);
if(alg_nid == NID_undef) {
- ASN1err(ASN1_F_PKCS5_PBE2_SET,
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
goto err;
}
if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
/* Create random IV */
- if (EVP_CIPHER_iv_length(cipher) &&
- RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
- goto err;
+ if (EVP_CIPHER_iv_length(cipher))
+ {
+ if (aiv)
+ memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
+ else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
+ goto err;
+ }
EVP_CIPHER_CTX_init(&ctx);
/* Dummy cipherinit to just setup the IV, and PRF */
- EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0);
+ if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0))
+ goto err;
if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
- ASN1err(ASN1_F_PKCS5_PBE2_SET,
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
EVP_CIPHER_CTX_cleanup(&ctx);
goto err;
}
- /* An error is OK here: just means use default PRF */
- if (EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0)
+ /* If prf NID unspecified see if cipher has a preference.
+ * An error is OK here: just means use default PRF.
+ */
+ if ((prf_nid == -1) &&
+ EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0)
{
ERR_clear_error();
prf_nid = NID_hmacWithSHA1;
}
EVP_CIPHER_CTX_cleanup(&ctx);
- if(!(kdf = PBKDF2PARAM_new())) goto merr;
- if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr;
-
- if (!saltlen) saltlen = PKCS5_SALT_LEN;
- if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr;
- osalt->length = saltlen;
- if (salt) memcpy (osalt->data, salt, saltlen);
- else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr;
-
- if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
- if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr;
-
- /* Now include salt in kdf structure */
- kdf->salt->value.octet_string = osalt;
- kdf->salt->type = V_ASN1_OCTET_STRING;
- osalt = NULL;
-
/* If its RC2 then we'd better setup the key length */
- if(alg_nid == NID_rc2_cbc) {
- if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr;
- if(!ASN1_INTEGER_set (kdf->keylength,
- EVP_CIPHER_key_length(cipher))) goto merr;
- }
+ if(alg_nid == NID_rc2_cbc)
+ keylen = EVP_CIPHER_key_length(cipher);
+ else
+ keylen = -1;
- /* prf can stay NULL if we are using hmacWithSHA1 */
- if (prf_nid != NID_hmacWithSHA1)
- {
- kdf->prf = X509_ALGOR_new();
- if (!kdf->prf)
- goto merr;
- X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid),
- V_ASN1_NULL, NULL);
- }
-
- /* Now setup the PBE2PARAM keyfunc structure */
+ /* Setup keyfunc */
- pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
+ pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
- /* Encode PBKDF2PARAM into parameter of pbe2 */
-
- if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr;
-
- if(!ASN1_pack_string_of(PBKDF2PARAM, kdf, i2d_PBKDF2PARAM,
- &pbe2->keyfunc->parameter->value.sequence)) goto merr;
- pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE;
-
- PBKDF2PARAM_free(kdf);
- kdf = NULL;
+ if (!pbe2->keyfunc)
+ goto merr;
/* Now set up top level AlgorithmIdentifier */
/* Encode PBE2PARAM into parameter */
- if(!ASN1_pack_string_of(PBE2PARAM, pbe2, i2d_PBE2PARAM,
+ if(!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
&ret->parameter->value.sequence)) goto merr;
ret->parameter->type = V_ASN1_SEQUENCE;
return ret;
merr:
- ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE);
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,ERR_R_MALLOC_FAILURE);
err:
PBE2PARAM_free(pbe2);
/* Note 'scheme' is freed as part of pbe2 */
- M_ASN1_OCTET_STRING_free(osalt);
- PBKDF2PARAM_free(kdf);
X509_ALGOR_free(kalg);
X509_ALGOR_free(ret);
return NULL;
}
+
+X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
+ unsigned char *salt, int saltlen)
+ {
+ return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
+ }
+
+X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
+ int prf_nid, int keylen)
+ {
+ X509_ALGOR *keyfunc = NULL;
+ PBKDF2PARAM *kdf = NULL;
+ ASN1_OCTET_STRING *osalt = NULL;
+
+ if(!(kdf = PBKDF2PARAM_new()))
+ goto merr;
+ if(!(osalt = M_ASN1_OCTET_STRING_new()))
+ goto merr;
+
+ kdf->salt->value.octet_string = osalt;
+ kdf->salt->type = V_ASN1_OCTET_STRING;
+
+ if (!saltlen)
+ saltlen = PKCS5_SALT_LEN;
+ if (!(osalt->data = OPENSSL_malloc (saltlen)))
+ goto merr;
+
+ osalt->length = saltlen;
+
+ if (salt)
+ memcpy (osalt->data, salt, saltlen);
+ else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0)
+ goto merr;
+
+ if(iter <= 0)
+ iter = PKCS5_DEFAULT_ITER;
+
+ if(!ASN1_INTEGER_set(kdf->iter, iter))
+ goto merr;
+
+ /* If have a key len set it up */
+
+ if(keylen > 0)
+ {
+ if(!(kdf->keylength = M_ASN1_INTEGER_new()))
+ goto merr;
+ if(!ASN1_INTEGER_set (kdf->keylength, keylen))
+ goto merr;
+ }
+
+ /* prf can stay NULL if we are using hmacWithSHA1 */
+ if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1)
+ {
+ kdf->prf = X509_ALGOR_new();
+ if (!kdf->prf)
+ goto merr;
+ X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid),
+ V_ASN1_NULL, NULL);
+ }
+
+ /* Finally setup the keyfunc structure */
+
+ keyfunc = X509_ALGOR_new();
+ if (!keyfunc)
+ goto merr;
+
+ keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
+
+ /* Encode PBKDF2PARAM into parameter of pbe2 */
+
+ if(!(keyfunc->parameter = ASN1_TYPE_new()))
+ goto merr;
+
+ if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
+ &keyfunc->parameter->value.sequence))
+ goto merr;
+ keyfunc->parameter->type = V_ASN1_SEQUENCE;
+
+ PBKDF2PARAM_free(kdf);
+ return keyfunc;
+
+ merr:
+ ASN1err(ASN1_F_PKCS5_PBKDF2_SET,ERR_R_MALLOC_FAILURE);
+ PBKDF2PARAM_free(kdf);
+ X509_ALGOR_free(keyfunc);
+ return NULL;
+ }
+
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