/* p5_pbev2.c */
-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 1999.
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 1999-2004.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
#include <stdio.h>
#include "cryptlib.h"
-#include <openssl/asn1_mac.h>
+#include <openssl/asn1t.h>
+#include <openssl/x509.h>
#include <openssl/rand.h>
/* PKCS#5 v2.0 password based encryption structures */
-/*
- *ASN1err(ASN1_F_PBE2PARAM_NEW,ASN1_R_DECODE_ERROR)
- *ASN1err(ASN1_F_D2I_PBE2PARAM,ASN1_R_DECODE_ERROR)
- *ASN1err(ASN1_F_PBKDF2PARAM_NEW,ASN1_R_DECODE_ERROR)
- *ASN1err(ASN1_F_D2I_PBKDF2PARAM,ASN1_R_DECODE_ERROR)
+ASN1_SEQUENCE(PBE2PARAM) = {
+ ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
+ ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
+} ASN1_SEQUENCE_END(PBE2PARAM)
+
+IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
+
+ASN1_SEQUENCE(PBKDF2PARAM) = {
+ ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
+ ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
+ ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
+ ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
+} ASN1_SEQUENCE_END(PBKDF2PARAM)
+
+IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
+
+/* 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.
*/
-int i2d_PBE2PARAM(PBE2PARAM *a, unsigned char **pp)
+X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
+ unsigned char *salt, int saltlen,
+ unsigned char *aiv, int prf_nid)
{
- M_ASN1_I2D_vars(a);
- M_ASN1_I2D_len (a->keyfunc, i2d_X509_ALGOR);
- M_ASN1_I2D_len (a->encryption, i2d_X509_ALGOR);
+ X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
+ int alg_nid, keylen;
+ EVP_CIPHER_CTX ctx;
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ PBE2PARAM *pbe2 = NULL;
+ ASN1_OBJECT *obj;
- M_ASN1_I2D_seq_total ();
+ alg_nid = EVP_CIPHER_type(cipher);
+ if(alg_nid == NID_undef) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
+ ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
+ goto err;
+ }
+ obj = OBJ_nid2obj(alg_nid);
- M_ASN1_I2D_put (a->keyfunc, i2d_X509_ALGOR);
- M_ASN1_I2D_put (a->encryption, i2d_X509_ALGOR);
+ if(!(pbe2 = PBE2PARAM_new())) goto merr;
- M_ASN1_I2D_finish();
-}
+ /* Setup the AlgorithmIdentifier for the encryption scheme */
+ scheme = pbe2->encryption;
-PBE2PARAM *PBE2PARAM_new(void)
-{
- PBE2PARAM *ret=NULL;
- ASN1_CTX c;
- M_ASN1_New_Malloc(ret, PBE2PARAM);
- M_ASN1_New(ret->keyfunc,X509_ALGOR_new);
- M_ASN1_New(ret->encryption,X509_ALGOR_new);
- return (ret);
- M_ASN1_New_Error(ASN1_F_PBE2PARAM_NEW);
-}
+ scheme->algorithm = obj;
+ if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
-PBE2PARAM *d2i_PBE2PARAM(PBE2PARAM **a, unsigned char **pp, long length)
-{
- M_ASN1_D2I_vars(a,PBE2PARAM *,PBE2PARAM_new);
- M_ASN1_D2I_Init();
- M_ASN1_D2I_start_sequence();
- M_ASN1_D2I_get (ret->keyfunc, d2i_X509_ALGOR);
- M_ASN1_D2I_get (ret->encryption, d2i_X509_ALGOR);
- M_ASN1_D2I_Finish(a, PBE2PARAM_free, ASN1_F_D2I_PBE2PARAM);
-}
+ /* Create random IV */
+ 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;
+ }
-void PBE2PARAM_free (PBE2PARAM *a)
-{
- if(a==NULL) return;
- X509_ALGOR_free(a->keyfunc);
- X509_ALGOR_free(a->encryption);
- Free ((char *)a);
-}
+ EVP_CIPHER_CTX_init(&ctx);
-int i2d_PBKDF2PARAM(PBKDF2PARAM *a, unsigned char **pp)
-{
- M_ASN1_I2D_vars(a);
- M_ASN1_I2D_len (a->salt, i2d_ASN1_OCTET_STRING);
- M_ASN1_I2D_len (a->iter, i2d_ASN1_INTEGER);
- M_ASN1_I2D_len (a->keylength, i2d_ASN1_INTEGER);
- M_ASN1_I2D_len (a->prf, i2d_X509_ALGOR);
+ /* Dummy cipherinit to just setup the IV, and PRF */
+ 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_IV,
+ ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ goto err;
+ }
+ /* 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);
- M_ASN1_I2D_seq_total ();
+ /* If its RC2 then we'd better setup the key length */
- M_ASN1_I2D_put (a->salt, i2d_ASN1_OCTET_STRING);
- M_ASN1_I2D_put (a->iter, i2d_ASN1_INTEGER);
- M_ASN1_I2D_put (a->keylength, i2d_ASN1_INTEGER);
- M_ASN1_I2D_put (a->prf, i2d_X509_ALGOR);
+ if(alg_nid == NID_rc2_cbc)
+ keylen = EVP_CIPHER_key_length(cipher);
+ else
+ keylen = -1;
- M_ASN1_I2D_finish();
-}
+ /* Setup keyfunc */
-PBKDF2PARAM *PBKDF2PARAM_new(void)
-{
- PBKDF2PARAM *ret=NULL;
- ASN1_CTX c;
- M_ASN1_New_Malloc(ret, PBKDF2PARAM);
- M_ASN1_New(ret->salt, ASN1_OCTET_STRING_new);
- M_ASN1_New(ret->iter, ASN1_INTEGER_new);
- ret->keylength = NULL;
- ret->prf = NULL;
- return (ret);
- M_ASN1_New_Error(ASN1_F_PBKDF2PARAM_NEW);
-}
+ pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
-PBKDF2PARAM *d2i_PBKDF2PARAM(PBKDF2PARAM **a, unsigned char **pp,
- long length)
-{
- M_ASN1_D2I_vars(a,PBKDF2PARAM *,PBKDF2PARAM_new);
- M_ASN1_D2I_Init();
- M_ASN1_D2I_start_sequence();
- M_ASN1_D2I_get (ret->salt, d2i_ASN1_OCTET_STRING);
- M_ASN1_D2I_get (ret->iter, d2i_ASN1_INTEGER);
- M_ASN1_D2I_get_opt (ret->keylength, d2i_ASN1_INTEGER, V_ASN1_INTEGER);
- M_ASN1_D2I_get_opt (ret->prf, d2i_X509_ALGOR, V_ASN1_SEQUENCE);
- M_ASN1_D2I_Finish(a, PBKDF2PARAM_free, ASN1_F_D2I_PBKDF2PARAM);
-}
+ if (!pbe2->keyfunc)
+ goto merr;
+
+ /* Now set up top level AlgorithmIdentifier */
+
+ if(!(ret = X509_ALGOR_new())) goto merr;
+ if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
+
+ ret->algorithm = OBJ_nid2obj(NID_pbes2);
+
+ /* Encode PBE2PARAM into parameter */
+
+ if(!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
+ &ret->parameter->value.sequence)) goto merr;
+ ret->parameter->type = V_ASN1_SEQUENCE;
+
+ PBE2PARAM_free(pbe2);
+ pbe2 = NULL;
+
+ return ret;
+
+ merr:
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,ERR_R_MALLOC_FAILURE);
+
+ err:
+ PBE2PARAM_free(pbe2);
+ /* Note 'scheme' is freed as part of pbe2 */
+ X509_ALGOR_free(kalg);
+ X509_ALGOR_free(ret);
+
+ return NULL;
-void PBKDF2PARAM_free (PBKDF2PARAM *a)
-{
- if(a==NULL) return;
- ASN1_OCTET_STRING_free(a->salt);
- ASN1_INTEGER_free(a->iter);
- ASN1_INTEGER_free(a->keylength);
- X509_ALGOR_free(a->prf);
- Free ((char *)a);
}
+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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