--- /dev/null
+/*
+ * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/x509.h>
+#include <openssl/rand.h>
+
+#ifndef OPENSSL_NO_SCRYPT
+/* PKCS#5 scrypt password based encryption structures */
+
+typedef struct {
+ ASN1_OCTET_STRING *salt;
+ ASN1_INTEGER *costParameter;
+ ASN1_INTEGER *blockSize;
+ ASN1_INTEGER *parallelizationParameter;
+ ASN1_INTEGER *keyLength;
+} SCRYPT_PARAMS;
+
+ASN1_SEQUENCE(SCRYPT_PARAMS) = {
+ ASN1_SIMPLE(SCRYPT_PARAMS, salt, ASN1_OCTET_STRING),
+ ASN1_SIMPLE(SCRYPT_PARAMS, costParameter, ASN1_INTEGER),
+ ASN1_SIMPLE(SCRYPT_PARAMS, blockSize, ASN1_INTEGER),
+ ASN1_SIMPLE(SCRYPT_PARAMS, parallelizationParameter, ASN1_INTEGER),
+ ASN1_OPT(SCRYPT_PARAMS, keyLength, ASN1_INTEGER),
+} static_ASN1_SEQUENCE_END(SCRYPT_PARAMS)
+
+DECLARE_ASN1_ALLOC_FUNCTIONS(SCRYPT_PARAMS)
+IMPLEMENT_ASN1_ALLOC_FUNCTIONS(SCRYPT_PARAMS)
+
+static X509_ALGOR *pkcs5_scrypt_set(const unsigned char *salt, size_t saltlen,
+ size_t keylen, uint64_t N, uint64_t r,
+ uint64_t p);
+
+/*
+ * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm using scrypt
+ */
+
+X509_ALGOR *PKCS5_pbe2_set_scrypt(const EVP_CIPHER *cipher,
+ const unsigned char *salt, int saltlen,
+ unsigned char *aiv, uint64_t N, uint64_t r,
+ uint64_t p)
+{
+ X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
+ int alg_nid;
+ size_t keylen = 0;
+ EVP_CIPHER_CTX *ctx = NULL;
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ PBE2PARAM *pbe2 = NULL;
+ ASN1_OBJECT *obj;
+
+ if (!cipher) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_SCRYPT, ERR_R_PASSED_NULL_PARAMETER);
+ goto err;
+ }
+
+ if (EVP_PBE_scrypt(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0) == 0) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_SCRYPT,
+ ASN1_R_INVALID_SCRYPT_PARAMETERS);
+ goto err;
+ }
+
+ alg_nid = EVP_CIPHER_type(cipher);
+ if (alg_nid == NID_undef) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_SCRYPT,
+ ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
+ goto err;
+ }
+ obj = OBJ_nid2obj(alg_nid);
+ pbe2 = PBE2PARAM_new();
+ if (pbe2 == NULL)
+ goto merr;
+
+ /* Setup the AlgorithmIdentifier for the encryption scheme */
+ scheme = pbe2->encryption;
+
+ scheme->algorithm = obj;
+ scheme->parameter = ASN1_TYPE_new();
+ if (scheme->parameter == NULL)
+ goto merr;
+
+ /* Create random IV */
+ if (EVP_CIPHER_iv_length(cipher)) {
+ if (aiv)
+ memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
+ else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
+ goto err;
+ }
+
+ ctx = EVP_CIPHER_CTX_new();
+ if (ctx == NULL)
+ goto merr;
+
+ /* Dummy cipherinit to just setup the IV */
+ if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0) == 0)
+ goto err;
+ if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) < 0) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_SCRYPT,
+ ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
+ goto err;
+ }
+ EVP_CIPHER_CTX_free(ctx);
+ ctx = NULL;
+
+ /* If its RC2 then we'd better setup the key length */
+
+ if (alg_nid == NID_rc2_cbc)
+ keylen = EVP_CIPHER_key_length(cipher);
+
+ /* Setup keyfunc */
+
+ X509_ALGOR_free(pbe2->keyfunc);
+
+ pbe2->keyfunc = pkcs5_scrypt_set(salt, saltlen, keylen, N, r, p);
+
+ if (pbe2->keyfunc == NULL)
+ goto merr;
+
+ /* Now set up top level AlgorithmIdentifier */
+
+ ret = X509_ALGOR_new();
+ if (ret == NULL)
+ goto merr;
+
+ ret->algorithm = OBJ_nid2obj(NID_pbes2);
+
+ /* Encode PBE2PARAM into parameter */
+
+ if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
+ &ret->parameter) == NULL)
+ goto merr;
+
+ PBE2PARAM_free(pbe2);
+ pbe2 = NULL;
+
+ return ret;
+
+ merr:
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_SCRYPT, ERR_R_MALLOC_FAILURE);
+
+ err:
+ PBE2PARAM_free(pbe2);
+ X509_ALGOR_free(kalg);
+ X509_ALGOR_free(ret);
+ EVP_CIPHER_CTX_free(ctx);
+
+ return NULL;
+
+}
+
+static X509_ALGOR *pkcs5_scrypt_set(const unsigned char *salt, size_t saltlen,
+ size_t keylen, uint64_t N, uint64_t r,
+ uint64_t p)
+{
+ X509_ALGOR *keyfunc = NULL;
+ SCRYPT_PARAMS *sparam = NULL;
+
+ sparam = SCRYPT_PARAMS_new();
+ if (sparam == NULL)
+ goto merr;
+
+ if (!saltlen)
+ saltlen = PKCS5_SALT_LEN;
+
+ /* This will either copy salt or grow the buffer */
+ if (ASN1_STRING_set(sparam->salt, salt, saltlen) == 0)
+ goto merr;
+
+ if (salt == NULL && RAND_bytes(sparam->salt->data, saltlen) <= 0)
+ goto err;
+
+ if (ASN1_INTEGER_set_uint64(sparam->costParameter, N) == 0)
+ goto merr;
+
+ if (ASN1_INTEGER_set_uint64(sparam->blockSize, r) == 0)
+ goto merr;
+
+ if (ASN1_INTEGER_set_uint64(sparam->parallelizationParameter, p) == 0)
+ goto merr;
+
+ /* If have a key len set it up */
+
+ if (keylen > 0) {
+ sparam->keyLength = ASN1_INTEGER_new();
+ if (sparam->keyLength == NULL)
+ goto merr;
+ if (ASN1_INTEGER_set_int64(sparam->keyLength, keylen) == 0)
+ goto merr;
+ }
+
+ /* Finally setup the keyfunc structure */
+
+ keyfunc = X509_ALGOR_new();
+ if (keyfunc == NULL)
+ goto merr;
+
+ keyfunc->algorithm = OBJ_nid2obj(NID_id_scrypt);
+
+ /* Encode SCRYPT_PARAMS into parameter of pbe2 */
+
+ if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), sparam,
+ &keyfunc->parameter) == NULL)
+ goto merr;
+
+ SCRYPT_PARAMS_free(sparam);
+ return keyfunc;
+
+ merr:
+ ASN1err(ASN1_F_PKCS5_SCRYPT_SET, ERR_R_MALLOC_FAILURE);
+ err:
+ SCRYPT_PARAMS_free(sparam);
+ X509_ALGOR_free(keyfunc);
+ return NULL;
+}
+
+int PKCS5_v2_scrypt_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
+ int passlen, ASN1_TYPE *param,
+ const EVP_CIPHER *c, const EVP_MD *md, int en_de)
+{
+ unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
+ uint64_t p, r, N;
+ size_t saltlen;
+ size_t keylen = 0;
+ int rv = 0;
+ SCRYPT_PARAMS *sparam = NULL;
+
+ if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
+ EVPerr(EVP_F_PKCS5_V2_SCRYPT_KEYIVGEN, EVP_R_NO_CIPHER_SET);
+ goto err;
+ }
+
+ /* Decode parameter */
+
+ sparam = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), param);
+
+ if (sparam == NULL) {
+ EVPerr(EVP_F_PKCS5_V2_SCRYPT_KEYIVGEN, EVP_R_DECODE_ERROR);
+ goto err;
+ }
+
+ keylen = EVP_CIPHER_CTX_key_length(ctx);
+
+ /* Now check the parameters of sparam */
+
+ if (sparam->keyLength) {
+ uint64_t spkeylen;
+ if ((ASN1_INTEGER_get_uint64(&spkeylen, sparam->keyLength) == 0)
+ || (spkeylen != keylen)) {
+ EVPerr(EVP_F_PKCS5_V2_SCRYPT_KEYIVGEN,
+ EVP_R_UNSUPPORTED_KEYLENGTH);
+ goto err;
+ }
+ }
+ /* Check all parameters fit in uint64_t and are acceptable to scrypt */
+ if (ASN1_INTEGER_get_uint64(&N, sparam->costParameter) == 0
+ || ASN1_INTEGER_get_uint64(&r, sparam->blockSize) == 0
+ || ASN1_INTEGER_get_uint64(&p, sparam->parallelizationParameter) == 0
+ || EVP_PBE_scrypt(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0) == 0) {
+ EVPerr(EVP_F_PKCS5_V2_SCRYPT_KEYIVGEN,
+ EVP_R_ILLEGAL_SCRYPT_PARAMETERS);
+ goto err;
+ }
+
+ /* it seems that its all OK */
+
+ salt = sparam->salt->data;
+ saltlen = sparam->salt->length;
+ if (EVP_PBE_scrypt(pass, passlen, salt, saltlen, N, r, p, 0, key, keylen)
+ == 0)
+ goto err;
+ rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
+ err:
+ if (keylen)
+ OPENSSL_cleanse(key, keylen);
+ SCRYPT_PARAMS_free(sparam);
+ return rv;
+}
+#endif /* OPENSSL_NO_SCRYPT */
projects / cassiopeia.git / blobdiff