/* * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (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 #include #include "internal/cryptlib.h" #include #include #include #include #include #include #include "crypto/evp.h" #include "evp_local.h" int pkcs5_pbkdf2_hmac_ex(const char *pass, int passlen, const unsigned char *salt, int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out, OSSL_LIB_CTX *libctx, const char *propq) { const char *empty = ""; int rv = 1, mode = 1; EVP_KDF *kdf; EVP_KDF_CTX *kctx; const char *mdname = EVP_MD_name(digest); OSSL_PARAM params[6], *p = params; /* Keep documented behaviour. */ if (pass == NULL) { pass = empty; passlen = 0; } else if (passlen == -1) { passlen = strlen(pass); } if (salt == NULL && saltlen == 0) salt = (unsigned char *)empty; kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq); kctx = EVP_KDF_CTX_new(kdf); EVP_KDF_free(kdf); if (kctx == NULL) return 0; *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, (char *)pass, (size_t)passlen); *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, (unsigned char *)salt, saltlen); *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter); *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, (char *)mdname, 0); *p = OSSL_PARAM_construct_end(); if (EVP_KDF_CTX_set_params(kctx, params) != 1 || EVP_KDF_derive(kctx, out, keylen) != 1) rv = 0; EVP_KDF_CTX_free(kctx); OSSL_TRACE_BEGIN(PKCS5V2) { BIO_printf(trc_out, "Password:\n"); BIO_hex_string(trc_out, 0, passlen, pass, passlen); BIO_printf(trc_out, "\n"); BIO_printf(trc_out, "Salt:\n"); BIO_hex_string(trc_out, 0, saltlen, salt, saltlen); BIO_printf(trc_out, "\n"); BIO_printf(trc_out, "Iteration count %d\n", iter); BIO_printf(trc_out, "Key:\n"); BIO_hex_string(trc_out, 0, keylen, out, keylen); BIO_printf(trc_out, "\n"); } OSSL_TRACE_END(PKCS5V2); return rv; } int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt, int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out) { return pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, digest, keylen, out, NULL, NULL); } int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt, int saltlen, int iter, int keylen, unsigned char *out) { return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(), keylen, out); } /* * Now the key derivation function itself. This is a bit evil because it has * to check the ASN1 parameters are valid: and there are quite a few of * them... */ int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen, ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de) { PBE2PARAM *pbe2 = NULL; const EVP_CIPHER *cipher; EVP_PBE_KEYGEN *kdf; int rv = 0; pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param); if (pbe2 == NULL) { ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR); goto err; } /* See if we recognise the key derivation function */ if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm), NULL, NULL, &kdf)) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION); goto err; } /* * lets see if we recognise the encryption algorithm. */ cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm); if (!cipher) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER); goto err; } /* Fixup cipher based on AlgorithmIdentifier */ if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de)) goto err; if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) { ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR); goto err; } rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de); err: PBE2PARAM_free(pbe2); return rv; } int PKCS5_v2_PBKDF2_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]; int saltlen, iter, t; int rv = 0; unsigned int keylen = 0; int prf_nid, hmac_md_nid; PBKDF2PARAM *kdf = NULL; const EVP_MD *prfmd; if (EVP_CIPHER_CTX_cipher(ctx) == NULL) { ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET); goto err; } keylen = EVP_CIPHER_CTX_key_length(ctx); OPENSSL_assert(keylen <= sizeof(key)); /* Decode parameter */ kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param); if (kdf == NULL) { ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR); goto err; } t = EVP_CIPHER_CTX_key_length(ctx); if (t < 0) { ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH); goto err; } keylen = t; /* Now check the parameters of the kdf */ if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH); goto err; } if (kdf->prf) prf_nid = OBJ_obj2nid(kdf->prf->algorithm); else prf_nid = NID_hmacWithSHA1; if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF); goto err; } prfmd = EVP_get_digestbynid(hmac_md_nid); if (prfmd == NULL) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF); goto err; } if (kdf->salt->type != V_ASN1_OCTET_STRING) { ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_SALT_TYPE); goto err; } /* it seems that its all OK */ salt = kdf->salt->value.octet_string->data; saltlen = kdf->salt->value.octet_string->length; iter = ASN1_INTEGER_get(kdf->iter); if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd, keylen, key)) goto err; rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de); err: OPENSSL_cleanse(key, keylen); PBKDF2PARAM_free(kdf); return rv; }