

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/rand.h>
#include "crypto/evp.h"

#ifndef OPENSSL_NO_SCRYPT


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),
} ASN1_SEQUENCE_END(SCRYPT_PARAMS)

IMPLEMENT_ASN1_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);



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, *ret = NULL;
    int alg_nid;
    size_t keylen = 0;
    EVP_CIPHER_CTX *ctx = NULL;
    unsigned char iv[EVP_MAX_IV_LENGTH];
    PBE2PARAM *pbe2 = NULL;

    if (!cipher) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
        goto err;
    }

    if (EVP_PBE_scrypt(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0) == 0) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_SCRYPT_PARAMETERS);
        goto err;
    }

    alg_nid = EVP_CIPHER_get_type(cipher);
    if (alg_nid == NID_undef) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
        goto err;
    }

    pbe2 = PBE2PARAM_new();
    if (pbe2 == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    
    scheme = pbe2->encryption;

    scheme->algorithm = OBJ_nid2obj(alg_nid);
    scheme->parameter = ASN1_TYPE_new();
    if (scheme->parameter == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    
    if (EVP_CIPHER_get_iv_length(cipher)) {
        if (aiv)
            memcpy(iv, aiv, EVP_CIPHER_get_iv_length(cipher));
        else if (RAND_bytes(iv, EVP_CIPHER_get_iv_length(cipher)) <= 0)
            goto err;
    }

    ctx = EVP_CIPHER_CTX_new();
    if (ctx == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        goto err;
    }

    
    if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0) == 0)
        goto err;
    if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
        goto err;
    }
    EVP_CIPHER_CTX_free(ctx);
    ctx = NULL;

    

    if (alg_nid == NID_rc2_cbc)
        keylen = EVP_CIPHER_get_key_length(cipher);

    

    X509_ALGOR_free(pbe2->keyfunc);

    pbe2->keyfunc = pkcs5_scrypt_set(salt, saltlen, keylen, N, r, p);

    if (pbe2->keyfunc == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    

    ret = X509_ALGOR_new();
    if (ret == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    ret->algorithm = OBJ_nid2obj(NID_pbes2);

    

    if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
                                &ret->parameter) == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    PBE2PARAM_free(pbe2);
    pbe2 = NULL;

    return ret;

 err:
    PBE2PARAM_free(pbe2);
    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 = SCRYPT_PARAMS_new();

    if (sparam == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    if (!saltlen)
        saltlen = PKCS5_DEFAULT_PBE2_SALT_LEN;

    
    if (ASN1_STRING_set(sparam->salt, salt, saltlen) == 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    if (salt == NULL && RAND_bytes(sparam->salt->data, saltlen) <= 0)
        goto err;

    if (ASN1_INTEGER_set_uint64(sparam->costParameter, N) == 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    if (ASN1_INTEGER_set_uint64(sparam->blockSize, r) == 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    if (ASN1_INTEGER_set_uint64(sparam->parallelizationParameter, p) == 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    

    if (keylen > 0) {
        sparam->keyLength = ASN1_INTEGER_new();
        if (sparam->keyLength == NULL) {
            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
            goto err;
        }
        if (ASN1_INTEGER_set_int64(sparam->keyLength, keylen) == 0) {
            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
            goto err;
        }
    }

    

    keyfunc = X509_ALGOR_new();
    if (keyfunc == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    keyfunc->algorithm = OBJ_nid2obj(NID_id_scrypt);

    

    if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), sparam,
                                &keyfunc->parameter) == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
        goto err;
    }

    SCRYPT_PARAMS_free(sparam);
    return keyfunc;

 err:
    SCRYPT_PARAMS_free(sparam);
    X509_ALGOR_free(keyfunc);
    return NULL;
}

int PKCS5_v2_scrypt_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass,
                                int passlen, ASN1_TYPE *param,
                                const EVP_CIPHER *c, const EVP_MD *md, int en_de,
                                OSSL_LIB_CTX *libctx, const char *propq)
{
    unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
    uint64_t p, r, N;
    size_t saltlen;
    size_t keylen = 0;
    int t, rv = 0;
    SCRYPT_PARAMS *sparam = NULL;

    if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
        goto err;
    }

    

    sparam = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(SCRYPT_PARAMS), param);

    if (sparam == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
        goto err;
    }

    t = EVP_CIPHER_CTX_get_key_length(ctx);
    if (t < 0) {
        ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
        goto err;
    }
    keylen = t;

    

    if (sparam->keyLength) {
        uint64_t spkeylen;
        if ((ASN1_INTEGER_get_uint64(&spkeylen, sparam->keyLength) == 0)
            || (spkeylen != keylen)) {
            ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
            goto err;
        }
    }
    
    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_ex(NULL, 0, NULL, 0, N, r, p, 0, NULL, 0,
                             libctx, propq) == 0) {
        ERR_raise(ERR_LIB_EVP, EVP_R_ILLEGAL_SCRYPT_PARAMETERS);
        goto err;
    }

    

    salt = sparam->salt->data;
    saltlen = sparam->salt->length;
    if (EVP_PBE_scrypt_ex(pass, passlen, salt, saltlen, N, r, p, 0, key,
                          keylen, libctx, propq) == 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;
}

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)
{
    return PKCS5_v2_scrypt_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de, NULL, NULL);
}

#endif 
