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MODULE = CryptX         PACKAGE = Crypt::PK::Ed25519

PROTOTYPES: DISABLE

Crypt::PK::Ed25519
_new(Class)
    CODE:
    {
        int rv;
        Newz(0, RETVAL, 1, struct ed25519_struct);
        if (!RETVAL) croak("FATAL: Newz failed");
        RETVAL->initialized = 0;
        RETVAL->pindex = find_prng("chacha20");
        RETVAL->key.type = -1;
        if (RETVAL->pindex == -1) {
          Safefree(RETVAL);
          croak("FATAL: find_prng('chacha20') failed");
        }
        rv = rng_make_prng(320, RETVAL->pindex, &RETVAL->pstate, NULL); /* 320bits = 40bytes */
        if (rv != CRYPT_OK) {
          Safefree(RETVAL);
          croak("FATAL: rng_make_prng failed: %s", error_to_string(rv));
        }
    }
    OUTPUT:
        RETVAL

void
generate_key(Crypt::PK::Ed25519 self)
    PPCODE:
    {
        int rv;
        /* gen the key */
        rv = ed25519_make_key(&self->pstate, self->pindex, &self->key);
        if (rv != CRYPT_OK) croak("FATAL: ed25519_make_key failed: %s", error_to_string(rv));
        self->initialized = 1;
        XPUSHs(ST(0)); /* return self */
    }

void
_import(Crypt::PK::Ed25519 self, SV * key_data)
    PPCODE:
    {
        int rv;
        unsigned char *data=NULL;
        STRLEN data_len=0;

        data = (unsigned char *)SvPVbyte(key_data, data_len);
        self->key.type = -1;
        rv = ed25519_import(data, (unsigned long)data_len, &self->key);
        if (rv != CRYPT_OK) croak("FATAL: ed25519_import failed: %s", error_to_string(rv));
        self->initialized = 1;
        XPUSHs(ST(0)); /* return self */
    }

void
_import_pkcs8(Crypt::PK::Ed25519 self, SV * key_data, SV * passwd)
    PPCODE:
    {
        int rv;
        unsigned char *data=NULL, *pwd=NULL;
        STRLEN data_len=0, pwd_len=0;

        data = (unsigned char *)SvPVbyte(key_data, data_len);
        if (SvOK(passwd)) {
          pwd = (unsigned char *)SvPVbyte(passwd, pwd_len);
        }
        self->key.type = -1;
        rv = ed25519_import_pkcs8(data, (unsigned long)data_len, pwd, (unsigned long)pwd_len, &self->key);
        if (rv != CRYPT_OK) croak("FATAL: ed25519_import_pkcs8 failed: %s", error_to_string(rv));
        self->initialized = 1;
        XPUSHs(ST(0)); /* return self */
    }

void
_import_x509(Crypt::PK::Ed25519 self, SV * key_data)
    PPCODE:
    {
        int rv;
        unsigned char *data=NULL;
        STRLEN data_len=0;

        data = (unsigned char *)SvPVbyte(key_data, data_len);
        self->key.type = -1;
        rv = ed25519_import_x509(data, (unsigned long)data_len, &self->key);
        if (rv != CRYPT_OK) croak("FATAL: ed25519_import_x509 failed: %s", error_to_string(rv));
        self->initialized = 1;
        XPUSHs(ST(0)); /* return self */
    }

void
_import_raw(Crypt::PK::Ed25519 self, SV * key, int which)
    PPCODE:
    {
        int rv;
        unsigned char *key_data=NULL;
        STRLEN key_len=0;

        if (SvOK(key)) {
          key_data = (unsigned char *)SvPVbyte(key, key_len);
        }
        if (which == 0) {
          rv = ed25519_import_raw(key_data, (unsigned long)key_len, PK_PUBLIC, &self->key);
        }
        else if (which == 1) {
          rv = ed25519_import_raw(key_data, (unsigned long)key_len, PK_PRIVATE, &self->key);
        }
        else {
          croak("FATAL: import_raw invalid type '%d'", which);
        }
        if (rv != CRYPT_OK) croak("FATAL: ed25519_import_raw failed: %s", error_to_string(rv));
        self->initialized = 1;
        XPUSHs(ST(0)); /* return self */
    }

int
is_private(Crypt::PK::Ed25519 self)
    CODE:
        if (self->initialized == 0 || self->key.type == -1) XSRETURN_UNDEF;
        RETVAL = (self->key.type == PK_PRIVATE) ? 1 : 0;
    OUTPUT:
        RETVAL

SV*
key2hash(Crypt::PK::Ed25519 self)
    PREINIT:
        HV *rv_hash;
        char buf[32 * 2 + 1];
        unsigned long blen;
        SV **not_used;
        int rv;
    CODE:
        if (self->initialized == 0) XSRETURN_UNDEF;
        rv_hash = newHV();
        /* priv */
        if (self->key.type == PK_PRIVATE) {
          blen = sizeof(buf);
          rv = base16_encode(self->key.priv, sizeof(self->key.priv), buf, &blen, 0);
          if (rv != CRYPT_OK) croak("FATAL: base16_encode failed: %s", error_to_string(rv));
          not_used = hv_store(rv_hash, "priv", 4, newSVpv(buf, blen), 0);
        }
        else {
          not_used = hv_store(rv_hash, "priv", 4, &PL_sv_undef, 0);
        }
        /* pub */
        blen = sizeof(buf);
        rv = base16_encode(self->key.pub, sizeof(self->key.pub), buf, &blen, 0);
        if (rv != CRYPT_OK) croak("FATAL: base16_encode failed: %s", error_to_string(rv));
        not_used = hv_store(rv_hash, "pub", 3, newSVpv(buf, blen), 0);
        /* curve */
        not_used = hv_store(rv_hash, "curve", 5, newSVpv("ed25519", 0), 0);
        LTC_UNUSED_PARAM(not_used);
        RETVAL = newRV_noinc((SV*)rv_hash);
    OUTPUT:
        RETVAL

SV*
export_key_der(Crypt::PK::Ed25519 self, char * type)
    CODE:
    {
        int rv;
        unsigned char out[4096];
        unsigned long int out_len = sizeof(out);

        RETVAL = newSVpvn(NULL, 0); /* undef */
        if (strnEQ(type, "private", 7)) {
          rv = ed25519_export(out, &out_len, PK_PRIVATE|PK_STD, &self->key);
          if (rv != CRYPT_OK) croak("FATAL: ed25519_export(PK_PRIVATE|PK_STD) failed: %s", error_to_string(rv));
          RETVAL = newSVpvn((char*)out, out_len);
        }
        else if (strnEQ(type, "public", 6)) {
          rv = ed25519_export(out, &out_len, PK_PUBLIC|PK_STD, &self->key);
          if (rv != CRYPT_OK) croak("FATAL: ed25519_export(PK_PUBLIC|PK_STD) failed: %s", error_to_string(rv));
          RETVAL = newSVpvn((char*)out, out_len);
        }
        else {
          croak("FATAL: export_key_der invalid type '%s'", type);
        }
    }
    OUTPUT:
        RETVAL

SV*
export_key_raw(Crypt::PK::Ed25519 self, char * type)
    CODE:
    {
        int rv;
        unsigned char out[4096];
        unsigned long int out_len = sizeof(out);

        RETVAL = newSVpvn(NULL, 0); /* undef */
        if (strnEQ(type, "private", 7)) {
          rv = ed25519_export(out, &out_len, PK_PRIVATE, &self->key);
          if (rv != CRYPT_OK) croak("FATAL: ed25519_export(PK_PRIVATE) failed: %s", error_to_string(rv));
          RETVAL = newSVpvn((char*)out, out_len);
        }
        else if (strnEQ(type, "public", 6)) {
          rv = ed25519_export(out, &out_len, PK_PUBLIC, &self->key);
          if (rv != CRYPT_OK) croak("FATAL: ed25519_export(PK_PUBLIC) failed: %s", error_to_string(rv));
          RETVAL = newSVpvn((char*)out, out_len);
        }
        else {
          croak("FATAL: export_key_raw invalid type '%s'", type);
        }
    }
    OUTPUT:
        RETVAL

SV *
sign_hash(Crypt::PK::Ed25519 self, SV * data, const char * hash_name = "SHA1")
    ALIAS:
        sign_message = 1
    CODE:
    {
        int rv, id;
        unsigned char buffer[1024], tmp[MAXBLOCKSIZE], *data_ptr = NULL;
        unsigned long tmp_len = MAXBLOCKSIZE, buffer_len = 1024;
        STRLEN data_len = 0;

        data_ptr = (unsigned char *)SvPVbyte(data, data_len);
        if (ix == 1) {
          id = _find_hash(hash_name);
          if (id == -1) croak("FATAL: find_hash failed for '%s'", hash_name);
          rv = hash_memory(id, data_ptr, (unsigned long)data_len, tmp, &tmp_len);
          if (rv != CRYPT_OK) croak("FATAL: hash_memory failed: %s", error_to_string(rv));
          data_ptr = tmp;
          data_len = tmp_len;
        }
        rv = ed25519_sign(data_ptr, (unsigned long)data_len, buffer, &buffer_len, &self->key);
        if (rv != CRYPT_OK) croak("FATAL: ed25519_sign failed: %s", error_to_string(rv));
        RETVAL = newSVpvn((char*)buffer, buffer_len);
    }
    OUTPUT:
        RETVAL

int
verify_hash(Crypt::PK::Ed25519 self, SV * sig, SV * data, const char * hash_name = "SHA1")
    ALIAS:
        verify_message = 1
    CODE:
    {
        int rv, stat, id;
        unsigned char tmp[MAXBLOCKSIZE], *data_ptr = NULL, *sig_ptr = NULL;
        unsigned long tmp_len = MAXBLOCKSIZE;
        STRLEN data_len = 0, sig_len = 0;

        data_ptr = (unsigned char *)SvPVbyte(data, data_len);
        sig_ptr = (unsigned char *)SvPVbyte(sig, sig_len);
        if (ix == 1) {
          id = _find_hash(hash_name);
          if (id == -1) croak("FATAL: find_hash failed for '%s'", hash_name);
          rv = hash_memory(id, data_ptr, (unsigned long)data_len, tmp, &tmp_len);
          if (rv != CRYPT_OK) croak("FATAL: hash_memory failed: %s", error_to_string(rv));
          data_ptr = tmp;
          data_len = tmp_len;
        }
        RETVAL = 1;
        stat = 0;
        rv = ed25519_verify(data_ptr, (unsigned long)data_len, sig_ptr, (unsigned long)sig_len, &stat, &self->key);
        if (rv != CRYPT_OK || stat != 1) RETVAL = 0;
    }
    OUTPUT:
        RETVAL

void
DESTROY(Crypt::PK::Ed25519 self)
    CODE:
        Safefree(self);