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qjs_webcrypto_module.c
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/*
* Copyright (C) Dmitry Volyntsev
* Copyright (C) F5, Inc.
*/
#include <qjs.h>
#include <njs_sprintf.h>
#include "njs_openssl.h"
typedef enum {
QJS_KEY_FORMAT_RAW = 1 << 1,
QJS_KEY_FORMAT_PKCS8 = 1 << 2,
QJS_KEY_FORMAT_SPKI = 1 << 3,
QJS_KEY_FORMAT_JWK = 1 << 4,
QJS_KEY_FORMAT_UNKNOWN = 1 << 5,
} qjs_webcrypto_key_format_t;
typedef enum {
QJS_KEY_JWK_KTY_RSA,
QJS_KEY_JWK_KTY_EC,
QJS_KEY_JWK_KTY_OCT,
QJS_KEY_JWK_KTY_UNKNOWN,
} qjs_webcrypto_jwk_kty_t;
typedef enum {
QJS_KEY_USAGE_DECRYPT = 1 << 1,
QJS_KEY_USAGE_DERIVE_BITS = 1 << 2,
QJS_KEY_USAGE_DERIVE_KEY = 1 << 3,
QJS_KEY_USAGE_ENCRYPT = 1 << 4,
QJS_KEY_USAGE_GENERATE_KEY = 1 << 5,
QJS_KEY_USAGE_SIGN = 1 << 6,
QJS_KEY_USAGE_VERIFY = 1 << 7,
QJS_KEY_USAGE_WRAP_KEY = 1 << 8,
QJS_KEY_USAGE_UNSUPPORTED = 1 << 9,
QJS_KEY_USAGE_UNWRAP_KEY = 1 << 10,
} qjs_webcrypto_key_usage_t;
typedef enum {
QJS_ALGORITHM_RSASSA_PKCS1_v1_5 = 0,
QJS_ALGORITHM_RSA_PSS,
QJS_ALGORITHM_RSA_OAEP,
QJS_ALGORITHM_HMAC,
QJS_ALGORITHM_AES_GCM,
QJS_ALGORITHM_AES_CTR,
QJS_ALGORITHM_AES_CBC,
QJS_ALGORITHM_ECDSA,
QJS_ALGORITHM_ECDH,
QJS_ALGORITHM_PBKDF2,
QJS_ALGORITHM_HKDF,
QJS_ALGORITHM_MAX,
} qjs_webcrypto_alg_t;
typedef enum {
QJS_HASH_UNSET = 0,
QJS_HASH_SHA1,
QJS_HASH_SHA256,
QJS_HASH_SHA384,
QJS_HASH_SHA512,
QJS_HASH_MAX,
} qjs_webcrypto_hash_t;
typedef struct {
njs_str_t name;
uintptr_t value;
} qjs_webcrypto_entry_t;
typedef struct {
qjs_webcrypto_alg_t type;
unsigned usage;
unsigned fmt;
unsigned raw;
} qjs_webcrypto_algorithm_t;
typedef struct {
qjs_webcrypto_algorithm_t *alg;
unsigned usage;
int extractable;
qjs_webcrypto_hash_t hash;
union {
struct {
EVP_PKEY *pkey;
int privat;
int curve;
} a;
struct {
njs_str_t raw;
} s;
} u;
} qjs_webcrypto_key_t;
typedef int (*EVP_PKEY_cipher_init_t)(EVP_PKEY_CTX *ctx);
typedef int (*EVP_PKEY_cipher_t)(EVP_PKEY_CTX *ctx, unsigned char *out,
size_t *outlen, const unsigned char *in, size_t inlen);
static JSValue qjs_webcrypto_cipher(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv, int encrypt);
static JSValue qjs_cipher_pkey(JSContext *cx, njs_str_t *data,
qjs_webcrypto_key_t *key, int encrypt);
static JSValue qjs_cipher_aes_gcm(JSContext *cx, njs_str_t *data,
qjs_webcrypto_key_t *key, JSValue options, int encrypt);
static JSValue qjs_cipher_aes_ctr(JSContext *cx, njs_str_t *data,
qjs_webcrypto_key_t *key, JSValue options, int encrypt);
static JSValue qjs_cipher_aes_cbc(JSContext *cx, njs_str_t *data,
qjs_webcrypto_key_t *key, JSValue options, int encrypt);
static JSValue qjs_webcrypto_derive(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv, int derive_key);
static JSValue qjs_webcrypto_digest(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv);
static JSValue qjs_webcrypto_export_key(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv);
static JSValue qjs_webcrypto_generate_key(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv);
static JSValue qjs_webcrypto_import_key(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv);
static JSValue qjs_webcrypto_sign(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv, int verify);
static JSValue qjs_webcrypto_key_to_string_tag(JSContext *cx,
JSValueConst this_val);
static JSValue qjs_webcrypto_key_algorithm(JSContext *cx,
JSValueConst this_val);
static JSValue qjs_webcrypto_key_extractable(JSContext *cx,
JSValueConst this_val);
static JSValue qjs_webcrypto_key_type(JSContext *cx, JSValueConst this_val);
static JSValue qjs_webcrypto_key_usages(JSContext *cx, JSValueConst this_val);
static JSValue qjs_get_random_values(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv);
static JSValue qjs_webcrypto_key_make(JSContext *cx,
qjs_webcrypto_algorithm_t *alg, unsigned usage, int extractable);
static void qjs_webcrypto_key_finalizer(JSRuntime *rt, JSValue val);
static qjs_webcrypto_key_format_t qjs_key_format(JSContext *cx,
JSValueConst value);
static qjs_webcrypto_jwk_kty_t qjs_jwk_kty(JSContext *cx, JSValueConst value);
static qjs_webcrypto_algorithm_t *qjs_key_algorithm(JSContext *cx, JSValue val);
static JSValue qjs_algorithm_curve(JSContext *cx, JSValue options, int *curve);
static JSValue qjs_algorithm_hash(JSContext *cx, JSValue options,
qjs_webcrypto_hash_t *hash);
static const EVP_MD *qjs_algorithm_hash_digest(qjs_webcrypto_hash_t hash);
static njs_str_t *qjs_algorithm_curve_name(int curve);
static const char *qjs_format_string(qjs_webcrypto_key_format_t fmt);
static const char *qjs_algorithm_string(qjs_webcrypto_algorithm_t *algorithm);
static const char *qjs_algorithm_hash_name(qjs_webcrypto_hash_t hash);
static JSValue qjs_key_usage(JSContext *cx, JSValue value, unsigned *mask);
static JSValue qjs_key_ops(JSContext *cx, unsigned mask);
static JSValue qjs_webcrypto_result(JSContext *cx, JSValue result, int rc);
static void qjs_webcrypto_error(JSContext *cx, const char *fmt, ...);
static JSModuleDef *qjs_webcrypto_init(JSContext *cx, const char *name);
static qjs_webcrypto_entry_t qjs_webcrypto_alg[] = {
#define qjs_webcrypto_algorithm(type, usage, fmt, raw) \
(uintptr_t) & (qjs_webcrypto_algorithm_t) { type, usage, fmt, raw }
{
njs_str("RSASSA-PKCS1-v1_5"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_RSASSA_PKCS1_v1_5,
QJS_KEY_USAGE_SIGN |
QJS_KEY_USAGE_VERIFY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_PKCS8 |
QJS_KEY_FORMAT_SPKI |
QJS_KEY_FORMAT_JWK,
0)
},
{
njs_str("RSA-PSS"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_RSA_PSS,
QJS_KEY_USAGE_SIGN |
QJS_KEY_USAGE_VERIFY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_PKCS8 |
QJS_KEY_FORMAT_SPKI |
QJS_KEY_FORMAT_JWK,
0)
},
{
njs_str("RSA-OAEP"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_RSA_OAEP,
QJS_KEY_USAGE_ENCRYPT |
QJS_KEY_USAGE_DECRYPT |
QJS_KEY_USAGE_WRAP_KEY |
QJS_KEY_USAGE_UNWRAP_KEY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_PKCS8 |
QJS_KEY_FORMAT_SPKI |
QJS_KEY_FORMAT_JWK,
0)
},
{
njs_str("HMAC"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_HMAC,
QJS_KEY_USAGE_GENERATE_KEY |
QJS_KEY_USAGE_SIGN |
QJS_KEY_USAGE_VERIFY,
QJS_KEY_FORMAT_RAW |
QJS_KEY_FORMAT_JWK,
1)
},
{
njs_str("AES-GCM"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_AES_GCM,
QJS_KEY_USAGE_ENCRYPT |
QJS_KEY_USAGE_DECRYPT |
QJS_KEY_USAGE_WRAP_KEY |
QJS_KEY_USAGE_UNWRAP_KEY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_RAW |
QJS_KEY_FORMAT_JWK,
1)
},
{
njs_str("AES-CTR"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_AES_CTR,
QJS_KEY_USAGE_ENCRYPT |
QJS_KEY_USAGE_DECRYPT |
QJS_KEY_USAGE_WRAP_KEY |
QJS_KEY_USAGE_UNWRAP_KEY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_RAW |
QJS_KEY_FORMAT_JWK,
1)
},
{
njs_str("AES-CBC"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_AES_CBC,
QJS_KEY_USAGE_ENCRYPT |
QJS_KEY_USAGE_DECRYPT |
QJS_KEY_USAGE_WRAP_KEY |
QJS_KEY_USAGE_UNWRAP_KEY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_RAW |
QJS_KEY_FORMAT_JWK,
1)
},
{
njs_str("ECDSA"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_ECDSA,
QJS_KEY_USAGE_SIGN |
QJS_KEY_USAGE_VERIFY |
QJS_KEY_USAGE_GENERATE_KEY,
QJS_KEY_FORMAT_PKCS8 |
QJS_KEY_FORMAT_SPKI |
QJS_KEY_FORMAT_RAW |
QJS_KEY_FORMAT_JWK,
0)
},
{
njs_str("ECDH"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_ECDH,
QJS_KEY_USAGE_DERIVE_KEY |
QJS_KEY_USAGE_DERIVE_BITS |
QJS_KEY_USAGE_GENERATE_KEY |
QJS_KEY_USAGE_UNSUPPORTED,
QJS_KEY_FORMAT_UNKNOWN,
0)
},
{
njs_str("PBKDF2"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_PBKDF2,
QJS_KEY_USAGE_DERIVE_KEY |
QJS_KEY_USAGE_DERIVE_BITS,
QJS_KEY_FORMAT_RAW,
1)
},
{
njs_str("HKDF"),
qjs_webcrypto_algorithm(QJS_ALGORITHM_HKDF,
QJS_KEY_USAGE_DERIVE_KEY |
QJS_KEY_USAGE_DERIVE_BITS,
QJS_KEY_FORMAT_RAW,
1)
},
{
njs_null_str,
0
}
};
static qjs_webcrypto_entry_t qjs_webcrypto_hash[] = {
{ njs_str("SHA-256"), QJS_HASH_SHA256 },
{ njs_str("SHA-384"), QJS_HASH_SHA384 },
{ njs_str("SHA-512"), QJS_HASH_SHA512 },
{ njs_str("SHA-1"), QJS_HASH_SHA1 },
{ njs_null_str, 0 }
};
static qjs_webcrypto_entry_t qjs_webcrypto_curve[] = {
{ njs_str("P-256"), NID_X9_62_prime256v1 },
{ njs_str("P-384"), NID_secp384r1 },
{ njs_str("P-521"), NID_secp521r1 },
{ njs_null_str, 0 }
};
static qjs_webcrypto_entry_t qjs_webcrypto_format[] = {
{ njs_str("raw"), QJS_KEY_FORMAT_RAW },
{ njs_str("pkcs8"), QJS_KEY_FORMAT_PKCS8 },
{ njs_str("spki"), QJS_KEY_FORMAT_SPKI },
{ njs_str("jwk"), QJS_KEY_FORMAT_JWK },
{ njs_null_str, QJS_KEY_FORMAT_UNKNOWN }
};
static qjs_webcrypto_entry_t qjs_webcrypto_jwk_kty[] = {
{ njs_str("RSA"), QJS_KEY_JWK_KTY_RSA },
{ njs_str("EC"), QJS_KEY_JWK_KTY_EC },
{ njs_str("oct"), QJS_KEY_JWK_KTY_OCT },
{ njs_null_str, QJS_KEY_JWK_KTY_UNKNOWN }
};
static qjs_webcrypto_entry_t qjs_webcrypto_usage[] = {
{ njs_str("decrypt"), QJS_KEY_USAGE_DECRYPT },
{ njs_str("deriveBits"), QJS_KEY_USAGE_DERIVE_BITS },
{ njs_str("deriveKey"), QJS_KEY_USAGE_DERIVE_KEY },
{ njs_str("encrypt"), QJS_KEY_USAGE_ENCRYPT },
{ njs_str("sign"), QJS_KEY_USAGE_SIGN },
{ njs_str("unwrapKey"), QJS_KEY_USAGE_UNWRAP_KEY },
{ njs_str("verify"), QJS_KEY_USAGE_VERIFY },
{ njs_str("wrapKey"), QJS_KEY_USAGE_WRAP_KEY },
{ njs_null_str, 0 }
};
static qjs_webcrypto_entry_t qjs_webcrypto_alg_hash[] = {
{ njs_str("RS1"), QJS_HASH_SHA1 },
{ njs_str("RS256"), QJS_HASH_SHA256 },
{ njs_str("RS384"), QJS_HASH_SHA384 },
{ njs_str("RS512"), QJS_HASH_SHA512 },
{ njs_str("PS1"), QJS_HASH_SHA1 },
{ njs_str("PS256"), QJS_HASH_SHA256 },
{ njs_str("PS384"), QJS_HASH_SHA384 },
{ njs_str("PS512"), QJS_HASH_SHA512 },
{ njs_str("RSA-OAEP"), QJS_HASH_SHA1 },
{ njs_str("RSA-OAEP-256"), QJS_HASH_SHA256 },
{ njs_str("RSA-OAEP-384"), QJS_HASH_SHA384 },
{ njs_str("RSA-OAEP-512"), QJS_HASH_SHA512 },
{ njs_null_str, 0 }
};
static njs_str_t
qjs_webcrypto_alg_name[QJS_ALGORITHM_HMAC + 1][QJS_HASH_MAX] = {
{
njs_null_str,
njs_str("RS1"),
njs_str("RS256"),
njs_str("RS384"),
njs_str("RS512"),
},
{
njs_null_str,
njs_str("PS1"),
njs_str("PS256"),
njs_str("PS384"),
njs_str("PS512"),
},
{
njs_null_str,
njs_str("RSA-OAEP"),
njs_str("RSA-OAEP-256"),
njs_str("RSA-OAEP-384"),
njs_str("RSA-OAEP-512"),
},
{
njs_null_str,
njs_str("HS1"),
njs_str("HS256"),
njs_str("HS384"),
njs_str("HS512"),
},
};
static njs_str_t qjs_webcrypto_alg_aes_name[3][3 + 1] = {
{
njs_str("A128GCM"),
njs_str("A192GCM"),
njs_str("A256GCM"),
njs_null_str,
},
{
njs_str("A128CTR"),
njs_str("A192CTR"),
njs_str("A256CTR"),
njs_null_str,
},
{
njs_str("A128CBC"),
njs_str("A192CBC"),
njs_str("A256CBC"),
njs_null_str,
},
};
static const JSCFunctionListEntry qjs_webcrypto_subtle[] = {
JS_CFUNC_DEF("importKey", 5, qjs_webcrypto_import_key),
JS_CFUNC_MAGIC_DEF("decrypt", 4, qjs_webcrypto_cipher, 0),
JS_CFUNC_MAGIC_DEF("deriveBits", 4, qjs_webcrypto_derive, 0),
JS_CFUNC_MAGIC_DEF("deriveKey", 4, qjs_webcrypto_derive, 1),
JS_CFUNC_DEF("digest", 3, qjs_webcrypto_digest),
JS_CFUNC_MAGIC_DEF("encrypt", 4, qjs_webcrypto_cipher, 1),
JS_CFUNC_DEF("exportKey", 3, qjs_webcrypto_export_key),
JS_CFUNC_DEF("generateKey", 3, qjs_webcrypto_generate_key),
JS_CFUNC_MAGIC_DEF("sign", 4, qjs_webcrypto_sign, 0),
JS_CFUNC_MAGIC_DEF("verify", 4, qjs_webcrypto_sign, 1),
};
static const JSCFunctionListEntry qjs_webcrypto_key_proto[] = {
JS_CGETSET_DEF("[Symbol.toStringTag]", qjs_webcrypto_key_to_string_tag,
NULL),
JS_CGETSET_DEF("algorithm", qjs_webcrypto_key_algorithm, NULL),
JS_CGETSET_DEF("extractable", qjs_webcrypto_key_extractable, NULL),
JS_CGETSET_DEF("type", qjs_webcrypto_key_type, NULL),
JS_CGETSET_DEF("usages", qjs_webcrypto_key_usages, NULL),
};
static const JSCFunctionListEntry qjs_webcrypto_export[] = {
JS_CFUNC_DEF("getRandomValues", 1, qjs_get_random_values),
JS_OBJECT_DEF("subtle",
qjs_webcrypto_subtle,
njs_nitems(qjs_webcrypto_subtle),
JS_PROP_CONFIGURABLE),
};
static JSClassDef qjs_webcrypto_key_class = {
"WebCryptoKey",
.finalizer = qjs_webcrypto_key_finalizer,
};
qjs_module_t qjs_webcrypto_module = {
.name = "webcrypto",
.init = qjs_webcrypto_init,
};
static JSValue
qjs_webcrypto_cipher(JSContext *cx, JSValueConst this_val,
int argc, JSValueConst *argv, int encrypt)
{
unsigned mask;
JSValue ret, options;
njs_str_t data;
qjs_webcrypto_key_t *key;
qjs_webcrypto_algorithm_t *alg;
options = argv[0];
alg = qjs_key_algorithm(cx, options);
if (alg == NULL) {
goto fail;
}
key = JS_GetOpaque(argv[1], QJS_CORE_CLASS_ID_WEBCRYPTO_KEY);
if (key == NULL) {
JS_ThrowTypeError(cx, "key is not a CryptoKey object");
goto fail;
}
mask = encrypt ? QJS_KEY_USAGE_ENCRYPT : QJS_KEY_USAGE_DECRYPT;
if ((key->usage & mask) != mask) {
JS_ThrowTypeError(cx, "key does not support %s operation",
encrypt ? "encrypt" : "decrypt");
goto fail;
}
if (key->alg != alg) {
JS_ThrowTypeError(cx, "cannot %s use \"%s\" with \"%s\" key",
encrypt ? "encrypt" : "decrypt",
qjs_algorithm_string(key->alg),
qjs_algorithm_string(alg));
goto fail;
}
ret = qjs_typed_array_data(cx, argv[2], &data);
if (JS_IsException(ret)) {
return ret;
}
switch (alg->type) {
case QJS_ALGORITHM_RSA_OAEP:
ret = qjs_cipher_pkey(cx, &data, key, encrypt);
if (JS_IsException(ret)) {
goto fail;
}
break;
case QJS_ALGORITHM_AES_GCM:
ret = qjs_cipher_aes_gcm(cx, &data, key, options, encrypt);
if (JS_IsException(ret)) {
goto fail;
}
break;
case QJS_ALGORITHM_AES_CTR:
ret = qjs_cipher_aes_ctr(cx, &data, key, options, encrypt);
if (JS_IsException(ret)) {
goto fail;
}
break;
case QJS_ALGORITHM_AES_CBC:
default:
ret = qjs_cipher_aes_cbc(cx, &data, key, options, encrypt);
if (JS_IsException(ret)) {
goto fail;
}
}
return qjs_webcrypto_result(cx, ret, 0);
fail:
return qjs_webcrypto_result(cx, JS_UNDEFINED, -1);
}
static JSValue
qjs_cipher_pkey(JSContext *cx, njs_str_t *data, qjs_webcrypto_key_t *key,
int encrypt)
{
int rc;
u_char *dst;
size_t outlen;
JSValue ret;
const EVP_MD *md;
EVP_PKEY_CTX *ctx;
EVP_PKEY_cipher_t cipher;
EVP_PKEY_cipher_init_t init;
ctx = EVP_PKEY_CTX_new(key->u.a.pkey, NULL);
if (ctx == NULL) {
qjs_webcrypto_error(cx, "EVP_PKEY_CTX_new() failed");
return JS_EXCEPTION;
}
if (encrypt) {
init = EVP_PKEY_encrypt_init;
cipher = EVP_PKEY_encrypt;
} else {
init = EVP_PKEY_decrypt_init;
cipher = EVP_PKEY_decrypt;
}
rc = init(ctx);
if (rc <= 0) {
qjs_webcrypto_error(cx, "EVP_PKEY_%scrypt_init() failed",
encrypt ? "en" : "de");
ret = JS_EXCEPTION;
goto fail;
}
md = qjs_algorithm_hash_digest(key->hash);
EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING);
EVP_PKEY_CTX_set_signature_md(ctx, md);
EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
rc = cipher(ctx, NULL, &outlen, data->start, data->length);
if (rc <= 0) {
qjs_webcrypto_error(cx, "EVP_PKEY_%scrypt() failed",
encrypt ? "en" : "de");
ret = JS_EXCEPTION;
goto fail;
}
dst = js_malloc(cx, outlen);
if (dst == NULL) {
JS_ThrowOutOfMemory(cx);
ret = JS_EXCEPTION;
goto fail;
}
rc = cipher(ctx, dst, &outlen, data->start, data->length);
if (rc <= 0) {
qjs_webcrypto_error(cx, "EVP_PKEY_%scrypt() failed",
encrypt ? "en" : "de");
js_free(cx, dst);
ret = JS_EXCEPTION;
goto fail;
}
ret = qjs_new_array_buffer(cx, dst, outlen);
fail:
EVP_PKEY_CTX_free(ctx);
return ret;
}
static JSValue
qjs_cipher_aes_gcm(JSContext *cx, njs_str_t *data, qjs_webcrypto_key_t *key,
JSValue options, int encrypt)
{
int len, outlen, dstlen;
u_char *dst, *p;
JSValue ret, value;
int64_t taglen;
njs_str_t iv, aad;
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *cipher;
switch (key->u.s.raw.length) {
case 16:
cipher = EVP_aes_128_gcm();
break;
case 24:
cipher = EVP_aes_192_gcm();
break;
case 32:
cipher = EVP_aes_256_gcm();
break;
default:
JS_ThrowTypeError(cx, "AES-GCM invalid key length");
return JS_EXCEPTION;
}
value = JS_GetPropertyStr(cx, options, "iv");
if (JS_IsException(value)) {
return JS_EXCEPTION;
}
if (JS_IsUndefined(value)) {
JS_ThrowTypeError(cx, "AES-GCM algorithm.iv is not provided");
return JS_EXCEPTION;
}
ret = qjs_typed_array_data(cx, value, &iv);
if (JS_IsException(ret)) {
return JS_EXCEPTION;
}
JS_FreeValue(cx, value);
taglen = 128;
value = JS_GetPropertyStr(cx, options, "tagLength");
if (JS_IsException(value)) {
return JS_EXCEPTION;
}
if (!JS_IsUndefined(value)) {
if (JS_ToInt64(cx, &taglen, value) < 0) {
return JS_EXCEPTION;
}
}
if (taglen != 32 && taglen != 64 && taglen != 96 && taglen != 104
&& taglen != 112 && taglen != 120 && taglen != 128)
{
JS_ThrowTypeError(cx, "AES-GCM invalid tagLength");
return JS_EXCEPTION;
}
taglen /= 8;
if (!encrypt && data->length < (size_t) taglen) {
JS_ThrowTypeError(cx, "AES-GCM data is too short");
return JS_EXCEPTION;
}
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
qjs_webcrypto_error(cx, "EVP_CIPHER_CTX_new() failed");
return JS_EXCEPTION;
}
if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, encrypt) <= 0) {
qjs_webcrypto_error(cx, "EVP_%sInit_ex() failed",
encrypt ? "Encrypt" : "Decrypt");
goto fail;
}
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, iv.length, NULL) <= 0) {
qjs_webcrypto_error(cx, "EVP_CIPHER_CTX_ctrl() failed");
goto fail;
}
if (EVP_CipherInit_ex(ctx, NULL, NULL, key->u.s.raw.start, iv.start,
encrypt) <= 0)
{
qjs_webcrypto_error(cx, "EVP_%sInit_ex() failed",
encrypt ? "Encrypt" : "Decrypt");
goto fail;
}
if (!encrypt) {
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, taglen,
&data->start[data->length - taglen]) <= 0)
{
qjs_webcrypto_error(cx, "EVP_CIPHER_CTX_ctrl() failed");
goto fail;
}
}
aad.length = 0;
value = JS_GetPropertyStr(cx, options, "additionalData");
if (JS_IsException(value)) {
goto fail;
}
if (!JS_IsUndefined(value)) {
ret = qjs_typed_array_data(cx, value, &aad);
if (JS_IsException(ret)) {
goto fail;
}
}
JS_FreeValue(cx, value);
if (aad.length != 0) {
if (EVP_CipherUpdate(ctx, NULL, &outlen, aad.start, aad.length) <= 0) {
qjs_webcrypto_error(cx, "EVP_%sUpdate() failed",
encrypt ? "Encrypt" : "Decrypt");
goto fail;
}
}
dstlen = data->length + EVP_CIPHER_CTX_block_size(ctx) + taglen;
dst = js_malloc(cx, dstlen);
if (dst == NULL) {
JS_ThrowOutOfMemory(cx);
goto fail;
}
if (EVP_CipherUpdate(ctx, dst, &outlen, data->start,
data->length - (encrypt ? 0 : taglen)) <= 0)
{
qjs_webcrypto_error(cx, "EVP_%sUpdate() failed",
encrypt ? "Encrypt" : "Decrypt");
js_free(cx, dst);
goto fail;
}
p = &dst[outlen];
len = EVP_CIPHER_CTX_block_size(ctx);
if (EVP_CipherFinal_ex(ctx, p, &len) <= 0) {
qjs_webcrypto_error(cx, "EVP_%sFinal_ex() failed",
encrypt ? "Encrypt" : "Decrypt");
js_free(cx, dst);
goto fail;
}
outlen += len;
p += len;
if (encrypt) {
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, taglen, p) <= 0) {
qjs_webcrypto_error(cx, "EVP_CIPHER_CTX_ctrl() failed");
js_free(cx, dst);
goto fail;
}
outlen += taglen;
}
ret = qjs_new_array_buffer(cx, dst, outlen);
EVP_CIPHER_CTX_free(ctx);
return ret;
fail:
EVP_CIPHER_CTX_free(ctx);
return JS_EXCEPTION;
}
static int
qjs_cipher_aes_ctr128(JSContext *cx, const EVP_CIPHER *cipher, u_char *key,
u_char *data, size_t dlen, u_char *counter, u_char *dst, int *olen,
int encrypt)
{
int len, outlen;
int ret;
EVP_CIPHER_CTX *ctx;
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
qjs_webcrypto_error(cx, "EVP_CIPHER_CTX_new() failed");
return -1;
}
ret = EVP_CipherInit_ex(ctx, cipher, NULL, key, counter, encrypt);
if (ret <= 0) {
qjs_webcrypto_error(cx, "EVP_%sInit_ex() failed",
encrypt ? "Encrypt" : "Decrypt");
ret = -1;
goto fail;
}
ret = EVP_CipherUpdate(ctx, dst, &outlen, data, dlen);
if (ret <= 0) {
qjs_webcrypto_error(cx, "EVP_%sUpdate() failed",
encrypt ? "Encrypt" : "Decrypt");
ret = -1;
goto fail;
}
ret = EVP_CipherFinal_ex(ctx, &dst[outlen], &len);
if (ret <= 0) {
qjs_webcrypto_error(cx, "EVP_%sFinal_ex() failed",
encrypt ? "Encrypt" : "Decrypt");
ret = -1;
goto fail;
}
outlen += len;
*olen = outlen;
ret = 0;
fail:
EVP_CIPHER_CTX_free(ctx);
return ret;
}
static BIGNUM *
qjs_bn_counter128(njs_str_t *ctr, unsigned bits)
{
unsigned remainder, bytes;
uint8_t buf[16];
remainder = bits % 8;
if (remainder == 0) {
bytes = bits / 8;
return BN_bin2bn(&ctr->start[ctr->length - bytes], bytes, NULL);
}
bytes = (bits + 7) / 8;
memcpy(buf, &ctr->start[ctr->length - bytes], bytes);
buf[0] &= ~(0xFF << remainder);
return BN_bin2bn(buf, bytes, NULL);
}
njs_inline unsigned
qjs_ceiling_div(unsigned dend, unsigned dsor)
{
return (dsor == 0) ? 0 : 1 + (dend - 1) / dsor;
}
static void
qjs_counter128_reset(u_char *src, u_char *dst, unsigned bits)
{
size_t index;
unsigned remainder, bytes;
bytes = bits / 8;
remainder = bits % 8;
memcpy(dst, src, 16);
index = 16 - bytes;
memset(&dst[index], 0, bytes);
if (remainder) {
dst[index - 1] &= 0xff << remainder;
}
}
static JSValue
qjs_cipher_aes_ctr(JSContext *cx, njs_str_t *data, qjs_webcrypto_key_t *key,
JSValue options, int encrypt)
{
int len, len2;
u_char *dst;
BIGNUM *total, *blocks, *left, *ctr;
size_t size1;
JSValue ret, value;
int64_t length;
njs_str_t iv;
const EVP_CIPHER *cipher;
u_char iv2[16];
switch (key->u.s.raw.length) {
case 16:
cipher = EVP_aes_128_ctr();
break;
case 24:
cipher = EVP_aes_192_ctr();
break;
case 32:
cipher = EVP_aes_256_ctr();
break;
default:
JS_ThrowTypeError(cx, "AES-CTR invalid key length");
return JS_EXCEPTION;
}
value = JS_GetPropertyStr(cx, options, "counter");
if (JS_IsException(value)) {
return JS_EXCEPTION;
}
if (JS_IsUndefined(value)) {
JS_ThrowTypeError(cx, "AES-CTR algorithm.counter is not provided");
return JS_EXCEPTION;
}
ret = qjs_typed_array_data(cx, value, &iv);
if (JS_IsException(ret)) {
return JS_EXCEPTION;
}
JS_FreeValue(cx, value);
if (iv.length != 16) {
JS_ThrowTypeError(cx, "AES-CTR algorithm.counter must be 16 bytes "
"long");
return JS_EXCEPTION;
}
value = JS_GetPropertyStr(cx, options, "length");
if (JS_IsException(value)) {
return JS_EXCEPTION;
}
if (JS_IsUndefined(value)) {
JS_ThrowTypeError(cx, "AES-CTR algorithm.length is not provided");
return JS_EXCEPTION;
}
if (JS_ToInt64(cx, &length, value) < 0) {
return JS_EXCEPTION;
}
if (length == 0 || length > 128) {
JS_ThrowTypeError(cx, "AES-CTR algorithm.length must be between "
"1 and 128");
return JS_EXCEPTION;
}
ctr = NULL;