138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
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/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/*
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* These are gencrypto-level constants... they are used by both JOSE and direct
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* gencrypto code. However while JWK relies on these, using gencrypto apis has
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* no dependency at all on any JOSE type.
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*/
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enum lws_gencrypto_kty {
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LWS_GENCRYPTO_KTY_UNKNOWN,
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LWS_GENCRYPTO_KTY_OCT,
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LWS_GENCRYPTO_KTY_RSA,
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LWS_GENCRYPTO_KTY_EC
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};
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/*
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* Keytypes where the same element name is reused must all agree to put the
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* same-named element at the same e[] index. It's because when used with jwk,
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* we parse and store in incoming key data, but we may not be informed of the
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* definitive keytype until the end.
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*/
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enum lws_gencrypto_oct_tok {
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LWS_GENCRYPTO_OCT_KEYEL_K, /* note... same offset as AES K */
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LWS_GENCRYPTO_OCT_KEYEL_COUNT
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};
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enum lws_gencrypto_rsa_tok {
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LWS_GENCRYPTO_RSA_KEYEL_E,
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LWS_GENCRYPTO_RSA_KEYEL_N,
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LWS_GENCRYPTO_RSA_KEYEL_D, /* note... same offset as EC D */
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LWS_GENCRYPTO_RSA_KEYEL_P,
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LWS_GENCRYPTO_RSA_KEYEL_Q,
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LWS_GENCRYPTO_RSA_KEYEL_DP,
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LWS_GENCRYPTO_RSA_KEYEL_DQ,
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LWS_GENCRYPTO_RSA_KEYEL_QI,
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/* we don't actively use these if given, but may come from COSE */
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LWS_GENCRYPTO_RSA_KEYEL_OTHER,
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LWS_GENCRYPTO_RSA_KEYEL_RI,
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LWS_GENCRYPTO_RSA_KEYEL_DI,
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LWS_GENCRYPTO_RSA_KEYEL_TI,
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LWS_GENCRYPTO_RSA_KEYEL_COUNT
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};
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enum lws_gencrypto_ec_tok {
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LWS_GENCRYPTO_EC_KEYEL_CRV,
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LWS_GENCRYPTO_EC_KEYEL_X,
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/* note... same offset as RSA D */
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LWS_GENCRYPTO_EC_KEYEL_D = LWS_GENCRYPTO_RSA_KEYEL_D,
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LWS_GENCRYPTO_EC_KEYEL_Y,
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LWS_GENCRYPTO_EC_KEYEL_COUNT
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};
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enum lws_gencrypto_aes_tok {
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/* note... same offset as OCT K */
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LWS_GENCRYPTO_AES_KEYEL_K = LWS_GENCRYPTO_OCT_KEYEL_K,
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LWS_GENCRYPTO_AES_KEYEL_COUNT
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};
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/* largest number of key elements for any algorithm */
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#define LWS_GENCRYPTO_MAX_KEYEL_COUNT LWS_GENCRYPTO_RSA_KEYEL_COUNT
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/* this "stretchy" type holds individual key element data in binary form.
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* It's typcially used in an array with the layout mapping the element index to
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* the key element meaning defined by the enums above. An array of these of
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* length LWS_GENCRYPTO_MAX_KEYEL_COUNT can define key elements for any key
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* type.
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*/
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typedef struct lws_gencrypto_keyelem {
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uint8_t *buf;
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uint32_t len;
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} lws_gc_elem_t;
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/**
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* lws_gencrypto_bits_to_bytes() - returns rounded up bytes needed for bits
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*
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* \param bits
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*
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* Returns the number of bytes needed to store the given number of bits. If
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* a byte is partially used, the byte count is rounded up.
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*/
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LWS_VISIBLE LWS_EXTERN int
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lws_gencrypto_bits_to_bytes(int bits);
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/**
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* lws_base64_size() - returns estimated size of base64 encoding
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*
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* \param bytes
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*
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* Returns a slightly oversize estimate of the size of a base64 encoded version
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* of the given amount of unencoded data.
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*/
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LWS_VISIBLE LWS_EXTERN int
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lws_base64_size(int bytes);
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/**
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* lws_gencrypto_padded_length() - returns PKCS#5/#7 padded length
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*
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* @param blocksize - blocksize to pad to
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* @param len - Length of input to pad
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*
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* Returns the length of a buffer originally of size len after PKCS#5 or PKCS#7
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* padding has been applied to it.
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*/
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LWS_VISIBLE LWS_EXTERN size_t
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lws_gencrypto_padded_length(size_t block_size, size_t len);
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