mirror of https://github.com/openssl/openssl
101 lines
4.1 KiB
C
101 lines
4.1 KiB
C
/*
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* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_INTERNAL_HPKE_UTIL_H
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# define OSSL_INTERNAL_HPKE_UTIL_H
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# pragma once
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/* Constants from RFC 9180 Section 7.1 and 7.3 */
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# define OSSL_HPKE_MAX_SECRET 64
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# define OSSL_HPKE_MAX_PUBLIC 133
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# define OSSL_HPKE_MAX_PRIVATE 66
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# define OSSL_HPKE_MAX_KDF_INPUTLEN 64
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/*
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* max length of a base-nonce (the Nn field from OSSL_HPKE_AEAD_INFO), this
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* is used for a local stack array size
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*/
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# define OSSL_HPKE_MAX_NONCELEN 12
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/*
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* @brief info about a KEM
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* Used to store constants from Section 7.1 "Table 2 KEM IDs"
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* and the bitmask for EC curves described in Section 7.1.3 DeriveKeyPair
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*/
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typedef struct {
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uint16_t kem_id; /* code point for key encipherment method */
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const char *keytype; /* string form of algtype "EC"/"X25519"/"X448" */
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const char *groupname; /* string form of EC group for NIST curves */
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const char *mdname; /* hash alg name for the HKDF */
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size_t Nsecret; /* size of secrets */
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size_t Nenc; /* length of encapsulated key */
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size_t Npk; /* length of public key */
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size_t Nsk; /* length of raw private key */
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uint8_t bitmask;
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} OSSL_HPKE_KEM_INFO;
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/*
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* @brief info about a KDF
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*/
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typedef struct {
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uint16_t kdf_id; /* code point for KDF */
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const char *mdname; /* hash alg name for the HKDF */
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size_t Nh; /* length of hash/extract output */
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} OSSL_HPKE_KDF_INFO;
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/*
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* @brief info about an AEAD
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*/
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typedef struct {
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uint16_t aead_id; /* code point for aead alg */
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const char *name; /* alg name */
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size_t taglen; /* aead tag len */
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size_t Nk; /* size of a key for this aead */
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size_t Nn; /* length of a nonce for this aead */
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} OSSL_HPKE_AEAD_INFO;
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const OSSL_HPKE_KEM_INFO *ossl_HPKE_KEM_INFO_find_curve(const char *curve);
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const OSSL_HPKE_KEM_INFO *ossl_HPKE_KEM_INFO_find_id(uint16_t kemid);
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const OSSL_HPKE_KEM_INFO *ossl_HPKE_KEM_INFO_find_random(OSSL_LIB_CTX *ctx);
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const OSSL_HPKE_KDF_INFO *ossl_HPKE_KDF_INFO_find_id(uint16_t kdfid);
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const OSSL_HPKE_KDF_INFO *ossl_HPKE_KDF_INFO_find_random(OSSL_LIB_CTX *ctx);
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const OSSL_HPKE_AEAD_INFO *ossl_HPKE_AEAD_INFO_find_id(uint16_t aeadid);
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const OSSL_HPKE_AEAD_INFO *ossl_HPKE_AEAD_INFO_find_random(OSSL_LIB_CTX *ctx);
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int ossl_hpke_kdf_extract(EVP_KDF_CTX *kctx,
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unsigned char *prk, size_t prklen,
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const unsigned char *salt, size_t saltlen,
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const unsigned char *ikm, size_t ikmlen);
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int ossl_hpke_kdf_expand(EVP_KDF_CTX *kctx,
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unsigned char *okm, size_t okmlen,
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const unsigned char *prk, size_t prklen,
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const unsigned char *info, size_t infolen);
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int ossl_hpke_labeled_extract(EVP_KDF_CTX *kctx,
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unsigned char *prk, size_t prklen,
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const unsigned char *salt, size_t saltlen,
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const char *protocol_label,
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const unsigned char *suiteid, size_t suiteidlen,
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const char *label,
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const unsigned char *ikm, size_t ikmlen);
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int ossl_hpke_labeled_expand(EVP_KDF_CTX *kctx,
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unsigned char *okm, size_t okmlen,
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const unsigned char *prk, size_t prklen,
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const char *protocol_label,
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const unsigned char *suiteid, size_t suiteidlen,
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const char *label,
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const unsigned char *info, size_t infolen);
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EVP_KDF_CTX *ossl_kdf_ctx_create(const char *kdfname, const char *mdname,
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OSSL_LIB_CTX *libctx, const char *propq);
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int ossl_hpke_str2suite(const char *suitestr, OSSL_HPKE_SUITE *suite);
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#endif
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