mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-27 21:54:15 +01:00
312 lines
11 KiB
C
312 lines
11 KiB
C
/* srp.h
|
||
*
|
||
* Copyright (C) 2006-2019 wolfSSL Inc.
|
||
*
|
||
* This file is part of wolfSSL.
|
||
*
|
||
* wolfSSL is free software; you can redistribute it and/or modify
|
||
* it under the terms of the GNU General Public License as published by
|
||
* the Free Software Foundation; either version 2 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* wolfSSL is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
* GNU General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with this program; if not, write to the Free Software
|
||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
|
||
*/
|
||
|
||
/*!
|
||
\file wolfssl/wolfcrypt/srp.h
|
||
*/
|
||
|
||
#ifdef WOLFCRYPT_HAVE_SRP
|
||
|
||
#ifndef WOLFCRYPT_SRP_H
|
||
#define WOLFCRYPT_SRP_H
|
||
|
||
#include <libwolfssl/wolfcrypt/types.h>
|
||
#include <libwolfssl/wolfcrypt/sha.h>
|
||
#include <libwolfssl/wolfcrypt/sha256.h>
|
||
#include <libwolfssl/wolfcrypt/sha512.h>
|
||
#include <libwolfssl/wolfcrypt/integer.h>
|
||
|
||
#ifdef __cplusplus
|
||
extern "C" {
|
||
#endif
|
||
|
||
/* Select the largest available hash for the buffer size. */
|
||
#if defined(WOLFSSL_SHA512)
|
||
#define SRP_MAX_DIGEST_SIZE WC_SHA512_DIGEST_SIZE
|
||
#elif defined(WOLFSSL_SHA384)
|
||
#define SRP_MAX_DIGEST_SIZE WC_SHA384_DIGEST_SIZE
|
||
#elif !defined(NO_SHA256)
|
||
#define SRP_MAX_DIGEST_SIZE WC_SHA256_DIGEST_SIZE
|
||
#elif !defined(NO_SHA)
|
||
#define SRP_MAX_DIGEST_SIZE WC_SHA_DIGEST_SIZE
|
||
#else
|
||
#error "You have to have some kind of SHA hash if you want to use SRP."
|
||
#endif
|
||
|
||
/* Set the minimum number of bits acceptable in an SRP modulus */
|
||
#define SRP_MODULUS_MIN_BITS 512
|
||
|
||
/* Set the minimum number of bits acceptable for private keys (RFC 5054) */
|
||
#define SRP_PRIVATE_KEY_MIN_BITS 256
|
||
|
||
/* salt size for SRP password */
|
||
#define SRP_SALT_SIZE 16
|
||
|
||
/**
|
||
* SRP side, client or server.
|
||
*/
|
||
typedef enum {
|
||
SRP_CLIENT_SIDE = 0,
|
||
SRP_SERVER_SIDE = 1,
|
||
} SrpSide;
|
||
|
||
/**
|
||
* SRP hash type, SHA[1|256|384|512].
|
||
*/
|
||
typedef enum {
|
||
SRP_TYPE_SHA = 1,
|
||
SRP_TYPE_SHA256 = 2,
|
||
SRP_TYPE_SHA384 = 3,
|
||
SRP_TYPE_SHA512 = 4,
|
||
} SrpType;
|
||
|
||
|
||
/**
|
||
* SRP hash struct.
|
||
*/
|
||
typedef struct {
|
||
byte type;
|
||
union {
|
||
#ifndef NO_SHA
|
||
wc_Sha sha;
|
||
#endif
|
||
#ifndef NO_SHA256
|
||
wc_Sha256 sha256;
|
||
#endif
|
||
#ifdef WOLFSSL_SHA384
|
||
wc_Sha384 sha384;
|
||
#endif
|
||
#ifdef WOLFSSL_SHA512
|
||
wc_Sha512 sha512;
|
||
#endif
|
||
} data;
|
||
} SrpHash;
|
||
|
||
typedef struct Srp {
|
||
SrpSide side; /**< Client or Server, @see SrpSide. */
|
||
SrpType type; /**< Hash type, @see SrpType. */
|
||
byte* user; /**< Username, login. */
|
||
word32 userSz; /**< Username length. */
|
||
byte* salt; /**< Small salt. */
|
||
word32 saltSz; /**< Salt length. */
|
||
mp_int N; /**< Modulus. N = 2q+1, [q, N] are primes.*/
|
||
mp_int g; /**< Generator. A generator modulo N. */
|
||
byte k[SRP_MAX_DIGEST_SIZE]; /**< Multiplier parameter. k = H(N, g) */
|
||
mp_int auth; /**< Client: x = H(salt + H(user:pswd)) */
|
||
/**< Server: v = g ^ x % N */
|
||
mp_int priv; /**< Private ephemeral value. */
|
||
SrpHash client_proof; /**< Client proof. Sent to the Server. */
|
||
SrpHash server_proof; /**< Server proof. Sent to the Client. */
|
||
byte* key; /**< Session key. */
|
||
word32 keySz; /**< Session key length. */
|
||
int (*keyGenFunc_cb) (struct Srp* srp, byte* secret, word32 size);
|
||
/**< Function responsible for generating the session key. */
|
||
/**< It MUST use XMALLOC with type DYNAMIC_TYPE_SRP to allocate the */
|
||
/**< key buffer for this structure and set keySz to the buffer size. */
|
||
/**< The default function used by this implementation is a modified */
|
||
/**< version of t_mgf1 that uses the proper hash function according */
|
||
/**< to srp->type. */
|
||
void* heap; /**< heap hint pointer */
|
||
} Srp;
|
||
|
||
/**
|
||
* Initializes the Srp struct for usage.
|
||
*
|
||
* @param[out] srp the Srp structure to be initialized.
|
||
* @param[in] type the hash type to be used.
|
||
* @param[in] side the side of the communication.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpInit(Srp* srp, SrpType type, SrpSide side);
|
||
|
||
/**
|
||
* Releases the Srp struct resources after usage.
|
||
*
|
||
* @param[in,out] srp the Srp structure to be terminated.
|
||
*/
|
||
WOLFSSL_API void wc_SrpTerm(Srp* srp);
|
||
|
||
/**
|
||
* Sets the username.
|
||
*
|
||
* This function MUST be called after wc_SrpInit.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] username the buffer containing the username.
|
||
* @param[in] size the username size in bytes
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpSetUsername(Srp* srp, const byte* username, word32 size);
|
||
|
||
|
||
/**
|
||
* Sets the srp parameters based on the username.
|
||
*
|
||
* This function MUST be called after wc_SrpSetUsername.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] N the Modulus. N = 2q+1, [q, N] are primes.
|
||
* @param[in] nSz the N size in bytes.
|
||
* @param[in] g the Generator modulo N.
|
||
* @param[in] gSz the g size in bytes
|
||
* @param[in] salt a small random salt. Specific for each username.
|
||
* @param[in] saltSz the salt size in bytes
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpSetParams(Srp* srp, const byte* N, word32 nSz,
|
||
const byte* g, word32 gSz,
|
||
const byte* salt, word32 saltSz);
|
||
|
||
/**
|
||
* Sets the password.
|
||
*
|
||
* Setting the password does not persists the clear password data in the
|
||
* srp structure. The client calculates x = H(salt + H(user:pswd)) and stores
|
||
* it in the auth field.
|
||
*
|
||
* This function MUST be called after wc_SrpSetParams and is CLIENT SIDE ONLY.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] password the buffer containing the password.
|
||
* @param[in] size the password size in bytes.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpSetPassword(Srp* srp, const byte* password, word32 size);
|
||
|
||
/**
|
||
* Sets the verifier.
|
||
*
|
||
* This function MUST be called after wc_SrpSetParams and is SERVER SIDE ONLY.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] verifier the buffer containing the verifier.
|
||
* @param[in] size the verifier size in bytes.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpSetVerifier(Srp* srp, const byte* verifier, word32 size);
|
||
|
||
/**
|
||
* Gets the verifier.
|
||
*
|
||
* The client calculates the verifier with v = g ^ x % N.
|
||
* This function MAY be called after wc_SrpSetPassword and is CLIENT SIDE ONLY.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[out] verifier the buffer to write the verifier.
|
||
* @param[in,out] size the buffer size in bytes. Will be updated with the
|
||
* verifier size.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpGetVerifier(Srp* srp, byte* verifier, word32* size);
|
||
|
||
/**
|
||
* Sets the private ephemeral value.
|
||
*
|
||
* The private ephemeral value is known as:
|
||
* a at the client side. a = random()
|
||
* b at the server side. b = random()
|
||
* This function is handy for unit test cases or if the developer wants to use
|
||
* an external random source to set the ephemeral value.
|
||
* This function MAY be called before wc_SrpGetPublic.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] priv the ephemeral value.
|
||
* @param[in] size the private size in bytes.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpSetPrivate(Srp* srp, const byte* priv, word32 size);
|
||
|
||
/**
|
||
* Gets the public ephemeral value.
|
||
*
|
||
* The public ephemeral value is known as:
|
||
* A at the client side. A = g ^ a % N
|
||
* B at the server side. B = (k * v + (g ˆ b % N)) % N
|
||
* This function MUST be called after wc_SrpSetPassword or wc_SrpSetVerifier.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[out] pub the buffer to write the public ephemeral value.
|
||
* @param[in,out] size the the buffer size in bytes. Will be updated with
|
||
* the ephemeral value size.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpGetPublic(Srp* srp, byte* pub, word32* size);
|
||
|
||
|
||
/**
|
||
* Computes the session key.
|
||
*
|
||
* The key can be accessed at srp->key after success.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] clientPubKey the client's public ephemeral value.
|
||
* @param[in] clientPubKeySz the client's public ephemeral value size.
|
||
* @param[in] serverPubKey the server's public ephemeral value.
|
||
* @param[in] serverPubKeySz the server's public ephemeral value size.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpComputeKey(Srp* srp,
|
||
byte* clientPubKey, word32 clientPubKeySz,
|
||
byte* serverPubKey, word32 serverPubKeySz);
|
||
|
||
/**
|
||
* Gets the proof.
|
||
*
|
||
* This function MUST be called after wc_SrpComputeKey.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[out] proof the buffer to write the proof.
|
||
* @param[in,out] size the buffer size in bytes. Will be updated with the
|
||
* proof size.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpGetProof(Srp* srp, byte* proof, word32* size);
|
||
|
||
/**
|
||
* Verifies the peers proof.
|
||
*
|
||
* This function MUST be called before wc_SrpGetSessionKey.
|
||
*
|
||
* @param[in,out] srp the Srp structure.
|
||
* @param[in] proof the peers proof.
|
||
* @param[in] size the proof size in bytes.
|
||
*
|
||
* @return 0 on success, {@literal <} 0 on error. @see error-crypt.h
|
||
*/
|
||
WOLFSSL_API int wc_SrpVerifyPeersProof(Srp* srp, byte* proof, word32 size);
|
||
|
||
#ifdef __cplusplus
|
||
} /* extern "C" */
|
||
#endif
|
||
|
||
#endif /* WOLFCRYPT_SRP_H */
|
||
#endif /* WOLFCRYPT_HAVE_SRP */
|