Sandboxie/SandboxieTools/ImBox/dc/crypto_fast/sha512_hmac_drbg.h

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2023-08-24 17:39:00 +01:00
#ifndef _SHA512_HMAC_DRBG_H_
#define _SHA512_HMAC_DRBG_H_
#include "sha512.h"
#include "sha512_hmac.h"
/* The minimum required entropy interval for instantiate and reseed is security_strength bits.
according NIST SP 800-90 Section 10.1 Table 2
*/
#define SHA512_HMAC_DRBG_MIN_ENTROPY_BYTES ( 256 / 8 )
/* The maximum entropy input length for HMAC_DRBG is 2^35 bits
according NIST SP 800-90 Section 10.1 Table 2
*/
#define SHA512_HMAC_DRBG_MAX_ENTROPY_BYTES ( (1ull << 35) / 8 )
/* The maximum permitted personalisation string length for HMAC_DRBG is 2^35 bits
according NIST SP 800-90 Section 10.1 Table 2
*/
#define SHA512_HMAC_DRBG_MAX_PERSONAL_BYTES ( (1ull << 35) / 8 )
/* The maximum permitted additional input length for HMAC_DRBG is 2^35 bits
according NIST SP 800-90 Section 10.1 Table 2
*/
#define SHA512_HMAC_DRBG_MAX_ADDITIONAL_BYTES ( (1ull << 35) / 8 )
/* The maximum number of bits per request for HMAC_DRBG is 2^19 bits
according NIST SP 800-90 Section 10.1 Table 2
*/
#define SHA512_HMAC_DRBG_MAX_GENERATED_BYTES ( (1 << 19) / 8 )
/* The maximum permitted reseed interval for HMAC_DRBG is 2^48,
We choose a very conservative reseed interval.
*/
#define SHA512_HMAC_DRBG_RESEED_INTERVAL 128
typedef struct _sha512_hmac_drbg_ctx {
// The outlen-bit Key, which is updated at least once each time that the DRBG mechanism generates pseudorandom bits.
unsigned char key[SHA512_DIGEST_SIZE];
// The value V of outlen bits, which is updated each time another outlen bits of output are produced.
unsigned char val[SHA512_DIGEST_SIZE];
// A counter that indicates the number of generation requests since instantiation or reseeding.
unsigned long reseed_counter;
} sha512_hmac_drbg_ctx;
int _stdcall sha512_hmac_drbg_instantiate( sha512_hmac_drbg_ctx *ctx, const void *entropy, size_t entropy_len,
const void *personal, size_t personal_len );
int _stdcall sha512_hmac_drbg_reseed( sha512_hmac_drbg_ctx *ctx, const void *entropy, size_t entropy_len,
const void *additional, size_t additional_len );
int _stdcall sha512_hmac_drbg_generate( sha512_hmac_drbg_ctx *ctx, const void *additional, size_t additional_len,
unsigned char *output, size_t output_len );
#endif