crypto.h

#pragma once
 
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/ecdsa.h"
 
#define CURVE MBEDTLS_ECP_DP_SECP256K1
 
/* KEY GENERATION */
 
void init_entropy();
 
void free_entropy();
 
mbedtls_ecdsa_context *gen_keys();
 
/* SIGNATURE HANDLING */
 
size_t write_sig(
    unsigned char *dest, size_t dest_len,
    unsigned char *hash, size_t hash_len,
    mbedtls_ecdsa_context *keys
);
 
int validate_sig(
    unsigned char *sig, size_t sig_len,
    unsigned char *hash, size_t hash_len,
    mbedtls_ecdsa_context *key_pair
);
 
void build_ctx_from_public(mbedtls_ecdsa_context *ctx, mbedtls_ecp_point *pub_key);
 
/* HASHING */
 
int hash_sha256(unsigned char *output_hash, unsigned char *input_data, size_t input_sz); 
 
void hash_pub_key(unsigned char *dest, mbedtls_ecdsa_context *key_pair);
 
 
/* MISC */
 
void dump_buf(char *prefix, const char *title, const unsigned char *buf, size_t len);
 
/* GLOBALS */
 
extern char *seed;
extern mbedtls_entropy_context *entropy;
extern mbedtls_ctr_drbg_context *ctr_drbg;