mirror of
https://github.com/DarkMatterCore/nxdumptool.git
synced 2024-11-23 02:36:41 +00:00
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <mbedtls/entropy.h>
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#include <mbedtls/ctr_drbg.h>
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#include <mbedtls/md.h>
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#include <mbedtls/rsa.h>
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#include <mbedtls/x509.h>
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#include "rsa.h"
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#include "rsa_keys.h"
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#include "ui.h"
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#include "util.h"
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/* Extern variables */
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extern int breaks;
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extern int font_height;
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bool rsa_sign(void* input, size_t input_size, unsigned char* output, size_t output_size)
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{
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unsigned char hash[32];
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
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const char *pers = "rsa_sign_pss";
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size_t olen = 0;
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int ret;
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bool success = false;
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mbedtls_pk_context pk;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_entropy_init(&entropy);
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mbedtls_pk_init(&pk);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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// Calculate SHA-256 checksum for the input data
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sha256CalculateHash(hash, input, input_size);
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// Seed the random number generator
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ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
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if (ret == 0)
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{
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// Parse private key
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ret = mbedtls_pk_parse_key(&pk, (unsigned char*)rsa_private_key, strlen(rsa_private_key) + 1, NULL, 0);
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if (ret == 0)
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{
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// Set RSA padding
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mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256);
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// Calculate hash signature
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ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0, buf, &olen, mbedtls_ctr_drbg_random, &ctr_drbg);
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if (ret == 0)
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{
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// Copy signature to output
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memcpy(output, buf, output_size);
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success = true;
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} else {
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uiDrawString(STRING_X_POS, STRING_Y_POS(breaks), FONT_COLOR_ERROR_RGB, "%s: mbedtls_pk_sign failed! (%d)", __func__, ret);
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}
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} else {
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uiDrawString(STRING_X_POS, STRING_Y_POS(breaks), FONT_COLOR_ERROR_RGB, "%s: mbedtls_pk_parse_key failed! (%d)", __func__, ret);
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}
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} else {
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uiDrawString(STRING_X_POS, STRING_Y_POS(breaks), FONT_COLOR_ERROR_RGB, "%s: mbedtls_ctr_drbg_seed failed! (%d)", __func__, ret);
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}
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_pk_free(&pk);
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mbedtls_entropy_free(&entropy);
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return success;
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}
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const unsigned char *rsa_get_public_key()
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{
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return rsa_public_key;
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}
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