97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wolfssl/options.h>
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#include <wolfssl/wolfcrypt/rsa.h>
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#include <wolfssl/ssl.h>
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/* certs_test.h contains der formatted key buffer rsa_key_der_2048 */
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#ifdef USE_CERT_BUFFERS_2048
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#include <wolfssl/certs_test.h>
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#else
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#error "Please define USE_CERT_BUFFERS_2048 when building wolfSSL!"
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#endif
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void check_ret(int val, char* fail);
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#define RSA_TEST_BYTES 256 /* 256 bytes * 8 = 2048-bit key length */
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#define AES_KEY_SZ 32 /* 32*8 = 256-bit AES KEY */
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#define HEAP_HINT NULL
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int main(void)
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{
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int ret;
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byte* der = NULL;
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byte* pem = NULL;
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size_t bytes;
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WC_RNG rng;
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RsaKey key;
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word32 idx = 0;
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byte* res;
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const word32 outSz = RSA_TEST_BYTES;
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const word32 plainSz = RSA_TEST_BYTES;
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const byte in[] = "Thisismyfakeaeskeythatis32bytes!";
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word32 inLen = XSTRLEN((const char*)in);
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byte tmp[sizeof_client_key_der_2048];
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byte out[RSA_TEST_BYTES];
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byte plain[RSA_TEST_BYTES];
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char fName[] = "encryptedAesKey";
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FILE* fStream;
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/* initialize stack structures */
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XMEMSET(&rng, 0, sizeof(rng));
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XMEMSET(&key, 0, sizeof(key));
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XMEMSET(&out, 0, sizeof(out));
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XMEMSET(&plain, 0, sizeof(plain));
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bytes = (size_t)sizeof_client_key_der_2048;
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/* Copy in existing Private RSA key into "tmp" to use for encrypting */
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XMEMCPY(tmp, client_key_der_2048, (size_t)sizeof_client_key_der_2048);
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/* Initialize the RSA key */
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ret = wc_InitRsaKey(&key, HEAP_HINT);
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check_ret(ret, "wc_InitRsaKey_ex");
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/* Decode the private key from buffer "tmp" into RsaKey stucture "key" */
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ret = wc_RsaPrivateKeyDecode(tmp, &idx, &key, (word32)bytes);
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check_ret(ret, "wc_RsaPrivateKeyDecode");
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/* Initialize the RNG structure */
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ret = wc_InitRng(&rng);
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check_ret(ret, "wc_InitRng");
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/* Implement RSA blinding to defeat side-channel attacks */
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#ifdef WC_RSA_BLINDING /* HIGHLY RECOMMENDED! */
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ret = wc_RsaSetRNG(&key, &rng);
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check_ret(ret, "wc_RsaSetRNG");
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#endif
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/* Sign the AES key effectively "Encrypting it with the private key" */
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ret = wc_RsaSSL_Sign(in, inLen, out, outSz, &key, &rng);
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check_ret(ret, "wc_RsaSSL_Sign");
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/* Output to file */
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fStream = fopen(fName, "wb");
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if (!fStream) {
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printf("Failed to open file: %s\n", fName);
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return -99;
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}
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ret = (int) fwrite(out, 1, RSA_TEST_BYTES, fStream);
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check_ret(ret, "fwrite the rsa key to file");
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fclose(fStream);
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return ret;
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}
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void check_ret(int val, char* fail)
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{
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if (val < 0) {
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printf("%s Failed with error %d\n", fail, val);
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exit(-99);
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}
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return;
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}
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