80 lines
2.1 KiB
C
80 lines
2.1 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 HEAP_HINT NULL
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int main(void)
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{
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int ret;
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size_t bytes;
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RsaKey key;
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word32 idx = 0;
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const word32 plainSz = RSA_TEST_BYTES;
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byte tmp[sizeof_client_keypub_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(&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_keypub_der_2048;
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/* Copy in existing Public RSA key into "tmp" to use for decrypting */
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XMEMCPY(tmp, client_keypub_der_2048, (size_t)sizeof_client_keypub_der_2048);
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/* Initialize the RSA key structure */
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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 public key from buffer "tmp" into RsaKey stucture "key" */
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ret = wc_RsaPublicKeyDecode(tmp, &idx, &key, (word32)bytes);
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check_ret(ret, "wc_RsaPrivateKeyDecode");
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fStream = fopen(fName, "rb");
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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) fread(out, 1, RSA_TEST_BYTES, fStream);
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check_ret(ret, "fread the rsa key to file");
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fclose(fStream);
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idx = (word32)ret; /* number of bytes read in from the file */
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XMEMSET(plain, 0, plainSz);
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ret = wc_RsaSSL_Verify(out, idx, plain, plainSz, &key);
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check_ret(ret, "wc_RsaSSL_Verify");
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printf("Here is the recovered AES KEY!\n%s\n", plain);
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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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