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Implement RSA encryption/decryption.

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This commit is contained in:
Fabio Alessandrelli
2020-06-06 16:09:28 +02:00
parent dfcc11fa52
commit 8e3f9aa681
4 changed files with 33 additions and 0 deletions
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27
modules/mbedtls/crypto_mbedtls.cpp
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@@ -362,3 +362,30 @@ bool CryptoMbedTLS::verify(HashingContext::HashType p_hash_type, Vector<uint8_t>
ERR_FAIL_COND_V_MSG(!key.is_valid(), false, "Invalid key provided.");
return mbedtls_pk_verify(&(key->pkey), type, p_hash.ptr(), size, p_signature.ptr(), p_signature.size()) == 0;
}
Vector<uint8_t> CryptoMbedTLS::encrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_plaintext) {
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
uint8_t buf[1024];
size_t size;
Vector<uint8_t> out;
int ret = mbedtls_pk_encrypt(&(key->pkey), p_plaintext.ptr(), p_plaintext.size(), buf, &size, sizeof(buf), mbedtls_ctr_drbg_random, &ctr_drbg);
ERR_FAIL_COND_V_MSG(ret, out, "Error while encrypting: " + itos(ret));
out.resize(size);
copymem(out.ptrw(), buf, size);
return out;
}
Vector<uint8_t> CryptoMbedTLS::decrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_ciphertext) {
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
ERR_FAIL_COND_V_MSG(key->is_public_only(), Vector<uint8_t>(), "Invalid key provided. Cannot decrypt using a public_only key.");
uint8_t buf[2048];
size_t size;
Vector<uint8_t> out;
int ret = mbedtls_pk_decrypt(&(key->pkey), p_ciphertext.ptr(), p_ciphertext.size(), buf, &size, sizeof(buf), mbedtls_ctr_drbg_random, &ctr_drbg);
ERR_FAIL_COND_V_MSG(ret, out, "Error while decrypting: " + itos(ret));
out.resize(size);
copymem(out.ptrw(), buf, size);
return out;
}