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Merge pull request #81884 from Faless/crypto/random_in_chunks

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[Crypto] Fix `generate_random_bytes` for large chunks
This commit is contained in:
Rémi Verschelde 2023-09-25 22:47:50 +02:00
commit 3514053fee
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1 changed files with 11 additions and 1 deletions
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12
modules/mbedtls/crypto_mbedtls.cpp
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@ -419,9 +419,19 @@ Ref<X509Certificate> CryptoMbedTLS::generate_self_signed_certificate(Ref<CryptoK
}
PackedByteArray CryptoMbedTLS::generate_random_bytes(int p_bytes) {
ERR_FAIL_COND_V(p_bytes < 0, PackedByteArray());
PackedByteArray out;
out.resize(p_bytes);
mbedtls_ctr_drbg_random(&ctr_drbg, out.ptrw(), p_bytes);
int left = p_bytes;
int pos = 0;
// Ensure we generate random in chunks of no more than MBEDTLS_CTR_DRBG_MAX_REQUEST bytes or mbedtls_ctr_drbg_random will fail.
while (left > 0) {
int to_read = MIN(left, MBEDTLS_CTR_DRBG_MAX_REQUEST);
int ret = mbedtls_ctr_drbg_random(&ctr_drbg, out.ptrw() + pos, to_read);
ERR_FAIL_COND_V_MSG(ret != 0, PackedByteArray(), vformat("Failed to generate %d random bytes(s). Error: %d.", p_bytes, ret));
left -= to_read;
pos += to_read;
}
return out;
}