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sh
25 lines
717 B
C
25 lines
717 B
C
// SPDX-License-Identifier: Apache-2.0
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// getentropy() shim for Windows, where it is absent from the CRT.
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// Follows the POSIX contract: fills `buffer` with `length` random bytes
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// (length must not exceed 256), returns 0 on success or -1 with errno set.
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#ifdef _WIN32
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#include <errno.h>
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#include <stddef.h>
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#include <windows.h>
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#include <bcrypt.h>
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int getentropy(void *buffer, size_t length) {
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if (length > 256) {
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errno = EIO;
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return -1;
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}
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NTSTATUS status = BCryptGenRandom(NULL, (PUCHAR)buffer, (ULONG)length,
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BCRYPT_USE_SYSTEM_PREFERRED_RNG);
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if (!BCRYPT_SUCCESS(status)) {
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errno = EIO;
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return -1;
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}
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return 0;
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}
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#endif
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