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Merge pull request #10993 from saadgodikat/backport-10973-4.1

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[4.1] Fix DER certificate output on Windows
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Manuel Pégourié-Gonnard 2026-10-06 10:13:44 +00:00 committed by GitHub
commit 14501f4503
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2 changed files with 8 additions and 1 deletions
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ChangeLog.d/cert-write-der-windows.txt Normal file
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@ -0,0 +1,3 @@
Bugfix
* Fix corruption of DER certificates generated by the `cert_write`
sample program on Windows. #10152

6
programs/x509/cert_write.c
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@ -238,7 +238,11 @@ static int write_certificate(mbedtls_x509write_cert *crt, const char *output_fil
output_start = output_buf;
}
if ((f = fopen(output_file, "w")) == NULL) {
/*
* DER output is binary data. Use binary mode on Windows to prevent
* text-mode newline translation.
*/
if ((f = fopen(output_file, opt.format == FORMAT_DER ? "wb" : "w")) == NULL) {
return -1;
}