<html><head></head><body><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">@Andrew - Thanks for pointing that out. Indeed, that was the issue.<br>
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<div class="gmail_quote">On Fri, Aug 9, 2019 at 6:18 PM +0530, "Lynch, Andrew" <span dir="ltr"><<a href="mailto:andrew.lynch@atos.net" target="_blank">andrew.lynch@atos.net</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Your issue is not with BIO_read(), but with the differing signedness of the char type on your two platforms.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">On your PPC platform the char type defaults to unsigned, on your x86 platform it is signed. The %x format expects an unsigned int, so on x86 the
signed char values are being sign-extended to int which adds the ffffff to any values where the high bit is set (i.e. seen as negative).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">One possible fix: Change "char *ptr = buf;" to "unsigned char *ptr = buf;", then you should get the expected output.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Andrew.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> openssl-users [mailto:openssl-users-bounces@openssl.org]
<b>On Behalf Of </b>Venkata Veldanda via openssl-users<br>
<b>Sent:</b> Friday, August 09, 2019 11:20 AM<br>
<b>To:</b> openssl-users@openssl.org<br>
<b>Subject:</b> Does BIO_read() behave differently on diff architectures?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">Hi Experts,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">I am using openssl 1.0.2 <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">I recently moved my app from a PPC to x86 platform (application is compiled on the respective platform) where I met an issue with BIO_read(). <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">I read a 20bytes of data using BIO_read like following..<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">int res = BIO_read(bio, buf, 20);<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">char *ptr = buf;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">The content that I send as input is a signed file content that I get from a different source. The issue is that the output 'buf' is not as expected on my x86. The behavior is different
on different architectures. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">For e.g. on intel x86 platform I get the following output with additional 0xffffff padded.>> For me this is not the expected result. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">22,ffffff82,2b,28,06,09,2a,ffffff86,48,ffffff86,fffffff7,0d,02,09,02,ffffffa0,ffffff82,3b,12,30<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">This is what I was getting on my PPC platform which is as expected with the same app code.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">22,82,2b,28,06,09,2a,86,48,86,f7,0d,02,09,02,a0,82,3b,12,30<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">Ofcourse, I need to further check on the source where/how the signed file was generated, but does anyone have any idea if BIO_read() has any specific handling with repsect to architectures?.
I'd rule out the endianess factor as I would expect the entire byte order to be reversed if so. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">I print the above output using the following code. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif"">INFO( STR(" ..> Header@%02d: %02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x,"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""> "%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x",<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""> ptr-buf, *(ptr+0),*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""> *(ptr+5),*(ptr+6),*(ptr+7),*(ptr+8),*(ptr+9),<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""> *(ptr+10),*(ptr+11),*(ptr+12),*(ptr+13),*(ptr+14),<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""> *(ptr+15),*(ptr+16),*(ptr+17),*(ptr+18),*(ptr+19))); <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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