73 lines
2.6 KiB
Text
73 lines
2.6 KiB
Text
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# Notes on the wolfssl-fips project
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First, if you did not get the FIPS files with your archive, you must contact
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wolfSSL to obtain them.
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The IDE/WIN/wolfssl-fips.sln solution is for the original FIPS #2425 certificate.
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See IDE/WIN10/wolfssl-fips.sln for the FIPS v2 #3389 or later Visual Studio solution.
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# Building the wolfssl-fips project
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The wolfCrypt FIPS library for Windows is a part of the wolfSSL library. It
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must be built as a static library, for the moment.
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The library project is built with Whole Program Optimization disabled. This is
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required so that necessary components of the library are not optimized away.
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There are two functions added to the library that are used as markers in
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memory for the in-core memory check of the code. WPO consolidates them into a
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single function. WPO also optimizes away the automatic FIPS entry function.
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Each of the source files inside the FIPS boundary defines their own code and
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constant section. The code section names start with ".fipsA$" and the constant
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section names start with ".fipsB$". Each subsection has a letter to organize
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them in a specific order. This specific ordering puts marker functions and
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constants on either end of the boundary so it can be hashed.
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# In Core Memory Test
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The In Core Memory test calculates a checksum (HMAC-SHA256) of the wolfCrypt
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FIPS library code and constant data and compares it with a known value in
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the code.
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The Randomized Base Address setting needs to be disabled on the 32-bit builds
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but can be enabled on the 64-bit builds. In the 32-bit mode the addresses
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being different throws off the in-core memory calculation. It looks like in
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64-bit mode the library uses all offsets, so the core hash calculation
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is the same every time.
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The "verifyCore" check value in the source fips_test.c needs to be updated when
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building the code. The POS performs this check and the default failure callback
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will print out the calculated checksum. When developing your code, copy this
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value and paste it back into your code in the verifyCore initializer then
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rebuild the code. When statically linking, you may have to recalculate your
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check value when changing your application.
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# Build Options
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The default build options should be the proper default set of options:
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* HAVE_FIPS
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* HAVE_THREAD_LS
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* HAVE_AESGCM
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* HAVE_HASHDRBG
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* WOLFSSL_SHA384
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* WOLFSSL_SHA512
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* NO_HC128
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* NO_RC4
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* NO_RABBIT
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* NO_DSA
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* NO_MD4
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The "NO" options explicitly disable algorithms that are not allowed in
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FIPS mode.
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Additionally one may enable:
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* HAVE_ECC
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* OPENSSL_EXTRA
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* WOLFSSL_KEY_GEN
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These settings are defined in IDE/WIN/user_settings.h.
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