Hi, Consider the following 2 invocations from kcapi and the results we get from it. They are not matching with the NIST vectors [links pasted below]. Could somebody please tell why that could be happening? thanks JItendra https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/mac/gcmtestvectors.zip /gcmtestvectors/gcmEncryptExtIV192.rsp TEST 1: GCM [Keylen = 192] [IVlen = 8 bits] [PTlen = 128] [AADlen = 0] [Taglen = 128] NIST vector: Key = d4ba70cb3e8d246aa66ebfafd26266b5f08ec3a88000e770 IV = 13 PT = 0616236190652619ff51ad2775f2826e AAD = CT = 52b5f106a01d1cef4c833099ce88a354 Tag = d8acd529c97efbefb6102a4a9c3dafb2 attempt1: jlulla@ubuntu:~/libkcapi-1.0.3/bin$ ./kcapi -x 2 -e -c "gcm(aes)" -p 0616236190652619ff51ad2775f2826e -k d4ba70cb3e8d246aa66ebfafd26266b5f08ec3a88000e770 -i 13 -l 16 172e34500211d494ec35171aa488a26e65bc6a61759a974751875ab6fe27caed attempt2: jlulla@ubuntu:~/libkcapi-1.0.3/bin$ ./kcapi -x 2 -e -c "gcm(aes)" -p 0616236190652619ff51ad2775f2826e -k d4ba70cb3e8d246aa66ebfafd26266b5f08ec3a88000e770 -i 13 -a "" -l 16 172e34500211d494ec35171aa488a26e65bc6a61759a974751875ab6fe27caed attempt3: jlulla@ubuntu:~/libkcapi-1.0.3/bin$ ./kcapi -x 2 -e -c "gcm(aes)" -p 0616236190652619ff51ad2775f2826e -k d4ba70cb3e8d246aa66ebfafd26266b5f08ec3a88000e770 -i 13 -a 0 -l 16 172e34500211d494ec35171aa488a26e65bc6a61759a974751875ab6fe27caed SO the tag and the ct both not matching in all 3 attempts above. TEST 2: Similarly for XTS also we have one mismatch: https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/aes/XTSTestVectors.zip /XTSTestVectors/format tweak value input - 128 hex str/XTSGenAES256.rsp kcapi -x 1 -e -c "xts(aes)" -k 31c8152b5eddc3b8c3a005a3bbc4c005bb57058ae4a6454c166a620389eaecaea0515433574b0dd6a89496acd475ef78dcf012a47a48c319f89e931404018e15 -p 31761b6dece3e962030c01f481c5ca681386176d2ef8034c5db5aa04b613ec00 -i 6957d297dc9c9b30f6d016b016d913c5 Result from tool : 1e16b5a44274f8791508cf3dec971aa975e16c702d66f11bc1f00ede540ef82c NIST Expected Result : ae13222810bc66997bf8b57737990e481e16b5a44274f8791508cf3dec971a80
