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clarify counter value

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This commit is contained in:
Peter Rounce 2023-09-16 15:26:22 +01:00
parent ae967cc011
commit 46a83398b4
3 changed files with 11 additions and 6 deletions
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1
.gitignore vendored
View file

@ -7,6 +7,7 @@
boltcard boltcard
createboltcard/createboltcard createboltcard/createboltcard
wipeboltcard/wipeboltcard wipeboltcard/wipeboltcard
cli/cli
# Test binary, built with `go test -c` # Test binary, built with `go test -c`
*.test *.test

10
cli/main.go
View file

@ -25,9 +25,9 @@ func check_cmac(uid []byte, ctr []byte, k2_cmac_key []byte, cmac []byte) (bool,
sv2[10] = uid[4] sv2[10] = uid[4]
sv2[11] = uid[5] sv2[11] = uid[5]
sv2[12] = uid[6] sv2[12] = uid[6]
sv2[13] = ctr[0] sv2[13] = ctr[2]
sv2[14] = ctr[1] sv2[14] = ctr[1]
sv2[15] = ctr[2] sv2[15] = ctr[0]
cmac_verified, err := crypto.Aes_cmac(k2_cmac_key, sv2, cmac) cmac_verified, err := crypto.Aes_cmac(k2_cmac_key, sv2, cmac)
@ -108,7 +108,11 @@ func main() {
} }
uid := dec_p[1:8] uid := dec_p[1:8]
ctr := dec_p[8:11]
ctr := make([]byte, 3)
ctr[0] = dec_p[10]
ctr[1] = dec_p[9]
ctr[2] = dec_p[8]
// set up uid & ctr for card record if needed // set up uid & ctr for card record if needed

6
docs/TEST_VECTORS.md
View file

@ -10,7 +10,7 @@ c = E19CCB1FED8892CE
aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d
aes_cmac_key = b45775776cb224c75bcde7ca3704e933 aes_cmac_key = b45775776cb224c75bcde7ca3704e933
decrypted card data : uid 04996c6a926980 , ctr 030000 decrypted card data : uid 04996c6a926980 , ctr 000003
cmac validates ok cmac validates ok
@ -22,7 +22,7 @@ c = 66B4826EA4C155B4
aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d
aes_cmac_key = b45775776cb224c75bcde7ca3704e933 aes_cmac_key = b45775776cb224c75bcde7ca3704e933
decrypted card data : uid 04996c6a926980 , ctr 050000 decrypted card data : uid 04996c6a926980 , ctr 000005
cmac validates ok cmac validates ok
@ -34,7 +34,7 @@ c = CC61660C020B4D96
aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d aes_decrypt_key = 0c3b25d92b38ae443229dd59ad34b85d
aes_cmac_key = b45775776cb224c75bcde7ca3704e933 aes_cmac_key = b45775776cb224c75bcde7ca3704e933
decrypted card data : uid 04996c6a926980 , ctr 070000 decrypted card data : uid 04996c6a926980 , ctr 000007
cmac validates ok cmac validates ok
``` ```