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-rw-r--r--lib/crypto/test/crypto_SUITE.erl17
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/crypto/test/crypto_SUITE.erl b/lib/crypto/test/crypto_SUITE.erl
index 627c966dfb..196f00da5d 100644
--- a/lib/crypto/test/crypto_SUITE.erl
+++ b/lib/crypto/test/crypto_SUITE.erl
@@ -717,10 +717,19 @@ aes_cfb(Config) when is_list(Config) ->
?line Key = hexstr2bin("2b7e151628aed2a6abf7158809cf4f3c"),
?line IVec = hexstr2bin("000102030405060708090a0b0c0d0e0f"),
?line Plain = hexstr2bin("6bc1bee22e409f96e93d7e117393172a"),
- ?line Cipher = crypto:aes_cfb_128_encrypt(Key, IVec, Plain),
- ?line m(Cipher, hexstr2bin("3b3fd92eb72dad20333449f8e83cfb4a")),
- ?line m(Plain,
- crypto:aes_cfb_128_decrypt(Key, IVec, Cipher)).
+ ?line Cipher = hexstr2bin("3b3fd92eb72dad20333449f8e83cfb4a"),
+
+ %% Try all prefixes of plain and cipher.
+ aes_cfb_do(byte_size(Plain), Plain, Cipher, Key, IVec).
+
+aes_cfb_do(N, Plain, Cipher, Key, IVec) when N >= 0 ->
+ <<P:N/binary, _/binary>> = Plain,
+ <<C:N/binary, _/binary>> = Cipher,
+ ?line C = crypto:aes_cfb_128_encrypt(Key, IVec, P),
+ ?line P = crypto:aes_cfb_128_decrypt(Key, IVec, C),
+ aes_cfb_do(N-1, Plain, Cipher, Key, IVec);
+aes_cfb_do(_, _, _, _, _) -> ok.
+
%%
%%