From 282c14852d00d6d1b8fadf3e01e4180f02ddda84 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 6 Dec 2018 13:00:08 -0800 Subject: crypto: xchacha20 - fix comments for test vectors The kernel's ChaCha20 uses the RFC7539 convention of the nonce being 12 bytes rather than 8, so actually I only appended 12 random bytes (not 16) to its test vectors to form 24-byte nonces for the XChaCha20 test vectors. The other 4 bytes were just from zero-padding the stream position to 8 bytes. Fix the comments above the test vectors. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- crypto/testmgr.h | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) (limited to 'crypto') diff --git a/crypto/testmgr.h b/crypto/testmgr.h index 357cf4cbcbb1..e8f47d7b92cd 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -32281,8 +32281,9 @@ static const struct cipher_testvec xchacha20_tv_template[] = { "\x57\x78\x8e\x6f\xae\x90\xfc\x31" "\x09\x7c\xfc", .len = 91, - }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes - to nonce, and recomputed the ciphertext with libsodium */ + }, { /* Taken from the ChaCha20 test vectors, appended 12 random bytes + to the nonce, zero-padded the stream position from 4 to 8 bytes, + and recomputed the ciphertext using libsodium's XChaCha20 */ .key = "\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00" @@ -32309,8 +32310,7 @@ static const struct cipher_testvec xchacha20_tv_template[] = { "\x03\xdc\xf8\x2b\xc1\xe1\x75\x67" "\x23\x7b\xe6\xfc\xd4\x03\x86\x54", .len = 64, - }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes - to nonce, and recomputed the ciphertext with libsodium */ + }, { /* Derived from a ChaCha20 test vector, via the process above */ .key = "\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00" @@ -32419,8 +32419,7 @@ static const struct cipher_testvec xchacha20_tv_template[] = { .np = 3, .tap = { 375 - 20, 4, 16 }, - }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes - to nonce, and recomputed the ciphertext with libsodium */ + }, { /* Derived from a ChaCha20 test vector, via the process above */ .key = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a" "\xf3\x33\x88\x86\x04\xf6\xb5\xf0" "\x47\x39\x17\xc1\x40\x2b\x80\x09" @@ -32463,8 +32462,7 @@ static const struct cipher_testvec xchacha20_tv_template[] = { "\x65\x03\xfa\x45\xf7\x9e\x53\x7a" "\x99\xf1\x82\x25\x4f\x8d\x07", .len = 127, - }, { /* Taken from the ChaCha20 test vectors, appended 16 random bytes - to nonce, and recomputed the ciphertext with libsodium */ + }, { /* Derived from a ChaCha20 test vector, via the process above */ .key = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a" "\xf3\x33\x88\x86\x04\xf6\xb5\xf0" "\x47\x39\x17\xc1\x40\x2b\x80\x09" -- cgit v1.2.3-59-g8ed1b