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* cipher/cipher-poly1305.c (_gcry_cipher_poly1305_tag): Check that the
provided tag length matches the actual tag length.
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Signed-off-by: Werner Koch <wk@gnupg.org>
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* cipher/cipher-poly1305.c: copy a fixed length instead of the
user-supplied number.
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The outbuflen is used to check the minimum size, the real tag is always
of fixed length.
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
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* cipher/cipher-poly1305.c: Add RFC-7539 to header.
* doc/gcrypt.texi: Update Poly1305 AEAD documentation with mention of
RFC-7539; Drop Salsa from supported stream ciphers for Poly1305 AEAD.
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Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
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draft-irtf-cfrg-chacha20-poly1305-03
* cipher/cipher-internal.h (gcry_cipher_handle): Use separate byte
counters for AAD and data in Poly1305.
* cipher/cipher-poly1305.c (poly1305_fill_bytecount): Remove.
(poly1305_fill_bytecounts, poly1305_do_padding): New.
(poly1305_aad_finish): Fill padding to Poly1305 and do not fill AAD
length.
(_gcry_cipher_poly1305_authenticate, _gcry_cipher_poly1305_encrypt)
(_gcry_cipher_poly1305_decrypt): Update AAD and data length separately.
(_gcry_cipher_poly1305_tag): Fill padding and bytecounts to Poly1305.
(_gcry_cipher_poly1305_setkey, _gcry_cipher_poly1305_setiv): Reset
AAD and data byte counts; only allow 96-bit IV.
* cipher/cipher.c (_gcry_cipher_open_internal): Limit Poly1305-AEAD to
ChaCha20 cipher.
* tests/basic.c (_check_poly1305_cipher): Update test-vectors.
(check_ciphers): Limit Poly1305-AEAD checks to ChaCha20.
* tests/bench-slope.c (cipher_bench_one): Ditto.
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Latest Internet-Draft version for "ChaCha20 and Poly1305 for IETF protocols"
has added additional padding to Poly1305-AEAD and limited support IV size to
96-bits:
https://www.ietf.org/rfcdiff?url1=draft-nir-cfrg-chacha20-poly1305-03&difftype=--html&submit=Go!&url2=draft-irtf-cfrg-chacha20-poly1305-03
Patch makes Poly1305-AEAD implementation to match the changes and limits
Poly1305-AEAD to ChaCha20 only.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
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* cipher/Makefile.am: Add 'cipher-poly1305.c'.
* cipher/cipher-internal.h (gcry_cipher_handle): Add 'u_mode.poly1305'.
(_gcry_cipher_poly1305_encrypt, _gcry_cipher_poly1305_decrypt)
(_gcry_cipher_poly1305_setiv, _gcry_cipher_poly1305_authenticate)
(_gcry_cipher_poly1305_get_tag, _gcry_cipher_poly1305_check_tag): New.
* cipher/cipher-poly1305.c: New.
* cipher/cipher.c (_gcry_cipher_open_internal, cipher_setkey)
(cipher_reset, cipher_encrypt, cipher_decrypt, _gcry_cipher_setiv)
(_gcry_cipher_authenticate, _gcry_cipher_gettag)
(_gcry_cipher_checktag): Handle 'GCRY_CIPHER_MODE_POLY1305'.
(cipher_setiv): Move handling of 'GCRY_CIPHER_MODE_GCM' to ...
(_gcry_cipher_setiv): ... here, as with other modes.
* src/gcrypt.h.in: Add 'GCRY_CIPHER_MODE_POLY1305'.
* tests/basic.c (_check_poly1305_cipher, check_poly1305_cipher): New.
(check_ciphers): Add Poly1305 check.
(check_cipher_modes): Call 'check_poly1305_cipher'.
* tests/bench-slope.c (bench_gcm_encrypt_do_bench): Rename to
bench_aead_... and take nonce as argument.
(bench_gcm_decrypt_do_bench, bench_gcm_authenticate_do_bench): Ditto.
(bench_gcm_encrypt_do_bench, bench_gcm_decrypt_do_bench)
(bench_gcm_authenticate_do_bench, bench_poly1305_encrypt_do_bench)
(bench_poly1305_decrypt_do_bench)
(bench_poly1305_authenticate_do_bench, poly1305_encrypt_ops)
(poly1305_decrypt_ops, poly1305_authenticate_ops): New.
(cipher_modes): Add Poly1305.
(cipher_bench_one): Add special handling for Poly1305.
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Patch adds Poly1305 based AEAD cipher mode to libgcrypt. ChaCha20 variant
of this mode is proposed for use in TLS and ipsec:
https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04
http://tools.ietf.org/html/draft-nir-ipsecme-chacha20-poly1305-02
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
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