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Declare ChaCha20 cipher and AEAD

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Declare algorithms for ChaCha20 and ChaCha20-Poly1305, and a
corresponding (common) key type.

Don't declare Poly1305 as a separate algorithm because it's a one-time
authenticator, not a MAC, so the API isn't suitable for it (no way to
use a nonce).
This commit is contained in:
Gilles Peskine
2019-05-06 15:20:04 +02:00
parent f7e7b01a25
commit 3e79c8ecfd
2 changed files with 39 additions and 0 deletions
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27
include/psa/crypto_values.h
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@ -402,6 +402,15 @@
* legacy protocols. */
#define PSA_KEY_TYPE_ARC4 ((psa_key_type_t)0x40000004)
/** Key for the ChaCha20 stream cipher or the Chacha20-Poly1305 AEAD algorithm.
*
* ChaCha20 and the ChaCha20_Poly1305 construction are defined in RFC 7539.
*
* Implementations must support 12-byte nonces, may support 8-byte nonces,
* and should reject other sizes.
*/
#define PSA_KEY_TYPE_CHACHA20 ((psa_key_type_t)0x40000005)
/** RSA public key. */
#define PSA_KEY_TYPE_RSA_PUBLIC_KEY ((psa_key_type_t)0x60010000)
/** RSA key pair (private and public key). */
@ -836,6 +845,18 @@
*/
#define PSA_ALG_ARC4 ((psa_algorithm_t)0x04800001)
/** The ChaCha20 stream cipher.
*
* ChaCha20 is defined in RFC 7539.
*
* The nonce size for psa_cipher_set_iv() or psa_cipher_generate_iv()
* must be 12.
*
* The initial block counter is always 0.
*
*/
#define PSA_ALG_CHACHA20 ((psa_algorithm_t)0x04800005)
/** The CTR stream cipher mode.
*
* CTR is a stream cipher which is built from a block cipher.
@ -900,6 +921,11 @@
/** The Chacha20-Poly1305 AEAD algorithm.
*
* The ChaCha20_Poly1305 construction is defined in RFC 7539.
*
* Implementations must support 12-byte nonces, may support 8-byte nonces,
* and should reject other sizes.
*
* Implementations must support 16-byte tags and should reject other sizes.
*/
#define PSA_ALG_CHACHA20_POLY1305 ((psa_algorithm_t)0x06001005)
@ -945,6 +971,7 @@
( \
PSA__ALG_AEAD_WITH_DEFAULT_TAG_LENGTH__CASE(aead_alg, PSA_ALG_CCM) \
PSA__ALG_AEAD_WITH_DEFAULT_TAG_LENGTH__CASE(aead_alg, PSA_ALG_GCM) \
PSA__ALG_AEAD_WITH_DEFAULT_TAG_LENGTH__CASE(aead_alg, PSA_ALG_CHACHA20_POLY1305) \
0)
#define PSA__ALG_AEAD_WITH_DEFAULT_TAG_LENGTH__CASE(aead_alg, ref) \
PSA_ALG_AEAD_WITH_TAG_LENGTH(aead_alg, 0) == \