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crypto: doc - AEAD API conversion

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The AEAD API changes are now reflected in the crypto API doc book.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2015-08-03 09:08:05 +02:00 committed by Herbert Xu
parent 327cbbabfb
commit f6e45c24f4
2 changed files with 26 additions and 2 deletions
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4
Documentation/DocBook/crypto-API.tmpl
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@ -585,7 +585,7 @@ kernel crypto API | IPSEC Layer
+-----------+ |
| | (1)
| aead | <----------------------------------- esp_output
| (seqniv) | ---+
| (seqiv) | ---+
+-----------+ |
| (2)
+-----------+ |
@ -1687,7 +1687,7 @@ read(opfd, out, outlen);
!Pinclude/linux/crypto.h Block Cipher Algorithm Definitions
!Finclude/linux/crypto.h crypto_alg
!Finclude/linux/crypto.h ablkcipher_alg
!Finclude/linux/crypto.h aead_alg
!Finclude/crypto/aead.h aead_alg
!Finclude/linux/crypto.h blkcipher_alg
!Finclude/linux/crypto.h cipher_alg
!Finclude/crypto/rng.h rng_alg

24
include/crypto/aead.h
View File

@ -45,6 +45,30 @@
* a breach in the integrity of the message. In essence, that -EBADMSG error
* code is the key bonus an AEAD cipher has over "standard" block chaining
* modes.
*
* Memory Structure:
*
* To support the needs of the most prominent user of AEAD ciphers, namely
* IPSEC, the AEAD ciphers have a special memory layout the caller must adhere
* to.
*
* The scatter list pointing to the input data must contain:
*
* * for RFC4106 ciphers, the concatenation of
* associated authentication data || IV || plaintext or ciphertext. Note, the
* same IV (buffer) is also set with the aead_request_set_crypt call. Note,
* the API call of aead_request_set_ad must provide the length of the AAD and
* the IV. The API call of aead_request_set_crypt only points to the size of
* the input plaintext or ciphertext.
*
* * for "normal" AEAD ciphers, the concatenation of
* associated authentication data || plaintext or ciphertext.
*
* It is important to note that if multiple scatter gather list entries form
* the input data mentioned above, the first entry must not point to a NULL
* buffer. If there is any potential where the AAD buffer can be NULL, the
* calling code must contain a precaution to ensure that this does not result
* in the first scatter gather list entry pointing to a NULL buffer.
*/
/**