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authorStephan Mueller <smueller@chronox.de>2015-08-03 09:08:05 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2015-08-04 17:41:33 +0800
commitf6e45c24f401f3d0e648bfba304c83b64d763559 (patch)
treee7683ebfea775e14897211d9cfe96126f37761af /include/crypto
parent327cbbabfb77c321fb9f21068c18e6bb951d07a7 (diff)
crypto: doc - AEAD API conversion
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>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/aead.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/crypto/aead.h b/include/crypto/aead.h
index 7169ad04acc0..14e35364cdfa 100644
--- a/include/crypto/aead.h
+++ b/include/crypto/aead.h
@@ -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.
*/
/**

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