From fced7b02623e3ccace714f8adceed735698a9c8b Mon Sep 17 00:00:00 2001 From: Stephan Mueller Date: Wed, 12 Nov 2014 05:29:00 +0100 Subject: [PATCH] crypto: doc - AEAD API documentation The API function calls exported by the kernel crypto API for AEAD ciphers to be used by consumers are documented. Signed-off-by: Stephan Mueller Signed-off-by: Herbert Xu --- include/linux/crypto.h | 251 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 251 insertions(+) diff --git a/include/linux/crypto.h b/include/linux/crypto.h index 39c8fc6d3313..4704e71a31fe 100644 --- a/include/linux/crypto.h +++ b/include/linux/crypto.h @@ -1174,11 +1174,55 @@ static inline void ablkcipher_request_set_crypt( req->info = iv; } +/** + * DOC: Authenticated Encryption With Associated Data (AEAD) Cipher API + * + * The AEAD cipher API is used with the ciphers of type CRYPTO_ALG_TYPE_AEAD + * (listed as type "aead" in /proc/crypto) + * + * The most prominent examples for this type of encryption is GCM and CCM. + * However, the kernel supports other types of AEAD ciphers which are defined + * with the following cipher string: + * + * authenc(keyed message digest, block cipher) + * + * For example: authenc(hmac(sha256), cbc(aes)) + * + * The example code provided for the asynchronous block cipher operation + * applies here as well. Naturally all *ablkcipher* symbols must be exchanged + * the *aead* pendants discussed in the following. In addtion, for the AEAD + * operation, the aead_request_set_assoc function must be used to set the + * pointer to the associated data memory location before performing the + * encryption or decryption operation. In case of an encryption, the associated + * data memory is filled during the encryption operation. For decryption, the + * associated data memory must contain data that is used to verify the integrity + * of the decrypted data. Another deviation from the asynchronous block cipher + * operation is that the caller should explicitly check for -EBADMSG of the + * crypto_aead_decrypt. That error indicates an authentication error, i.e. + * 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. + */ + static inline struct crypto_aead *__crypto_aead_cast(struct crypto_tfm *tfm) { return (struct crypto_aead *)tfm; } +/** + * crypto_alloc_aead() - allocate AEAD cipher handle + * @alg_name: is the cra_name / name or cra_driver_name / driver name of the + * AEAD cipher + * @type: specifies the type of the cipher + * @mask: specifies the mask for the cipher + * + * Allocate a cipher handle for an AEAD. The returned struct + * crypto_aead is the cipher handle that is required for any subsequent + * API invocation for that AEAD. + * + * Return: allocated cipher handle in case of success; IS_ERR() is true in case + * of an error, PTR_ERR() returns the error code. + */ struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask); static inline struct crypto_tfm *crypto_aead_tfm(struct crypto_aead *tfm) @@ -1186,6 +1230,10 @@ static inline struct crypto_tfm *crypto_aead_tfm(struct crypto_aead *tfm) return &tfm->base; } +/** + * crypto_free_aead() - zeroize and free aead handle + * @tfm: cipher handle to be freed + */ static inline void crypto_free_aead(struct crypto_aead *tfm) { crypto_free_tfm(crypto_aead_tfm(tfm)); @@ -1196,16 +1244,47 @@ static inline struct aead_tfm *crypto_aead_crt(struct crypto_aead *tfm) return &crypto_aead_tfm(tfm)->crt_aead; } +/** + * crypto_aead_ivsize() - obtain IV size + * @tfm: cipher handle + * + * The size of the IV for the aead referenced by the cipher handle is + * returned. This IV size may be zero if the cipher does not need an IV. + * + * Return: IV size in bytes + */ static inline unsigned int crypto_aead_ivsize(struct crypto_aead *tfm) { return crypto_aead_crt(tfm)->ivsize; } +/** + * crypto_aead_authsize() - obtain maximum authentication data size + * @tfm: cipher handle + * + * The maximum size of the authentication data for the AEAD cipher referenced + * by the AEAD cipher handle is returned. The authentication data size may be + * zero if the cipher implements a hard-coded maximum. + * + * The authentication data may also be known as "tag value". + * + * Return: authentication data size / tag size in bytes + */ static inline unsigned int crypto_aead_authsize(struct crypto_aead *tfm) { return crypto_aead_crt(tfm)->authsize; } +/** + * crypto_aead_blocksize() - obtain block size of cipher + * @tfm: cipher handle + * + * The block size for the AEAD referenced with the cipher handle is returned. + * The caller may use that information to allocate appropriate memory for the + * data returned by the encryption or decryption operation + * + * Return: block size of cipher + */ static inline unsigned int crypto_aead_blocksize(struct crypto_aead *tfm) { return crypto_tfm_alg_blocksize(crypto_aead_tfm(tfm)); @@ -1231,6 +1310,22 @@ static inline void crypto_aead_clear_flags(struct crypto_aead *tfm, u32 flags) crypto_tfm_clear_flags(crypto_aead_tfm(tfm), flags); } +/** + * crypto_aead_setkey() - set key for cipher + * @tfm: cipher handle + * @key: buffer holding the key + * @keylen: length of the key in bytes + * + * The caller provided key is set for the AEAD referenced by the cipher + * handle. + * + * Note, the key length determines the cipher type. Many block ciphers implement + * different cipher modes depending on the key size, such as AES-128 vs AES-192 + * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128 + * is performed. + * + * Return: 0 if the setting of the key was successful; < 0 if an error occurred + */ static inline int crypto_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { @@ -1239,6 +1334,16 @@ static inline int crypto_aead_setkey(struct crypto_aead *tfm, const u8 *key, return crt->setkey(crt->base, key, keylen); } +/** + * crypto_aead_setauthsize() - set authentication data size + * @tfm: cipher handle + * @authsize: size of the authentication data / tag in bytes + * + * Set the authentication data size / tag size. AEAD requires an authentication + * tag (or MAC) in addition to the associated data. + * + * Return: 0 if the setting of the key was successful; < 0 if an error occurred + */ int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize); static inline struct crypto_aead *crypto_aead_reqtfm(struct aead_request *req) @@ -1246,27 +1351,105 @@ static inline struct crypto_aead *crypto_aead_reqtfm(struct aead_request *req) return __crypto_aead_cast(req->base.tfm); } +/** + * crypto_aead_encrypt() - encrypt plaintext + * @req: reference to the aead_request handle that holds all information + * needed to perform the cipher operation + * + * Encrypt plaintext data using the aead_request handle. That data structure + * and how it is filled with data is discussed with the aead_request_* + * functions. + * + * IMPORTANT NOTE The encryption operation creates the authentication data / + * tag. That data is concatenated with the created ciphertext. + * The ciphertext memory size is therefore the given number of + * block cipher blocks + the size defined by the + * crypto_aead_setauthsize invocation. The caller must ensure + * that sufficient memory is available for the ciphertext and + * the authentication tag. + * + * Return: 0 if the cipher operation was successful; < 0 if an error occurred + */ static inline int crypto_aead_encrypt(struct aead_request *req) { return crypto_aead_crt(crypto_aead_reqtfm(req))->encrypt(req); } +/** + * crypto_aead_decrypt() - decrypt ciphertext + * @req: reference to the ablkcipher_request handle that holds all information + * needed to perform the cipher operation + * + * Decrypt ciphertext data using the aead_request handle. That data structure + * and how it is filled with data is discussed with the aead_request_* + * functions. + * + * IMPORTANT NOTE The caller must concatenate the ciphertext followed by the + * authentication data / tag. That authentication data / tag + * must have the size defined by the crypto_aead_setauthsize + * invocation. + * + * + * Return: 0 if the cipher operation was successful; -EBADMSG: The AEAD + * cipher operation performs the authentication of the data during the + * decryption operation. Therefore, the function returns this error if + * the authentication of the ciphertext was unsuccessful (i.e. the + * integrity of the ciphertext or the associated data was violated); + * < 0 if an error occurred. + */ static inline int crypto_aead_decrypt(struct aead_request *req) { return crypto_aead_crt(crypto_aead_reqtfm(req))->decrypt(req); } +/** + * DOC: Asynchronous AEAD Request Handle + * + * The aead_request data structure contains all pointers to data required for + * the AEAD cipher operation. This includes the cipher handle (which can be + * used by multiple aead_request instances), pointer to plaintext and + * ciphertext, asynchronous callback function, etc. It acts as a handle to the + * aead_request_* API calls in a similar way as AEAD handle to the + * crypto_aead_* API calls. + */ + +/** + * crypto_aead_reqsize() - obtain size of the request data structure + * @tfm: cipher handle + * + * Return: number of bytes + */ static inline unsigned int crypto_aead_reqsize(struct crypto_aead *tfm) { return crypto_aead_crt(tfm)->reqsize; } +/** + * aead_request_set_tfm() - update cipher handle reference in request + * @req: request handle to be modified + * @tfm: cipher handle that shall be added to the request handle + * + * Allow the caller to replace the existing aead handle in the request + * data structure with a different one. + */ static inline void aead_request_set_tfm(struct aead_request *req, struct crypto_aead *tfm) { req->base.tfm = crypto_aead_tfm(crypto_aead_crt(tfm)->base); } +/** + * aead_request_alloc() - allocate request data structure + * @tfm: cipher handle to be registered with the request + * @gfp: memory allocation flag that is handed to kmalloc by the API call. + * + * Allocate the request data structure that must be used with the AEAD + * encrypt and decrypt API calls. During the allocation, the provided aead + * handle is registered in the request data structure. + * + * Return: allocated request handle in case of success; IS_ERR() is true in case + * of an error, PTR_ERR() returns the error code. + */ static inline struct aead_request *aead_request_alloc(struct crypto_aead *tfm, gfp_t gfp) { @@ -1280,11 +1463,40 @@ static inline struct aead_request *aead_request_alloc(struct crypto_aead *tfm, return req; } +/** + * aead_request_free() - zeroize and free request data structure + * @req: request data structure cipher handle to be freed + */ static inline void aead_request_free(struct aead_request *req) { kzfree(req); } +/** + * aead_request_set_callback() - set asynchronous callback function + * @req: request handle + * @flags: specify zero or an ORing of the flags + * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and + * increase the wait queue beyond the initial maximum size; + * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep + * @compl: callback function pointer to be registered with the request handle + * @data: The data pointer refers to memory that is not used by the kernel + * crypto API, but provided to the callback function for it to use. Here, + * the caller can provide a reference to memory the callback function can + * operate on. As the callback function is invoked asynchronously to the + * related functionality, it may need to access data structures of the + * related functionality which can be referenced using this pointer. The + * callback function can access the memory via the "data" field in the + * crypto_async_request data structure provided to the callback function. + * + * Setting the callback function that is triggered once the cipher operation + * completes + * + * The callback function is registered with the aead_request handle and + * must comply with the following template: + * + * void callback_function(struct crypto_async_request *req, int error) + */ static inline void aead_request_set_callback(struct aead_request *req, u32 flags, crypto_completion_t compl, @@ -1295,6 +1507,36 @@ static inline void aead_request_set_callback(struct aead_request *req, req->base.flags = flags; } +/** + * aead_request_set_crypt - set data buffers + * @req: request handle + * @src: source scatter / gather list + * @dst: destination scatter / gather list + * @cryptlen: number of bytes to process from @src + * @iv: IV for the cipher operation which must comply with the IV size defined + * by crypto_aead_ivsize() + * + * Setting the source data and destination data scatter / gather lists. + * + * For encryption, the source is treated as the plaintext and the + * destination is the ciphertext. For a decryption operation, the use is + * reversed: the source is the ciphertext and the destination is the plaintext. + * + * IMPORTANT NOTE AEAD requires an authentication tag (MAC). For decryption, + * the caller must concatenate the ciphertext followed by the + * authentication tag and provide the entire data stream to the + * decryption operation (i.e. the data length used for the + * initialization of the scatterlist and the data length for the + * decryption operation is identical). For encryption, however, + * the authentication tag is created while encrypting the data. + * The destination buffer must hold sufficient space for the + * ciphertext and the authentication tag while the encryption + * invocation must only point to the plaintext data size. The + * following code snippet illustrates the memory usage + * buffer = kmalloc(ptbuflen + (enc ? authsize : 0)); + * sg_init_one(&sg, buffer, ptbuflen + (enc ? authsize : 0)); + * aead_request_set_crypt(req, &sg, &sg, ptbuflen, iv); + */ static inline void aead_request_set_crypt(struct aead_request *req, struct scatterlist *src, struct scatterlist *dst, @@ -1306,6 +1548,15 @@ static inline void aead_request_set_crypt(struct aead_request *req, req->iv = iv; } +/** + * aead_request_set_assoc() - set the associated data scatter / gather list + * @req: request handle + * @assoc: associated data scatter / gather list + * @assoclen: number of bytes to process from @assoc + * + * For encryption, the memory is filled with the associated data. For + * decryption, the memory must point to the associated data. + */ static inline void aead_request_set_assoc(struct aead_request *req, struct scatterlist *assoc, unsigned int assoclen) -- 2.11.0