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Minor fixes to comments

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Brian Murray 2016-09-13 14:21:01 -07:00 committed by Simon Butcher
parent 3d64431a33
commit 5168618294
2 changed files with 8 additions and 7 deletions
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13
include/mbedtls/cmac.h
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@ -57,7 +57,8 @@ void mbedtls_cmac_init( mbedtls_cmac_context *ctx );
* \brief Initialize the CMAC context * \brief Initialize the CMAC context
* *
* \param ctx CMAC context to be initialized * \param ctx CMAC context to be initialized
* \param cipher cipher to use * \param cipher cipher to use.
Cipher block size must be 8 bytes or 16 bytes.
* \param key encryption key * \param key encryption key
* \param keybits encryption key size in bits (must be acceptable by the cipher) * \param keybits encryption key size in bits (must be acceptable by the cipher)
* *
@ -84,8 +85,8 @@ void mbedtls_cmac_free( mbedtls_cmac_context *ctx );
* \param in_len length of the input data in bytes * \param in_len length of the input data in bytes
* \param tag buffer for holding the generated tag * \param tag buffer for holding the generated tag
* \param tag_len length of the tag to generate in bytes * \param tag_len length of the tag to generate in bytes
* Must be 2, 4, 6, 8 if cipher block size is 64 * Must be 2, 4, 6, 8 if cipher block size is 8
* Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 128 * Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 16
* *
* \return 0 if successful * \return 0 if successful
*/ */
@ -101,8 +102,8 @@ int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
* \param in_len length of the input data in bytes * \param in_len length of the input data in bytes
* \param tag buffer holding the tag to verify * \param tag buffer holding the tag to verify
* \param tag_len length of the tag to verify in bytes * \param tag_len length of the tag to verify in bytes
* Must be 2, 4, 6, 8 if cipher block size is 64 * Must be 2, 4, 6, 8 if cipher block size is 8
* Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 128 * Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 16
* \return 0 if successful and authenticated * \return 0 if successful and authenticated
* MBEDTLS_ERR_CMAC_VERIFY_FAILED if tag does not match * MBEDTLS_ERR_CMAC_VERIFY_FAILED if tag does not match
*/ */
@ -119,7 +120,7 @@ int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
* \param key_len PRF key length * \param key_len PRF key length
* \param input buffer holding the input data * \param input buffer holding the input data
* \param in_len length of the input data in bytes * \param in_len length of the input data in bytes
* \param tag buffer holding the tag to verify (16 bytes) * \param tag buffer holding the generated pseudorandom output
* *
* \return 0 if successful * \return 0 if successful
*/ */

2
library/cmac.c
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@ -64,7 +64,7 @@ void mbedtls_cmac_init( mbedtls_cmac_context *ctx )
/* /*
* Multiplication by u in the Galois field of GF(2^n) * Multiplication by u in the Galois field of GF(2^n)
* *
* As explained in the paper, this can be computed: * As explained in NIST SP 800-38B, this can be computed:
* If MSB(p) = 0, then p = (p << 1) * If MSB(p) = 0, then p = (p << 1)
* If MSB(p) = 1, then p = (p << 1) ^ R_n * If MSB(p) = 1, then p = (p << 1) ^ R_n
* with R_64 = 0x1B and R_128 = 0x87 * with R_64 = 0x1B and R_128 = 0x87