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Add documentation notes about the required size of the signature buffers

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k-stachowiak 2019-05-31 20:16:50 +02:00
parent 199707fcff
commit eee98e9d82
2 changed files with 7 additions and 0 deletions
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4
include/mbedtls/pk.h
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@ -343,6 +343,10 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
*
* \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
* For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
*
* \note In order to ensure enough space for the signature, the
* \p sig buffer size must be of at least
* `max(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)` bytes.
*/
int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,

3
include/mbedtls/rsa.h
View file

@ -819,6 +819,7 @@ int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*
* \note For PKCS#1 v2.1 encoding, see comments on
* mbedtls_rsa_rsassa_pss_sign() for details on
@ -862,6 +863,7 @@ int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*/
int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
@ -902,6 +904,7 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*
* \note The \p hash_id in the RSA context is the one used for the
* encoding. \p md_alg in the function call is the type of hash