diff options
Diffstat (limited to 'lib/crypto/c_src/hmac.c')
| -rw-r--r-- | lib/crypto/c_src/hmac.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/lib/crypto/c_src/hmac.c b/lib/crypto/c_src/hmac.c index 1a4f96e1d5..5e2c68bfee 100644 --- a/lib/crypto/c_src/hmac.c +++ b/lib/crypto/c_src/hmac.c @@ -18,6 +18,16 @@ * %CopyrightEnd% */ + +/***************************************************************** + * + * This file has functions for compatibility with cryptolibs + * lacking the EVP_Digest API. + * + * See mac.c for the implementation using the EVP interface. + * + ****************************************************************/ + #ifndef HAS_EVP_PKEY_CTX #include "hmac.h" @@ -215,4 +225,44 @@ ERL_NIF_TERM hmac_final_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]) return ret; } + + +int hmac_low_level(ErlNifEnv* env, const EVP_MD *md, + ErlNifBinary key_bin, ErlNifBinary text, + ErlNifBinary *ret_bin, int *ret_bin_alloc, ERL_NIF_TERM *return_term) +{ + unsigned int size_int; + size_t size; + + /* Find the needed space */ + if (HMAC(md, + key_bin.data, (int)key_bin.size, + text.data, text.size, + NULL, &size_int) == NULL) + { + *return_term = EXCP_ERROR(env, "Get HMAC size failed"); + return 0; + } + + size = (size_t)size_int; /* Otherwise "size" is unused in 0.9.8.... */ + if (!enif_alloc_binary(size, ret_bin)) + { + *return_term = EXCP_ERROR(env, "Alloc binary"); + return 0; + } + *ret_bin_alloc = 1; + + /* And do the real HMAC calc */ + if (HMAC(md, + key_bin.data, (int)key_bin.size, + text.data, text.size, + ret_bin->data, &size_int) == NULL) + { + *return_term = EXCP_ERROR(env, "HMAC sign failed"); + return 0; + } + + return 1; +} + #endif |