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HMAC_Init_ex with NULL key to recover Hmac initial state

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This commit is contained in:
Takashi Kojo
2017-11-22 06:53:52 +09:00
committed by Jacob Barthelmeh
parent 8f1fc8ad2e
commit f38a321e64
2 changed files with 12 additions and 4 deletions
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14
src/ssl.c
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@ -24645,7 +24645,7 @@ int wolfSSL_HMAC_CTX_Init(WOLFSSL_HMAC_CTX* ctx)
int wolfSSL_HMAC_Init_ex(WOLFSSL_HMAC_CTX* ctx, const void* key,
int keylen, const EVP_MD* type, WOLFSSL_ENGINE* e)
{
WOLFSSL_ENTER("wolfSSL_HMAC_Init_ex()");
WOLFSSL_ENTER("wolfSSL_HMAC_Init_ex");
/* WOLFSSL_ENGINE not used, call wolfSSL_HMAC_Init */
(void)e;
@ -24805,10 +24805,16 @@ int wolfSSL_HMAC_Init(WOLFSSL_HMAC_CTX* ctx, const void* key, int keylen,
wc_HmacFree(&ctx->hmac);
return WOLFSSL_FAILURE;
}
XMEMCPY((byte *)&ctx->save_key, (const byte*)key, (word32)keylen);
ctx->save_len = keylen;
}
/* OpenSSL compat, no error */
} else if(ctx->type) {
WOLFSSL_MSG("recover hmac");
if (wc_HmacInit(&ctx->hmac, NULL, INVALID_DEVID) == 0) {
wc_HmacSetKey(&ctx->hmac, ctx->type, (byte *)&ctx->save_key,
(word32)ctx->save_len);
}
} else {
WOLFSSL_MSG("no key or keylen");
return WOLFSSL_FAILURE;
}
return WOLFSSL_SUCCESS;

2
wolfssl/openssl/hmac.h
View File

@ -53,6 +53,8 @@ WOLFSSL_API unsigned char* wolfSSL_HMAC(const WOLFSSL_EVP_MD* evp_md,
typedef struct WOLFSSL_HMAC_CTX {
Hmac hmac;
int type;
byte save_key[HMAC_BLOCK_SIZE]; /* save initial hmac after wc_HmacSetKey */
word32 save_len;
} WOLFSSL_HMAC_CTX;