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krb5: Store a digest context in the crypto structure

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Creating and destroying an EVP_CTX_MD structure with every hash
operation is very expensive. Speed things up by caching one within
the krb5_crypto structure. krb5_crypto can already only be safely
used by one thread at a time - adding a message digest context here
shouldn't introduce any further threading risks.

Users of the stashed context must be careful to ensure that they
call no other hash functions whilst they are in the middle of using
the context.
This commit is contained in:
Simon Wilkinson
2018-05-14 14:21:28 +01:00
committed by Jeffrey Altman
parent fa1e998b53
commit e50faea7f0
12 changed files with 100 additions and 50 deletions
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18
lib/krb5/crypto-evp.c
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@@ -57,7 +57,8 @@ _krb5_evp_cleanup(krb5_context context, struct _krb5_key_data *kd)
}
int
_krb5_evp_digest_iov(const struct krb5_crypto_iov *iov,
_krb5_evp_digest_iov(krb5_crypto crypto,
const struct krb5_crypto_iov *iov,
int niov,
void *hash,
unsigned int *hsize,
@@ -68,9 +69,14 @@ _krb5_evp_digest_iov(const struct krb5_crypto_iov *iov,
int ret, i;
krb5_data current = {0,0};
ctx = EVP_MD_CTX_create();
if (ctx == NULL)
return 0;
if (crypto != NULL) {
if (crypto->mdctx == NULL)
crypto->mdctx = EVP_MD_CTX_create();
if (crypto->mdctx == NULL)
return 0;
ctx = crypto->mdctx;
} else
ctx = EVP_MD_CTX_create();
ret = EVP_DigestInit_ex(ctx, md, engine);
if (ret != 1)
@@ -100,7 +106,9 @@ _krb5_evp_digest_iov(const struct krb5_crypto_iov *iov,
ret = EVP_DigestFinal_ex(ctx, hash, hsize);
out:
EVP_MD_CTX_destroy(ctx);
if (crypto == NULL)
EVP_MD_CTX_destroy(ctx);
return ret;
}