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krb5: Add _krb5_evp_digest_iov

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Add a function which can apply an EVP message digest algorithm over
a set of iovecs to produce a signature.
This commit is contained in:
Simon Wilkinson
2018-05-14 13:42:42 +01:00
committed by Jeffrey Altman
parent eb5eae59a4
commit cb632bfdeb
1 changed files with 48 additions and 0 deletions
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48
lib/krb5/crypto-evp.c
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@@ -56,6 +56,54 @@ _krb5_evp_cleanup(krb5_context context, struct _krb5_key_data *kd)
EVP_CIPHER_CTX_cleanup(&key->dctx);
}
int
_krb5_evp_digest_iov(const struct krb5_crypto_iov *iov,
int niov,
void *hash,
unsigned int *hsize,
const EVP_MD *md,
ENGINE *engine)
{
EVP_MD_CTX *ctx;
int ret, i;
krb5_data current = {0,0};
ctx = EVP_MD_CTX_create();
if (ctx == NULL)
return 0;
ret = EVP_DigestInit_ex(ctx, md, engine);
if (ret != 1)
goto out;
for (i = 0; i < niov; i++) {
if (_krb5_crypto_iov_should_sign(&iov[i])) {
if ((char *)current.data + current.length == iov[i].data.data) {
current.length += iov[i].data.length;
} else {
if (current.data) {
ret = EVP_DigestUpdate(ctx, current.data, current.length);
if (ret != 1)
goto out;
}
current = iov[i].data;
}
}
}
if (current.data) {
ret = EVP_DigestUpdate(ctx, current.data, current.length);
if (ret != 1)
goto out;
}
ret = EVP_DigestFinal_ex(ctx, hash, hsize);
out:
EVP_MD_CTX_destroy(ctx);
return ret;
}
krb5_error_code
_krb5_evp_encrypt(krb5_context context,
struct _krb5_key_data *key,