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util: add virRandomToken API

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A random token is simply a string of random bytes formatted in
hexidecimal.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2020-11-19 12:22:47 +00:00
parent d6a1d1841a
commit 1ca3959712
3 changed files with 20 additions and 0 deletions
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1
src/libvirt_private.syms
View File

@ -3081,6 +3081,7 @@ virRandomBits;
virRandomBytes;
virRandomGenerateWWN;
virRandomInt;
virRandomToken;
# util/virresctrl.h

18
src/util/virrandom.c
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@ -161,3 +161,21 @@ virRandomGenerateWWN(char **wwn,
(unsigned long long)virRandomBits(36));
return 0;
}
char *virRandomToken(size_t len)
{
g_autofree unsigned char *data = g_new0(unsigned char, len);
g_autofree char *token = g_new0(char, (len * 2) + 1);
static const char hex[] = "0123456789abcdef";
size_t i;
if (virRandomBytes(data, len) < 0)
return NULL;
for (i = 0; i < len; i++) {
token[(i*2)] = hex[data[i] & 0xf];
token[(i*2)+1] = hex[(data[i] >> 4) & 0xf];
}
return g_steal_pointer(&token);
}

1
src/util/virrandom.h
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@ -26,3 +26,4 @@ uint32_t virRandomInt(uint32_t max);
int virRandomBytes(unsigned char *buf, size_t buflen)
ATTRIBUTE_NONNULL(1) G_GNUC_WARN_UNUSED_RESULT G_GNUC_NO_INLINE;
int virRandomGenerateWWN(char **wwn, const char *virt_type) G_GNUC_NO_INLINE;
char *virRandomToken(size_t len);