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authormarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
committermarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
commitff48c0d9098080b51ea12710029135916d117806 (patch)
tree96e6af9caf170ba21a1027b24e306a07e27d7b75 /openssl/crypto/asn1/a_bitstr.c
parentbb731f5ac92655c4860a41fa818a7a63005f8369 (diff)
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svn merge -r514:HEAD ^/branches/released .
Diffstat (limited to 'openssl/crypto/asn1/a_bitstr.c')
-rw-r--r--openssl/crypto/asn1/a_bitstr.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/openssl/crypto/asn1/a_bitstr.c b/openssl/crypto/asn1/a_bitstr.c
index 0fb9ce0c2..34179960b 100644
--- a/openssl/crypto/asn1/a_bitstr.c
+++ b/openssl/crypto/asn1/a_bitstr.c
@@ -223,3 +223,26 @@ int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
return((a->data[w]&v) != 0);
}
+/*
+ * Checks if the given bit string contains only bits specified by
+ * the flags vector. Returns 0 if there is at least one bit set in 'a'
+ * which is not specified in 'flags', 1 otherwise.
+ * 'len' is the length of 'flags'.
+ */
+int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
+ unsigned char *flags, int flags_len)
+ {
+ int i, ok;
+ /* Check if there is one bit set at all. */
+ if (!a || !a->data) return 1;
+
+ /* Check each byte of the internal representation of the bit string. */
+ ok = 1;
+ for (i = 0; i < a->length && ok; ++i)
+ {
+ unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
+ /* We are done if there is an unneeded bit set. */
+ ok = (a->data[i] & mask) == 0;
+ }
+ return ok;
+ }