diff options
Diffstat (limited to 'crypto/asn1/a_bitstr.c')
| -rw-r--r-- | crypto/asn1/a_bitstr.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/crypto/asn1/a_bitstr.c b/crypto/asn1/a_bitstr.c index 6e92ff5a84..34179960b8 100644 --- a/crypto/asn1/a_bitstr.c +++ b/crypto/asn1/a_bitstr.c @@ -165,7 +165,7 @@ ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, *pp=p; return(ret); err: - ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); + ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i); if ((ret != NULL) && ((a == NULL) || (*a != ret))) M_ASN1_BIT_STRING_free(ret); return(NULL); @@ -183,9 +183,11 @@ int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) iv= ~v; if (!value) v=0; + if (a == NULL) + return 0; + a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ - if (a == NULL) return(0); if ((a->length < (w+1)) || (a->data == NULL)) { if (!value) return(1); /* Don't need to set */ @@ -221,3 +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; + } |