+ do {
+ b[--off] = (unsigned char)r;
+ } while (r >>= 8);
+
+ return off;
+}
+
+/*
+ * Absolute value of INT64_MIN: we can't just use -INT64_MIN as gcc produces
+ * overflow warnings.
+ */
+#define ABS_INT64_MIN ((uint64_t)INT64_MAX + (-(INT64_MIN + INT64_MAX)))
+
+/* signed version of asn1_get_uint64 */
+static int asn1_get_int64(int64_t *pr, const unsigned char *b, size_t blen,
+ int neg)
+{
+ uint64_t r;
+ if (asn1_get_uint64(&r, b, blen) == 0)
+ return 0;
+ if (neg) {
+ if (r <= INT64_MAX) {
+ /* Most significant bit is guaranteed to be clear, negation
+ * is guaranteed to be meaningful in platform-neutral sense. */
+ *pr = -(int64_t)r;
+ } else if (r == ABS_INT64_MIN) {
+ /* This never happens if INT64_MAX == ABS_INT64_MIN, e.g.
+ * on ones'-complement system. */
+ *pr = (int64_t)(0 - r);
+ } else {
+ ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_SMALL);
+ return 0;
+ }
+ } else {
+ if (r <= INT64_MAX) {
+ *pr = (int64_t)r;
+ } else {
+ ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_LARGE);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/* Convert ASN1 INTEGER content octets to ASN1_INTEGER structure */
+ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
+ long len)
+{
+ ASN1_INTEGER *ret = NULL;
+ size_t r;
+ int neg;
+
+ r = c2i_ibuf(NULL, NULL, *pp, len);
+
+ if (r == 0)
+ return NULL;
+
+ if ((a == NULL) || ((*a) == NULL)) {
+ ret = ASN1_INTEGER_new();
+ if (ret == NULL)
+ return NULL;
+ ret->type = V_ASN1_INTEGER;
+ } else
+ ret = *a;
+
+ if (ASN1_STRING_set(ret, NULL, r) == 0)
+ goto err;
+
+ c2i_ibuf(ret->data, &neg, *pp, len);
+
+ if (neg)
+ ret->type |= V_ASN1_NEG;
+
+ *pp += len;
+ if (a != NULL)
+ (*a) = ret;
+ return ret;
+ err:
+ ASN1err(ASN1_F_C2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
+ if ((a == NULL) || (*a != ret))
+ ASN1_INTEGER_free(ret);
+ return NULL;
+}
+
+static int asn1_string_get_int64(int64_t *pr, const ASN1_STRING *a, int itype)
+{
+ if (a == NULL) {
+ ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+ if ((a->type & ~V_ASN1_NEG) != itype) {
+ ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ASN1_R_WRONG_INTEGER_TYPE);
+ return 0;
+ }
+ return asn1_get_int64(pr, a->data, a->length, a->type & V_ASN1_NEG);
+}
+
+static int asn1_string_set_int64(ASN1_STRING *a, int64_t r, int itype)
+{
+ unsigned char tbuf[sizeof(r)];
+ size_t off;
+
+ a->type = itype;
+ if (r < 0) {
+ /* Most obvious '-r' triggers undefined behaviour for most
+ * common INT64_MIN. Even though below '0 - (uint64_t)r' can
+ * appear two's-complement centric, it does produce correct/
+ * expected result even on one's-complement. This is because
+ * cast to unsigned has to change bit pattern... */
+ off = asn1_put_uint64(tbuf, 0 - (uint64_t)r);
+ a->type |= V_ASN1_NEG;
+ } else {
+ off = asn1_put_uint64(tbuf, r);
+ a->type &= ~V_ASN1_NEG;
+ }
+ return ASN1_STRING_set(a, tbuf + off, sizeof(tbuf) - off);
+}
+
+static int asn1_string_get_uint64(uint64_t *pr, const ASN1_STRING *a,
+ int itype)
+{
+ if (a == NULL) {
+ ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+ if ((a->type & ~V_ASN1_NEG) != itype) {
+ ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_WRONG_INTEGER_TYPE);
+ return 0;
+ }
+ if (a->type & V_ASN1_NEG) {
+ ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
+ return 0;
+ }
+ return asn1_get_uint64(pr, a->data, a->length);
+}
+
+static int asn1_string_set_uint64(ASN1_STRING *a, uint64_t r, int itype)
+{
+ unsigned char tbuf[sizeof(r)];
+ size_t off;
+
+ a->type = itype;
+ off = asn1_put_uint64(tbuf, r);
+ return ASN1_STRING_set(a, tbuf + off, sizeof(tbuf) - off);
+}
+
+/*
+ * This is a version of d2i_ASN1_INTEGER that ignores the sign bit of ASN1
+ * integers: some broken software can encode a positive INTEGER with its MSB
+ * set as negative (it doesn't add a padding zero).
+ */
+
+ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
+ long length)
+{
+ ASN1_INTEGER *ret = NULL;
+ const unsigned char *p;
+ unsigned char *s;
+ long len;
+ int inf, tag, xclass;
+ int i;
+
+ if ((a == NULL) || ((*a) == NULL)) {
+ if ((ret = ASN1_INTEGER_new()) == NULL)
+ return (NULL);
+ ret->type = V_ASN1_INTEGER;
+ } else
+ ret = (*a);
+
+ p = *pp;
+ inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
+ if (inf & 0x80) {
+ i = ASN1_R_BAD_OBJECT_HEADER;
+ goto err;
+ }
+
+ if (tag != V_ASN1_INTEGER) {
+ i = ASN1_R_EXPECTING_AN_INTEGER;
+ goto err;
+ }
+
+ /*
+ * We must OPENSSL_malloc stuff, even for 0 bytes otherwise it signifies
+ * a missing NULL parameter.
+ */
+ s = OPENSSL_malloc((int)len + 1);
+ if (s == NULL) {
+ i = ERR_R_MALLOC_FAILURE;
+ goto err;
+ }
+ ret->type = V_ASN1_INTEGER;
+ if (len) {
+ if ((*p == 0) && (len != 1)) {
+ p++;
+ len--;
+ }
+ memcpy(s, p, (int)len);
+ p += len;
+ }
+
+ OPENSSL_free(ret->data);
+ ret->data = s;
+ ret->length = (int)len;
+ if (a != NULL)
+ (*a) = ret;
+ *pp = p;
+ return (ret);
+ err:
+ ASN1err(ASN1_F_D2I_ASN1_UINTEGER, i);
+ if ((a == NULL) || (*a != ret))
+ ASN1_INTEGER_free(ret);
+ return (NULL);
+}
+
+static ASN1_STRING *bn_to_asn1_string(const BIGNUM *bn, ASN1_STRING *ai,
+ int atype)
+{
+ ASN1_INTEGER *ret;
+ int len;
+
+ if (ai == NULL) {
+ ret = ASN1_STRING_type_new(atype);
+ } else {
+ ret = ai;
+ ret->type = atype;
+ }
+
+ if (ret == NULL) {
+ ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+
+ if (BN_is_negative(bn) && !BN_is_zero(bn))
+ ret->type |= V_ASN1_NEG_INTEGER;
+
+ len = BN_num_bytes(bn);
+
+ if (len == 0)
+ len = 1;
+
+ if (ASN1_STRING_set(ret, NULL, len) == 0) {
+ ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ /* Correct zero case */
+ if (BN_is_zero(bn))
+ ret->data[0] = 0;
+ else
+ len = BN_bn2bin(bn, ret->data);
+ ret->length = len;
+ return ret;
+ err:
+ if (ret != ai)
+ ASN1_INTEGER_free(ret);
+ return (NULL);
+}
+
+static BIGNUM *asn1_string_to_bn(const ASN1_INTEGER *ai, BIGNUM *bn,
+ int itype)
+{
+ BIGNUM *ret;
+
+ if ((ai->type & ~V_ASN1_NEG) != itype) {
+ ASN1err(ASN1_F_ASN1_STRING_TO_BN, ASN1_R_WRONG_INTEGER_TYPE);
+ return NULL;
+ }
+
+ ret = BN_bin2bn(ai->data, ai->length, bn);
+ if (ret == NULL) {
+ ASN1err(ASN1_F_ASN1_STRING_TO_BN, ASN1_R_BN_LIB);
+ return NULL;
+ }
+ if (ai->type & V_ASN1_NEG)
+ BN_set_negative(ret, 1);
+ return ret;
+}
+
+int ASN1_INTEGER_get_int64(int64_t *pr, const ASN1_INTEGER *a)
+{
+ return asn1_string_get_int64(pr, a, V_ASN1_INTEGER);
+}
+
+int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t r)
+{
+ return asn1_string_set_int64(a, r, V_ASN1_INTEGER);
+}
+
+int ASN1_INTEGER_get_uint64(uint64_t *pr, const ASN1_INTEGER *a)
+{
+ return asn1_string_get_uint64(pr, a, V_ASN1_INTEGER);
+}
+
+int ASN1_INTEGER_set_uint64(ASN1_INTEGER *a, uint64_t r)
+{
+ return asn1_string_set_uint64(a, r, V_ASN1_INTEGER);
+}