* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* ====================================================================
*/
+#include <e_os.h>
+
+#ifndef OPENSSL_NO_CMS
#include <string.h>
#include <openssl/dh.h>
#include <openssl/evp.h>
/* Key derivation from X9.42/RFC2631 */
+/* Uses CMS functions, hence the #ifdef wrapper. */
-#define DH_KDF_MAX (1L << 30)
+#define DH_KDF_MAX (1L << 30)
/* Skip past an ASN1 structure: for OBJECT skip content octets too */
static int skip_asn1(unsigned char **pp, long *plen, int exptag)
- {
- const unsigned char *q = *pp;
- int i, tag, xclass;
- long tmplen;
- i = ASN1_get_object(&q, &tmplen, &tag, &xclass, *plen);
- if (i & 0x80)
- return 0;
- if (tag != exptag || xclass != V_ASN1_UNIVERSAL)
- return 0;
- if (tag == V_ASN1_OBJECT)
- q += tmplen;
- *plen -= q - *pp;
- *pp = (unsigned char *)q;
- return 1;
- }
+{
+ const unsigned char *q = *pp;
+ int i, tag, xclass;
+ long tmplen;
+ i = ASN1_get_object(&q, &tmplen, &tag, &xclass, *plen);
+ if (i & 0x80)
+ return 0;
+ if (tag != exptag || xclass != V_ASN1_UNIVERSAL)
+ return 0;
+ if (tag == V_ASN1_OBJECT)
+ q += tmplen;
+ *plen -= q - *pp;
+ *pp = (unsigned char *)q;
+ return 1;
+}
-/* Encode the DH shared info structure, return an offset to the counter
- * value so we can update the structure without reencoding it.
+/*
+ * Encode the DH shared info structure, return an offset to the counter value
+ * so we can update the structure without reencoding it.
*/
-
static int dh_sharedinfo_encode(unsigned char **pder, unsigned char **pctr,
- ASN1_OBJECT *key_oid, size_t outlen,
- const unsigned char *ukm, size_t ukmlen)
- {
- unsigned char *p;
- int derlen;
- long tlen;
- /* "magic" value to check offset is sane */
- static unsigned char ctr[4] = {0xF3, 0x17, 0x22, 0x53};
- X509_ALGOR atmp;
- ASN1_OCTET_STRING ctr_oct, ukm_oct, *pukm_oct;
- ASN1_TYPE ctr_atype;
- if (ukmlen > DH_KDF_MAX || outlen > DH_KDF_MAX)
- return 0;
- ctr_oct.data = ctr;
- ctr_oct.length = 4;
- ctr_oct.flags = 0;
- ctr_oct.type = V_ASN1_OCTET_STRING;
- ctr_atype.type = V_ASN1_OCTET_STRING;
- ctr_atype.value.octet_string = &ctr_oct;
- atmp.algorithm = key_oid;
- atmp.parameter = &ctr_atype;
- if (ukm)
- {
- ukm_oct.type = V_ASN1_OCTET_STRING;
- ukm_oct.flags = 0;
- ukm_oct.data = (unsigned char *)ukm;
- ukm_oct.length = ukmlen;
- pukm_oct = &ukm_oct;
- }
- else
- pukm_oct = NULL;
- derlen = CMS_SharedInfo_encode(pder, &atmp, pukm_oct, outlen);
- if (derlen <= 0)
- return 0;
- p = *pder;
- tlen = derlen;
- if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
- return 0;
- if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
- return 0;
- if (!skip_asn1(&p, &tlen, V_ASN1_OBJECT))
- return 0;
- if (!skip_asn1(&p, &tlen, V_ASN1_OCTET_STRING))
- return 0;
- if (memcmp(p, ctr, 4))
- return 0;
- *pctr = p;
- return derlen;
- }
-
-int DH_KDF_X9_42(unsigned char *out, size_t outlen,
- const unsigned char *Z, size_t Zlen,
- ASN1_OBJECT *key_oid,
- const unsigned char *ukm, size_t ukmlen,
- const EVP_MD *md)
- {
- EVP_MD_CTX mctx;
- int rv = 0;
- unsigned int i;
- size_t mdlen;
- unsigned char *der = NULL, *ctr;
- int derlen;
- if (Zlen > DH_KDF_MAX)
- return 0;
- mdlen = EVP_MD_size(md);
- EVP_MD_CTX_init(&mctx);
- derlen = dh_sharedinfo_encode(&der, &ctr, key_oid, outlen,
- ukm, ukmlen);
- if (derlen == 0)
- goto err;
- for (i = 1;;i++)
- {
- unsigned char mtmp[EVP_MAX_MD_SIZE];
- EVP_DigestInit_ex(&mctx, md, NULL);
- if (!EVP_DigestUpdate(&mctx, Z, Zlen))
- goto err;
- ctr[3] = i & 0xFF;
- ctr[2] = (i >> 8) & 0xFF;
- ctr[1] = (i >> 16) & 0xFF;
- ctr[0] = (i >> 24) & 0xFF;
- if (!EVP_DigestUpdate(&mctx, der, derlen))
- goto err;
- if (outlen >= mdlen)
- {
- if (!EVP_DigestFinal(&mctx, out, NULL))
- goto err;
- outlen -= mdlen;
- if (outlen == 0)
- break;
- out += mdlen;
- }
- else
- {
- if (!EVP_DigestFinal(&mctx, mtmp, NULL))
- goto err;
- memcpy(out, mtmp, outlen);
- OPENSSL_cleanse(mtmp, mdlen);
- break;
- }
- }
- rv = 1;
- err:
- if (der)
- OPENSSL_free(der);
- EVP_MD_CTX_cleanup(&mctx);
- return rv;
- }
+ ASN1_OBJECT *key_oid, size_t outlen,
+ const unsigned char *ukm, size_t ukmlen)
+{
+ unsigned char *p;
+ int derlen;
+ long tlen;
+ /* "magic" value to check offset is sane */
+ static unsigned char ctr[4] = { 0xF3, 0x17, 0x22, 0x53 };
+ X509_ALGOR atmp;
+ ASN1_OCTET_STRING ctr_oct, ukm_oct, *pukm_oct;
+ ASN1_TYPE ctr_atype;
+ if (ukmlen > DH_KDF_MAX || outlen > DH_KDF_MAX)
+ return 0;
+ ctr_oct.data = ctr;
+ ctr_oct.length = 4;
+ ctr_oct.flags = 0;
+ ctr_oct.type = V_ASN1_OCTET_STRING;
+ ctr_atype.type = V_ASN1_OCTET_STRING;
+ ctr_atype.value.octet_string = &ctr_oct;
+ atmp.algorithm = key_oid;
+ atmp.parameter = &ctr_atype;
+ if (ukm) {
+ ukm_oct.type = V_ASN1_OCTET_STRING;
+ ukm_oct.flags = 0;
+ ukm_oct.data = (unsigned char *)ukm;
+ ukm_oct.length = ukmlen;
+ pukm_oct = &ukm_oct;
+ } else
+ pukm_oct = NULL;
+ derlen = CMS_SharedInfo_encode(pder, &atmp, pukm_oct, outlen);
+ if (derlen <= 0)
+ return 0;
+ p = *pder;
+ tlen = derlen;
+ if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
+ return 0;
+ if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
+ return 0;
+ if (!skip_asn1(&p, &tlen, V_ASN1_OBJECT))
+ return 0;
+ if (!skip_asn1(&p, &tlen, V_ASN1_OCTET_STRING))
+ return 0;
+ if (CRYPTO_memcmp(p, ctr, 4))
+ return 0;
+ *pctr = p;
+ return derlen;
+}
+int DH_KDF_X9_42(unsigned char *out, size_t outlen,
+ const unsigned char *Z, size_t Zlen,
+ ASN1_OBJECT *key_oid,
+ const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
+{
+ EVP_MD_CTX mctx;
+ int rv = 0;
+ unsigned int i;
+ size_t mdlen;
+ unsigned char *der = NULL, *ctr;
+ int derlen;
+ if (Zlen > DH_KDF_MAX)
+ return 0;
+ mdlen = EVP_MD_size(md);
+ EVP_MD_CTX_init(&mctx);
+ derlen = dh_sharedinfo_encode(&der, &ctr, key_oid, outlen, ukm, ukmlen);
+ if (derlen == 0)
+ goto err;
+ for (i = 1;; i++) {
+ unsigned char mtmp[EVP_MAX_MD_SIZE];
+ EVP_DigestInit_ex(&mctx, md, NULL);
+ if (!EVP_DigestUpdate(&mctx, Z, Zlen))
+ goto err;
+ ctr[3] = i & 0xFF;
+ ctr[2] = (i >> 8) & 0xFF;
+ ctr[1] = (i >> 16) & 0xFF;
+ ctr[0] = (i >> 24) & 0xFF;
+ if (!EVP_DigestUpdate(&mctx, der, derlen))
+ goto err;
+ if (outlen >= mdlen) {
+ if (!EVP_DigestFinal(&mctx, out, NULL))
+ goto err;
+ outlen -= mdlen;
+ if (outlen == 0)
+ break;
+ out += mdlen;
+ } else {
+ if (!EVP_DigestFinal(&mctx, mtmp, NULL))
+ goto err;
+ memcpy(out, mtmp, outlen);
+ OPENSSL_cleanse(mtmp, mdlen);
+ break;
+ }
+ }
+ rv = 1;
+ err:
+ OPENSSL_free(der);
+ EVP_MD_CTX_cleanup(&mctx);
+ return rv;
+}
+#endif
projects / openssl.git / blobdiff