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-rw-r--r--src/hash.c492
1 files changed, 492 insertions, 0 deletions
diff --git a/src/hash.c b/src/hash.c
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+++ b/src/hash.c
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+/*
+ * hash algorithms used in OAuth
+ *
+ * Copyright 2007-2010 Robin Gareus <robin@gareus.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if USE_BUILTIN_HASH // built-in / AVR -- TODO: check license of sha1.c
+#include <stdio.h>
+#include "oauth.h" // oauth_encode_base64
+#include "xmalloc.h"
+
+#include "sha1.c" // TODO: sha1.h ; Makefile.am: add sha1.c
+
+/* API */
+char *oauth_sign_hmac_sha1_raw (const char *m, const size_t ml, const char *k, const size_t kl) {
+ sha1nfo s;
+ sha1_initHmac(&s, (const uint8_t*) k, kl);
+ sha1_write(&s, m, ml);
+ unsigned char *digest = sha1_resultHmac(&s);
+ return oauth_encode_base64(HASH_LENGTH, digest);
+}
+
+char *oauth_sign_hmac_sha1 (const char *m, const char *k) {
+ return(oauth_sign_hmac_sha1_raw (m, strlen(m), k, strlen(k)));
+}
+
+char *oauth_body_hash_file(char *filename) {
+ FILE *F= fopen(filename, "r");
+ if (!F) return NULL;
+
+ size_t len=0;
+ char fb[BUFSIZ];
+ sha1nfo s;
+ sha1_init(&s);
+
+ while (!feof(F) && (len=fread(fb,sizeof(char),BUFSIZ, F))>0) {
+ sha1_write(&s, fb, len);
+ }
+ fclose(F);
+
+ unsigned char *dgst = xmalloc(HASH_LENGTH*sizeof(char)); // oauth_body_hash_encode frees the digest..
+ memcpy(dgst, sha1_result(&s), HASH_LENGTH);
+ return oauth_body_hash_encode(HASH_LENGTH, dgst);
+}
+
+char *oauth_body_hash_data(size_t length, const char *data) {
+ sha1nfo s;
+ sha1_init(&s);
+ for (;length--;) sha1_writebyte(&s, *data++);
+
+ unsigned char *dgst = xmalloc(HASH_LENGTH*sizeof(char)); // oauth_body_hash_encode frees the digest..
+ memcpy(dgst, sha1_result(&s), HASH_LENGTH);
+ return oauth_body_hash_encode(HASH_LENGTH, dgst);
+}
+
+char *oauth_sign_rsa_sha1 (const char *m, const char *k) {
+ /* NOT RSA/PK11 support */
+ return xstrdup("---RSA/PK11-is-not-supported-by-this-version-of-liboauth---");
+}
+
+int oauth_verify_rsa_sha1 (const char *m, const char *c, const char *sig) {
+ /* NOT RSA/PK11 support */
+ return -1; // mismatch , error
+}
+
+#elif defined (USE_NSS)
+/* use http://www.mozilla.org/projects/security/pki/nss/ for hash/sign */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "xmalloc.h"
+#include "oauth.h" // oauth base64 encode fn's.
+
+// NSS includes
+#include "pk11pub.h"
+#include "nss.h"
+#include "base64.h"
+#include "keyhi.h"
+#include "cryptohi.h"
+#include "cert.h"
+
+#if 1 // work-around compiler-warning
+ // see http://bugzilla.mozilla.org/show_bug.cgi?id=243245#c3
+ extern CERTCertificate *
+ __CERT_DecodeDERCertificate (SECItem *derSignedCert, PRBool copyDER, char *nickname);
+#endif
+
+static const char NS_CERT_HEADER[] = "-----BEGIN CERTIFICATE-----";
+static const char NS_CERT_TRAILER[] = "-----END CERTIFICATE-----";
+static const char NS_PRIV_HEADER[] = "-----BEGIN PRIVATE KEY-----";
+static const char NS_PRIV_TRAILER[] = "-----END PRIVATE KEY-----";
+
+void oauth_init_nss() {
+ static short nss_initialized = 0;
+ if (!nss_initialized) { NSS_NoDB_Init(NULL); nss_initialized=1;}
+}
+
+/**
+ * Removes heading & trailing strings; used only internally.
+ * similar to NSS-source/nss/lib/pkcs7/certread.c
+ *
+ * the returned string (if not NULL) needs to be freed by the caller
+ */
+char *oauth_strip_pkcs(const char *txt, const char *h, const char *t) {
+ char *start, *end, *rv;
+ size_t len;
+ if ((start=strstr(txt, h))==NULL) return NULL;
+ start+=strlen(h);
+ while (*start=='\r' || *start=='\n') start++;
+ if ((end=strstr(start, t))==NULL) return NULL;
+ end--;
+ while (*end=='\r' || *end=='\n') end--;
+ len = end-start+2;
+ rv = xmalloc(len*sizeof(char));
+ memcpy(rv,start,len);
+ rv[len-1]='\0';
+ return rv;
+}
+
+char *oauth_sign_hmac_sha1 (const char *m, const char *k) {
+ return(oauth_sign_hmac_sha1_raw (m, strlen(m), k, strlen(k)));
+}
+
+char *oauth_sign_hmac_sha1_raw (const char *m, const size_t ml, const char *k, const size_t kl) {
+ PK11SlotInfo *slot = NULL;
+ PK11SymKey *pkey = NULL;
+ PK11Context *context = NULL;
+ unsigned char digest[20]; // Is there a way to tell how large the output is?
+ unsigned int len;
+ SECStatus s;
+ SECItem keyItem, noParams;
+ char *rv=NULL;
+
+ keyItem.type = siBuffer;
+ keyItem.data = (unsigned char*) k;
+ keyItem.len = kl;
+
+ noParams.type = siBuffer;
+ noParams.data = NULL;
+ noParams.len = 0;
+
+ oauth_init_nss();
+
+ slot = PK11_GetInternalKeySlot();
+ if (!slot) goto looser;
+ pkey = PK11_ImportSymKey(slot, CKM_SHA_1_HMAC, PK11_OriginUnwrap, CKA_SIGN, &keyItem, NULL);
+ if (!pkey) goto looser;
+ context = PK11_CreateContextBySymKey(CKM_SHA_1_HMAC, CKA_SIGN, pkey, &noParams);
+ if (!context) goto looser;
+
+ s = PK11_DigestBegin(context);
+ if (s != SECSuccess) goto looser;
+ s = PK11_DigestOp(context, (unsigned char*) m, ml);
+ if (s != SECSuccess) goto looser;
+ s = PK11_DigestFinal(context, digest, &len, sizeof digest);
+ if (s != SECSuccess) goto looser;
+
+ rv=oauth_encode_base64(len, digest);
+
+looser:
+ if (context) PK11_DestroyContext(context, PR_TRUE);
+ if (pkey) PK11_FreeSymKey(pkey);
+ if (slot) PK11_FreeSlot(slot);
+ return rv;
+}
+
+char *oauth_sign_rsa_sha1 (const char *m, const char *k) {
+ PK11SlotInfo *slot = NULL;
+ SECKEYPrivateKey *pkey = NULL;
+ SECItem signature;
+ SECStatus s;
+ SECItem der;
+ char *rv=NULL;
+
+ char *key = oauth_strip_pkcs(k, NS_PRIV_HEADER, NS_PRIV_TRAILER);
+ if (!key) return NULL;
+
+ oauth_init_nss();
+
+ slot = PK11_GetInternalKeySlot();
+ if (!slot) goto looser;
+ s = ATOB_ConvertAsciiToItem(&der, key);
+ if (s != SECSuccess) goto looser;
+ s = PK11_ImportDERPrivateKeyInfoAndReturnKey(slot, &der, NULL, NULL, PR_FALSE, PR_TRUE, KU_ALL, &pkey, NULL);
+ SECITEM_FreeItem(&der, PR_FALSE);
+ if (s != SECSuccess) goto looser;
+ if (!pkey) goto looser;
+ if (pkey->keyType != rsaKey) goto looser;
+ s = SEC_SignData(&signature, (unsigned char*) m, strlen(m), pkey, SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE);
+ if (s != SECSuccess) goto looser;
+
+ rv=oauth_encode_base64(signature.len, signature.data);
+ SECITEM_FreeItem(&signature, PR_FALSE);
+
+looser:
+ if (pkey) SECKEY_DestroyPrivateKey(pkey);
+ if (slot) PK11_FreeSlot(slot);
+ free(key);
+ return rv;
+}
+
+int oauth_verify_rsa_sha1 (const char *m, const char *c, const char *sig) {
+ PK11SlotInfo *slot = NULL;
+ SECKEYPublicKey *pkey = NULL;
+ CERTCertificate *cert = NULL;
+ SECItem signature;
+ SECStatus s;
+ SECItem der;
+ int rv=0;
+
+ char *key = oauth_strip_pkcs(c, NS_CERT_HEADER, NS_CERT_TRAILER);
+ if (!key) return 0;
+
+ oauth_init_nss();
+
+ s = ATOB_ConvertAsciiToItem(&signature, (char*) sig); // XXX cast (const char*) -> (char*)
+ if (s != SECSuccess) goto looser;
+ slot = PK11_GetInternalKeySlot();
+ if (!slot) goto looser;
+ s = ATOB_ConvertAsciiToItem(&der, key);
+ if (s != SECSuccess) goto looser;
+ cert = __CERT_DecodeDERCertificate(&der, PR_TRUE, NULL);
+ SECITEM_FreeItem(&der, PR_FALSE);
+ if (!cert) goto looser;
+ pkey = CERT_ExtractPublicKey(cert);
+ if (!pkey) goto looser;
+ if (pkey->keyType != rsaKey) goto looser;
+
+ s = VFY_VerifyData((unsigned char*) m, strlen(m), pkey, &signature, SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, NULL);
+ if (s == SECSuccess) rv=1;
+#if 0
+ else if (PR_GetError()!= SEC_ERROR_BAD_SIGNATURE) rv=-1;
+#endif
+
+looser:
+ if (pkey) SECKEY_DestroyPublicKey(pkey);
+ if (slot) PK11_FreeSlot(slot);
+ free(key);
+ return rv;
+}
+
+char *oauth_body_hash_file(char *filename) {
+ PK11SlotInfo *slot = NULL;
+ PK11Context *context = NULL;
+ unsigned char digest[20]; // Is there a way to tell how large the output is?
+ unsigned int len;
+ SECStatus s;
+ char *rv=NULL;
+ size_t bl;
+ unsigned char fb[BUFSIZ];
+
+ FILE *F= fopen(filename, "r");
+ if (!F) return NULL;
+
+ oauth_init_nss();
+
+ slot = PK11_GetInternalKeySlot();
+ if (!slot) goto looser;
+ context = PK11_CreateDigestContext(SEC_OID_SHA1);
+ if (!context) goto looser;
+
+ s = PK11_DigestBegin(context);
+ if (s != SECSuccess) goto looser;
+ while (!feof(F) && (bl=fread(fb,sizeof(char),BUFSIZ, F))>0) {
+ s = PK11_DigestOp(context, (unsigned char*) fb, bl);
+ if (s != SECSuccess) goto looser;
+ }
+ s = PK11_DigestFinal(context, digest, &len, sizeof digest);
+ if (s != SECSuccess) goto looser;
+
+ unsigned char *dgst = xmalloc(len*sizeof(char)); // oauth_body_hash_encode frees the digest..
+ memcpy(dgst, digest, len);
+ rv=oauth_body_hash_encode(len, dgst);
+
+looser:
+ fclose(F);
+ if (context) PK11_DestroyContext(context, PR_TRUE);
+ if (slot) PK11_FreeSlot(slot);
+ return rv;
+}
+
+char *oauth_body_hash_data(size_t length, const char *data) {
+ PK11SlotInfo *slot = NULL;
+ PK11Context *context = NULL;
+ unsigned char digest[20]; // Is there a way to tell how large the output is?
+ unsigned int len;
+ SECStatus s;
+ char *rv=NULL;
+
+ oauth_init_nss();
+
+ slot = PK11_GetInternalKeySlot();
+ if (!slot) goto looser;
+ context = PK11_CreateDigestContext(SEC_OID_SHA1);
+ if (!context) goto looser;
+
+ s = PK11_DigestBegin(context);
+ if (s != SECSuccess) goto looser;
+ s = PK11_DigestOp(context, (unsigned char*) data, length);
+ if (s != SECSuccess) goto looser;
+ s = PK11_DigestFinal(context, digest, &len, sizeof digest);
+ if (s != SECSuccess) goto looser;
+
+ unsigned char *dgst = xmalloc(len*sizeof(char)); // oauth_body_hash_encode frees the digest..
+ memcpy(dgst, digest, len);
+ rv=oauth_body_hash_encode(len, dgst);
+
+looser:
+ if (context) PK11_DestroyContext(context, PR_TRUE);
+ if (slot) PK11_FreeSlot(slot);
+ return rv;
+}
+
+#else
+/* use http://www.openssl.org/ for hash/sign */
+
+#ifdef _GNU_SOURCE
+/*
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "xmalloc.h"
+#include "oauth.h" // base64 encode fn's.
+#include <openssl/hmac.h>
+
+char *oauth_sign_hmac_sha1 (const char *m, const char *k) {
+ return(oauth_sign_hmac_sha1_raw (m, strlen(m), k, strlen(k)));
+}
+
+char *oauth_sign_hmac_sha1_raw (const char *m, const size_t ml, const char *k, const size_t kl) {
+ unsigned char result[EVP_MAX_MD_SIZE];
+ unsigned int resultlen = 0;
+
+ HMAC(EVP_sha1(), k, kl,
+ (unsigned char*) m, ml,
+ result, &resultlen);
+
+ return(oauth_encode_base64(resultlen, result));
+}
+
+#include <openssl/evp.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/ssl.h>
+
+char *oauth_sign_rsa_sha1 (const char *m, const char *k) {
+ unsigned char *sig = NULL;
+ unsigned char *passphrase = NULL;
+ unsigned int len=0;
+ EVP_MD_CTX md_ctx;
+
+ EVP_PKEY *pkey;
+ BIO *in;
+ in = BIO_new_mem_buf((unsigned char*) k, strlen(k));
+ pkey = PEM_read_bio_PrivateKey(in, NULL, 0, passphrase); // generate sign
+ BIO_free(in);
+
+ if (pkey == NULL) {
+ //fprintf(stderr, "liboauth/OpenSSL: can not read private key\n");
+ return xstrdup("liboauth/OpenSSL: can not read private key");
+ }
+
+ len = EVP_PKEY_size(pkey);
+ sig = (unsigned char*)xmalloc((len+1)*sizeof(char));
+
+ EVP_SignInit(&md_ctx, EVP_sha1());
+ EVP_SignUpdate(&md_ctx, m, strlen(m));
+ if (EVP_SignFinal (&md_ctx, sig, &len, pkey)) {
+ char *tmp;
+ sig[len] = '\0';
+ tmp = oauth_encode_base64(len,sig);
+ OPENSSL_free(sig);
+ EVP_PKEY_free(pkey);
+ return tmp;
+ }
+ return xstrdup("liboauth/OpenSSL: rsa-sha1 signing failed");
+}
+
+int oauth_verify_rsa_sha1 (const char *m, const char *c, const char *s) {
+ EVP_MD_CTX md_ctx;
+ EVP_PKEY *pkey;
+ BIO *in;
+ X509 *cert = NULL;
+ unsigned char *b64d;
+ int slen, err;
+
+ in = BIO_new_mem_buf((unsigned char*)c, strlen(c));
+ cert = PEM_read_bio_X509(in, NULL, 0, NULL);
+ if (cert) {
+ pkey = (EVP_PKEY *) X509_get_pubkey(cert);
+ X509_free(cert);
+ } else {
+ pkey = PEM_read_bio_PUBKEY(in, NULL, 0, NULL);
+ }
+ BIO_free(in);
+ if (pkey == NULL) {
+ //fprintf(stderr, "could not read cert/pubkey.\n");
+ return -2;
+ }
+
+ b64d= (unsigned char*) xmalloc(sizeof(char)*strlen(s));
+ slen = oauth_decode_base64(b64d, s);
+
+ EVP_VerifyInit(&md_ctx, EVP_sha1());
+ EVP_VerifyUpdate(&md_ctx, m, strlen(m));
+ err = EVP_VerifyFinal(&md_ctx, b64d, slen, pkey);
+ EVP_MD_CTX_cleanup(&md_ctx);
+ EVP_PKEY_free(pkey);
+ free(b64d);
+ return (err);
+}
+
+
+/**
+ * http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html
+ */
+char *oauth_body_hash_file(char *filename) {
+ unsigned char fb[BUFSIZ];
+ EVP_MD_CTX ctx;
+ size_t len=0;
+ unsigned char *md;
+ FILE *F= fopen(filename, "r");
+ if (!F) return NULL;
+
+ EVP_MD_CTX_init(&ctx);
+ EVP_DigestInit(&ctx,EVP_sha1());
+ while (!feof(F) && (len=fread(fb,sizeof(char),BUFSIZ, F))>0) {
+ EVP_DigestUpdate(&ctx, fb, len);
+ }
+ fclose(F);
+ len=0;
+ md=(unsigned char*) xcalloc(EVP_MD_size(EVP_sha1()),sizeof(unsigned char));
+ EVP_DigestFinal(&ctx, md,(unsigned int*) &len);
+ EVP_MD_CTX_cleanup(&ctx);
+ return oauth_body_hash_encode(len, md);
+}
+
+char *oauth_body_hash_data(size_t length, const char *data) {
+ EVP_MD_CTX ctx;
+ size_t len=0;
+ unsigned char *md;
+ md=(unsigned char*) xcalloc(EVP_MD_size(EVP_sha1()),sizeof(unsigned char));
+ EVP_MD_CTX_init(&ctx);
+ EVP_DigestInit(&ctx,EVP_sha1());
+ EVP_DigestUpdate(&ctx, data, length);
+ EVP_DigestFinal(&ctx, md,(unsigned int*) &len);
+ EVP_MD_CTX_cleanup(&ctx);
+ return oauth_body_hash_encode(len, md);
+}
+
+#endif
+
+// vi: sts=2 sw=2 ts=2
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