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-rw-r--r--src/lib/hmacsha1.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/src/lib/hmacsha1.c b/src/lib/hmacsha1.c
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+++ b/src/lib/hmacsha1.c
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+/*
+ * Adapted from hmac.c (HMAC-MD5) for use by SHA1.
+ * by <mcr@sandelman.ottawa.on.ca>. Test cases from RFC2202.
+ *
+ */
+
+/*
+** Function: hmac_sha1
+*/
+
+RCSID("$Id$")
+
+#ifdef HAVE_OPENSSL_EVP_H
+#include <openssl/hmac.h>
+#include <openssl/evp.h>
+#include <freeradius-devel/openssl3.h>
+#endif
+
+#include <freeradius-devel/libradius.h>
+
+#ifdef HMAC_SHA1_DATA_PROBLEMS
+unsigned int sha1_data_problems = 0;
+#endif
+
+#ifdef HAVE_OPENSSL_EVP_H
+/** Calculate HMAC using OpenSSL's SHA1 implementation
+ *
+ * @param digest Caller digest to be filled in.
+ * @param text Pointer to data stream.
+ * @param text_len length of data stream.
+ * @param key Pointer to authentication key.
+ * @param key_len Length of authentication key.
+
+ */
+void fr_hmac_sha1(uint8_t digest[SHA1_DIGEST_LENGTH], uint8_t const *text, size_t text_len,
+ uint8_t const *key, size_t key_len)
+{
+ HMAC_CTX *ctx = HMAC_CTX_new();
+ unsigned int len = SHA1_DIGEST_LENGTH;
+
+ HMAC_Init_ex(ctx, key, key_len, EVP_sha1(), NULL);
+ HMAC_Update(ctx, text, text_len);
+ HMAC_Final(ctx, digest, &len);
+ HMAC_CTX_free(ctx);
+}
+
+#else
+
+/** Calculate HMAC using internal SHA1 implementation
+ *
+ * @param digest Caller digest to be filled in.
+ * @param text Pointer to data stream.
+ * @param text_len length of data stream.
+ * @param key Pointer to authentication key.
+ * @param key_len Length of authentication key.
+ */
+void fr_hmac_sha1(uint8_t digest[SHA1_DIGEST_LENGTH], uint8_t const *text, size_t text_len,
+ uint8_t const *key, size_t key_len)
+{
+ fr_sha1_ctx context;
+ uint8_t k_ipad[65]; /* inner padding - key XORd with ipad */
+ uint8_t k_opad[65]; /* outer padding - key XORd with opad */
+ uint8_t tk[20];
+ int i;
+ /* if key is longer than 64 bytes reset it to key=SHA1(key) */
+ if (key_len > 64) {
+
+ fr_sha1_ctx tctx;
+
+ fr_sha1_init(&tctx);
+ fr_sha1_update(&tctx, key, key_len);
+ fr_sha1_final(tk, &tctx);
+
+ key = tk;
+ key_len = 20;
+ }
+
+#ifdef HMAC_SHA1_DATA_PROBLEMS
+ if(sha1_data_problems)
+ {
+ int j,k;
+
+ printf("\nhmac-sha1 key(%d): ", key_len);
+ j=0; k=0;
+ for (i = 0; i < key_len; i++) {
+ if(j==4) {
+ printf("_");
+ j=0;
+ }
+ j++;
+
+ printf("%02x", key[i]);
+ }
+ printf("\nDATA: (%d) ",text_len);
+
+ j=0; k=0;
+ for (i = 0; i < text_len; i++) {
+ if(k==20) {
+ printf("\n ");
+ k=0;
+ j=0;
+ }
+ if(j==4) {
+ printf("_");
+ j=0;
+ }
+ k++;
+ j++;
+
+ printf("%02x", text[i]);
+ }
+ printf("\n");
+ }
+#endif
+
+
+ /*
+ * the HMAC_SHA1 transform looks like:
+ *
+ * SHA1(K XOR opad, SHA1(K XOR ipad, text))
+ *
+ * where K is an n byte key
+ * ipad is the byte 0x36 repeated 64 times
+
+ * opad is the byte 0x5c repeated 64 times
+ * and text is the data being protected
+ */
+
+ /* start out by storing key in pads */
+ memset(k_ipad, 0, sizeof(k_ipad));
+ memset(k_opad, 0, sizeof(k_opad));
+ memcpy(k_ipad, key, key_len);
+ memcpy(k_opad, key, key_len);
+
+ /* XOR key with ipad and opad values */
+ for (i = 0; i < 64; i++) {
+ k_ipad[i] ^= 0x36;
+ k_opad[i] ^= 0x5c;
+ }
+ /*
+ * perform inner SHA1
+ */
+ fr_sha1_init(&context); /* init context for 1st pass */
+ fr_sha1_update(&context, k_ipad, 64); /* start with inner pad */
+ fr_sha1_update(&context, text, text_len); /* then text of datagram */
+ fr_sha1_final(digest, &context); /* finish up 1st pass */
+ /*
+ * perform outer SHA1
+ */
+ fr_sha1_init(&context); /* init context for 2nd pass */
+ fr_sha1_update(&context, k_opad, 64); /* start with outer pad */
+ fr_sha1_update(&context, digest, 20); /* then results of 1st hash */
+ fr_sha1_final(digest, &context); /* finish up 2nd pass */
+
+#ifdef HMAC_SHA1_DATA_PROBLEMS
+ if (sha1_data_problems) {
+ int j;
+
+ printf("\nhmac-sha1 mac(20): ");
+ j=0;
+ for (i = 0; i < 20; i++) {
+ if(j==4) {
+ printf("_");
+ j=0;
+ }
+ j++;
+
+ printf("%02x", digest[i]);
+ }
+ printf("\n");
+ }
+#endif
+}
+#endif /* HAVE_OPENSSL_EVP_H */
+
+/*
+Test Vectors (Trailing '\0' of a character string not included in test):
+
+ key = "Jefe"
+ data = "what do ya want for nothing?"
+ data_len = 28 bytes
+ digest = effcdf6ae5eb2fa2d27416d5f184df9c259a7c79
+
+ key = 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+
+ key_len 16 bytes
+ data = 0xDDDDDDDDDDDDDDDDDDDD...
+ ..DDDDDDDDDDDDDDDDDDDD...
+ ..DDDDDDDDDDDDDDDDDDDD...
+ ..DDDDDDDDDDDDDDDDDDDD...
+ ..DDDDDDDDDDDDDDDDDDDD
+ data_len = 50 bytes
+ digest = 0x56be34521d144c88dbb8c733f0e8b3f6
+*/
+
+#ifdef TESTING
+/*
+ * cc -DTESTING -I ../include/ hmac.c sha1.c -o hmac
+ *
+ * ./hmac Jefe "what do ya want for nothing?"
+ */
+int main(int argc, char **argv)
+{
+ uint8_t digest[20];
+ char *key;
+ int key_len;
+ char *text;
+ int text_len;
+ int i;
+
+ key = argv[1];
+ key_len = strlen(key);
+
+ text = argv[2];
+ text_len = strlen(text);
+
+ fr_hmac_sha1(digest, text, text_len, key, key_len);
+
+ for (i = 0; i < 20; i++) {
+ printf("%02x", digest[i]);
+ }
+ printf("\n");
+
+ exit(0);
+ return 0;
+}
+
+#endif