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-rw-r--r--libtomcrypt/src/pk/rsa/rsa_encrypt_key.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c
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+++ b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c
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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+ @file rsa_encrypt_key.c
+ RSA PKCS OAEP encryption, Tom St Denis
+*/
+
+#ifdef MRSA
+
+/**
+ (PKCS #1 v2.0) OAEP pad then encrypt
+ @param in The plaintext
+ @param inlen The length of the plaintext (octets)
+ @param out [out] The ciphertext
+ @param outlen [in/out] The max size and resulting size of the ciphertext
+ @param lparam The system "lparam" for the encryption
+ @param lparamlen The length of lparam (octets)
+ @param prng An active PRNG
+ @param prng_idx The index of the desired prng
+ @param hash_idx The index of the desired hash
+ @param key The RSA key to encrypt to
+ @return CRYPT_OK if successful
+*/
+int rsa_encrypt_key(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen,
+ const unsigned char *lparam, unsigned long lparamlen,
+ prng_state *prng, int prng_idx, int hash_idx, rsa_key *key)
+{
+ unsigned long modulus_bitlen, modulus_bytelen, x;
+ int err;
+
+ LTC_ARGCHK(in != NULL);
+ LTC_ARGCHK(out != NULL);
+ LTC_ARGCHK(outlen != NULL);
+ LTC_ARGCHK(key != NULL);
+
+ /* valid prng and hash ? */
+ if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
+ return err;
+ }
+ if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* get modulus len in bits */
+ modulus_bitlen = mp_count_bits(&(key->N));
+
+ /* outlen must be at least the size of the modulus */
+ modulus_bytelen = mp_unsigned_bin_size(&(key->N));
+ if (modulus_bytelen > *outlen) {
+ return CRYPT_BUFFER_OVERFLOW;
+ }
+
+ /* OAEP pad the key */
+ x = *outlen;
+ if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
+ lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
+ out, &x)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* rsa exptmod the OAEP pad */
+ return rsa_exptmod(out, x, out, outlen, PK_PUBLIC, key);
+}
+
+#endif /* MRSA */
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2005/05/05 14:35:59 $ */