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75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_CHACHA20POLY1305_MODE
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/**
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Process an entire GCM packet in one call.
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@param key The secret key
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@param keylen The length of the secret key
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@param iv The initialization vector
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@param ivlen The length of the initialization vector
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@param aad The additional authentication data (header)
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@param aadlen The length of the aad
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@param in The plaintext
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@param inlen The length of the plaintext (ciphertext length is the same)
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@param out The ciphertext
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@param tag [out] The MAC tag
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@param taglen [in/out] The MAC tag length
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@param direction Encrypt or Decrypt mode (CHACHA20POLY1305_ENCRYPT or CHACHA20POLY1305_DECRYPT)
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@return CRYPT_OK on success
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*/
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int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
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const unsigned char *iv, unsigned long ivlen,
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const unsigned char *aad, unsigned long aadlen,
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const unsigned char *in, unsigned long inlen,
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unsigned char *out,
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unsigned char *tag, unsigned long *taglen,
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int direction)
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{
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chacha20poly1305_state st;
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int err;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(iv != NULL);
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(tag != NULL);
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if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK) { goto LBL_ERR; }
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if (aad && aadlen > 0) {
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if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK) { goto LBL_ERR; }
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}
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if (direction == CHACHA20POLY1305_ENCRYPT) {
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if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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}
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else if (direction == CHACHA20POLY1305_DECRYPT) {
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if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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}
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else {
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err = CRYPT_INVALID_ARG;
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goto LBL_ERR;
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}
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err = chacha20poly1305_done(&st, tag, taglen);
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(&st, sizeof(chacha20poly1305_state));
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#endif
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return err;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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