My problem is that when I do public encryption, the first time I run the
following piece of code, it works OK, but then when I run the program for
the second time, the EVP_SealInit function fails and returns -1.
I seed the random number generator before calling the following piece of
code.
EVP_CIPHER_CTX ctx; /* the context used for PK encryption */
EVP_CIPHER *cipher_type;
unsigned char **ek;
int *ekl;
unsigned char *iv;
EVP_PKEY **pubk;
int npubk;
int outl; /* length of encrypted data buffer */
RSA *pkey;
/* I load the public key from a file into 'pkey' */
EVP_CIPHER_CTX_init(&ctx);
cipher_type = EVP_bf_cbc();
npubk = 1;
ek = (unsigned char **) malloc (sizeof(unsigned char *) * npubk);
ekl = (int *) malloc (sizeof(int) * npubk);
pubk = (EVP_PKEY **) malloc (sizeof(EVP_PKEY *) * npubk);
pubk[0] = EVP_PKEY_new();
EVP_PKEY_set1_RSA(pubk[0], (RSA*)pub_key);
ek[0] = (unsigned char *) malloc (EVP_PKEY_size(pubk[0]));
iv = (unsigned char *) malloc (sizeof(unsigned char) *
EVP_CIPHER_iv_length(cipher_type));
EVP_SealInit(&ctx, cipher_type, ek, ekl, iv, pubk, npubk);
/* isc_buffer_* functions give a reference to the beggining of some buffer
*/
EVP_SealUpdate(&ctx, isc_buffer_used(buffer), &outl,
isc_buffer_base(source), isc_buffer_usedlength(source));
/* here I move forward the 'used' pointer for the 'buffer' buffer, so now
isc_buffer_used points 'outl' bytes more than before */
isc_buffer_add(buffer, outl);
EVP_SealFinal(&ctx, isc_buffer_used(buffer), &outl);
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