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PO
primarykey
Id
13045182
data
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0
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0
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CommentCount
2
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CreationDate
2012-10-24T08:09:58.340
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0
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2017-04-27T15:26:45.733
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2017-04-27T15:26:45.733
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608639
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1516766
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12153009
PostTypeId
2
Score
16
ViewCount
0
LastEditorDisplayName
text
Body
<p>Here is an example to encrypt and decrypt 128 bytes every call to update for example:</p> <pre><code> int howmany, dec_success, len; const EVP_CIPHER *cipher; switch(key_len) { case 128: cipher = EVP_aes_128_gcm ();break; case 192: cipher = EVP_aes_192_gcm ();break; case 256: cipher = EVP_aes_256_gcm ();break; default:break; } // Encrypt EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new(); EVP_EncryptInit (ctx, cipher, KEY, IV); EVP_EncryptUpdate (ctx, NULL, &howmany, AAD, aad_len); len = 0; while(len <= in_len-128) { EVP_EncryptUpdate (ctx, CIPHERTEXT+len, &howmany, PLAINTEXT+len, 128); len+=128; } EVP_EncryptUpdate (ctx, CIPHERTEXT+len, &howmany, PLAINTEXT+len, in_len - len); EVP_EncryptFinal (ctx, TAG, &howmany); EVP_CIPHER_CTX_ctrl (ctx, EVP_CTRL_GCM_GET_TAG, 16, TAG); EVP_CIPHER_CTX_free(ctx); // Decrypt ctx = EVP_CIPHER_CTX_new(); EVP_DecryptInit (ctx, cipher, KEY, IV); EVP_CIPHER_CTX_ctrl (ctx, EVP_CTRL_GCM_SET_TAG, 16, ref_TAG); EVP_DecryptInit (ctx, NULL, KEY, IV); EVP_DecryptUpdate (ctx, NULL, &howmany, AAD, aad_len); len = 0; while(len <= in_len-128) { EVP_DecryptUpdate (ctx, decrypted_CT+len, &howmany, CIPHERTEXT+len, 128); len+=128; } EVP_DecryptUpdate (ctx, decrypted_CT+len, &howmany, CIPHERTEXT+len, in_len-len); dec_success = EVP_DecryptFinal (ctx, dec_TAG, &howmany); EVP_CIPHER_CTX_free(ctx); </code></pre> <p>In the end you should check that the value of dec_success is 1. If you modify the CIPHERTEXT, before you decrypt it, you should get value of 0.</p>
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1. POOpenSSL C example of AES-GCM using EVP interfaces
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1. USjww
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1. USVlad Krasnov
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1. POOpenSSL C example of AES-GCM using EVP interfaces
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