| 1 | /*
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| 2 | * Copyright 2012-2019 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * Simple AES GCM test program, uses the same NIST data used for the FIPS
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| 12 | * self test but uses the application level EVP APIs.
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| 13 | */
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| 14 | #include <stdio.h>
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| 15 | #include <openssl/bio.h>
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| 16 | #include <openssl/evp.h>
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| 17 |
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| 18 | /* AES-GCM test data from NIST public test vectors */
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| 19 |
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| 20 | static const unsigned char gcm_key[] = {
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| 21 | 0xee, 0xbc, 0x1f, 0x57, 0x48, 0x7f, 0x51, 0x92, 0x1c, 0x04, 0x65, 0x66,
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| 22 | 0x5f, 0x8a, 0xe6, 0xd1, 0x65, 0x8b, 0xb2, 0x6d, 0xe6, 0xf8, 0xa0, 0x69,
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| 23 | 0xa3, 0x52, 0x02, 0x93, 0xa5, 0x72, 0x07, 0x8f
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| 24 | };
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| 25 |
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| 26 | static const unsigned char gcm_iv[] = {
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| 27 | 0x99, 0xaa, 0x3e, 0x68, 0xed, 0x81, 0x73, 0xa0, 0xee, 0xd0, 0x66, 0x84
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| 28 | };
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| 29 |
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| 30 | static const unsigned char gcm_pt[] = {
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| 31 | 0xf5, 0x6e, 0x87, 0x05, 0x5b, 0xc3, 0x2d, 0x0e, 0xeb, 0x31, 0xb2, 0xea,
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| 32 | 0xcc, 0x2b, 0xf2, 0xa5
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| 33 | };
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| 34 |
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| 35 | static const unsigned char gcm_aad[] = {
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| 36 | 0x4d, 0x23, 0xc3, 0xce, 0xc3, 0x34, 0xb4, 0x9b, 0xdb, 0x37, 0x0c, 0x43,
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| 37 | 0x7f, 0xec, 0x78, 0xde
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| 38 | };
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| 39 |
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| 40 | static const unsigned char gcm_ct[] = {
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| 41 | 0xf7, 0x26, 0x44, 0x13, 0xa8, 0x4c, 0x0e, 0x7c, 0xd5, 0x36, 0x86, 0x7e,
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| 42 | 0xb9, 0xf2, 0x17, 0x36
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| 43 | };
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| 44 |
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| 45 | static const unsigned char gcm_tag[] = {
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| 46 | 0x67, 0xba, 0x05, 0x10, 0x26, 0x2a, 0xe4, 0x87, 0xd7, 0x37, 0xee, 0x62,
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| 47 | 0x98, 0xf7, 0x7e, 0x0c
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| 48 | };
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| 49 |
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| 50 | void aes_gcm_encrypt(void)
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| 51 | {
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| 52 | EVP_CIPHER_CTX *ctx;
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| 53 | int outlen, tmplen;
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| 54 | unsigned char outbuf[1024];
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| 55 | printf("AES GCM Encrypt:\n");
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| 56 | printf("Plaintext:\n");
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| 57 | BIO_dump_fp(stdout, gcm_pt, sizeof(gcm_pt));
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| 58 | ctx = EVP_CIPHER_CTX_new();
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| 59 | /* Set cipher type and mode */
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| 60 | EVP_EncryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
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| 61 | /* Set IV length if default 96 bits is not appropriate */
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| 62 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, sizeof(gcm_iv), NULL);
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| 63 | /* Initialise key and IV */
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| 64 | EVP_EncryptInit_ex(ctx, NULL, NULL, gcm_key, gcm_iv);
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| 65 | /* Zero or more calls to specify any AAD */
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| 66 | EVP_EncryptUpdate(ctx, NULL, &outlen, gcm_aad, sizeof(gcm_aad));
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| 67 | /* Encrypt plaintext */
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| 68 | EVP_EncryptUpdate(ctx, outbuf, &outlen, gcm_pt, sizeof(gcm_pt));
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| 69 | /* Output encrypted block */
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| 70 | printf("Ciphertext:\n");
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| 71 | BIO_dump_fp(stdout, outbuf, outlen);
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| 72 | /* Finalise: note get no output for GCM */
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| 73 | EVP_EncryptFinal_ex(ctx, outbuf, &outlen);
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| 74 | /* Get tag */
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| 75 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, 16, outbuf);
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| 76 | /* Output tag */
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| 77 | printf("Tag:\n");
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| 78 | BIO_dump_fp(stdout, outbuf, 16);
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| 79 | EVP_CIPHER_CTX_free(ctx);
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| 80 | }
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| 81 |
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| 82 | void aes_gcm_decrypt(void)
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| 83 | {
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| 84 | EVP_CIPHER_CTX *ctx;
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| 85 | int outlen, tmplen, rv;
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| 86 | unsigned char outbuf[1024];
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| 87 | printf("AES GCM Decrypt:\n");
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| 88 | printf("Ciphertext:\n");
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| 89 | BIO_dump_fp(stdout, gcm_ct, sizeof(gcm_ct));
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| 90 | ctx = EVP_CIPHER_CTX_new();
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| 91 | /* Select cipher */
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| 92 | EVP_DecryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
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| 93 | /* Set IV length, omit for 96 bits */
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| 94 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, sizeof(gcm_iv), NULL);
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| 95 | /* Specify key and IV */
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| 96 | EVP_DecryptInit_ex(ctx, NULL, NULL, gcm_key, gcm_iv);
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| 97 | /* Zero or more calls to specify any AAD */
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| 98 | EVP_DecryptUpdate(ctx, NULL, &outlen, gcm_aad, sizeof(gcm_aad));
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| 99 | /* Decrypt plaintext */
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| 100 | EVP_DecryptUpdate(ctx, outbuf, &outlen, gcm_ct, sizeof(gcm_ct));
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| 101 | /* Output decrypted block */
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| 102 | printf("Plaintext:\n");
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| 103 | BIO_dump_fp(stdout, outbuf, outlen);
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| 104 | /* Set expected tag value. */
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| 105 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, sizeof(gcm_tag),
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| 106 | (void *)gcm_tag);
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| 107 | /* Finalise: note get no output for GCM */
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| 108 | rv = EVP_DecryptFinal_ex(ctx, outbuf, &outlen);
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| 109 | /*
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| 110 | * Print out return value. If this is not successful authentication
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| 111 | * failed and plaintext is not trustworthy.
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| 112 | */
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| 113 | printf("Tag Verify %s\n", rv > 0 ? "Successful!" : "Failed!");
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| 114 | EVP_CIPHER_CTX_free(ctx);
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| 115 | }
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| 116 |
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| 117 | int main(int argc, char **argv)
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| 118 | {
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| 119 | aes_gcm_encrypt();
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| 120 | aes_gcm_decrypt();
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| 121 | }
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