1 /* Simple AES GCM test program, uses the same NIST data used for the FIPS
2 * self test but uses the application level EVP APIs.
5 #include <openssl/bio.h>
6 #include <openssl/evp.h>
8 /* AES-GCM test data from NIST public test vectors */
10 static const unsigned char gcm_key[] = {
11 0xee,0xbc,0x1f,0x57,0x48,0x7f,0x51,0x92,0x1c,0x04,0x65,0x66,
12 0x5f,0x8a,0xe6,0xd1,0x65,0x8b,0xb2,0x6d,0xe6,0xf8,0xa0,0x69,
13 0xa3,0x52,0x02,0x93,0xa5,0x72,0x07,0x8f
16 static const unsigned char gcm_iv[] = {
17 0x99,0xaa,0x3e,0x68,0xed,0x81,0x73,0xa0,0xee,0xd0,0x66,0x84
20 static const unsigned char gcm_pt[] = {
21 0xf5,0x6e,0x87,0x05,0x5b,0xc3,0x2d,0x0e,0xeb,0x31,0xb2,0xea,
25 static const unsigned char gcm_aad[] = {
26 0x4d,0x23,0xc3,0xce,0xc3,0x34,0xb4,0x9b,0xdb,0x37,0x0c,0x43,
30 static const unsigned char gcm_ct[] = {
31 0xf7,0x26,0x44,0x13,0xa8,0x4c,0x0e,0x7c,0xd5,0x36,0x86,0x7e,
35 static const unsigned char gcm_tag[] = {
36 0x67,0xba,0x05,0x10,0x26,0x2a,0xe4,0x87,0xd7,0x37,0xee,0x62,
40 void aes_gcm_encrypt(void)
44 unsigned char outbuf[1024];
45 printf("AES GCM Encrypt:\n");
46 printf("Plaintext:\n");
47 BIO_dump_fp(stdout, gcm_pt, sizeof(gcm_pt));
48 ctx = EVP_CIPHER_CTX_new();
49 /* Set cipher type and mode */
50 EVP_EncryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
51 /* Set IV length if default 96 bits is not appropriate */
52 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, sizeof(gcm_iv), NULL);
53 /* Initialise key and IV */
54 EVP_EncryptInit_ex(ctx, NULL, NULL, gcm_key, gcm_iv);
55 /* Zero or more calls to specify any AAD */
56 EVP_EncryptUpdate(ctx, NULL, &outlen, gcm_aad, sizeof(gcm_aad));
57 /* Encrypt plaintext */
58 EVP_EncryptUpdate(ctx, outbuf, &outlen, gcm_pt, sizeof(gcm_pt));
59 /* Output encrypted block */
60 printf("Ciphertext:\n");
61 BIO_dump_fp(stdout, outbuf, outlen);
62 /* Finalise: note get no output for GCM */
63 EVP_EncryptFinal_ex(ctx, outbuf, &outlen);
65 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, outbuf);
68 BIO_dump_fp(stdout, outbuf, 16);
69 EVP_CIPHER_CTX_free(ctx);
72 void aes_gcm_decrypt(void)
75 int outlen, tmplen, rv;
76 unsigned char outbuf[1024];
77 printf("AES GCM Derypt:\n");
78 printf("Ciphertext:\n");
79 BIO_dump_fp(stdout, gcm_ct, sizeof(gcm_ct));
80 ctx = EVP_CIPHER_CTX_new();
82 EVP_DecryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
83 /* Set IV length, omit for 96 bits */
84 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, sizeof(gcm_iv), NULL);
85 /* Specify key and IV */
86 EVP_DecryptInit_ex(ctx, NULL, NULL, gcm_key, gcm_iv);
88 /* Set expected tag value. A restriction in OpenSSL 1.0.1c and earlier
89 * required the tag before any AAD or ciphertext */
90 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, sizeof(gcm_tag), gcm_tag);
92 /* Zero or more calls to specify any AAD */
93 EVP_DecryptUpdate(ctx, NULL, &outlen, gcm_aad, sizeof(gcm_aad));
94 /* Decrypt plaintext */
95 EVP_DecryptUpdate(ctx, outbuf, &outlen, gcm_ct, sizeof(gcm_ct));
96 /* Output decrypted block */
97 printf("Plaintext:\n");
98 BIO_dump_fp(stdout, outbuf, outlen);
99 /* Set expected tag value. Works in OpenSSL 1.0.1d and later */
100 EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, sizeof(gcm_tag), gcm_tag);
101 /* Finalise: note get no output for GCM */
102 rv = EVP_DecryptFinal_ex(ctx, outbuf, &outlen);
103 /* Print out return value. If this is not successful authentication
104 * failed and plaintext is not trustworthy.
106 printf("Tag Verify %s\n", rv > 0 ? "Successful!" : "Failed!");
107 EVP_CIPHER_CTX_free(ctx);
110 int main(int argc, char **argv)