56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#include <openssl/evp.h>
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#include <stdio.h>
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#include <string.h>
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int main() {
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// Key and IV should be appropriately sized for ChaCha20
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unsigned char key[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
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};
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unsigned char iv[] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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};
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// Initialize context
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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if (!ctx) {
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perror("EVP_CIPHER_CTX_new failed");
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return 1;
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}
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// Initialize the ChaCha20 cipher
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if (!EVP_EncryptInit_ex(ctx, EVP_chacha20(), NULL, key, iv)) {
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perror("EVP_EncryptInit_ex failed");
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EVP_CIPHER_CTX_free(ctx);
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return 1;
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}
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// Buffer for the keystream
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unsigned char keystream[1000000];
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memset(keystream, 0, sizeof(keystream));
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for (int i = 0; i < 1000; i++) {
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// Generate keystream
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int len;
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if (!EVP_EncryptUpdate(ctx, keystream, &len, keystream, sizeof keystream)) {
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perror("EVP_EncryptUpdate failed");
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EVP_CIPHER_CTX_free(ctx);
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return 1;
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}
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}
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// Clean up
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EVP_CIPHER_CTX_free(ctx);
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// Print the generated keystream
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for (int i = 0; i < 64; i++) {
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printf("%02x", keystream[i]);
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}
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printf("\n");
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return 0;
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}
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